A couple of weeks ago I posted here regarding a problem whereby transmitting on
my 6m rig cause my XV222 (connected to K2/K60XV) to key up.
It appears that if any moderate amount of stray RF ends up on the tranmit IF
line (probably due to imperfect shielding of the transverter rear panel jacks),
this power is then detected by the power detector diode on the K60XV board,
which then apparently triggers the K2 to switch the state of the 8R line. This
then keys the transverter.
No word yet from those in the know as to whether this firmware behaviour in the
K2 is to be expected or not. Id be interested in hearing the results if anyone
else wants to try injecting up to 1 mW of RF (HF or VHF...it shouldn't matter
much) into the K2/K60XV XVTR OUT jack (while receiving) and checking to see
what happens.
I have found a solution which works at my home station. That is to put a
filter in the transmit IF line which passes 28 MHz but does not pass 50 MHz.
At present I have it mounted in an external box with a short coax cable to the
XVTR OUT jack on the K2. I think it still needs a little tweaking to give a
good match so that the K60XV will give full output in transmit, but the odd
effects when I transmit on 6m have completely disappeared.
I may still work on improving the XV222 shielding in case the problem is worse
in my rover setup.
73,
Steve VE3SMA
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