[10m] CB to 10 Meter Beacon transmitter conversion?

Philip ndb_fch-344 at sbcglobal.net
Sat Feb 3 20:16:48 EST 2007


Hi All,

Being a natural born "beacon hound", I have long wanted to put up a 10M 
beacon of my own (yeah, just what we need, another beacon ;-)  Today I was 
given a CB "Ringo" antenna some push-up poles and even a non-operative 40 
Chan CB.  Since I made my living for awhile repairing these critters I 
didn't have any trouble repairing the CB (bad crystal, it had been 
"squashed").  Transmitting into my MFJ Autotuner (MFJ-993B Intellituner) the 
digital wattmeter indicates that it's putting out 3.8 watts into a dummy 
load, about
what would be expected for a "stock" radio. (I haven't tweaked the TX any
yet).

Anyway, NOW I want to convert this critter to a CW only transmitter in the 
frequency range of 28200-28300KCs.  An extensive "Google" hasn't turned up 
any helpful information so far.  This HAS to be a "Zero Cost" project as 
there are NO funds for it.

Here are the specifics of the radio.
1.  JC Penny model 6204, AM only.
2.  PLL02A PLL chip.  2 Xtals, one is 10.240 (the one that was bad and I had
spares).

I intend to remove the modulation transformer (don't need the voltage drop), 
audio ouput chip, most of the receive only circuitry etc, leaving just a 
plain PLL and TX chain, but it would be MUCh easier if I had a schematic of 
the unit.  Anybody have one you could email me?

ALL SUGGESTIONS for this project are welcome.  I would like to "shoot for" 
about 8-10 Watts output, CW (no modulation).

Any ideas on what stage to key (I'm thinking of keying the driver stage)? I 
plan on using my OLD Pentium laptop computer as a programmable ID-er keyer 
(I already have a nice DOS program for that function).

73 de Phil,  KO6BB
DX begins at the noise floor!

THE BEACONEER'S LAIR:   http://www.geocities.com/ko6bb/
MY RADIO-LOGS:       http://www.geocities.com/ko6bb/Logs/
QSL GALLERY: http://photobucket.com/albums/f306/KO6BB/
Merced, Central California,    37.3N  120.48W  CM97sh




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