[TRLog] PTT output and 1000MP

Tree N6TR tree@kkn.net
Wed, 8 Aug 2001 10:41:28 -0700

> I am using the standard TR  LPT port keying and PTT interfaces with a
> 1000MP Mark V (1K resistor to base of open-collector 2N2222, emitter to
> strobe line, open collector to plus of keying or PTT jacks).  Previously
> these interfaces worked fine with my TS-930.  Either one will key the Mark
> V's CW, but neither one will key the PTT line at the jack on the back (in
> other words, the interfaces appear to be functioning as designed).
> Anyone else had this problem?  How did you cure it?

Try putting the emitter to ground.  The strobe pin will limit how
much current can be sunk - and also result in a slightly higher
"low" voltage.  This could be the difference.


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