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E. F. Johnson
Programming Cable Information
Compiled by Mike Morris WA6ILQ
This section is paraphrased from a posting that Pete N2MCI made on the EFJ yahoogroup:
You will need to build a programing cable. The schematic can be found here. Pay careful attention to the drawing as Johnson numbers the microphone jack pins very different from Ethernet. You can cheat and buy a DB-9 (NOT A USB VERSION!) Kenwood KPG-4 programming cable (under $10 on ebay) and then make a pinout changer - a 6-pin screw terminal RJ-12 jack wired to a stub of a common 8-pin RJ45 ethernet cable (and I'd use a stranded ethernet cable rather than a solid one).
|Programming cable pinouts|
|Kenwood mic jack||EFJ pin||86xx Function||EFJ pin||96xx Function||EFJ pin||71xx Function|
|2||GND||2||GND||3||GND||2, 4, 7, 9||GND|
|3||PTT / TXD||8||TXD||10||TXD||3||TXD|
|6||Hook / RXD||1||RXD||13||RXD||8||RXD|
Besides the pin numbering, there is one little quirk about the EFJ 86xx programming cable... The plug that goes into the microphone jack of the radio is a special 8 pin RJ-12 made by Virginia Plastics and not the normal 8 pin RJ-45... You can use a 8-pin RJ-45 but you have to take off a few thousands of an inch off each side.. I use a a grinding wheel to take most of the excess off, and use a hand file to fine tune the fix... It's not critical as the spring tab latch centers the plug... If you don't have a grinding wheel you just to get to do more filing.
Here's a description of the mike jack pins and the wire colors used with their 9800
RPI programming cables:
Radio Mic RPI Programming Cable
A--- Orange >---RxD
1--- Black >---GND
2--- Red >---MIC AUDIO OUT
3--- Green >---HANGER
4--- Yellow >---20V PROG
5--- Blue >---BATTERY
6--- Grey >---RX Audio IN
B--- Brown >---TxD
By the way, the Kenwood KPG-4 and the KPG-46 programming cables are the exact same unit except for the RJ connector on the radio end of the cable. The KPG-4 has a 6-pin (RJ-11 / RJ-12-style) connector. The KPG-46 has an 8-pin connector (RJ-45 style) and the center 6 pins are wired the same and the outer 2 pins are not used. So if you have a KPG46 on hand you can make the same type of adapter as described above by using a KPG46 and an RJ45 jack rather than a KPG-4 and an RJ12 jack.
Here are two programming adapters/cables for the Challenger series:
This page split from the main page 16-Nov-2011.
This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by multiple originating authors and Kevin Custer W3KKC. All Rights are Reserved, including that of paper and web publication elsewhere.