Setup: Radio 6400M with 184.108.40.206 firmware running on front panel control, attempts to tune in SSB or DIGx modes fails.
Current operation: So pressing the TUNE button does not function. 60m in the UK and the US is channelized, so as of this firmware release, operating the TUNE button generates a signal on the carrier which will result in RF energy outside of the channel, which is not allowed.
Suggested operation: Change the TUNE button logic in this situation to use the CW tune function "under the covers" to provide tuning power for the SSB / DIGx operator.
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