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took a look over that schematic diagram. but the bias circuit on this diagram is messed up. at relay RLY1 - 14,15,16 just a drawing mistake. ? and that feedback through the 27pF capacitor from the amplifier output. hmmm! so will pull the board out, and do some continuity tests. so the...

Here is my older post. it looks like resistor R14 was changed to 100 ohms. and I disconnected that screwball input circuit, and just have one resistor there, and I feed this with a China made Cobra 148...

Hey, I just dug out this Dynamo 175 amp that I was playing with over a year ago, adjusting the bias, by-passing RX pre-amp, correcting the RF input circuit. I got it working good. I always wanted the proper schematic. and I just found the schematic this morning! maybe? "AUTOMATIC SIDE BAND"...

bump. bump. I remembered this thread. just thought I would be an "Adam Henry" here. was just outside in a T-shirt, dinking a cold beer, with my cellphone camera in hand. I thought I saw an alligator a few days ago. I did see a large green Anole lizard. that one white/yellow flower may...

oh! I was just outside, walking around, in a T-shirt, drinking a brew.

I have been reading this thread here. I have a local with a 2517 with maybe the same problem. it was a few weeks ago. He said his 2517 has weak receive signal. so can you see a high level S-meter reading and with low audio? is it low audio, or bad receiver problem? I will cell phone...

. ha ha ha. yes! I agree so much. True. true. the way the 27 MHz RF wiring is done. all them input switches for LOW MED HIGH the "v" variable models. all is bad. all is wrong. so messed up.... I can't believe what I see. for example, them RM Italy "linear" amps. (no bias...

so do you have the AM or SSB button pushed in.? if your amp still matches the schematic. measure input SWR with one or both pushed in. this changes the RF input network. I have a customer's TS DX-250 that I posted here about, and I keep both AM and SSB switches pushed in, and the input match...

hey - BC Coyote I can tell lots of "sea stories" stories. after I drink some beers, talking with the guys at the sports bar. lots of stories. I can tell. one after another! it was a blast. being a Merchant Marine back then. with one company, 1986 (Crowley) I had good living conditions...

been following this thread, since I like working on these older Galaxy / RCI radios. found some posts on here from a few people that I can relate to, about knowing Morse Code, and all this FCC "paper." back when I was 18, (1977) I had an Advanced, or Extra Class by then. it opened doors for...

yes, I see now. no AMC adjust VR12 on the Madison. yes VR12 on the 2000. I usually turn them off. ALC and AMC. I don't like how they hang in briefly, after they kick in. certain capacitors can be removed to prevent that. but I adjust the mic gain properly and talk. but when the radio...

bump. bump. it has been cold here a few weeks. but warmed up today. warmer here than in Miami FL right now. yes, saw some ants on the ground near my trash cans. gonna be warm for Mardis Gras Feb. 17 .

inquiring minds here want to know what your malfunction is with that Madison radio? I have worked on several of these Uniden boards now, and am taking a liking to them. I had a Madison a few weeks ago, with the carrier osc xtal X4 falling out off the board due to the corrosive glue.

yes, and SuperLid mentioned. that also. looks just like a RM Italy KL-300 both have no bias on the RF output transistors, and both claim to be "linear amplifiers" maybe adding a feedback network, and bias circuit, then that little amp can be made to work good.

tell us more... what amp? what are you trying to do exactly. on them Palmar / Texas Star type amps I make a good single input with some resistors. match to the driving radio for about 3.5 watts drive.

I thought I would chime in, and brag (as I usually do!) I ain't trading! with any of you! I was just walking around outside in a tee-shirt while drinking a cold beer. but I just got a cell phone text message from electric utilities company about the coming cold air mass, that it may get below...

I am just joking, and assuming this. but most likely, that is what happened. :):):):) to burn that RX pre-amp transistor out.

on them there RCI/Galaxy boards, I would just take my scope probe at "X1" setting to the case of that 10.695 crystal and adjust L18/19/20 having the output of scope to my freq counter. using the oscilloscope as an amplifier to feed my external counter. (I have all old (like me!) primitive...

the pre-amp is burned out since somebody connected the RF out from their radio to the "antenna" of that amp to see if it works like that. it did not work, so then they started flipping switches, and it still did not work. so then they swapped the coax cables on the back of that amp to see if...

OK, on the history. that schematic I uploaded says to add the negative feedback to them. this one does not have that, but This amp here has 5 Toshiba 2SC2879's in it. obviously been worked on, big heavy red/black 12V power wires. and some good soldering. it has potential! hopefully jut the...