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Galaxy 99v no transmit

Discussion in 'CB Radio Modifications' started by Road Block, May 12, 2018.

  1. Road Block

    Road Block Member

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    I have a galaxy 99v the transmit doesn't work, but pa and rodger beep does. It dead keys fine, but no modulation or swing. The modulation goes up normal and so does swing when I key up with rodger beep.I replaced D77 with 2 1n4148 in series aND tr38, still nothing. Any help would be appreciated.


     

  2. nomadradio

    nomadradio Analog Retentive

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    The trick with D77 is to stop a radio from keying up without a mike plugged in. Not quite the problem you describe.

    The answer to two very-important questions go a long way to narrowing down which one of several-dozen things can go wrong.

    Did you try a mike that you KNOW works on another radio? Or, taking this mike and seeing it work on another radio would tell us the same thing. Mikes break more often than radios, so your best odds start there. No need to mess with the radio if the mike is the cause.

    Does the carrier-power knob on the front make the carrier power on the wattmeter go up and down when you turn it?

    If the AM carrier is jammed at 30 or more Watts, and the knob does nothing, that would be a very important clue.

    73
     
  3. Road Block

    Road Block Member

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    I tried everything. I talked to a tech earlier, he said to check c128 just below ic4. If that cap goes bad, Rodger beep will still work but no swing when trying to transmit. When I get home from work, I will check it out and let you know if it was the problem.
     
  4. nomadradio

    nomadradio Analog Retentive

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    Or, you could try answering the two astonishingly-simple questions I posed.

    Your choice.

    73
     
    OldTech03 likes this.
  5. Road Block

    Road Block Member

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    Yes, I tried a different mic and the carrier power knob still works. Still nothing
     
  6. Handy Andy

    Handy Andy Active Member

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    What switch did you use for the rodger beep? Was work done to it?

    Reasoning, Echo board, power supply to it uses 8 volts from the main PCB as a "bypass" - it should be on all the time to keep the op amp audio buffering circuit working.

    When you lose audio - the audio from the mic routes to that board, goes thru a unity gain amplifier like a pre-amp whether the ROBOT or ECHO is on, or not, either way the echo works - always powered, if the 8 volts is lost - the Roger beep will work because it needs to send 8 volts to it. (Mic amp IC4 4558) - which turns on the Mic amp from the loop the Echo board and Roger beep supply. Do this test RB on, RB off.

    Else D65 and R162 by the Mic amp (4558 chip) might be the problem.

    To see if 8 volts appears on the Pin 8 (across from the Dot/notch pin1) - Do the test above to see if 8V gets to Pin 8 of the 4558 Chip (IC4). When RB is on or not.

    Then that means you lost 8 volts coming from the Band switch.

    (or bad rewiring and they misplaced a jumper or header criss-crossed...)

    :+> Andy <+:
     
  7. Road Block

    Road Block Member

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    Found the problem, it was D65. Thank you Handy Andy for the help. It's nice to get a level headed answer other than a snide attitude over wanting helpful advise. I guess some people just would rather talk down to others.
     
  8. Handy Andy

    Handy Andy Active Member

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    You're not the only one that feels that way.

    Hey, while you're here, that D65 thingy, the ORIGINAL design used a 100 ohm resistor to power the 4558 and all it's functions - now with all the extras you get with a Galaxy Radio (A Universe-al - ahemn.) radio these days they had to do the D65 so that the 4558 chip gets power nearly all the time now. As long as the TX line works.

    So now you can see why they "revised" each board design and slapped a new label on the package. DX or LX or insert favorite suffix here... NEW AND IMPROVED tends to get old real quick.

    So expect something NEW and IMPROVED (sic) from Galaxy/RCI once they figure out how to squeeze all the features listed on the side of box, into the box - correctly.


    Enjoy your weekend!
    :+> Andy <+:
     
  9. nomadradio

    nomadradio Analog Retentive

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    "I tried everything".

    Everything except D65, turns out.

    Glad to hear you got it fixed.

    73
     
  10. OldTech03

    OldTech03 Active Member

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    Well before you go getting all hurt and the crocodile tears start rolling let us see how this all went for you shall we?

    1) The end result is you got your radio working for nothing let me remind you had you sent the radio to most anyone myself included you would have ended up spending around $100 with shipping and repair costs. as it went it cost you nearly nothing!

    2) From what I can tell that is the only reason you signed up on WWDX so its possible we may never hear from you again at least until your roger beep quits working or something "NOW I'M BEING SNIDE"

    3) So when a learned specialist asks you a specific question it requires a specific detailed response not "I tried everything" because whether you like any of us or not we all know you have not tried everything or you would have fixed the radio without us.
    ================================================================
    Here is what I mean by specifics.

    YOU SAID: The modulation goes up normal and so does swing when I key up with rodger beep

    THEN THE TECH YOU TALKED TO SAID: I talked to a tech earlier, he said to check c128 just below ic4. If that cap goes bad, Rodger beep will still work "BUT NO SWING" when trying to transmit.

    Now in my logical world and 50 years of troubleshooting the statements above make no sense and literally contradict each other. So when we ask for detailed specifics we are not doing it to be SNIDE we are doing it because it's required to help you fix your radio for FREE I might add.

    Sorry but it gets old hearing people act as though they are somehow being victimized when getting something for nothing.

    And maybe I woke up on the wrong side of the bed?

    I'll apologize later when I wake up.

    ================================================================
     
  11. nomadradio

    nomadradio Analog Retentive

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    I guess one man's "snide" is another man's "helpful hint".

    73
     
    OldTech03 likes this.
  12. Road Block

    Road Block Member

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    Lol is it winter? Cause the snowflakes are sure out. Wow. Drama drama. How about let it go? I thanked the person that was being helpful. No need to cry to me about your input being useless. I'm going on with my day. This site is for information and help. Not the jerry springer show. Good day to you and 73s. Hope your day gets better for you and God bless
     
  13. Road Block

    Road Block Member

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    Wasnt talking about you. I was talking about nomad. You just jumped in and assumed. But it's ok. Your apology is accepted :)
     
  14. OldTech03

    OldTech03 Active Member

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    I know you were not talking about me and I was not assuming I was telling it like it is. I was just passing judgment on the way it all went down and since I'm in what could be considered a righteous position on this I will certainly accept your apology. Oh as for your snowflake comment it's nothing more than an attempt to make yourself feel better you were out of line and it has nothing to do with snowflakes. And as for this being a site for help it certainly is but not for people to trash others when it is there help they are seeking nobody on here is required to help you or anyone else we do it because we wish to do so and have the knowledge and share willingly.
     
    #14 OldTech03, May 21, 2018 at 6:13 AM
    Last edited: May 21, 2018 at 2:15 PM
  15. Road Block

    Road Block Member

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