Question about Kenwood Radio Communications

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Why do i get a loud squeal/feedback noise when transmitting from a TK-3230 radio to a TK-3400U4P?

I get the noise when the volume on the TK-3400 is set at 1/4 of the range or above. I continue to get the noise at distances of 15 to 20 feet. Any ideas?

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  • 623 Answers

Already answered - it's simple feedback. Turn the volume down.

Posted on May 04, 2014


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Posted on Jan 02, 2017

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SOURCE: kenwood tk 3102 and autocom


with the indulgence of IrishDruid and many thanks to micromaster....

The radios are compatible since as you posted "...both radios work perfect by themselves..."

Based on your post, I would suspect that the transmit audio line from the Autocom to the mic input of the Kenwood TK3102 is faulty/not connecting right. All others (receive audio and PTT) are wired correctly. This is inline with what IrishDruid has initially posted. Additionally, the Autocom is also working since it kicks the PTT through its VOX (voice activated relay) and there is transmit (albeit the TX audio) or manual PTT.

Additionally, there are some 2.5mm connectors that are just a bit short of what Kenwood requires.

Posted on May 18, 2008

  • 18 Answers

SOURCE: Kenwood TK-3101 is sensitive to Motorcycle RF

It would be nice to use the bike electrical system for power and not worry about battery juice. The TK 3101 is PC programmable so you could try and put in PL Tones.
They are like a way to filter radio signals out but that is different from the whine you are probably getting over the wiring.

Posted on May 28, 2008

  • 1 Answer

SOURCE: ICOM IC-A6 Feedback type interference

The problem is caused by the microphone preamp in the headset demodulating the AM transmission. Sordin MSA headsets also have the same problem. What you require is a headset with no electronics in it and a dynamic microphone.

Posted on Jul 01, 2009

  • 1654 Answers

SOURCE: Motorla Xtn446 - Kenwood Protalk Dosent Transmit

One or both of your radios have PL ( aka private line, tone code, interference eliminators) activated. Here is a link to a link which contains the XTN446 manual(s). Click on the "support" tab to see the list:

First I would try setting the radio's CODE to off (usually zero) and see if that solves the problem. Otherwise, you'll either need to experiment, or find a user guide for the Kenwood. (You could try posting in the Kenwood forum.)

Best regards.

Posted on Jan 16, 2010

  • 3 Answers

SOURCE: Yaesu Ft-60R with Kenwood TK-3107

ok guys!! i have gold for your prob huhuh
go to this website and u can get anything about all model TK

Posted on Feb 27, 2010

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Why is humming coming from speaker when mic is keyed?

this is strange as most times if a proper transmit key is depressed , then the radio switches from receive to transmit , the mfg know this would cause some great squeal from receiver /transmitting so close to a receiver so the part that is the receiver is muted to keep this from happening , id say there is some fault in the part that does this muting of receiver

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Kenwood Protalk tk-3200U8P will receive, but not transmit. When talk button is push a loud beep will sound. Any suggestions?

Assuming it is programmed correctly, it is a weak, undercharged or bad battery. Transmit takes a lot more power than receive. A beep or no transmit, even if the Transmit light comes on can still mean the battery condition described.

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I can transmit & receive on all channels but when i try channel 40 i get a loud squeal from speaker

dont talk on ch 40 or if you do then keep your mic away from the speaker.Its causing feedback through the speaker

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Loud squeal/feedback noise when transmitting from a Kenwood TK-3230 to a TK-3400U4p

If you're close enough to hear the receive on one radio while transmitting on the other, it's good old-fashioned feedback. Turn the volume down on the receiving radio.

Jul 11, 2013 | Radio Communications

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When transmitting it has a loud squealing noise, it is so bad that i had a problems getting a radio check. HELP

What you describe sounds like feedback ... a contition that exists when two radios are on the same freq and close enough that the signal is re-transmitted as it travels from the speaker of one to the keyed mic of the other. This is a shot in the dark ... can this be the condition you are experiencing?

Thanks for visiting FixYa.comm today.

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I have a Connex 4600 Turbo mounted in the headliner of a W900L Kenworth using Wilson 2000 twin antennas and a RK56 mic. When trying to use the "talk-back" feature all I hear is constant...

Strange. You shouldn't have a squealing problem with an RK56 noise canceling mic.

Unfortunately there is no way to change the volume of the talkback. Its too loud. The only solution is to turn the mic gain down.

The only reason you need to have talkback on is to check your audio. Make sure the echo is good and what not. After that you really don't need it on. So turn down the mic gain, then check the echo, then turn off the Talkback and turn the gain back up.

The squeal is feedback from the talkback being to loud and being heard by the mic. So the only way to solve it is to lower the volume of the talkback, (Which is not possible in this radio) lowering the mic gain(which lowers your audio level) or turning it off.

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Hisses/squeals when transmitting

Check the input voltage into the radio while in transmit. The voltage maybe dropping as you go into transmit which causes it to drop into receive. That in turn allows the voltage to come back up. With your finger still on the PTT it tries to transmit again, etc. This could cause a feedback squeal and other symptoms.

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The squeal in this model is a famous problem. If you look at the circuit board, you'll see there are a few places where it looks as if someone kinda forgot to put in a ground screw -- even to the point that there are threaded holes in the casting just begging to be filled by the little screws used elsewhere nearby. Take 3 or 4 similar screws, put them in the remaining holes, and make sure all (including the existing ones) are snug. It seems there just weren't enough ground points for all the RF swirling around on the solder side of the board, so there's a bit of RF feedback on this radio. And as long as you've got about 16 amps of clean DC, you're fine; the power leads are correctly fused at 20 amps. BTW, the power amp module in this model is really only spec'd at 144-148; if you're running an odd "MARS or CAP" split, the PA brick can get way unhappy. HTH, -- Barney --

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Its most likely was programmed with a rx but no tx. Meaning it can recieve but not transmit, you can fix this with the programing software.

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Midland 48 plus sounds quiet when i speak to people even at close range if i turn my mic gain up more than a quarter all i get is a whistle noice whenever any one speaks

Possibly, sounds like old fashioned feedback. It's when your radio squeals loudly when you are standing too close to the person that is transmitting. If the units in question were set up properly from the factory, feedback should be limited to only when you are standing right next to the person, and stopping when you get a couple of feet away. Sounds like your group of radios just need to be tweaked on the service monitor.

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