[Elecraft] Astatic D-104 Adaptation to Elecraft

[KEN BROWN]

More on the Astatic D-104 -G. Heidelman, K8RRH
QST articles August 1999, p. 34, March 2001, p. 59
show circuitry that allows the D-104 to be properly loaded
while driving a rig from a low source impedance.
QST June, 2002 HINTS AND KINKS, P. 61 has more on this
adaptation of high impedance mics to low impedance modern rigs.
Figure 1- a  mic preamplifier for adapting a D-104.  A pot at
the output allows audio drive to be set precisely to prevent
overdriving.
Figuire 2- a circuit for adapting an ICOM using pin 1  Mic
in, and the 2N5484.  Both circuits use the 2N5484. 
Figure 3- Adapting the D-104 to transceivers with dc available
on a pin other than that carrying the audio. Rob Sherwood,
NC0B, Mike Tracy, KC1SX of the ARRL lab provided assistance and lab
tests.
George Heidelman,  K8RRH



Ken Brown N4SO
Mobile, AL  EM50tk
K2  S/N 3394
N4SO@arrl.net 


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