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		<id>https://hfunderground.com/wiki/index.php?action=history&amp;feed=atom&amp;title=Radio_propagation_beacon</id>
		<title>Radio propagation beacon - Revision history</title>
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		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;action=history"/>
		<updated>2026-10-21T19:38:06Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14902&amp;oldid=prev</id>
		<title>R4002: /* See also */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14902&amp;oldid=prev"/>
				<updated>2023-03-24T14:09:09Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;See also&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:09, 24 March 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 504:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 504:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons|Part 15 Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons|Part 15 Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band 27 MHz CB radio band beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band 27 MHz CB radio band beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[HF_pagers|Pagers and data links]] as well [[High power RC systems&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|Remote_Control&lt;/del&gt;]] - de facto 11 meter beacons&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[HF_pagers|Pagers and data links]] as well [[&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Remote_Control|&lt;/ins&gt;High power RC systems]] - de facto 11 meter beacons&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14901&amp;oldid=prev</id>
		<title>R4002: /* See also */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14901&amp;oldid=prev"/>
				<updated>2023-03-24T14:08:46Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;See also&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:08, 24 March 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 503:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 503:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons|Part 15 Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons|Part 15 Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band CB radio band &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;27 MHz &lt;/del&gt;beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;27 MHz &lt;/ins&gt;CB radio band beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;nbsp;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;* [[HF_pagers|Pagers and data links]] as well [[High power RC systems|Remote_Control]] - de facto 11 meter beacons&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14900&amp;oldid=prev</id>
		<title>R4002: /* See also */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14900&amp;oldid=prev"/>
				<updated>2023-03-24T14:06:29Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;See also&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:06, 24 March 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 502:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 502:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Letter beacon]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Letter beacon]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;|Part 15 Beacons&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band CB radio band 27 MHz beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band CB radio band 27 MHz beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14899&amp;oldid=prev</id>
		<title>R4002: /* See also */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14899&amp;oldid=prev"/>
				<updated>2023-03-24T14:06:07Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;See also&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:06, 24 March 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 503:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 503:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[High Frequency Beacon]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* [[Part_15_Beacons]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;nbsp;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;color: red; font-weight: bold; text-decoration: none;&quot;&gt;* [[11_meter#11_meter_Beacon_Frequencies_11m_CB_Beacon_Channels_11m_Beacon_Bands|11 meter band CB radio band 27 MHz beacons]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==Notes and references==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14771&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14771&amp;oldid=prev"/>
				<updated>2023-02-08T12:46:04Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 12:46, 8 February 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system on 40 MHz operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[[SINCGARS#Federal_Government_and_Military_Only_Bands_30-50_MHz|&lt;/ins&gt;on 40 MHz&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]] &lt;/ins&gt;operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian [[SINCGARS#Confirmed_30-88_MHz_and_30-50_MHz_FM_Military_Frequencies_In_Use_North_America_USA|military]] base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS|military]] VHF FM radio beacon transmitting continuously with a CW ID / a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian [[SINCGARS#Confirmed_30-88_MHz_and_30-50_MHz_FM_Military_Frequencies_In_Use_North_America_USA|military]] base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS|military]] VHF FM radio beacon transmitting continuously with a CW ID / a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14770&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14770&amp;oldid=prev"/>
