Astatic D-104

The Astatic D-104 works very well with my Icom 746. I get a lot of good reports on the audio quality of my station. It's not the studio quality of some out there, but for  $30 from at a local swap it does the job well. The stock amplifier in the base of the mic is a must  to drive the 746. If you don't have one with the amp, there is a good project in QST for building one. 

 I used the existing 5 lead mic cable with an 8 pin connector. Notice I used the +8 volt DC from Pin # 2 of the 746, which eliminated the need for the 9 volt battery to power the amp. 

Mic Connector

Pin # 1 - (White) Mic Input

Pin # 2 - (Yellow) +8v DC

Pin # 3 - N/C

Pin # 4 - N/C

Pin # 5 - (Red) PTT

Pin # 6 - (Blue) PTT Ground

Pin # 7 - (Braid) Mic Ground 

Pin # 8 - N/C

The schematic was taken from the inside bottom cover of the mic.