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My connex 4600 turbo was doing ok just not walking very well with a oil cooled aentena. i installed a wilson 2000 and a new astatic mic. now i have to turn my mike gain down or i have alot of sqeale. i tried the old asaic mic and it dose the same thing. i ues to have my mic gain turned to full. on reflection the aentena for chanel 20 is 1.3, on 1 it's 1.5 and on 40 it's 1.3. any help?

Posted by fxrs86ll on

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  • fxrs86ll Jul 15, 2009

    No, it's just a niose canceling typ Brand is a ASTATIC mic

  • fxrs86ll Jul 15, 2009

    The brand name is ASTAIC whitch was recemened buy the shop ibougt the radio from. i think it's a niose canceling mic. but was told not to use a noise canceling mic. so i' confused.

  • Anonymous May 11, 2010

    Did you buy a power mic?



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  • 11 Answers

It's probably a bad ground connection at the antenna. The coax shield needs to have a good ground (ground plane) or else you'll have RF feedback through the mic cable due to excessive RF traveling back down the outside of the coax and making the radio "hot".

Posted on Oct 10, 2009


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Will a connex 4600 turbo cb radio operate cool enough in a dash enclosure?

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I av a connex 4600 turbo and a astatic 636 mic on it when i turn the talk on it squeals bad how do u stop it

turn down the rf gain. If that doesn't work you may want to have some one install 2 .001 caps across the tx and the dx wires in the mic.

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Looking to buy connex4300hp for 150.00.think its a good deal but dont know that much about it.gonna run 18ft coax to wilson 2000 w/astatic do i set-up for best performance?=bands,knobs on...

A new unit goes for $280 range
then conversion to run cb freqency $30.
Tune-up $50 you should get 70 watts older units 90 watts newer units

As far as the knobs go
Band D with channel 19 selected this is 27.185 citizen band if you radio has had the channel expansion done other wise it is not accessible.
Select AM
10 khz switch should be off
mic gain know depends on the tuning of your radio and mic choice.
rf gain full clockwise best reception you will just have to play with this knob and the squelch to your liking
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Can only get out about two truck lenghts and then nobody can hear me. i just bought a brand new astatic mike, but that wasn't the problem, bought a new wilson 2000 antenna and that's not the problem...

Did they set the swr on the new antenna for you? check the installation of antenna system. make sure the insulator is ontop of mirror mount. Check SWR's.. use a dummy load on the coax and check it to make sure its ok..... if you had bad swr before you changed antennas the rf finals may be bad in the radio. simple $10-20 [email protected] a Decent shop. don't pay more than that. have them check the swr's they should do it for FREEEE!!!.. unless theres a problem like cables,mounts bad ie...also have the radio checked that should be FREE too to have it checked on a bench.. i don't charge unless theres a problem, and the customer wants it fixed. here in temple, tx hwy 95&fm93....

call or text if you need more help..

Astatic 636L mics $17.99
RK56 Mics $38.99
connex 3300hp $199.99

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2 Answers

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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Bad RX/TX Transistor? I don't have a diagram for the 4600. Sorry!

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Hi there!!

The Connex 4600 Turbo is a very sensitive radio these radios don't work good at all with the stock microphone! The best microphones are the RK-56 and or the Astatic 636L which most people use and you shouldn't get any squeal. And make sure if that you are using an external speaker get it as far away from the radio as you can facing away from the radio so it wont feedback. As far as a Mod kit there are several ways to modify the radio which most are pretty hard and drawn out. but the most easy that used to be used is as simple as a diode placement in the right place which is old school but still works good. You must be very careful as if you are to slightly touch the wrong points the radio could be destroyed and no longer work so caution is to be taken if you don't know what you are doing please don't try it on an expensive radio!! If you want more info on the mod e-mail me

never the less a Modulation kit or modification wont help your Receive it will only help your Transmit signal!!


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i have the same radio turn talk back off and there is enough power ull have talk back through you trucks radio speakers and it needs to be hooked up to the battery with at least 12ga wire

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