				<updated>2023-02-08T12:45:09Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 12:45, 8 February 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 91:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 91:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system on 40 MHz operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system on 40 MHz operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS|military]] VHF FM radio beacon transmitting continuously with a CW ID / a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[[SINCGARS#Confirmed_30-88_MHz_and_30-50_MHz_FM_Military_Frequencies_In_Use_North_America_USA|&lt;/ins&gt;military&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]] &lt;/ins&gt;base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS|military]] VHF FM radio beacon transmitting continuously with a CW ID / a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14767&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14767&amp;oldid=prev"/>
				<updated>2023-02-08T12:35:20Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 12:35, 8 February 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;on 40 MHz &lt;/ins&gt;operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|&lt;/del&gt;|military]] VHF FM radio beacon transmitting a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode [[SINCGARS|military]] VHF FM radio beacon transmitting &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;continuously with a CW ID / &lt;/ins&gt;a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14733&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14733&amp;oldid=prev"/>
				<updated>2023-01-21T14:18:08Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:18, 21 January 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 91:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 91:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz, 40.67 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode military VHF FM radio beacon transmitting a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[[SINCGARS||&lt;/ins&gt;military&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]] &lt;/ins&gt;VHF FM radio beacon transmitting a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14732&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=14732&amp;oldid=prev"/>
				<updated>2023-01-21T14:14:25Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
			&lt;col class='diff-content' /&gt;
		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 14:14, 21 January 2023&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 90:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; (40.071 MHz). Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz (40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters).&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;MHz, 40.67 &lt;/ins&gt;MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;nbsp;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;* The Canadian military base Shuffield (CYSD) in Alberta operates a FM mode military VHF FM radio beacon transmitting a Morse code ID '''YSD''' followed by a tone burst on 36.6 FM (36600 kHz FM, 36.600 MHz FM, 36.60 FM, 36.6 MHz)&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==6 meters (50 MHz) beacons==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

	<entry>
		<id>https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=9113&amp;oldid=prev</id>
		<title>R4002: /* 40 MHz beacons */</title>
		<link rel="alternate" type="text/html" href="https://hfunderground.com/wiki/index.php?title=Radio_propagation_beacon&amp;diff=9113&amp;oldid=prev"/>
				<updated>2019-06-11T13:29:07Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;40 MHz beacons&lt;/span&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: white; color:black;&quot;&gt;
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			&lt;col class='diff-content' /&gt;
			&lt;col class='diff-marker' /&gt;
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		&lt;tr valign='top'&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;← Older revision&lt;/td&gt;
		&lt;td colspan='2' style=&quot;background-color: white; color:black;&quot;&gt;Revision as of 13:29, 11 June 2019&lt;/td&gt;
		&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 88:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 88:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==40 MHz beacons==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;==40 MHz beacons==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt;. Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The first radio propagation beacon on 40 MHz is OZ7IGY in Jystrup, Denmark (JO55WM) and transmits on 40071&amp;amp;nbsp;kHz &amp;lt;s&amp;gt;40021 kHz&amp;lt;/s&amp;gt; &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;(40.071 MHz)&lt;/ins&gt;. Transmitted power is&amp;nbsp; 20 W to a dipole antenna. &amp;lt;!-- Modulation is F1A keying (frequency Shift Keying), with a shift of 250 Hz. [http://www.oz7igy.dk/] --&amp;gt; The beacon is frequency- and time-locked to GPS. The sequence is programmed to send PI4 , followed by a short pause, and then the call sign and grid locator sent in CW, then a pause, and a carrier until start of the next cycle. PI4 is a digital mode specifically designed for beacons and propagation studies, similar to JT4 and WSPR. To decode PI4, tune 800 Hz below the nominal frequency.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;-&lt;/td&gt;&lt;td style=&quot;background: #ffa; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;background: #cfc; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* The [[Radio Society of Great Britain]] has a license for beacon transmissions from GB3RAL (Didcot, UK) on 40050 &amp;amp; 60050&amp;amp;nbsp;kHz &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;(40.050 MHz &amp;amp; 60.050 MHz - 8 meters and 5 meters)&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;div&gt;* While not a beacon by design, the US Government's SNOTEL telemetry system operates more than 600 transmitters (mostly in the Rocky Mountain and Western United States regions) on 40670 kHz (40.670 MHz).&amp;nbsp; During sporadic-E band openings, data bursts from the SNOTEL system can be heard on 40.67 MHz.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt; &lt;/td&gt;&lt;td style=&quot;background: #eee; color:black; font-size: smaller;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>R4002</name></author>	</entry>

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