The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Hi Folks,

I have an older but functional 148 GTL PC-412. I like mod to 7 Mhz ham band. Is posible? Does anybody have sugestions for this mod?
Thanks
Greetings from M?xico

:D HI FOLKS !
THE THING PUTS OUT 10 WATT RMS IN AM MODE AND 12 PEP IN SSB ! I FINALY FIND THE FAIL. A CAP INSIDE T3 ARE OUT OF SPEC, I PUT A VAR CAP ACROSS T3 AND ANOTHER CAP VAR INSTEAD C7. THAT CHANGES GIVE ME 20.105 MHZ. I WILL POST A SCOPE MEASUREMENT FOR SOME RF STAGES OF THE 3-5825A.

SALUDOS ...

Hi, I am restoring this equipment. You can check in this www
http://www.cbtricks.com

The Hygain 5 (2705) is the same radio that the GE 3-5825A.
Good luck

Saludos de M?XICO. Gretings from M?xico.

HI!
:D

I was working in the GE a little. I discover that the PLL/VCO lost lock in the channels 1 to 10. Very interesting. I replace the second TA7310 and I dont have TX out. But I have a big cuestion: The level in the MIXER OUT pin 9 of the first mixer are??. I can?t see a 37 MHZ signal in this ...

Hi lbcomms :)

I think the cb are a little "deaf". I don?t have a lab RF generator, and I don't made sensitivity test. I have a RS handie CB with rubber antenna for signal generation/inyection.

In fact I restore the first mixer and replace Q3, but when test in TP3, I have 2 RF volts @ 30.100 Mhz ...

Ok Thanks for your advise,

The first mixer TA7310 are ok( I replace ), But I have a question. What are the correct level for the output of th doubler/oscilator 10.0525 to 20.0150? I have only 200 mVolts in TP3 for 20.0150 MHz, and 2 volts for 30.100 Mhz !. I have a triplifier :D ?

And the ...

Update

1) The VCO and the PLL02A are OK. The same for the 10.0525 oscilator/doubler stage. :)

2) The first mixer and the 1? RF preamplifier are operational. I can receive distant cb station whit regular level and quality. :)

3) I proceed to check the second mixer and the firts TX RF ...

Hi Folks.

Actually I am working in resurrect a old CB, a GE 3-5825A SSB Radio.

Luckly I can adjust and lock the PLL( 5 volts in the PIN 6 of PLL02A), but I dont have RF power out. In some channels receive, but whit very low audio. I don?t not tested it agaisnt a RF signal source, only by other CB ...