[MRCA] Czech Military RF-10 Radio

[sbjohnston at aol.com]

I *think* I bought my pair from Coleman's some years ago.  It might have been another surplus dealer, but I do think it was Coleman's.  As I recall, both worked out of the box, but one had a receiver "birdie" signal audible on 51.0 MHz (the frequency I was most interested in using, of course).  I opened it up and traced the signal to the VCO/PLL section which is inside a shielded box.  I improved the grounding of that shield and the strength of the birdie was greatly reduced (almost gone) and the rig is now usable on 51.0 MHz.  I can just hear the birdie beating against a very weak signal after the fix.  Before, it was pretty strong, opening the squelch and disturbing medium-strength signals.

On one unit, I replaced the old batteries with a NiMH pack inside the metal battery box.  On the other rig I installed AA battery holders inside the box and used alkalines.  Both approaches seemed fine - both powered their transceiver for two+ days at the Hamvention and had lots of life left.  If one used D-cells as original it would probably run for weeks!

A friend in Ohio bought one around the same time, and the handset had an intermittent connection in the handset connector.  I think it would not key the transmitter so it was probably the PTT line.  An easy fix on the back of the connector as he described it.,


Steve WD8DAS   

sbjohnston at aol.com   
http://www.wd8das.net/   http://af4k-crystals.com/   
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Mein Ohr ganz nah am Weltempfänger...


 

    On Thursday, November 7, 2024 at 06:12:38 AM HST, Jason WA6BBQ <w6iee.73 at gmail.com> wrote:   

 Thanks for causing me to just spend a bunch of money. :D
Jason WA6BBQ
On Tue, Nov 5, 2024 at 14:09 sbjohnston--- via MRCA <mrca at mailman.qth.net> wrote:

I noticed the other day that Coleman's surplus is selling RF-10 transceivers...
https://colemans.com/czech-military-rf-10-radio
Looks like the full kit.

Steve WD8DAS   

sbjohnston at aol.com   

Mein Ohr ganz nah am Weltempfänger...


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