Notes from the Editor (WA6ILQ):
N1BEC wrote this conversion and it is similar to KD3IJ's mod.
This modification moves the top end of the RF circuits to 54 MHz.
No changes are made in the audio or control circuits.
Mitrek High Split to 6M Ham Band Conversion 11-02-03 By Tom Herman, CETma N1BEC/7 Here are the parts that need to be changed out to make the low band-high split 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 N1BEC
Up one level (Mitrek index)
Up two levels (Moto Index)
Back to Home
Original text (the white background) © Copyright Tom Herman N1BEC/7
HTML by Mike Morris WA6ILQ
This page last updated 3-March-2004
Mitrek® is a registered trademark of Motorola Inc.
The information presented in and on these conversion pages is © Copyrighted 1995 - 2003 by Kevin Custer W3KKC and multiple originating authors.