"Doug Davis" wrote in message ...
I have a Kenwood TS-711A. I bought the SS-64 tone encoder from
Communications Specialists at http://www.com-spec.com/ss64.htm
They don't have installation instructions for the TS-711A.

I have 3 wires to hookup:

Red: v+
Black: Ground
Yellow: Modulator

The first two I can handle but the yellow I need help with...

I just received the service manual and schematics today but I still can't
find the modulator.
Does anyone know where to solder the yellow wire for tone out?

Thanks,

Doug
N8DRD


Doug -

You can call ComSpec Tech support.
They have hundreds of Application Notes on file on file.
They are slowly moving these paper documents to the Internet web site.

SS-64 General Product Installation Sheet
http://www.com-spec.com/insheet/ss64inst.pdf

The second page of the SS-64 highlights the CTCSS OUTPUT (YELLOW) (PIN 3)
This output generates the CTCSS encode tone. The most common place to connect this line is just prior to the modulation stage in the transmitter. Typical connections would be to the center of the deviation pot. to the varactor diode in the modulator circuit, or to the manufacturer’s suggested connection point. This connection point can vary from radio to radio. [A schematic of the radio is useful]

Do NOT connect the CTCSS Output to the microphone input as the microphone audio stages will distort and attenuate the CTCSS signal. Since the CTCSS Output on the SS-6.4 is tow impedance, you may have to install a series resistor to reduce the loading effects of the CTCSS Output depending on the interface impedance. This is evident in the case of connecting to the center of a 106K deviation pot. In this case, a 106K series resistor will compensate for the impedance difference. In addition, a slight adjustment of the voice deviation may be required to compensate for the CTCSS Output circuit loading.

Com-Spec
426 West Taft Ave. Orange, California 92865-4224
Phone 714-998-3021 Fax 714-974-3420
Phone 800-854-0547 Fax 800-850-0547
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