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  1. BayouRadioAmplifier

    Careful with those lithium battery banks

    just happened in New Orleans the other day. https://www.wwltv.com/article/news/local/orleans/tesla-catches-fire-at-charging-station/289-8a9f5cb6-943c-484f-b406-2e34f194ed62 in New York City, and over the pond, careful of them e-bikes: Bradford fatal house fire started by charging e-bike...
  2. BayouRadioAmplifier

    Superior Longhorn N6 SSB TX Distortion

    hmmmm! I like working on these radios. these 2950/2970/2995 types. so where can I find this schematic for this board EPT6950016A on this radio? in case I get one to repair.
  3. BayouRadioAmplifier

    Superior Longhorn N6 SSB TX Distortion

    Yes, usually the "assclowns mods" are to disable the TX ALC, by turning it way off, or by cutting out the transistors/diodes in the ALC circuit, as was done on some Uniden HR2510's I was given. You can get by in AM with the ALC and AMC disabled, but in SSB it sounds super bad. I would set the...
  4. BayouRadioAmplifier

    Another Galaxy Saturn thread. No V20 adjust. No front RF power knob adjust.

    First, I would put that shorting bar back in. key radio up in LSB/USB mode, no audio into MIC, and measure the voltage at either side of inductor L50 to ground and adjust VR20 and it should go up to .7 volts. it should be around .7 volts at L35 since the bias works on that transistor when...
  5. BayouRadioAmplifier

    NPC/Swing Mod for Cobra 148 GTL-B

    oh, also on this "B" radio that looked like new, but had problems. it had that newer fat stock Cobra microphone. The element was bad. so no transmit audio. so I use an older "coffin mic" on it. I have found on a few other newer stock Cobra fat mics, (not sure if these mics have a nickname.?)...
  6. BayouRadioAmplifier

    NPC/Swing Mod for Cobra 148 GTL-B

    the "Made in China" radio. one of them was given to me. it was messed up with a few modifications. it was drifty in SSB. I rewired it back to stock. Then one day, it would not change channels. I found a PLL problem. and found information in this website to this common problem in that...
  7. BayouRadioAmplifier

    Receive after transmit with amp on

    hmmmmmm! typical problem. sounds like relay contacts. clean the contacts. at the antenna switching contacts. rubbing alcohol and a piece of paper to wipe the contacts, all wetted in rubbing alcohol. when in transmit, all the RF power just arcs through the bad contacts.
  8. BayouRadioAmplifier

    Mentor needed

    Yes, have an 811H I use on the Amateur bands. and I have some amplifiers I am repairing for others. But have built MOSFET class-E H.F. AM transmitters, antennas, transmatches, etc.
  9. BayouRadioAmplifier

    Mentor needed

    back in the late 70's "Solid State Design for the Radio Amateur" was the book for me. It gives examples of designing little RF amplifiers, and shows what you need to know. also some other book, "RF Circuit Design" so Tickfawriver, I am down here near Thibodaux, and also worked in the...
  10. BayouRadioAmplifier

    Who works on Texas Star amps?

    here is a stack of amplifiers I took to "repair" I got two working after figuring out what the last guy did to screwed them up even worse. I don't need this!! Then gave the rest of them back.
  11. BayouRadioAmplifier

    Who works on Texas Star amps?

    yep, somebody screwed it up! Usually on these Texas Star / Palomar amps, I find them not working because it was overdriven. So the T/R relay circuit is burned out, and if the amp has a variable resistor on the RF input, it is burned out also. And then somebody tried to repair the T/R...
  12. BayouRadioAmplifier

    RCI-2950 non dx Frequency problem

    I would check out the PLL circuit. check the VCO to be on a certain frequency when radio is set to 28,000 kHz. there is a procedure in CB Tricks.
  13. BayouRadioAmplifier

    UhOh, Did Uncle Charlie Wake Up?

    yes, the FCC is not a law enforcement agency. I had them come to my house with a county sheriff deputy, back in 1993 or so. After I refused the FCC guy with a "little badge" entry into my house, he told the sheriff there is nothing they could do, and they took off. Then I got letters in the...
  14. BayouRadioAmplifier

    Ranger 2970N2 help or suggestions

    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...
  15. BayouRadioAmplifier

    6BQ5 red plating in a JB12 ?

    and yes, the 2 watt resistor needed at the input circuit if a few watts of input power, if it is a RF power amp. that was a big hint.
  16. BayouRadioAmplifier

    6BQ5 red plating in a JB12 ?

    OK, thanks, AudioShock. I got the first unit, got the diagram on CB Tricks. I told the guy that gave it to me that it says it is a "Receive Boost Amplifier" and he said no, that they are a TX AMP. a "little modulator" so I took another look at the diagram, and figured it out quicky...
  17. BayouRadioAmplifier

    6BQ5 red plating in a JB12 ?

    there is a 75 ohm 2 watt resistor on the input coil circuit. would not need a 2 watt there
  18. BayouRadioAmplifier

    6BQ5 red plating in a JB12 ?

    but NomadRadio, when these first came out, were they used as a receive pre-amp? ? and people saw that with a few changes it can be made into a transmit linear. but not much power from a 6BQ5. there are two of these in my area and the guys refer to them as "little modulators"
  19. BayouRadioAmplifier

    6BQ5 red plating in a JB12 ?

    yes, the guy down the road brought me a JB-12 "Receive Boost Amplifier" (cute, ha ha) to repair a few months ago. as Nomad said, the negative bias. pull that 6BQ5 out, don't let it get red. no need for it to be in the circuit at this point. power up and measure around negative 45 volts...
  20. BayouRadioAmplifier

    Galaxy 2517 ept690010d Low power in am and fm mode

    on your VR14. maybe you can get some rubbing alcohol inside the part... turn it back and forth to clean. maybe remove it from the board. a few days ago, I had a Marshall transistor guitar amp. no audio output, due to both the volume and gain pots being dirty. I removed them off the...