[Boatanchors] KLM multi 2700 - sub auduble tone addition question

[Glen Zook]

Do you want to add CTCSS decode to the receiver or do
you want to be able to use the rig with many of the
repeaters which now use CTCSS?  Most repeaters that
use CTCSS do not transmit a tone but do require CTCSS
to open the repeater.  Almost all repeater users do
not add CTCSS to the receiver but just add it to the
transmitter.

The correct place to add a CTCSS oscillator to the
transmitter is at the wiper of the deviation control. 
You do NOT want to add CTCSS in the microphone
circuit.  By injecting CTCSS at the wiper of the
deviation control you bypass the low frequency
filtering of the microphone circuit and this allows
the tone to be fed directly into the modulator without
any distortion.

Glen, K9STH


--- Greg Mijal <bluebirdtele at embarqmail.com> wrote:

I've putting some older VHF gear back in order lately.
 Last week was a Clegg Thor 6.  This week it's a KLM
multi 2700 all mode 2m/10m rig.  I want to add a
subaudible tone board to the discriminator but don't
know exactly where to wire it to without a schematic. 
Can anyone point me in the right direction on the PCB?









Glen, K9STH

Website:  http://k9sth.com


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