Have a TW4000A dual band 2M.70cm transceiver without a CTCSS tone encoder. Where and how do I add a CTCSS encoder like a Comm Specialist TE-12P encoder so that it will work on both the VHF and UHF bands?
The TE-12P is an old unit and is no longer being manufactured by Communications Specialists.
If you have any need to change the CTCSS tone, then you definitely do NOT want a single tone board. The TE-32 is a much better value. It does mount on the outside of the unit but does have all 32 of the most used tones available.
The correct place to connect the tone is to the "wiper" of the deviation control in the transmitter.
It appears that you would need 2, or ability to inject CTCSS at a common point (schematic needed)
in order to emulate the Kenwood TU-4C option. Communication Specialists never wrote a specific application note for the TW-4000a