For pinouts and wiring for digital connections to rigs, I often refer to the microham products listing and go to their cables section for a given product. They show the TS850S as similar to older Kenwood rigs such as my TS-440S, except the 440 did not have FSK. Can you find a separate RCA phono jack on the back of the rig for the FSK keying connection?
http://www.microham-usa.com/Products/MK/Cables/DB37-TS-6.pdf It has been over 15 years since I wired up a Kenwood 13 pin DIN for my Kenwood TS-440SAT but this is from my manual and what the pins do: 3 - Data output - Output level is fixed regardless of the AF control setting. Output voltage: 300 mv or more at maximum receiving input with a 4.7 K ohm load 4 - Grounding - the shielded wire of the audio output terminal is connected here 8 - Ground 9 - MIC mute - Signal output from the MIC jack is muted. Grounding mutes signal 11- Data input - Input terminal for data communication. In SSB, MIC gain can be controlled by the MIC control. Input voltage: 500 mv or less (SSB: Voltage starts deflecting ALC. FM: Voltage providng + and - 3.0 kHz modulation ratio.) 12 - Grounding - The shielded wire of the audio input is connected here. 13 - Standby Standby terminal Grounding transmits. I don't know if the 870 series has additional AFSK line in and out RCA phono connectors as does the 440, but I made note to myself that the Data Input on the 13 pin DIN jack ... "appears that this input is after the mic am/processor IC4 so needs much more voltage than the AFSK IN Jack which is parallel with the Mic Input." It was very convenient to break out the wiring to a small minibox that had a toggle switch that enabled me to ground pin 9 and thereby mute the microphone circuit and avoid accidental transmission of mic audio on digital transmissions. You might want to take a look at KE4MOB's website on the MFJ1278B and FSK issues. I assume you will be using the header jumper in the 1278 to run FSK which is much better than attempting to use the internal AFSK generator. http://www.qsl.net/ke4mob/ 73, Rick, KV9U kc7fys wrote: >Howdy, >I need some specific instructions on wiring up this cable. I have the >5-pin DIN for the MFJ, but don't have the instructions for wiring up >the FSK and 13-pin DIN. >Thanks for tips. >Jonathan KC7FYS > > > >
