Gary does not work weekends, and you can likely have it isolated by then.
If you have no output from U10-4, then how about the input at pin 1?
That should be the BFO signal fed to the transmit mixer. (you do have
the KSB2 plugged in correctly do you not?). The only other signal that
must be present is the TX VFO which should have at least 70 mV RF on U10
pin 6. You must be in TUNE or otherwise keydown to get RF to U10-1.
If you have RF at both U10-1 and U10-6, you shoudl also have RF at
U10-4. Check the DC voltage at pin 8 (it will only be present during
TUNE or other transmit periods).
73,
Don W3FPR
Gary Montalbine wrote:
Basic problem was engage mind before typing. High DC voltage at U8 and
no RF voltage at pin 4 of U10. Low RF voltage at pin 6 of U9. Wanted to
make sure my RF probe was good before continuing. It has been many years
since I have messed with electronic circuits.I may be back at the Novice
level. Would this be the appropriate forum to address my transmitting
problems or should I bother Gary?
I appreciate everybodys help thus far.
Gary, WA4SZI
K2 #1009
Don Wilhelm wrote:
Gary,
I must be misreading something or you had a typo. RF Board U8 is a
voltage regulator - you will not find any RF there.
73,
Don W3FPR
Gary Montalbine wrote:
Thanks all for the response. My RF probe works at TP1 and the PLL and
VCO circuits. U8 was where I had no voltage and was unsure of the
probe. Need to check further.
Gary, WA4SZI
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