Posted by
Raimon-3 on
May 20, 2012; 5:47pm
URL: http://elecraft.85.s1.nabble.com/K1-output-tp7556156.html
For the atton. to Don Wilhelm W3FPR
Dear Don, I need again your help (I got your help time ago, for my K2
100, my problem was easily solved)
My K1 serial nr. 493, revision D, with Firmware upgrade Rev. 109, and
with KAT1, has been working flawlessly for some years.
Now, after some months QRT in my shack, I tried it again, and a problem
appeared:
No matter what is the Power Out setting (I can modify output setting),
when transmitting no bars are shown, in Tune mode shows P 0.1, and I
cannot change power output with WPM, Same behaviour connected to a dummy
load.
I removed KAT1, (I did not forget the jumper in J2), and the problem
persists.
Connected the K1 (without KAT1) to a dummy load through an Oak Hills QRP
wattmeter, it reads 2 watts no matter what is the power out setting. No
bars in the display.
When I transmit, the signal can be heard in a nearby receiver, at the
frequency shown in the display.
Reception is working OK.
So I proceeded to the Transmitter Signal Tracing
These are the readings (40 meter band)
PRE: 0.049 V
ATTN: 0.014 V
OSC: 0.08 V
MIX: 0.082 V
BUF: 1.581 V
TRI: 0.702 V
BPF: 0.422 V
TR2: 0.387 V
TR3: 0.000 V
DRV: 1.63V
PA: 16.15
ANT: 10.17 V
RFD: *0.02 V*
I suspect a bad solder developed over the years.
Where should I look for this failing behaviour?
Many thanks in advance for your help
Raimon Pardos
EA3EZO
[hidden email]
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