I just replaced my single-ended T-network tuner plus balun with a
massive old Johnson Matchbox. It is very selective, unlike the T
network. It is as if there is a sharp bandpass filter between the
antenna and the rig.
This may be totally imaginary, and there's no easy way to A/B test it,
but it seems as though the K3 sounds "cleaner" in some sense.
Could it be that since the mixer sees a much narrower spectrum, there
are fewer spurious responses?
Do those of you who use bandpass filters for SO2R or multi-transmitter
contesting notice such an effect?
It also seems that the better balance (my antenna system is a dipole fed
with balanced line) has reduced RF in the shack and possibly local noise
pickup.
--
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
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