Many European stations run multiple modes as well as additional packet ’channels’ for BBS interlinks etc, these can be found only on the USB frequency as the multi modes such as VARA, ARDOP, PACTOR and Robust Packet are sideband sensitive and sit at a fixed center frequency of 1500hz.
7.0452 USB (updated August 2023)
The USB dial frequency of 7.0452 has been selected to keep the setup intact according to the 20m setup, some of the stations switch from 20m to 40m during the evening when propagation on 20m becomes difficult. The 40m frequency shown here is within the EU digital mode allocation, the US allocation is unfortunately incompatible because it is much higher up the band, you may find Net40 on 7.104 LSB (AX25 300 baud at 1700Hz center frequency).
You may want to try running QtSoundModem as it helps to visualise the spectrum with a waterfall.
The 20 meter Frequency
Please note these are subject to change as we are in the process of testing viability of various new packet modes, on paper they appear to be 200Hz wide but in reality packet AFSK is actually closers to 400Hz, and BPSK / QPSK is ~450Hz. At present, AFSK 300 IL2P at 2250Hz does overlap with AFSK.FX25 at 2000Hz but it remains working for now.
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