Ken,
Soldering problems on R2, RP5 or D5 and D6 can cause that problem. At
one end of rotation of R2 (the bandwidth pot) you should have near 6
volts on the cathodes of D5 and D6, and at the other end of rotation you
should have near zero volts.
You can measure with your DMM. I suspect you have zero volts all the time.
73,
Don W3FPR
On 4/9/2015 2:43 PM, Kenneth Talbott wrote:
Even in the extreme counterclockwise position of the Filter pot, the width
is TOO wide. A full quieting CW signal (not really strong, simply above the
noise) can be heard at diminishing volume 800 Hz above and below the center
frequency (1.6 kHz wide!). This is an older KX1 which I purchased built.
Any suggestions as to where I should start troubleshooting? I have reviewed
the assembly documentation and schematic. At the top end of resistors at
pins 2 and 3 of RP5 what voltage should I expect at the extreme ends of R2?
Can this be measured with DMM or would I need an RF voltmeter? Thanks for
any suggestions.
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