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2510 on ssb

Discussion in 'CB and Export Equipment and Accessories' started by 190, Jun 20, 2009.

  1. 190

    190 Active Member

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    ok, i got 2 bone stock hr-2510s. only the channel expansion mod done.nothin else. when i talk on side band after i quit speaking (while still holding the mic key down.) the radio will hold a small carrier about 1/4 of the peak watts.???? wtf. if i let up on the mic key the meter drops to zero watts. when i key back up its on zero till i modulate. stop talking while holding down the mic key and small carrier stays till i unkey. its almost like its on am. both of these stock radio do this. the doc tune 2510s i got do not do this. is this some factory thing to prevent the total loss of carrier on ssb. ive tied different mics. mic gain clear off or down and it still does this. ONLY IN THE STOCK RADIOS.


     

  2. Robb

    Robb Yup

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    Needs a tune-up.
    There is a pot on the board that adjusts the carrier balance for SSB. I'll bet that on either LSB or USB - one will be OK. If one is OK and the other isn't; then the carrier balance is out of sync. You can DIY - but if you aren't aquainted with the board and don't have the service manual - and you are squeamish about it - then forgetaboutit...Send it to Doc, Doug, or Sparky...

    Two cents worth...
     
  3. 190

    190 Active Member

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    rob, tried the radios ob upper side band to see if it was like you said. same thing. it will modulate to about 22 watts then drop to about 10 watts till i let clean off the key. both of these stock radios got about a 9 watts dead key on am. ya, ill send them to doc before i start messin with stuff.
     
  4. 190

    190 Active Member

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    ok, did some trial and error. just bought a new texas star dx500. took the amp out of line and the radios stopped this wierd carrier on ssb. drops right back to zero like it should. i run a alpha delta antenna switch backwards to run more radios. i had the amp set up where it comes out of the antenna switch to the meter to the antenna. hooked my radio up directly to the amp to the meter and it funtions as it should. wierd but i guess anything can happen. guess ill just use it with no antenna switch.
     
  5. mackmobile43

    mackmobile43 Jock Supporter

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    Try turning the mic gain down a bit, maybe feedback issues/
     
  6. 190

    190 Active Member

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    tried that MACK.didnt work. took the antenna switch out of the mix and works like a charm.
     
  7. mackmobile43

    mackmobile43 Jock Supporter

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    same difference, you have junk in the trunk. stray rf is feedback
     
  8. Switch Kit

    Switch Kit Active Member

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    What kind of switch box is it ? I've seen cheaper type switch boxes cause this. In many cases , a better built quality switch box won't cause this problem.
     
  9. mechanic

    mechanic Active Member

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    I had read a post somewhere that there is a faulty trace near the finals on some 2510s. The cure was to remove one or two screws near the finals that hold the board to the chassis heat sink. Then hold the board with hot glue. There was something about the proximity of ceramic capacitors on the trace side of the board.....
    This has not been confirmed but Rogerbird would know best....

    mechanic
     
  10. 190

    190 Active Member

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    alpha delta antenna switch. switchkit. im only running one radio at a time now anyhow.
     
  11. KG5FBR

    KG5FBR New Member

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    Pesky feedback you cannot hear. A trick that worked for me is having a good grounded wire, strip about 4" off one side, and wrap that around a pl-259 somewhere in your transmission line. Not right at the radio, but maybe after an antenna switch, amp, meter, whatever. It also dropped my stray SWRs. A phenomenon called "ground loop feedback". Just my 2 cents on a six frickin year old thread! hr2510.jpg
     
    wavrider and RatsoW8 like this.
  12. RatsoW8

    RatsoW8 Supporting Member, W9WDX ARC Member - WD8T

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    Now that's funny :)
     
  13. Road Squawker

    Road Squawker Sr. Member

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    Be Nice,..[​IMG].

    ... and , yeah, I also noticed the date about half way thru the thread,..... and was wonderin too
     
  14. RatsoW8

    RatsoW8 Supporting Member, W9WDX ARC Member - WD8T

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    I didn't notice at all until KG5FBR's last line..lol
     
  15. wavrider

    wavrider W9WDX Amateur Radio Club Member

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    dunno if it was just the 2 cents or the six a fricken but I liked it(y)(y)(y)
     

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