So: Somehow I wound up with two K2s. I bought the first one because
it was small - multiband - and QSK. I have
become enamored of transparent, conversational QSK - the kind where your
transmitted signal just sounds like all the other signals. The K2 alas
is not that, although it is PIN diode switched. I don't think any
commercial transceiver is.
Got K2 #2 to get the KPA100. Moved the KPA100 to #1, because #1 has
all the good mods - the PLL mod, the volume control mod, the upgraded
crystals, etc.
The closest I have been to really good QSK is a QRP-labs QCX+ kit. But
it's only one band, and the receiver is probably not as good as a K2
with a crystal filter - and K2 #1 even has the DSP audio filter. AND it
lacks AGC. I was operating field day, a local came on and nearly blew
me out of my chair :).
So here's my idea for perfect QSK: I use the two K2's as a
transmitter receiver pair. One on transmit, the other on receive.
Connect them to the antenna with a custom PIN diode switch. W6JL has a
lot of info on that in his QRZ page.
Arrange something like 130dB attenuation.... or whatever 100W ( or 500w
if I use a linear ) down to a microvolt or two.
HOWEVER... I really don't want to be synchronizing VFOs all the time.
So I find some sort of open source transceiver
control program. And modify it so it tunes TWO radios at the same time.
How good is QSK on the K4? Smooth/transparent? Or
clicky-choppy-AGC-pumpy?
- Jerry KF6VB
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