[Elecraft] [K3] what audio passband should I expect in TX DATA/DATA A mode?

[Pierfrancesco Caci]

>>>>> "Joe" == Joe Subich, W4TV <lists at subich.com> writes:


    Joe> It depends on your "roofing" filter ... If you have an AM (6 KHz) or
    Joe> FM (13 KHz) filter, you will see 300 Hz to 4200 Hz with FC=2.20 and
    Joe> BW=4.00 (at -3dB).  If you only have a 2.8 KHz filter, bandwidth
    Joe> will be around 2800 Hz (900 - 3700 with FC=2.20 and BW=4.00 or 400 -
    Joe> 3200 with FC=1.60 and BW=4.00).

    Joe> If you see roll-off at 3400 Hz you either have a narrow roofing filter
    Joe> or the DSP center frequency (FC) is set too low.

    Joe> 73,

Thanks Joe,
this is exactly what I needed to know. I'm using the FM filter, and
moving the passband up (by using SHIFT until FC=2.2), I can get the full
4 kHz, from slightly less than 300 Hz to slightly more than 4100.
I've saved this as NORM2 for data mode. 

Pf




-- 
Pierfrancesco Caci, ik5pvx