[ICOM] dynamic mike

[Gary P. Fiber]

Jack,

The mic amplifier gain may be an issue but further there is a simplex voltage
applied to the mic pin, generally + 8 VDC.  Most dynamic mics I have 
seen are a
direct DC coupling from Mic input to Mic ground, there may be an issue 
shorting
the +8 VDC to ground with little DC resistance.

Some of the Icom rigs do have a capacitor in the ground  mic audio 
ground so it
is signal not DC ground but I do not remember about the IC-775. A check of the
schematic will tell though.

I am sure during my time at Icom I helped a few connect up dynamic mics but
can't remember about the low drive issue. I think Astatic makes an amplified
base for their mics which should solve that trouble if it is one.

Gary K8IZ



> Hello All:
> I am new to the Icom Reflector.
> I would like to use a Astatic model DA dynamic mike on a IC-775-dsp rig.
> I am told that there is not enough gain in the rigs preAmp for a
> dynamic mike.Is this correct ?
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>



Gary P. Fiber K8IZ
GROL PG-19-6691
Washington State Resident