>I want to use an IC706MKII as 2nd radio (using a TS940S as 1st radio). Do I
>really need that CT-17 interface? Is there a cheaper work around? Can I key
>the IC706 with the same keying transistor Isetup use for the TS940S?
Please
>help somebody. Thanks in advance.
First, I use the same keying circuit as used with my TS450, worked fine in
the recent CW WPX
You need the CT-17 (or one you can build for considerably less money) to
convert the RS-232 signal levels to the TTL levels used by ICOM CI-V
interfaces. A circuit for doing this is in a QST article, Feb. 1992. The
circuit diagram is available on the WWW at
http://www.ambersoft.com/Amateur_Radio/Icom_Interface.jpg
A printed circuit board is available from Far Circuits at
http://www.cl.ais.net/farcir/modem1.htm
for $3.50US.
There is also as circuit diagram which has been used with an IC706 at
http://www.hamradio.cz/rigs/novaradia/icom/ic-q7/iface.gif
73,
Larry N6TW
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