Heathkit GH 12A Schematic
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Page 1
instruction:
FOR THE
@
HAND-HELD
MICROPHONE
Model GH-12A
INTRODUCTION
The HEATHKIT Model GH-lZA Hand-Held Mi-
crophone is a high impedance type, specially
designed for use with radio transmitters. It
features tailored response for voice communi-
cation and is particularly suitable for the SSB
mobile transmitters. The coiled microphone
cord and the mounting clip allow handy place-
ment in any installation.
The Microphone can be used with the switchbut-
ton for push-to-talk operation, or for VOX
operation if the switch is not used. Appropriate
connections should be made at the transmitter
end of the microphone coiled cord.
SPECIFICATIONS
TypeOfElement.....................
Sensitivity..........................
FrequencyRange......................
Peak Response Frequency................
Microphone Switch Rating. . . . . . . . . . . . . . . .
High impedance piezo - ceramic.
-57 dB; below 1 volt per microbar at 2500 Hz.
100 to 5000 Hz.
2300 Hz.
120 VDC at 1/2 ampere maximum.
PARTS LIST
DESCRIPTION
Microphone, with 8foot coil-
ed cord and clip
PART PARTS
N0. Per Kit
480-58 1
595-1059 1
595-I059
'lINTED m lL5.A.
Instruction-sheet
6'28~68
Page 2
INSTALLATION
Figure 1 shows the wiring of the microphone as
it is furnished.
" MICROPHONE l
ELEMENY can I
m:
RECH IRANS
|
|
l
l -_
1
SHIELD
BLK
4 /wm
.
l
I CORD
|
MICROPHONE CASE J
FIgure I
MOUNTING MICROPHONE CLIP
The microphone clip may be installed on the
cabinet of the transmitter or on the dash of your
automobile, as shown in the following illustra-
tions.
MICROPHONE
CLIP
CONNECTION 0F IONLV IHEI MICROPHONE
CORD WIRES AS FURNISHED.
Figure 2
Hz NUI /
#b LOCKWASHER 2323/
/
/®
MICROPHONE
CLIP
(DRILL 5/3?
DIA HOIESI
/
/ (DRILL 1/64
// DIA. HOIESI W//
Wm x A sum METAL W
SCREWS mun/4 smsws
DASH MOUNIINC CABINET MOUNTING
Figure 3
INSTALLATION WITH HEATH EQUIPMENT
Figure 4 shows how to connect the microphone
cord to an Amphenol connector #80MC2M. Use
this connector with Heath SB and HW series of
transmitters and transceivers.
Page 2
USE WITH OTHER THAN HEATH EQUIPMENT
The Microphone is wired for both VOX and PTT
(push-to-talk) operation. If you wish to wire the
Microphone for "PTT only," perform the steps
under that heading.
HEATHKITI