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World of Ham Radio 1997
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 852
MODEL: MC-46
SUBJECT: MIC USEAGE WITH OLDER EQUIPMENT
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