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TR793050.MOD
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1990-03-07
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2KB
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34 lines
CIRCUIT MODIFICATION FOR KENWOOD TR7930/7950 TRANSCEIVER
FOR PACKET/RTTY OPERATION
BY: WA4IXN
THIS MODIFICATION PROVIDES CONTROLABLE AUDIO OUTPUT TO PIN 5 OF THE MIC
CONNECTOR FOR SINGLE PLUG PACKET/ RTTY OPERATION.
REMOVE TOP COVER OF TRANSCEIVER AND CAREFULLY DISCONNECT SPEAKER LEAD
PLUG FROM "RX UNIT" BOARD. LOCATE PLUGS"J-13" ON THE RIGHT FRONT OF
THE "RX UNIT" BOARD AND "J-18" ON THE LEFT REAR SIDE OF THE BOARD.
NOTICE WHICH WIRE GOES TO PIN "8-M" ON "J-13" AND TO PIN #5 ON THE MIC
CONNECTOR. REMOVE PLUG "J-13" FROM THE BOARD AND LOCATE THE SPRING TAB
ON THE SIDE OF THE PLUG THAT HOLDS THE "8-M" CONNECTOR IN PLACE. USING
A SMALL AWL OR POINTED TOOL, PRESS THE TAB DOWN AND CAREFULLY PULL THE
"8-M" CONNECTOR FROM THE PLUG. WORK THE WIRE FROM THE HARNESS SO IT
WILL REACH BACK ALONG THE LEFT SIDE OF THE BOARD TO PLUG "J-18". USING
THE AWL OR SMALL POINTED TOOL, CAREFULLY SPREAD THE "8-M" CONNECTOR A
SLIGHT AMOUNT SO IT CAN BE FITTED LIKE A SLEEVE OVER ANOTHER CONNECTOR
OF THE SAME SIZE. LOCATE TERMINAL "AP" ON PLUG "J-18". INSERT THE
SPREAD TERMINAL "8-M" INTO THE TOP OF PLUG "J-18" SO IT FITS AROUND THE
TOP OF TERMINAL "AP".THIS IS A FAIRLY TIGHT FIT, SO USE CARE NOT TO
BEND THE TERMINALS BY USING TOO MUCH PRESSURE. ABOUT HALF OF TERMINAL
"8-M" WILL STICK UP ABOVE THE TOP OF TERMINAL "AP". THE LOWER PART
WILL BE FIRMLY SLEEVED AROUND TERMINAL "AP" INSIDE THE PLUG. DRESS THE
WIRE AROUND THE LEFT SIDE OF THE BOARD. REPLACE SPEAKER PLUG AND
INSTALL TOP COVER. PLUG TNC CABLE WITH PTT/AUDIO IN/AUDIO OUT/GROUND
CONNECTONS INTO MIC CONNECTOR AND IT'S READY TO GO ON PACKET/RTTY. NO
SOLDERING IS REQUIRED AND UNIT CAN BE RETURNED TO ORIGINAL STATE AT ANY
TIME IF NECESSARY.
Note: I haven't tried this, proceed at your own risk! WA2ISE