Old President Grant same cobra 138XLR and Trc449 odd problem not sure where to start.

[NZ8N]

The TX coils are still "false peaked" at 22 MHz, from before hooking that jumper back up, either to the center leg or end leg. Have you tried to repeak them to see if you can get it back to 27 MHz ?

 

[kopcicle]

before today's hiatus , Yes . I talked him through it.

 

[Low_Boy]

Yes I tried returning the coils can't get to 27 MHz. Did not gain any headway by hooking the coil up correctly. I am now thinking about pulling every transistor and in the transmit section and checking them one at a time. I remember this radio used to work once in a while in SSB. Now I get a carrier at the same 22.7 MHz.

 

[Low_Boy]

New list of components that all check good
TR40, TR10, TR9, TR8, D53, C28
l also rechecked IC5 still good. Also FET4, FET6, FET7.

 

[nomadradio]

Oooh! You have a dual-gate MOSFET tester?

What kind?

73

 

[Low_Boy]

No. I just use my transistor tester and switch the probes.
No good?

 

[nomadradio]

Good question. I just hook the two gates together, and test as a single-gate MOSFET.

73

 

[guitar_199]

(just breaking in to say) each and every ONE of you are absolute card-carrying BAD ASSES at this stuff.

I love this place!!!!!

Please continue.....

 

[Low_Boy]

Thanks but you must be talking about the other guys. LoL

 

[Low_Boy]

Good question. I just hook the two gates together, and test as a single-gate MOSFET.

73

I like your idea. I just switch one probe from 1 gate to the other.