[Elecraft] RTTY Filters 180Hz off QRG

[Don Wilhelm]

Dominik,

I did not see another answer on the reflector to your question and thought I
might help.

The problem is that your BFOs for FL2, FL3 and FL4 are not the same as they
are for FL1.
Why would that make a difference you may want to ask -- look at the
instructions for the SSB option, and you will find that the K2 ALWAYS
transmits (in SSB or RTTY modes) using the BFO settings for FL1.

Simply set the BFO to the same frequency setting for all 4 filters - but
also be certain that the audio tones you are using are contained within the
passband.  The soundcard generated digital modes can handle altered tones
with no problem - just tell the program what tones to use, but a hardware
TNC may not have the capability to modify the tones used.

Also, if you prefer to use the SSB filters as they are now for SSB
operation, then enable "RTTY" mode which gives you an additional set of 4
filters to use for the digital modes.  The documentation for the version 2.x
firmware provides the information on enabling RTTY mode.

73,
Don W3FPR

----- Original Message ----- 
|
| I'm lost with my K2 since CQWW RTTY. At the start of the contest I could
not
| work anybody until I figured out that my K2 shifts the RX QRG by 180 Hz.
| During the Contest I solved the issue with RIT but I want to figure out
what
| happened.
|
| Right now I have an Omni VI+ on one side and the K2 on the other. Omni is
| using the built in FSK.
| K2 is using AFSK(high tones) through a DIGI-1 interface connected to the
PC.
|
| K2 is on 21050kHz, and "FL1 OP1" selected. I can tx and rx between both
TRX.
| No issues at all.
| If I select "FL2 1.00" the RTTY tones jump by 180Hz. The same for FL3 and
| FL4.
|
| Any idea how this can happen ? (Firmware is 2.03d 1.07)
|
| I double-checked in USB, LSB and CW mode and everything is ok. CW is
surely
| ok because I did 200 QSO last weekend in EU Spring and Oceania Contest.
| Earlier this year RTTY was transceive as well and I run about 1000
| RTTY-Contest QSO's.
| The only change I did was the KAF2 -> KDSP2 replacement (KDSP2 is bypassed
| and no change).
|
|