"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I could use some advice on how to proceed on this one. Here's the problem:
Sometimes when started from cold, the frequency display on my TR7 is
free-running (around 32.7 MHz and counting up) when the bandswitch is in the
21 or 28 MHz positions. Less frequently, it's also free running around 17
MHz when the bandswitch is set to any of the positions 14 MHz and below.
This is exactly the same thing that you'd expect to see if you press the
Fixed-RCV button and have the AUX switch set to NORM. When the rig warms up
a bit, the problem goes away. I suppose it's possible that the contacts of
the FIXED-RCV switch are intermittent, but working the switch rapidly has no
effect when the symptom occurs.
According to the service manual, the VCO does not need alignment if the
frequency display behaves as described there when the FIXED-RCV button is
pushed in. But, the info is insufficient for me to decide whether or not
the display is really showing what I think. For example, in one instance
the display is supposed to be counting UP in frequency to "approximately 17
MHz". Mine is counting up, but the frequency displayed is around 17.7 MHz.
Is that "approximately" 17 MHz? Same for the other oscillator - is 32.7 MHz
"approximately" 32 MHz? I've not checked the voltages on the VCO yet as
described in the alignment steps for the VCO.
There is no AUX board installed.
Thanks for any advice.
73, Floyd - K8AC
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