home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Hacker Chronicles 2
/
HACKER2.BIN
/
062.SB852.DOC
< prev
next >
Wrap
Text File
|
1993-04-19
|
2KB
|
63 lines
SB-852
MC-46 DTMF Mic. With older equipment 1-25-82
The MC-46 DTMF (Dual Tone Multi Frequency, or Touchtone (TM)) microphone
may be adapted for operation with any VHF or UHF radio by changing the
supplied six pin mic connector to a five pin, four pin, or other connector,
as required. Radios not originally supplied with regulated, filtered B+ at
the mic connector need also to be modified to power the microphone.
The MC-46 standard six pin mic connector is part no E07-0651-05, and is
wired:
Pin 1 White Mic Output
2 Red PTT
3 Blue Down
4 Green Up
5 Brown B+ (8.5 VDC +/- 10%)
6 Shield
The Four pin connector part no is E07-0403-05. Radios built with a four
pin jack do not supply B+ to operate the mic, and must be modified to
deliver a constant source of DC to operate the mic and DTMF keyboard. Any
Kenwood product of this vintage will have a B+ line designated "C9" (Common
9V DC), wich is regulated, filtered, and noise-free. Rewire the mic as
described below:
Pin 1 White Mic Output
2 Red PTT
3 Shield Common Ground
4 Brown C9
Rewire the radio mic jack: pin 3 to common ground, pin 4 to C9.
Rewire the stock mic for pin 3 common ground. Otherwise, the mic element
will be returned to C9, instead of ground. Note this change on the radio
schematic.
The Five pin connector part no. is E07--551-05. Radios built with a 5 pin
jack supply correct B+ for a DTMF mic (originally designated MC-45, and no
longer available). Wire the mic as described below:
Pin 1 White Mic Output
2 Red PTT
3 Brown B+
4,5 Shield Common Ground
Mating chassis connectors are:
Four Pin E06-0403-05
Five Pin E06-0552-05
Six Pin E06-651-05
JEB/sh
(c) 82481TKC
Downloaded From P-80 International Information Systems 304-744-2253