TS790.5

		TS-790 & 9600 Baud Operation   (Rev 2)
		----------------------------

These notes were partly taken from James Miller, G3RUH notification for FT736R
and the article of my good friend Sueo Asato, JA6FTL.

These mods are working very well with 9600 bps UO-14 and CBBS operation
currently used at my site.

Please refer to G3RUH's notification for FT736R for more detail.
RX/TX mod suitablity remains same as his notes.

TS-790 ; FM Direct from Discriminator
-------------------------------------
Detected and amplified/buffered FM direct from the receiver discriminator is
available from Pin-9 IC1 (Sub) or IC8 (Main).
I use IC1 (Sub) for reception.

TS-790 ; Direct varactor FM Modulation
--------------------------------------
Inject your TX audio at the cathode side of diode D81 with a 1K ohm register
in series. You can find D81 near Q73 in your IF UNIT diagram.

Misc ;
------
It takes a bit hard work for very small and jungle PCB. Use tiny tools.
Carefully adjust the TX audio level by VR1 of the modem, it's rather low.
You would probablly need some local friend to do this adjustment, asking him
to tell you his TNC's DCD LED stays steady (no flicker).

  de Kohjin Yamada, JR1EDE @ JR1EDE.11.JPN.AS