Attaching A Pc Microphone; 1/8" Or 3.5Mm Stereo Jack For Microphone Input - Apache Labs ANAN-100/D Manual

Attaching a PC microphone

Updated 10/31/12
Hermes / ANAN-100/D+ SDR's have a 1/8" or 3.5mm stereo jack for microphone input. The following
instructions outline methods for interfacing PC microphones to Hermes / ANAN-100/D. Garden variety PC
microphones can give surprisingly good results when used with the P*SDR or external mic equalizers. Since I
don't have a Hermes / ANAN-100/D+ I am unable to test these instructions with a working radio. Use at your
own risk.
These instructions assume the user has properly installed and configured a P*SDR version compatible with
Hermes and installed the appropriate Hermes firmware for this version.
WARNING:
The FPGA and other components on the Hermes PCB can be damaged by Electrostatic Discharge (ESD). When
handling the PCB, you should take ESD precautions (i.e.
use a work bench with an antistatic mat on it and wear a grounded wrist strap).
WARNING:
Remove DC power before opening housing to change jumpers. Failure to remove DC power could result in
damage to circuit boards.
Adapting typical (NON-USB) PC microphone for use with Hermes / ANAN-100/D+:
1. Obtain PC type microphone equipped with 1/8" or 3.5mm mono
plug.
NOTE: USB terminated microphones will not work with these
instructions.
2. Obtain Radio Shack RS 274-375 dual 1/8" or 3.5mm mono jack
to 1/8" or 3.5mm stereo plug adapter or equivalent.
NOTE: Do NOT use a 1/8" stereo Y adapter!
3. Remove DC power from Hermes / ANAN-100/D+.
4. Ensure that Hermes Jumpers JP4, JP5, and JP6 are set for
intended use.
Open Hermes / ANAN-100/D+ housing using a grounded wrist strap
and an anti-static mat. Locate the following jumpers and
change as needed:
JP4, Mic audio on Tip, jumper pins JP4-2 and JP4-3
(Hermes Default).
JP5, Electret mic, Do not install jumpers (Hermes Default).
JP6, No PTT, Do not install jumpers (Hermes Default).
or, Alternately,
JP6, Separate PTT switch connected between stereo plug Ring
Revision v1.8 April 23, 2013
Apache Labs ANAN-100/D
37 of 70 authors N9VV and KC9XG