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Mitrek High Split to 6M Ham Band Conversion [message #1039] Sat, 15 October 2011 04:57
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Registered: December 2004
Senior Member
11-02-03

By Tom Herman, CETma N1BEC/7

Here are the parts that need to be changed out to make the Motorola Mitrek operate well on the Six Meter Ham Band.

The criteria here was to make the conversion as easy as possible, and to do this by changing out capacitors only, and just as many as are actually needed for good operation.

Possibly other parts could be changed out, but the following list will get you the best performance for the least grief!

Do yourself a favor, and use a good, hot soldering iron. To do this conversion, a number of coil shields must be removed, and some of the parts are soldered onto fairly substantial groundplanes.

Also, if you do not solder the cans back on well, you will wind up with annoying intermittents!

After re-tuning, the Mitrek in question gave me the rated power of 50 watts, and good receiver sensitivity.

Transmitter:

Part #        Orig. Value   6M Value    Notes:
C 701         16 pF             12 pF   Watch soldering on cans of L 701- 
C 703         24 pF             20 pF   L 705: Very Hi Q circuits! Poor
C 704        150 pF            120 pF   Soldering will cause erratic TX
C 707         33 pF             24 pF   power!
C 710         22 pF             15 pF
C 712         22 pF             15 pF
C 713         27 pF             20 pF

Receiver:
Part # Orig. Value 6M Value Notes: C 166 100 pF 80-90 pF Rx picked up 0.05 uV sens. Tunes C 101 30 pF 15 pF much better after conversion! C 104 22 pF 15 pF C 106 22 pF 15 pF C 108 22 pF 15 pF C 110 22 pF 15 pF
Good Luck and have fun!

-Tom
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