[Elecraft] K3 and PSK31 Data Mode and ESSB

[Dave G4AON]

Bill, testing on PSK31 TX, using USB and ESSB set to 4 KHz, centre freq
at 1500 Hz (normal K3 DSP setting)... I can obtain full power from 300
Hz to 3500 Hz on the waterfall, the power drops off abruptly above 3500
Hz. By moving the centre frequency to 2000 Hz I can transmit up to 3700 Hz.

On Data A, the upper limit is 2900 Hz, I don't think ESSB works on Data
A. Although the menu suggests it is turned on, there is no "+" on the
LCD display.

The advantage of using Data A (as opposed to SSB) is that you
automatically select the appropriate mic or line input, per mode. Maybe
wider data modes could be incorporated in a firmware update.

73 Dave, G4AON