[WriteLog] ICOM 746 FSK Interface

[Ian White, G3SEK]

Al wrote:
>Is there any secret to using direct FSK keying on the ICOM 746?
>
>I built up a couple simple 2N2222 / 1 K resistor interfaces.  This 
>seems to work fine when keying my FT1000D.  However, when trying to key 
>pin 1 of Accessory Jack #1 on the back of the 746, it just acts like 
>key down all the time (i.e a solid tone).  I fooled around with 
>different resistors but just couldn't get it to work.  If I manually 
>ground the pin, I can hear the two tones.
>
Which tone do you hear? Is the interface permanently keying, or 
permanently not?

It sounds like something very simple that you hadn't spotted, like a 
broken, shorted or wrongly connected wire in the new adaptor lead to the 
746 (that DIN pin numbering can be tricky).

-- 
73 from Ian G3SEK