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Leap, the bias diodes are different, and why the readings arent the same.
According to Rick Jackson's schematic on cb tricks for the 148, the driver diode is labeled d50 and is a MV1Y.. The final diode is labeled d49 and is a MV13YH.
I remembered thinking the same thing one time while...
I dunno robb, maybe... It doesnt look like its been touched. Its looks like new, most likely been ran as a base, got the stick on feet on the bottom case.
3w swingin to 6 on AM, doesnt give me the impression its been turned up. But I wont really know unless I get 'er fixed I guess.
But I get...
Got a good buy on this radio (or so I thought). I knew the final had a bad rep, and sure enough, I received the radio, and no tx. Pulled the final, and it tested bad.
I sourced two replacements, threw one in, and I had tx. 3 swingin to around 6 on a.m. everything seemed fine. Flipped to lsb...
Check the audio ic with your multimeter and reference the service manual for the correct voltages.
Also, there are 3 different audio chips for the 29. Depending on when you r radios were made. The older ones had a 10pin chip, ta7222. Later models used a 10pin chip, yd1022. It will not...
I just repaired a 29nwstwx with a seemingly similar issue.
TX worked as it should and WX worked. Rx signal and audio, worked..kinda, but was very very faint.
One of the rx tuning cans, I assume, had a bad solder joint. I could press on the cans with my finger, and rx would return. I resoldered...
Daddyo, these guys arent trying to discourage you, so I hope you dont take it that way. But "just trying to get by with this" doesnt necessarilly work with radios. Thats all they're saying.
Take your time, and read..alot..
But a dummy load is essential, as has been said. Should be the first...
Those cobra 19 ultras have small pcb boards mounted to the main pcb. Try pushing around on the small boards and see if sound comes back. They're known to have bad solder joints where the smaller board mounts to the main pcb.
Does the new cobra 29 lx's ('14-'15) use the same alignment procedure, test points, etc..as the older ltd's? per cbtricks.
I havent messed with the newer models much, and just wanted to confirm before i get started.
Diddo on the grants. I got my grant xl in near perfect condition (only minor scratches) for like 40 bucks! They're not talked up like the 148's are i guess, and were still being produced till the early 2k's iirc, so they're not as hard to find in decent condition.. right now anyway.
There was a comparison review online I read a while back, but I cant find it now. It compared the "lower end" or "entry level" type analyzers. Rigexpert aa30, mfj 259b, palstar zm30, sark 100, and the feature tech aw07 were among the analyzers compared. It led me to believe the rigexpert to be...
Does it do it on any other channels? Or just 19/18?
If not, channel selector gets my vote. Most likely just dirty if its an older radio, or been in a dusty enviroment...
If its all channels, could be just a cold solder joint shorting out near the vco area.
just my .02
IIRC the modulation vr was marked "mod". It should be rv2 or d10 is the limiter according to another site.
But I wouldnt turn on it too much. Or clip the limiter. I ended up turning the one I was messing with back down. It really muffled the audio when turned up, and sounded like chit.
The...
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