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Got an old Cobra 142 GTL on the desk today. Issue: Low transmit in all modes. This radio belongs to a local that I talk to on a daily basis. He talked on this radio for about 6 months after he got it back from me. I just recapped it and aligned it. It was doing around 18w in all modes and AM...

I will say this about it: He praises this guy down south, as many other people do. He paid over 1200 bucks to have those two controls, HiFi, recorder and noise toys added. Funniest thing about it all is the fact that my work on these 30 to 50 year old radios that people are giving up on is...

Yes it is a Stryker, 497 I believe. This guy that owns the radio works on tube amps, very good at it too. He sends all his radios off down south of NC to that well known radio guy. He specifically stated one is for adjustable peak and the other for adjustable rms. He already has an adjustable...

Got a question... There's a local around here that speaks often about his radio having two separate controls mounted on the back of his radio. He states one is to vary is RMS, while the other varies his Peak. He had it done by a well known radio guy down south of me (very well known in the...

Yep, it was my frequency counter. Hooked one of my other freq counters up, realigned radio, dead on the money now. I guess running 400w through it blew out the front end, even though it's hooked in through a 30db sampler.

Thanks Brandon and TM for popping in. Yes, the coarse and fine tune controls were centered. The oscillators (34-35 mhz) align perfectly. The 7.8 mhz aligns perfectly. VCO adjusts perfectly. Buffers adjust perfectly. Something must be wrong with my external frequency counter. The external...

Got a Cobra 148GTL on the desk today. Owner just wanted a checkup. No channel mods No clarifier mods Limiter(s) intact No swing mods Only mod is a variable key on the back of the chassis (they removed the AM power VR and wired an external potentiometer in its place). Wax still in VCO, xmit...

Got a Cherokee CBS-1000 on the desk tonight. Looks like it went through a metal shredder, lol... Cover is all mangled up and marked up. Evaluation: Carrier level too high (6w carrier). Limiter removed. Audio IC getting hot. Off frequency. Audio sensitivity down (receive and transmit). Power...

Touched up ALL solder joints on the entire board. Still hasn't done it since Sunday morning. Anyway, finished it up. Works great, just like new. The owner is on his way to get it and I informed him of the gremlin. He said he would get back with me immediately if it does it again. Thank you guys..

Couldn't get it to reproduce the issue. Pryed on parts using my ceramic tuning driver, pushed around on all the IFT cans, shut it off for several hours and tried several times. Just can't get it to do it again. Guarantee it will do it again immediately upon the owner trying it out. Hey, I have...

This one radio is gonna be the death of me. Hooked it back up, turned it back on to finish up with alignment, immediately wouldn't key up. It would make the sound of keying up momentarily but would still be receiving while ptt was pressed. Picked radio up, shook it a few times, still no key up...

I had a good teacher...

Update: Replaced driver and final (2166/1969), got full output back. Swings around 25w PEP (without tuning) and RF power seems to function properly. Only keyed it a few times briefly to check for RF power function and modulation. Want to go back over my work again and check voltages and check...

23.4uh and 0.8 ohms out of circuit in tester.

After replacing R220, R221, C174: Final and driver not installed. Tests done in TX mode Pre-driver: Base - 1.15v Collector - 11.02v Emitter - 0.93v Driver solder pad: Base - 6.04v Collector - 2.89v Emitter - 0.00v Final solder pad: Base - 0.00v Collector - 2.89v Emitter - 0.00v What you...

Going over the schematic I noticed C175 should be a 680pf, but what's in this one is a 560pf. Would this much of a drop cause the base of the driver pad (without driver installed) to show 5.23v? What should the base voltage of the driver pad be without the driver installed?

Gonna wait to throw this other final and driver in until I hear back from you two guys on the above results with no driver/final in circuit, in transmit mode with pre-driver in circuit.

Wanted to give some input before I throw this good driver and final in here. With the driver and final out of circuit, testing solder pads where driver/final goes in transmit mode with volt meter: Driver Base - 5.23v (kind of high I think) Collector - 2.89v Emitter - 0.00v Final Base - 0.00v...

Back on the 55v... The driver, after removing leads from the board is showing as a PNP transistor, whereas the final after removing leads from the board is showing as an NPN. Using multimeter set to diode mode. Used the parts radio to confirm everything else. Getting 27mhz to the pre-The...

Had to run do an OS conversion on another PC. Now I'm gonna get back started on this radio. Tip: For all those that don't want the Windows 11, or would rather stick with Windows 10 while still retaining updates without paying the ESU fees to keep Windows 10 updated another year, then just...