German and Czech "Gateway" Sites Simulcasting Same Signal Multiple Frequencies

[R4002]

Hearing the same QSO on the following frequencies at the exact same time via the excellent G8JNJ SDR online receiver. 

1900 UTC
3 July 2024

26935 FM - 26.935 MHz FM - Channel 78 - Kanal 78
26865 FM - 26.865 MHz FM - Channel 71 - Kanal 71 - designated as an Internet gateways channel
26855 FM - 26.855 MHz FM - Channel 70 - Kanal 70
26845 FM - 26.845 MHz FM - Channel 69 - Kanal 69
26835 FM - 26.835 MHz FM - Channel 68 - Kanal 68 - unofficially, this is very popular as a gateway / online radio network access freq
26815 FM - 26.815 MHz FM - Channel 66 - Kanal 66
26765 FM - 26.765 MHz FM - Channel 61 - Kanal 61 - designated as an Internet gateways channel
26755 FM - 26.755 MHz FM - Channel 60 - Kanal 60 - designated as an Internet gateways channel
26705 FM - 26.705 MHz FM - Channel 55 - Kanal 55

I know there are a lot of remote sites on this system.  Most, if not all of them, use CTCSS tone squelch (PL).  67.0 Hz, 77.0 Hz, 85.4 Hz, 88.5 Hz, 94.8 Hz, 100.0 Hz and 103.5 Hz are all known to be in use.  I believe there is some use of DCS (DTCS or DPL) as well. 


At 1905 UTC, 26.835 and 26.935 are the strongest.  5 minutes before, 26,835 MHz FM and 26,855 MHz FM were the two strongest by a significant margin. 

At 1906 UTC, 26.855 MHz started suffering from severe QRM, in both AM mode and FM mode.  26.855 MHz AM consisted of Italian language chatter.  Very strong signals at 1906 UTC - 1907 UTC.