[Elecraft] [K1] No power out

[Bob Molloy]

Don,

First of all I couldn't have solved this without your help. Thanks very
much. Elecraft should be paying you for your services.

The symptom was "no power out" during the band alignment of a 2-band filter
board in "9. Alignment and Test, Part II." Here is a recap of what it took
to fix this problem:

It quickly became obvious that I needed an RF probe. I ordered kit RFPROBE
from Elecraft. It arrived here in about 2 days.

Almost everything else I did was at the direction of Don W3FPR. The first
symptom he attacked was: no voltage on FIL-P1 Pin 6.

1. Peaked the RF voltage on the left side of C3 using L1.

2. Peaked the right side of C3 using L2.

3. Did the same for C8 using L3 and L4.

4. Peaked the voltage at FIL-P1 Pin 6 on both bands.

5. Now I reran all the steps in "7. Alignment and Test, Part I" to get the
receiver aligned. Still no transmit power.

6. Started Transmitter Signal Tracing as described in "Appendix E,
Troubleshooting."

7. Everything looked good up to the BPF (bandpass filter) test point where
the voltage was zero.

8. Checked Band 2 (20 meters) and it was fine.

9. Pulled the filter board to inspect the solder joints in the Band 1
bandpass filter area. Found a couple that looked iffy.

10. Re-soldered the joints that looked incomplete and reflowed most of the
others.

11. Re-installed the filter board and now had 2 Watts out on both bands.

I wish the RF probe was included in the K1 kit, but at least it was
available for ordering at a reasonable price.

Learned a lot. Looking forward to finishing and getting the K1 on the air.

73,
Bob  KD2UJ