Question about Galaxy Radios DX-66V Base CB Radio
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
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
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: http://customcbradios.com/SkyThumper-ST-65DX-Noise-Cancelling-Microphone-P640988.aspx 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
Problem may be solved by several methods:
Antenna mounted such that RF is injected into the mic or mic cord.
TURN OFF THAT LEENYER.
Posted on Mar 20, 2009
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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