[1000mp] ptt keying current ?

[Tom Homewood]

This is pretty close to what I measured, in fact I think I measured a little 
more current.

I could not sink this with an opto coupler. I went to a discrete transistor.

73, Tom, W1TO


----- Original Message ----- 
From: <zoltan.pitman at vodafone.com>
To: <1000mp at mailman.qth.net>
Sent: Monday, May 23, 2005 5:20 AM
Subject: [1000mp] ptt keying current ?


> Hello all,
>
> Can someone pelase tell me how much current flows (should be flowing) when
> PTT is shorted directly? I measure 13.7V when it is open, and 9mA when it 
> is
> shorted.  I have plain vanilla MP.
>
> I suspect something has happened inside because the keying transistors 
> needs
> to be opened much more to key the radio.
>
> thanks,
>
> zoli ha1ag