08-20-2012, 02:41 AM
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Join Date: Dec 2008
Location: Silicon Valley CA, Storm Lake IA
Originally Posted by The Bruce
Question... and this is assuming you're not bypassing the radio's preamp:
Wouldn't the current coming out of either a preamp or mixer need to be reduced in order to be plugged directly into the radio's microphone connection (mic level vs. line level)?
I'm worried that I might fry a radio.
Sure it can fry the radio's mic preamp if you have it too high to start with. Start by turning the mic gain on the radio down all of the way - first. Then, turn up the external preamp to the 10 or 11 o'clock position. Then slowly turn the mic gain on the radio up ever so slightly until you see the radio's meter moving when TXing. Be aware that moving it just a little bit will go a long way and too high may fry the radio's mic preamp.
One can also use an isolation transformer between the external preamp and the radio's mic input. This will also eliminate hum and isolate the signal between the radio and the preamp.
The whole idea is to get clean gain from a clean amp and mic; not to get the sound distorted/over-driven. Otherwise, the whole game is lost.
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; 08-20-2012 at 02:54 AM.