[Elecraft] microphones

[Don Wilhelm]

RC,

No, they are not interchangable.
The impedance is the problem.  The unamplified D-104 (and other Astatic 
crystal [or ceramic] element mics needs a high impedance to work into 
and sound good.  The K2 and K3 have a low impedance input.
If you have the amplified D-104, then it will drive the K2 or K3 just fine.
For the unamplified version, some have stated success by putting a 47k 
to 1 megohm resistor in series with the AF line.  I use an FET in the 
base of my D-104 to change from high impedance to low (my D-104 needs 
bias to power the FET).

One way to convert the microphone is to discard the original element and 
replace it with an electret element (which needs bias just like the MH2 
microphone).

73,
Don W3FPR

On 6/22/2013 12:00 PM, Robert 'RC' Conley wrote:
> The Elecraft MH2 is a condenser microphone
> The Astatic is a crystal microphone
> A dynamic microphone
> are they interchangeable
>