I used a 3K carbon comp for no reason other than that it was the most
suitable value that came out of the junkbox when I reached in for a
'pinch' of resistors. :-) It worked fine for the Icom HM-12 microphone
that I was trying to use.
73, Dale
WA8SRA
Brian Lloyd wrote:
On Sat, Sep 4, 2010 at 7:28 PM, Dale Boresz <[email protected]
<mailto:[email protected]>> wrote:
"I wonder if I can build a new interface cable with an external
power source. With minimal current drain a 9v battery should
easily last a contest weekend. "
Al,
I did exactly that when I was trying to get an Icom hand mic to
work w/ the 1500. In my case, the connecting cable was homebrew
anyway, so adding a 9v battery clip was easy - and it worked
great; the tx audio cleaned right up. Also, that battery will last
a lot longer than a weekend!
It probably means you have the value of the bias resistor wrong. I
normally use 220 ohm but if I am being picky, I will adjust it to try
to get the mic voltage and output swing I want. +5V is a little low
but should still work.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
[email protected] <mailto:[email protected]>
+1.767.617.1365 (Dominica)
+1.931.492.6776 (USA)
(+1.931.4.WB6RQN)
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