Audio output from FT790R receiver's Discriminator for 9600bauds
Here is a very simple way of taking audio direct from the discriminator.
Connect a flying lead to pin 9 QO8 (MC3357P). (To save you having to burrow,
just solder a lead on the IC pin itself). Drill a 1/4 hole in the case between
standby and speaker sockets. Insert phono socket here and connect the flying
lead and suitable Gnd. Thats it, job done.
TxAudio input into FT790R Varactor diode for 9600 bauds
Here are the details to input 9600 buads into the 790. Firstly make up the
following circuit.
470n
Txaudio----->---] ]------------------22k----->To FC53M
: : :
: 22k ---
: : --- 10p
: : :
TxAgnd--->----------------------------------->Chassis Gnd
Notes:-
When you make up the above circuit, you must use very short leads!!!!
FC53M is a Varactor diode which is D1031 on the FT790r diagram.
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