David,
Yes, the most likely problem has to do with the filter board, and the
most likely area of the filter board is the PreMixer bandpass filter.
Is this a 4 band board or a 2 band 40 and 20 board? If it is a 4 band
board, you must align 15 (or 17) meters before 20 meters and 30 meters
before 40 meters. If it is a 4 band board, be certain you are listening
to a 15 (17) meter signal when you peak the receive.
I suggest first peaking the receive with a strong steady signal. If
necessary to fine the peak, measure the audio output with your DMM set
for AC volts.
Once you have aligned for receive, you should be able to get more
substantial RF output and will be able to repeak the bandpass filters
during transmit.
73,
Don W3FPR
.
On 3/18/2013 1:48 PM, David L DuPuy wrote:
I've completed building all but the ATU on my K1, and operation appears to
be normal except for no output on 20m. I'm hearing strong signals on both
40 and 20, the receiver sounds great. On 40m it shows an output up to 5.7
watts. I made a brief contact on 40m (rather poor band conditions). On
20m, it will only go up to 0.4 watts (showing "P.4").
I'm using a G5RV and an external Palstar tuner for which I know the
settings for each band. On 40m I'm showing SWR 1.0:1 and output somewhere
between 5 and 10 watts. No output on 20m. I have not yet tried to trace a
signal, but presume I could use my oscilloscope in place of the RF probe
described in the manual? Any ideas on where to look for an incorrect or
missing part for 20m only? Sounds to me like this problem has to be on the
filter board?? Many thanks... this reflector has been most helpful.
David AC4BN
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