[ARC5] Motorola and GE Mic ID

[Dave Jackson]

Mark:

 

The GE is an amplified dynamic microphone- a dynamic microphone with a transistor amplifier built into the mic case.

 

The Motorola mic is an electret with built in amplifier and should work fine with the SCR-274N.  

 

GE mic:

http://www.repeater-builder.com/ge/lbi-library/lbi-30148f.pdf

 

PDF pages 19 & 24

 

Moto mic: 

http://www.repeater-builder.com/motorola/syntor/syntor-x9000/syntor-x9000-supplement-6880100w94-o-1986-02-17.pdf

 

PDF Pages 28, 35 & 55.

 

Also, the 560 ohm R101, 1K ohm R102, and 10uF C180 resistor/capacitor divider driven from appx. 9 volts seems to be common to most of the Moto transmitters starting in the 60s or there about.  Motorola originally used carbon mics with their transmitters, switching to amplified dynamic and then electrets.

 

Sincerely,

 

Dave WA4OBJ

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Thursday, July 06, 2017 6:14 PM
To: ARC5
Subject: [ARC5] Motorola and GE Mic ID

 

I picked up a few $1 hand mics at the local fester on Saturday in the hopes one would be an electret.    There are two of them that I can't determine if they're dynamic or electret:

General Electric 19c32027061
Motorola HMN1031a

There's a TON of info on the web,  but not one site will tell me if it's dynamic or electret....

This is for my SCR-274N AM efforts....

73 Mark K3MSB

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