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just took a pix. I used one of these old transistors from my stash, a 2N3638A for Q67 in a 2995. but any little audio PNP transistor should work. a 2N3906A type is common. . It's good to have a stash of some 2N3906, 2N3904, 2N2222 2N3053 (NTE128), MPF102, 2N3055, 2N3772 around. To repair...

hello there Larry! yes looks like Q67 is bad. I think Nomad was thinking of a kit to sell for that area. both transistors. Q66 n Q67. but I repaired a 2995 with this problem and just soldered in an old PNP audio transistor, with some good long leads. just takes some soldering skills, remove...

OK, got Lotto tickets. a little bottle of Jack Daniels. (gonna be cold down here again tonight!) on this 2970N4 here, in AM mode, mic all the way down, key up, and turn the power control down for 3 volts at the shorting board T.P. 7/8/9. and looking from the front of the radio at transistor...

Q67 can be bad which drives the modulator Q66. a known problem in these. I did this repair on a 2995. I have a 2970N4 here with a blown external amp to play with. "015" main board is now working. yes, "pinched audio" in transmit I was told, bad in SSB and AM. I tested the stock mic and...

so nobody replied here to this one. ? ? ? are you new to SSB mode? go to ch. 38 LSB during the day, and are you hearing the madness there? test your receiver there. some hiss is normal in SSB receive. what version 148 radio do you have? the tag on the back of radio.? Red China, Free...

hmmmm. just looked at schematic. that 15 ohm resistor that burned up is R104. It is at the input of the 8 V regulator circuit. (TR23) measure the voltage at emmiter of TR23 in tx and rx measure the voltage across R104 compute the power there. V squared divided by 15 maybe put a two watt...

I was sending out some "brag" videos and pictures to my "peeps" yesterday also. was messing around on 10 meters. 29 MHz AM. but was nice outside, walking around, drinking beer in my short sleeves on Dec. 15 Too nice to play on the radio inside my house. . . you said: "Southern...

so no noise out of the speaker? of any kind? maybe a problem in the speaker switching circuit, the external speaker jack. /

I check the bias adjust voltage circuit on these IRF520 MOSFET RF output radios first. take out that T.P. 7/8/9 shorting board. key-up radio in SSB mode, mic turned all the way down, no audio, thus no RF to the IRF520's. then measure the voltage at the gate of the IRF520 Q49. on this radio...

I check the bias adjust voltage on these IRF520 radios first.

so when in FM mode, squelch off, volume up, do you get the usual receiver noise? the rush sound.? and in SSB mode receive, all that usual noise, as a radio with no antenna connected to it..??

looks like your modulation circuit is working. and you get a few watts of carrier output when with J22 unplugged you said. I would look into the 8 V switching T/R circuitry. maybe the 8 V for receive is bad.

OIC / oic / oh I see you have a previous post on this radio. ? ? sounds like there is a problem with the external RF amp.

I have this 99 mounted on a five-foot metal mast buried in the wet Louisiana ground, against an old decking. (so I can play with them "tuning rings") but I had it on a 10-foot metal mast, with the coax at a 90 degree angle running over to my house. the metal mast will do what the ground...

No replies yet? your descriptions go all over the place. I had fun working on one of these over a year ago. found trouble in the modulator (replaced Q67). Then I played around on the 10-meter repeaters up in New York state and Toronto for days from down here. is your main board a 011 or 015...

oh yes, yes, on the 2970. I have a broken 2970N4 here. The extra 400 W power amp is blown up. (aren't they all? this N4 amp set-up looks like a potential disaster!) So bypassed this N4 amp, and now a bare 2970 here. so have the carrier down to two watts or less and barely turn up the mic...

-- and this advice, that everyone here probably already knows, being this is the Prepper Forum. with like-minded people here. Us talking about emergency electrical power with a generator. You must protect your own property, and family first! You can't save the world and help all the...

yes, with this set up, nothing to change in the house. most of the people I know just run generators outside and have all these long extension cords all over the place, running through doors and windows sealed off with towels. and only power their fridge and a window AC. and that video...

I never uploaded a video here yet. and down here in southern Louisiana's hurricane and tornado country. many people have them Generac stand-by generator set-ups here. but here is video from Hurricane Francine Sept. 2024 and a few years earlier after Hurricane Ida I did the same thing. I do...

. I wanted a little amp, with a bias circuit already in it, and to be driven by my Cobra 148. I checked my pile of broken amps that were given to me. (I got that RM Italy amp working, but no bias, sucks in SSB!) Took a look at that DYNAMO amp, and recognized the board as the same as a PALOMAR...