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Cobra 2000...D-104 mic..Got a report of radio cracklin..Has good modulation on AM but Poor Modulation On ssb.Factory mic works good on both AM and ssb.The VR11 ssb alc has no affect on the modulation on ssb..

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  • Andy Beck May 15, 2010

    Thank for you help..

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  • Master
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AM is always worse than FM for "crackling noises" try using some WD-40 on your gain pots.

Thanks for using FIXYA

Posted on May 15, 2010

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Yaesu 857D very poor audio out on SSB.


Dbl check your swr in am mode.. Ch your ssb power and mic gain default is 50 on both on hf .. If you use the mh-59 you will need to reduce the mic gain to 35 and it needs to be set for remote mic in the menu. Also the ssb needs to be set 2.5k wide with the ssb carrier zeroed both tx and rx

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Why no modulation in transmit mode?


Without seeing it I would guess (and it's only a guess) that maybe you have a broken microphone wire. If it's a factory mic the most common place for it to break is right up from the mic plug. Factory cords are not flexible, their really stiff. We could really use some more information. Mike

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Where can I find a new replacement modulation transformer for a cobra 29 ltd classic?


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Modulation sounds bassy!!!


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Apr 12, 2009 | Cobra 29 LTD CB Radio

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Cobra 29 ltd modulation problen


You need to check the modulation on a modulation meter. Just because the meter doesn't peg, doesn't mean the modulation isn't working. Usally a meter pegging, means the swr's are too high or the meter is misadjusted. If in fact the modulation is low, their is a pot inside the radio (VR4) that will add gain to the modulation circuit. This setting is legally supose to be set by a qualified technician.
Good Luck
Ed Meshechek ( Radio Man )
NC Electronics
PO Box 1696
414 6th St.
Mills, Wyoming
82644
307-266-4675
wyoed1@aol.com

Nov 24, 2008 | Cobra 29 LTD CB Radio

1 Answer

No Modulation!!


Hi,

Most modulation problem could be traced to:
1. mic or the cable and/or the mic connector;
2. AMC (amplitude modulation control) - it's a single transistor that regulates modulation and occasionally has been known to clamped on the mic audio;
3. the AM/SSB switch - spraying with contact cleaner is a temporary remedy; and/or
4. audio amp - however if your receive audio is good, then this does not apply.

Hope this be of initial help/idea. Without a model number, I can't be more specific as to component(s) or PCB location but pls post back for any developments (or lack thereof) or should you need additional information.

Good luck and kindest regards.

Feb 09, 2008 | Uniden PC78ELITE 40-Channels Base CB Radio

1 Answer

President mckinly ssb/am model with mb8719 pll chip.


It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.

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