[Elecraft] RTTY Filters 180Hz off QRG

[Dominik Bugmann]

Hi Elecrafters,

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).

73 de Dominik, HB9CZF