[Elecraft] Re: Mics for K3

[Robert Brigham]

Bob et. al..,
I am in the process of matching my D-104 to my K2 with
a darlinton transistor emitter follower circuit to
bring the roughly 250kOhm element impedence down to
about 600 ohms. Got it to work fine with the  K2
running QRP, but everything goes
to-hell-in-a-handbasket once I ramp up the power. I'm
powering the circuit off of the +5Vv pin the mic jack.
I've grounded the mic jack shield and inserted a
cap+toroid inductor filter on the +5v. This got the
QRP version on the air, but I clearly have to do more
when running 100w. So, if you can get the job done
with just a transformer, that may be the simplest
solution [and if you locate a good transformer forward
the part number :) ].
Rob
KC6ROC
K2/100 #5924
--- "Robert C.Abell" <abellve3xm at sympatico.ca> wrote:

> Attn. DW Holtman,
> 
> I too have and use the Astatic 7077 mic for my Drake
> TR-7 and have a D-104 for my 
> Collins KWM-2A. I doubt that they will work with an
> Elecraft K3. They are high impedence
> mics and the K3 would need a low impedence mic.
> You may be able to hook them up through a matching
> transformer however.
> IMHO.
> 
> 73, Bob  VE3XM
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