[Elecraft] Re: KX1 Part 1 problems?

[Wayne Burdick]

"pjhend@ameritech.net" wrote:

> Page 26:
> 
> D2 or D3 cathode(banded end) S1 On = 23mohm  (S2 on)
> D2 or D3 cathode (banded end) S1 OFF = 50mohm  (S2 on)
> Both are greater than 1K & 10K respectively so I guess that's ok?

Yes.


> Page 28:
> 
> DC voltages all check out fine
> 
> D2 Anode: reades 126mv AC rms
> D2 Cathode: Reads 116mv AC rms
> 
> Both are over the recommended 20mv AC rms. The instructions say that this
> indicates that one of the voltage regulators is oscillating, but I can't
> figure out what the troubleshooting should be. Any ideas?

You may be picking up 60 Hz AC noise on your probes, Paul. What does the meter
read if you put *both* probes on the same lead of each diode?

If you think the reading is "real", you might have a problem with a voltage
regulator. Usually this would be due to an unsoldered pin on an electrolytic
cap, or one installed backwards.

For other suggestions, run your symptoms by Gary on Monday.


> I completed the tests on page 29 with flying colors with everything working
> just fine. Should I continue on to to the next building steps or are those
> higher AC voltages and oscillation going to be a problem.

I think you could continue on. Let's make sure your AC measurements are stable, though.

73,
Wayne
N6KR

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