klm 2700 need to put in tone board help please

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Roy Best
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Joined: Fri Jan 21, 2011 8:14 pm
Location: rapid city s.d.

klm 2700 need to put in tone board help please

Post by Roy Best » Fri Jan 21, 2011 8:21 pm

I have a klm 2700 and I need to put a tone board in have sent for a te-32 tone board and will be in soon but they don`t list this radio and I need help to know where to hook up the tone board if anyone can help thanks so much, 73`s Roy kcondv

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Joined: Fri Jan 14, 2011 9:56 am

Post by KE3W » Fri Jan 21, 2011 9:21 pm

FWIW I found a PDF file on the TE-32 at http://www.com-spec.com/insheet/te-32.pdf
Last edited by KE3W on Fri Jan 21, 2011 10:13 pm, edited 1 time in total.

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Post by WB2WIK » Fri Jan 21, 2011 9:29 pm

You can install the CommSpec tone board in a MULTI-2700. There's really only three connections: +12V, ground and audio out, which connects to the center terminal of the deviation control.

From the CommSpec instructions which apply to the TE-32 or the SS-64 (note there is one difference in the color of the audio output wire, and it's noted below):

Installation of the SS-64 should be done by a qualified two-way radio technician. When installing the SS-64, be careful not to twist or bend the printed circuit board as this can damage the surface mount components.
In addition, use static protection techniques while handling the unit.
Be sure that ALL power is removed before installing or programming the SS-64. The following paragraphs describe each of the external connections on the SS-64.

This wire should be connected directly to a filtered source of continuous positive DC voltage in the range of +5.0 VDC to +28.0 VDC. This connection should be made “downstream” from the power switch, and the power supply filler components in the radio set. If a regulated source of DC voltage is available, it may be used, using a quiet and stable source of DC voltage inside the radio set wilt reduce the possibility of picking up power supply noise. You may also use keyed +V as the SS-64 starts encoding in less than 10 milli-seconds (if Reverse Burst is NOT needed).

The Ground wire should be connected to a location inside the radio set which will supply a DC power ground return to the SS-64. To eliminate ground loops and power supply noise, the ground return to the SS-64 should be the same power supply ground used in the transmit audio stages.

CTCSS OUTPUT (YELLOW WIRE - PIN 3) This is the WHITE wire on TE-32
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.
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-64 is low 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 10K deviation pot. In this case, a 10K 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."
73 de Steve WB2WIK/6

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