Question about Galaxy Radios DX-66V Base CB Radio

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Galaxy dx-66 squeals on talkback

My 66 squeals on talkback i have to cut the mic gain down to about 12 o,clock to stop it is there a way to cut down the squeal on talkback without having to turn down the mic gain so much

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  • Anonymous Mar 12, 2008

    ok thanks a lot ..i,ve actually got a astatic 636 mike somewhere if i can find it,will have more to ask you about on a galaxy 44 and mirage 88 when i get to them,thanks

  • Anonymous Mar 18, 2014

    I have a galaxy DX 939 with a D-104 the lollipop I can't even turn the talk back on without the thing squealing anybody have any ideas please help



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Timspur, hi. First off, using the talkback with a tuned Galaxy will give you problems, so you need to use a good noise cancelling mic like a RK 56, or Astatic 636. If your running an amp, that will only amplify the problem. Here is a mod if your comfortable working on your radio, to tone down the TB volume.
Talkback can become distorted if these radios have been "peaked," and there is no cure because the talkback just amplifies what goes to the RF section. Try adding a 470k ohm resistor from junction of C155/R207 to the junction of C187/R235 on the solder side of the board. This will also give you clean talkback on SSB and FM. Try different values of resistance to get the amount of volume you want. The less the resistance the louder the talkback will be.**
Hope this was what your looking for,, I know for a fact that the Astatic mics do help tone it down.
Let us know,,, Mechanic

Posted on Mar 12, 2008

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Being in radio's for 35 years, anytime you use "talkback" with just about any power mic, you will get feedback unless you turn the rf power down and/or turn the talkback down. I have a Mirage 66 that I use as my base rig because of the super loud audio (using an amplified D104) and a four stage linear. I have my talkback wired as a variable so I can adjust the loudness of the talkback WITHOUT LOWERING THE PERFORMANCE OF MY RADIO! Anytime you lower your audio, you lose output power (watts) because you have less swing. Example: with my talkback turned off, I can adjust my audio to 100% and I swing 400 watts. When I turn my audio down to 75%, I swing 250 watts. So the bottom line is don't run an amplified mic with talkback at all and but a noise canceling mic. Road King 56's are great mic's but for the same money, go to: and get the
SkyThumper ST-65DX Noise Cancelling MicrophoneIt is the best noise canceling mic on the market with 35% more audio than the Road King 56. Copy and paste the site I posted. YOU WILL NOY GO WRONG!!!
Thanks and good luck!
"WILDCAT" in Laurelville Ohio

Posted on Dec 30, 2010

  • Jerry Conners Dec 30, 2010

    I did forget to mention if you are running a power mic with talkback, you will have to turn down the mic gain, feedback (if variable), and or the rf power! My best solution is to minimize everything so you can hear how you sound with your talkback and THEN turn off the talkback and always run the RF power at the lowest power to get THAT SWING which is loud *** audio!!! Loud audio is swing and swing is also wattage and there you go! My Mirage 66 kicks *** and anyone within 50 miles of me knows it and they sure know me because they sure can hear me! LOL!


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Problem may be solved by several methods:

Re-install TR32.

Disable Talkback.

High SWR.

Antenna mounted such that RF is injected into the mic or mic cord.


Posted on Mar 20, 2009

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I have "talkback" installed on three of my radios and all talkback is, is a resistor soldered onto the bottom of the board. All you have to do is CHANGE THE EXISTING RESISTOR TO A SMALLER RESISTANCE. I'm NOT a tech and can't say which one but if I was you, I'd take it to a repairman/tech and ask him what size he recommends. Or you can try a "variable talkback" that limits the volume. CHANGE THAT RESISTOR.....SHE'LL WORK "JUST FINE".

Posted on Feb 16, 2009

Disabling Talkback Disconnect wire located in J15 no more squeals

Posted on Oct 09, 2008

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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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Do you have talkback installed? It my be too loud and causing feed back. Back the mic gain down if so.

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Another thing that can cause a hum, buzz or squeal is a faulty volume and or squelch knob depending on the radio.

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Turning down the gain on your mic will stop the squeal.

the squeal is cause by feed back from audio from the talk back being heard from the mic.

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