Hi, Don.
Well I finally did get around to checking out the KX1 with a signal generator.
Here are the signal levels at which I can barely distinguish a signal:
80m -126dBm
40m -130dBm
30m -107dBm
20m -120dBm
So, 30m does appear to have a problem.
I'll have to try re-tweaking the 30m trimmers, but it's interesting
that 80m has much better sensitivity than 30m. The KXB3080 manual
indicates that peaking the 30m trimmers affects 80m as well, so you'd
think that if 30m was poor 80m ought to be poor as well.
The KXB3080 manual indicates that on 30m, C3 and C4 come into play.
I'm unclear if on 80m C1 and C4 remain in play, or if they are
replaced by C2 and C5 (ie. are there any trimmer capacitors in play on
80m?) If both trimmers are out of play on 80m that would certainly
indicate that I simply need to find a non-metallic screw-driver and
peak the caps. If however the trimmers remain in play on 80m, and my
80m performance is pretty good, then perhaps either or both trimmer
caps are defective.
Anyway, next step is re-tweaking those caps!
Thanks,
Martin.
VA3SIE.
Martin,
I would be hesitant to make comparisons based on signals on the air.
The signal propagation can make a big difference.
If you have a signal generator that will produce a measurable (and
repeatable output, that can be used for a valid comparison.
Normally, the 30 meter signals are as good or better with the 3080
option as they were with the 30 meter option. You may have a problem,
but first try adjusting the 30 meter trimmers. For accuracy in
adjustment, they must be adjusted with an insulated screwdriver blade -
even a metallic screwdriver wrapped with tape will cause some de-tuning
during adjustment and you must find the proper tuning point by trial and
error.
73,
Don W3FPR
Martin (VA3SIE) wrote:
Hi,
I wonder if anyone else has an observation about the sensitivity of
the KX1 on 30m with the original 30m board compared to the 30 80m
board? I've noticed that signals are not as strong on 30m now with
the new board. For example, the RTTY station on 10100kHz is at best a
4x5 whereas it used to be 5x9. I can only hear the strongest CW
stations.
20m 40m are as good as before.
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