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Well, I can if you want me too.... LOL Didn't think anyone would really need this mod, since this model is not very sought after.

 

 

The original clarifier mod:

 

Remove D25 and R119, cut traces on both sides of the clarifier control, solder a wire from one side of the clarifier control pot to ground, solder a wire from the other side of the clarifier control to a regulated +8V source (usually IC4). Find the +8V using a voltmeter. Re-align the modes by adjusting L15, L16, and L17.

 

 

I did all that, but I changed a few things, as I needed to slide more than 5kc back so I could run the correct frequencies above channel 40.

 

I changed out X1, the mixing crystal to a 10.240 mhz, replacing the 10.2417 mhz crystal. Replaced D23 (the varactor diode, or varicap as some people call it) to a different diode that provides more slide (the ones out of a Cobra 148 work perfect). Added a 3.3uf electrolytic capacitor between the center wiper of the clarifier pot to ground, to provide smoother, more linear clarifier operation. Saturated D23 and a small area around D23 with candlewax to reduce drifting. (The varactor diodes tend to be temperature sensitive.)

 

Presto! We now have an open clarifier that slides about 7 kc total. Perfect for my needs, I have my 5kc I need, plus 1kc extra in each direction. It's rock solid on stability, works great. :thumbup:

 

-Exit