Re: [Drakelist] R7 Tuning Instability

[Gary Poland]

Arthur,
  Check the 25 volt DC input from the power supply board to the VCO. If that 
voltage is low the VCO doesn’t have the range it needs to tune the 10 and 15 
meter bands. If your power supply board is the older type with the dc to dc 
converter, check the core on the transformer to make sure it hasn’t slipped out 
of position. The voltage should be between 23 and 24 volts if I remember right.

73, Gary___
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[Drakelist] R7 Tuning Instability

[Arthur Delibert]

I have a Drake R7 that sometimes displays an instability on the higher 
frequency bands when I first turn it on.  On the 21 and 28 MHz bands the 
frequency reads as 16xxx kHz or 32xxx kHz, and continually increases, as if the 
radio is slowly counting something.  The lower frequency ranges act normally.  
The same thing happens on the Aux7 frequencies that use 21 MHz band selector 
setting. 

The problem continues for about 5 minutes, and then the radio settles down and 
acts normally on all bands.

I've tried cleaning the switch contacts on both the band selector switch and 
the Aux Program switch, but that didn't seem to make any difference.

Any thoughts?  

Thanks.

Art Delibert
KB3FJO
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