A "fine -tuning Clarifier for the 858SSb Chassis

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One of the drawbacks of the 858 rig is the lack of a dual clarifier control . A single 20k ohm pot is used on these sets, nnd it is very diffivult to lock on to a station in ssb.  Some of the later Uniden models (Cobra 2000 and PB010 board exports)  have a Coarse/Fine clarifier, but adapting this to the 858 is difficult. A 10-turn pot is one solution, but is tiresome to use. A quick and dirty mod for this is shown below.

Adding an additional 1k ohm pot in series with the existing 20k ohm control will provide the fine tuning we desire. The control I used is a 1k ohm pot with a push-pull dpdt switch. This allows bypassing of the fine tuning pot inorder to return the claifier circuit to stock. I used the second pole on the switch to control an led so I can easily see if the fine tuning control is activated. The clarifier control on the Cobra 2000GTL is a dual pot (20k and 1k ohm.) perfect for this application. This same pot is used on many of the Uniden Exports/clones.  When you need to go to channel center, Center the voarse control and turn the fine tume pot fully CCW.