George,
The sidetone comes into the AF2 (wiper) connection to the AF gain
control, try there with your 'scope. You might see it at AF1, but that
depends on the position of the AF Gain - at normal AF Gain settings it
may be too small there for the amplitude setting of your 'scope.
As for the K6XX CW indicator functioning - and since you do have a
'scope - then once you can power up the indicator board, look for an
audio signal between ground and either side of the capacitor to the left
of the tuning pot (the cap above the IC). You should find a sawtooth
signal there. If you want to pre-adjust the frequency of the indicator,
adjust the pot until you have the frequency of that waveform at your
desired sidetone pitch. I use a frequency counter, but you can use a
'scope with some arithmetic based on the horizontal time base setting of
your 'scope.
73,
Don W3FPR
On 2/15/2015 5:46 PM, George Averill wrote:
All,
I feel like I’m trying to perform brain surgery with a pocket knife. All of my
test equipment is as ancient as I am. HI Where did all the tubes go?
The first kit didn’t work so I have ordered another one. That should solve the
problem if the problem is the IC in the kit. I will also try to take more time
soldering the surface mount components this time.
What really puzzles me is that, with the kit out of the circuit, and using a
scope, I have never been able to pull a 600 Hz sidetone signal off the side of
the volume control, but I can off the speaker. I’m positive that the wire to
the volume control is OK, and it’s connected to AF1 at the volume control
coming from the AF Preamp. It’s also connected as per the instructions that
came with the kit.
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