home *** CD-ROM | disk | FTP | other *** search
-
- Audio output from FT790R receiver's discriminator for 9600 bauds
- ----------------------------------------------------------------
-
- 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 ," hole in the case between the standby and speaker sockets. Insert
- a phono socket here and connect the flying lead and a suitable ground.
- Thats it, job done.
-
- Tx audio input into FT790R varactor diode for 9600 bauds
- --------------------------------------------------------
-
- Here is how to input 9600 bauds into the 790's varactor circuitry.
-
- First construct the following circuit.
-
- 470n
- Txaudio----->---] ]------------------22k----->To FC53M
- : : :
- : 22k ---
- : : --- 10p
- : : :
- Txaudio----->----------------------------------->Chassis gnd.
- 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.
-
- Dave G4WFQ @GB7PET
-
-