It sounds like you either have a mis-matched antenna, a poor antenna connection, or your radio is too close to the antenna. Try moving the radio further away from the antenna.
SOURCE: galaxy dx-66 squeals on talkback
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.
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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
SOURCE: Galaxy 95T
check SWR's check to make sure ALL coax connectors are tight. and if still doing it. may be loose connection in board. but the export style radios go crazy like that when coax is loose or have bad grounds. due to there floating ground circuit design. there not the same as a cobra were its case is ground.
SOURCE: my galaxy dx 66v when
make sure the mic connector board is not touching anything inside. if it is not.. below it is a diode for the TX/RX.. replace it with 2 914 diodes and should work again.. 99% of the time..
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