I'm reading with interest, Steve. I build my K2
early on (#380) and have done many of the mods,
but not that one as yet -- xtals earlier but not
all the caps, etc.; I'm not excited by working on
that closely-spaced board. (I'm just returning to
it after a ten-year hiatus, and have done other
updates in the past week). So I'll be following
your results here as part of my decision-making
process :-)
73, Phil
On 2/10/14, 7:09 AM, Steve Garwood wrote:
Don,
I am not the original builder of the K2, so I will be downloading
Spectrogram. I will go through the individual connection points for the
swapped crystals and capacitors with the ohmmeter to make sure that there
are no connection issues. Thanks for identifying a troubleshooting path!
I will advise on results.
Thanks again!
73,
Steve, N0CZV
-----Original Message-----
Steve,
How does the OP1 filter passband look when viewed on Spectrogram? It should
show a nice flat passband. If it has a dip or valley in it, look for a bad
connection on one of the capacitors or crystals.
What is the possibility that you damaged one of the thru-plated holes when
removing the old crystals and capacitors. Use the schematic to determine
'which is connected to what' and check all those connections with your
ohmmeter.
You may also have a problem with T1 or T2 soldering or a poor solder
connection in the switching diodes or R-Paks. Re-flow the solder in those
areas with a hot (750 degF) soldering iron.
73,
Don W3FPR
On 2/10/2014 2:30 AM, Steve Garwood wrote:
Hello!
I am working on a K2, <3000 s/n in which I installed the K2 SSBCAPKT
along with the 14 crystal kit.
Receive is working, audio level is low on the OP1 filter, normal on FL1,
etc.
I have transmit, with good audio, however, no measurable power output or
ALC reading.
I've been searching for something similar to this, no luck so far.....
It seems that the filter output is low, but functioning..... Alignment
addresses adjusting BFO frequency, but nothing about output level.
I checked soldering again, but I have not made it any further than
this....
Any ideas?
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