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HERE CAN YOU FIND THE PACKET RADIO SCHEMATIC PAGES
THE SCHEMATICS PAGES - SCHEMATIC OF A AFSK RTTY TRANSCEIVER
RTTY/CW TX TERMINAL FOR: IC756 ( all series ), IC7400, IC746, IC7000 ( PC Not Required )
I0CG Giuliano Carmignani
Copyright - GENNAIO 2008 Document Revised 10 December 2009
giulianori@virgilio.it
www.i0cg.com
IC-756, IC-7400, IC746 IC-7000 and Elecraft K3 have a built in RTTY decoder but RTTY transmission is very hard because Keyboard isn't supplied.
A USB or PS2 keyboard can be used, preferably a USA Keyboard.
This interface can be used to add a standard PC Keyboard to some ICOM TRX.
Also CW transmission can be performed so, for this use can be used as CW keyboard with all commercial or home-made TRX.
Ideal for portable operation because PC isn't required F1 - F10 can be user programmable Key with standardized message.
Only one example:
F1 is memorized with : cq cq de i0cg, F2 with: pse K (note that “ is the cursor right Key that perform RX return)
To do a RTTY call: when I press: F1, F1, F1, F2 consecutively The TRX transmit the following text: cq cq cq de i0cg cq cq cq de i0cg cq cq cq de i0cg pse k
memory messages transmission can be stopped before message end in this mode when RTTY Mode is selected:
switch CW/RTTY key one second in CW then switch again in RTTY when CW mode is selected switch CW/RTTY key one second in RTTY then switch again in CW
The “ and ” key can be used inside memory message o directly for the Keyboard to switch TRX in RX mode.
Transmission is performed automatically when any Key has pressed. The F11 is a dedicated memory that allow an automatic counter for contest.
Any time I press F11 TRX transmit three numbers automatically incremented ( Ie: 001, 002, 003 ).
I can overwrite this # to modify the first numbers transmitted.
This counter can be used in RTTY or CW too.
F12 transmit I0CG logo and SW version used. Can be voluntarily transmitted.
The others functions F3 - F10 key can be programmed as desiderata with Name QTH and so on.
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