[Elecraft] fldigi and flrig and the filters of K3 and KX3

[Don Wilhelm]

Julie,

You *can* just select RTTY (or CW) in Fldigi and operate just as you 
would with PSK with the KX3 (or K3) in DATA A mode - you may have to 
select REV (or INV) in Fldigi for RTTY since the rig is in USB and RTTY 
normally uses LSB - CW will not care about the sideband selected.
Running that way, you are depending on the filtering in Fldigi to 
adequately separate the signals - you can enhance that by reducing the 
waterfall display width using the K3 (or KX3) shift and width (or HiCut 
and LoCut if that is easier for you) controls to zero in on the desired 
signal and eliminate interfering stations on the side (it also works 
that way for PSK when things get crowded and there is a strong adjacent 
signal reducing the sensitivity of the K3 by the AGC action).

It is usually easier to use MMTTY for RTTY operation and AFSK A mode on 
the K3/KX3.  AFSK A defaults to LSB, and the K3/KX3 and MMTTY displays 
the mark frequency (as is normal for RTTY operators). There is no 
waterfall, you tune in the desired signal, and if the band is crowded, 
reduce the K3/KX3 filters to isolate that signal.

I would suggest you try the Fldigi approach first because you are 
already set up for that and familiar with its operation in PSK.
Then for RTTY begin to try out MMTTY to see if that works out better for 
you - if so, use it, if not, go back to Fldigi.

73,
Don W3FPR

On 6/2/2014 2:49 PM, jsdroyster at nc.rr.com wrote:
> Hello to all and THANKS in advance for enlightening me on fldigi and flrig used with KX3 and K3.
> We havwe been doing fine with fldigi alone (no flrig) and PSK on KX3 and K3.
> Now Larry (my husband K4MWE) wants to branch out to RTTY and to try CW via fldigi.
> (Yes, we want to learn to hear CW but Larry's hand is not going to be able to transmit with the key he bought years ago.)
>
> So here is the question:
> In PSK I grasp that the bandwidth on the KX3 or K3 is set wide to establish the waterfall.
> For RTTY I understand that the radio has the special dual PB filter, BUT do I use it OR do I still set the wide filter for the waterfall?
> (I tried using the RTTY filter of the radio and the waterfall was 2 narrow blue tracks.)
>
> If RTTY usually is at 14080 and above then do I want the waterfall to start lower than that?
>
> Bumbling along on the digital learning curve...
> 73,
> Julie KT4JR
>
>
>
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