TR-851 tone mod
 

Hello,
I have a TR-851E (european version) and I'd like to add an internal
tone encoder
unit (self made) to be able to access the newcoming sseti express
satellite.
The problem is that the internal tone unit is activated only in the A
version,
while in the E version the 1750 Hz burst tone is active. I didn't want
to lose
the 1750 Hz burst and I played a bit with diode configuration on the
control
board but haven't find a configuration that enables both the tone unit
(with
func + voice keys) and the 1750 Hz burst (via the "tone" key).
Do anyone know how to modify the radio to allow (if possible at all)
both
kind of tones?
Thanks in advance.

Francesco IS0FKQ