[Elecraft] K3 and RTTY

[Lyle Johnson]

>  I've tried using the dual PB capability of the K3 on RTTY but can never
> seem to get a RTTY signal through it to be able to decode (I am using
> MMTTY). No problem without using the DPB filters. So if someone has the time
> might you walk me through the settings you use for the K3 and RTTY? Roofing
> filter, offsets (if any) and such?

I use the AFSK or FSK submodes of DATA.  PITCH is set to the same as the 
PC program (I have tested with DM780, MultiPSK and MMTTY) or external 
decoder (I have tested with KAM Plus, PK-232 and PTCIIex.  I expect a 
DXP-38 to arrive today so I can test with it as well).

Note the dual tone filter is set for 170 Hz shift.  Copying the W1AW 
RTTY bulletin works fine (170 Hz shift, 45.45 bps), but copying the 
AMTOR-B bulletins does not work well (200Hz shift 100 bps).

Use the "CWT" function on the K3 for tuning in AFSK or FSK modes for 
equal deflection of the two bars in the display.  The internal decoder, 
if enabled, will scroll text.  It is using the dual tone filter, even if 
you have not selected it.

Be sure the PC program or external decoder is set for the same tone 
polarity as the K3.  The PTCIIex, for example, expects USB so you have 
to issue TONES 3 to reverse the tones when using it in AFSK or FSK modes 
on the K3.

73,

Lyle KK7P