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- Subject: 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" conn-
- ector 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".
- continued in file tr7930.1
- tr7930.1
-
- 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.
- the end! relayed by...n0kgx...gene
-
-