04-26-2009, 12:19 AM
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Join Date: Dec 2008
Location: Silicon Valley CA, Storm Lake IA
What did I finally do for this problem?
I tried one 470K ohm resistor; not enough.
Then I put two in series - still no dice. Then I put a 1M pot WITH 2 470K ohm resistors in series and it STILL didn't do what I wanted. Looking closer at this resistor mod; it is only good for reducing the distorting on the talk back circuit caused by a radio with more than 100% modulation = 'splatter'. NOT for adjusting the talk back volume.
SO - I put a SPST switch between the green wire at J15. If I want to adjust my echo level and depth, I have to flip the switch on the back so it turns the talk back circuit back on, turn the mic gain down enough (almost all of the way down - BTW), set echo/level, flip the switch back off, and turn up the mic gain.
Anyone have a better way? Fortunately, there was already a factory-made hole in the back of the radio that fit a mini SPST without any difficulty. But Galaxy really should have put an adjustable talk back volume on the radio. It is a pain in the butt to do it the way I did it - but at least I got it to work the way I need it to. I talked to the tech at Galaxy on the phone, and he suggested that I put a ferrite between the internal speaker and the board. I told him that it was audio feedback from too high a level out from the radio, and the sensitive D104/TUP9 just didn't allow me to get enough mic gain out of it to work on the air. He never did answer my email either, nor did his solution solve my dilemma. Mine works; and his didn't. Go figure - this guy must see this problem all of the time from people that have the DX99V and a D104 - and yet they offer no viable solution. I don't like the compromise I had to do to make it work the way it should. But I will keep the radio and keep my solution in place.
My Magnum OmegaForce has a feedback problem with my D104; but it also has a talk back volume to handle it the way that it should. Not knocking Galaxy; but why didn't they see that problem coming off of the drawing board?
BASE: Kenwood TS-2000, GAP Titan DX, Diamond X50A, Sirio SY27-4, and IMAX 2000.
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Sirio Z-180. Yaesu FT-8800R & Diamond NR-770.
Last edited by Robb; 05-01-2009 at 01:00 AM.