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  1. N

    Icom 718- ALC modification for AM possible?

    https://amfone.net/Amforum/index.php?topic=25323.0 A 9v battery hooked up as a Negative Voltage into the ALC port on the back of the radio, through a potentiometer.
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    Superstar 121 Talkback help

    You forgot to ground the junction of R197 (10k) and D80 (Anode, or non-bar end). This turns the Mute function off when in TX. Can switch on and off this way.
  3. N

    President Washington. Low AM/SSB power. Help?!

    This is a uPD858 chassis or MB8719 ? Edit: I found a schematic for Cobra 138XLR, which is also a uPD858. R180 is listed as a 56 Ohm at 2w resistor.
  4. N

    President Washington. Low AM/SSB power. Help?!

    56 Ohms?? Or .56 Ohms. It looks like an Omega after the 56, the K might be a temperature rating.
  5. N

    Thinking about a Lincoln II+ mod and hoping it can happen !

    The Lincoln II and other newer SSB radios (Madison, BC980SSB, others) use a 37 MHz PLL VCO range, (27 MHz + 10.695 MHz IF), I believe the Galaxy FC-347, Ranger FC-390 are designed to "see" either 16 MHz PLL VCO (27 MHz - 10.695 MHz IF) or possibly by soldering a jumper blob, "see" 34 MHz PLL...
  6. N

    Cobra 148 gtl 1993 philly version

    I believe so.
  7. N

    AM/FM/Car Stereo

    About 45 years ago, I got my hands on a JIL SSB add-on radio element for a JIL stereo, never could find the matching radio for it. I think it had a 24 pin round mic plug, and mode and channel selection was in the mic.
  8. N

    Cobra 29 LTD Classic Swing Mod

    JP36 feeds power to the Driver, not the Final, which is fed by L15.
  9. N

    Resque a Galaxy Saturn ept360011b

    Actually, not quite correct. Both Finals are on at the same time, in Parallel with each other. In SSB, the Power Regulator is hard clamped to feed 12v to the Collectors of the Driver and Finals. This gives the potential to be "modulated" in SSB to 30 or so watts Peak Envelope Power (PEP). In...
  10. N

    Yaesu 897

    Different "jumpers" https://ku4by.com/yaesu-857d-mars-mod/
  11. N

    HR 2510 missing Q 121...WHY?

    2 minutes apart. But, yes. VR114 is the adjustment, and it can be overadjusted to get the same "boxcars" effect as removing Q121. Typical bad info.
  12. N

    HR 2510 missing Q 121...WHY?

    Q121 is the AMC sensing transistor, that feeds the AMC/ALC circuit.
  13. N

    RM Italy KL 503 Crunchy

    Look at the schematic again. The RF output transistors (Driver and Finals) are "slightly turn on" when transmitting, there is no difference between AM (slight delay) and SSB (longer delay) on this amplifier. When no RF is sampled on the input (RTX), TR2 is "relaxed", thereby causing TR1 through...
  14. N

    Need the 10 crystal layout on the top side of a Kris 23+ cb tube radio

    Sams #45 ??
  15. N

    Magnum S680 29.090mhz only

    He probably meant 1 µH instead of 1 mH.
  16. N

    Schematic for Uniden 980SSB cb

    https://www.worldwidedx.com/threads/new-president-mckinley-ssb-radio.226877/post-660802 I posted the same manual from a different source a few years ago.
  17. N

    Schematic for Uniden 980SSB cb

    https://simonthewizard.files.wordpress.com/2019/04/service-manual-mc-kinley-us-12-24.pdf
  18. N

    Export Cb radio power plug upgrade

    The Cobra Plus series used the center pin for memory retention. Like cobra 29 Plus.
  19. N

    Cobra 25LTD Classic 10 meter mod?

    https://www.worldwidedx.com/threads/cobra-29-ltd-frequency-mod-counter.261815/post-763482
  20. N

    PLL Question

    The board that was hooked to the mic line and has a relay, looks like a Roger Beep board.
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