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No modulation There is audio present in unit but does not modulate the carrier.

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Hello Rob55spiral, Most common malfunction in no modulation is the microphone. Swap out with a known working mic. #1 If problem is corrected, aquire a DVM and repair the broken cable connection in your microphone. #2 If still no modulation you have an internal componet malfunction. Please inform me of results.

Posted on Nov 04, 2008

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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

Apr 29, 2016 | Yaesu FT-857D transceiver

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Best audio settings for ft-857d


Default settings should work fine. What mode are you operating in? Voltage ! Swr? What microphone? Too many variables. Not enough info.

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This error arises when the PA module draws abnormal current. I had this problem because of a bad solder joint in the harmonic filter that is located directly following the PA module. Because of that, the PA sees a mismatch on the output. The VSWR sensor will not detect this because it is placed AFTER the harmonic filter. In my repeater this harmonic filter was inside a shielded module that was really difficult to remove. After I removed it, it turned out one of the caps in the filter was not soldered properly. I am not saying this will be the case in your repeater, it could be another problem but for me this solved the error code issue.

Jun 28, 2014 | Vertex Standard Two-Way Radios

1 Answer

FT-890AT yaesu transceiver has distorted transmit audio


Hi Ronald,

Could the problem be related by having the mike to close to your mouth? This is the most common cause of over-modulation/ distortion from the transmission end.

If you have the mike 3-6 inches from the mouth and speak in an even non loud tone, that would help sort that out. If this is not the source of the over modulation/distortion, then you may have a transmitter issue, which would require the unit to be serviced by a qualified radio technician or ham radio operator, if you know one willing to look at it for you.

I hope that this has helped you.

Cheers,
Peter

Dec 01, 2012 | Two-Way Radios

1 Answer

Uniden grant lt transmit and receives normally but when i key up on AM the AM power regulator gets hot quick i changed out the driver and final and replaced the regulator still does the same thing and it...


Sounds like a "short" if it affects modulation + power. Try to inspect board with magnifier for solder bridges, and bad resistors. Change a few resistors near back with new ones. take out slugs near back finals like L10 or L20's not sure if its same as Uniden Pc68xl. but try that. I found turning L19 up to top gave great Modulation. clip D9, Sread coils 1/16 inch in back. Try to get lower carrier. Carrier does not mean anything much. Modulation is what you need. With less Carrier it may cool down that chip. It may be too wound out.

Mar 26, 2011 | Uniden GRANT LT 2-Way Radio

1 Answer

Fram my radio gp338, the audio becomes slowly goes


if when you are transmiting your voice level is falling down in the others radios, this is a modulation problem, try with an audio accesory if you voice level or modulation level keeps constant your radio need to be repaired. if your problem is when you are receiving a communication, may be the speaker needs to be replaced

Jan 02, 2010 | Two-Way Radios

1 Answer

INTERCHANGE MODULE


I'm gonna go out on a limb here and assume you are talking about the band modules, right? If so it will accept some in the 6m,2m,and a couple of the 70cm bands. The model numbers I know it will accept are as follows: FEX-767-2,-6,-70A and -70B. If your module is one of these they are interchangeable. BTW, all of these modules are presently discontinued I'm sorry to say. Hope this helps!

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1 Answer

Moto T5710 Disassembly - Transmits Carrier Only. No Modulation.


Hello bwilliam. Batteries can give you a false reading. Check your batteries under load. Good luck.

May 22, 2008 | Motorola T5710 (22 Channels) 2-Way Radio

1 Answer

Having Trouble Receiving Through"TPL"


Are you sure that you are using the exact RX Frequency? is the radio in 25Khz if this radio is working on 12.5Khz with the IF filters changed to work in narrow band (12.5) could happend this.
Do you know if the repeater is on parameters mostly of the cases when an over modulation is received this will cut the PL modulation for short periods.
If the radio transmit over modulated could "erease" the PL modulation for short periods.
I think this radios should be checked all the Tune parameters to make sure is ajusted properly.

Good luck

Dec 17, 2007 | Motorola HT1000, MTS2000, MTX8000/9000...

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