[1000mp] PTT keying current on FT1000MKV Field

[Tom Homewood]

I found the same thing with my MP using the PTT jack on the back of the rig.

I finally just used a transistor in place of the opto-isolator.

Tom, W1TO


----- Original Message ----- 
From: "Mark" <n2qt at verizon.net>
Sent: Monday, December 27, 2004 2:31 PM
Subject: [1000mp] PTT keying current on FT1000MKV Field


> In building a FSK interface for my FT1000MKV Field. I was having trouble
> with the PTT, the
> FSK part worked fine.  What I found was that the PTT keying circuit of the
> FT1000 needed
> a current sink of about 18ma which my poor little opto-isolator was not up
> to.  This was in
> conflict with the ops manual which indicates a current sink requirement of
> 1.5ma.
>
> (The FSK needed less than .5 ma sink.)
>
> Am I missing something?
>
> Mark N2QT
>