[Elecraft] KSB2 problem status: befuddled
Neal Campbell and Sarah Ferrell
k3nc at arrl.net
Mon Feb 21 17:05:55 EST 2005
Hi Don and all,
I have spent the afternoon looking for where I could have made a
mistake on the 40m LPF circuit. I didn't find any obvious ones, the
toroids came from 'The guy de Toroids' but I counted them all anyway,
and they are (luckily!) correct. Same for capacitors. Did the run of
voltage checks and didn't notice anything really wrong.
On cw, cranking the output knob to the max, the display readings for
current are
80 3.22
40 3.36
30 2.84
20 2.38
17 3.08
15 2.84
12 2.62
10 2.42
Output reads over 15 watts in all cases, usually abt 15.2. This reads
pretty much the same with or without the SSB module installed.
I take it from your comments that the fact that 40m is the highest cw
reading, its indicative of something wrong. Looked at LPF and BPF
areas. What should I expect on the amp readings, 2.35 on 40 and a
gradual increase as I go towards 10m?
I could reinstall the resistors and jumper and take out the noise
blanker module as thats something put in yesterday, I take it that I
need to do that if I want to test without it?
I have boosted cal cur to 4.0 and still can get hi cur signal with
output fully counterclockwise on both usb and lsb. I have been very
happy working cw all week as it is (set the cal cur to 3.5 and it
hasn't tripped yet).
Any more ideas to look at?
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