[Elecraft] RTTY using DATA mode on K3

[Richard Ferch]

WB0TUA wrote:

> I just bought a K3 a few weeks ago and have been using it on CW.  It's time to play \
> with it a bit on RTTY.  I'm using the Tigetronics Signalink to interface the radio to \
> my PC which is running MMTTY.  When I have the mode switch in the sideband position, \
> copy on the laptop is just fine and the signals display properly on the tuning aids \
> in MMTTY.  I read the manual pages about better performance if the DATA mode is \
> selected.  I switched to the DATA mode and there is very little audio in the speaker \
> and no signals displayed on the tuning aids in MMTTY.  No copy either.  I \
> double-checked the data mode setting and it is AFSK-A which I think is correct.  I \
> must have a setting wrong somewhere.  I've gone over the data section in the manual a \
> few more times but don't see what I'm doing wrong.  Any ideas?

Derek,

I wouldn't have said that DATA modes give you better performance 
necessarily, but using AFSK A gives you the ability to use a number of 
RTTY-specific features on the K3 that are not available in SSB mode.

In AFSK A, the default filter settings are much narrower than in LSB, so 
you don't have as much freedom to tune signals using an arbitrary audio 
frequency. Check that the PITCH setting on the K3 in AFSK A mode is 
consistent with the Mark setting in MMTTY, and that when you tune in a 
signal you tune such that the received audio mark tone lands on that 
audio frequency. To start with, I'd suggest that you turn MMTTY's AFC 
off, and use the K3's tuning knob to tune in signals - don't click with 
the mouse in the waterfall or let AFC tune to nearby signals.

73,
Rich VE3KI