Ranger 2970N2 help or suggestions

[Eldorado828]

So I've got a 2970N2 opened up and have a couple questions for you gents that are familiar with this board.

First 2 pictures is what I think is the limiter. One leg is up so I believe it is out of the circuit. Am I correct?


Next up is the coils, surely that isn't factory is it?

Now finally is this heat shrunken resistor on the bottom. Is it a swing mod of some kind?


Just trying to sort this one out and put it back to factory what ever is original. Your help is appreciated.

 

[BayouRadioAmplifier]

I was all over inside one of these radios last year.
it was worked on by a few. it had over 10 amps current
when keyed up in SSB, no audio in, so no RF out, and got hot.
the bias adjustments all messed up, on the main board,
and the external amplifier. IRF520s were changed,
and I believe they are fakes, so I could no get it to work
fully.

but I don't know why they cut out parts to disable the AMC and ALC
circuits. You can just adjust the pots to turn these off, on most radios.
then you can overmodulate all you want, distort and splatter!
be heard on all 40 channels, and more, in your neighborhood!

that resistor looks like it is soldered to the modulation transistor,
the "regulator" someone here probably knows that mod.

I read in many posts about these radios getting hot.
but, for a start, found this problem, in the driver IRF520.

RCI-2970N2 / 2950 IRF520 bias problem repair.

While working on my first 2970N2, from another techs hands, found the main transceiver unit was getting hot. low output. the IRF520 bias settings were way to high, and one was acting squirrelly, eventually damaging IRF520 Q62. With the shorting board and Q62 removed from the board, I...

www.worldwidedx.com

RCI-2970N2 / 2950 IRF520 bias problem repair.

While working on my first 2970N2, from another techs hands, found the main transceiver unit was getting hot. low output. the IRF520 bias settings were way to high, and one was acting squirrelly, eventually damaging IRF520 Q62. With the shorting board and Q62 removed from the board, I...

www.worldwidedx.com

.

 

[Eldorado828]

I was all over inside one of these radios last year.
it was worked on by a few. it had over 10 amps current
when keyed up in SSB, no audio in, so no RF out, and got hot.
the bias adjustments all messed up, on the main board,
and the external amplifier. IRF520s were changed,
and I believe they are fakes, so I could no get it to work
fully.

but I don't know why they cut out parts to disable the AMC and ALC
circuits. You can just adjust the pots to turn these off, on most radios.
then you can overmodulate all you want, distort and splatter!
be heard on all 40 channels, and more, in your neighborhood!

that resistor looks like it is soldered to the modulation transistor,
the "regulator" someone here probably knows that mod.

I read in many posts about these radios getting hot.
but, for a start, found this problem, in the driver IRF520.

RCI-2970N2 / 2950 IRF520 bias problem repair.

While working on my first 2970N2, from another techs hands, found the main transceiver unit was getting hot. low output. the IRF520 bias settings were way to high, and one was acting squirrelly, eventually damaging IRF520 Q62. With the shorting board and Q62 removed from the board, I...

www.worldwidedx.com

View attachment 65076

RCI-2970N2 / 2950 IRF520 bias problem repair.

While working on my first 2970N2, from another techs hands, found the main transceiver unit was getting hot. low output. the IRF520 bias settings were way to high, and one was acting squirrelly, eventually damaging IRF520 Q62. With the shorting board and Q62 removed from the board, I...

www.worldwidedx.com

.

I appreciate your reply, this is my first of this type from ranger. The limiter stuck out, the bottom side resistor immediately looked like a mod of some sort but wasn't sure. The resistor goes from the center pin of the regulator to the positive side of an electrolytic C260 that sits right next to the transformer. Not sure exactly but sure looks like a swing mod.

Figured throwing it out there just maybe someone would know.

 

[Eldorado828]

Does anyone have an idea about the resistor mentioned in post #1? Is it in fact part of a swing mod or a factory repair of some sort?

 

[Eldorado828]

Well the limiter is back where it's supposed to be and what I thought was a resistor turned out to be a diode.

Looking everything over now and will get it all buttoned up to try out this evening.