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Re: Elecraft KX3 Owner's Manual now available(*preliminary*)

Posted by Don Wilhelm-4 on Mar 05, 2012; 8:41pm
URL: http://elecraft.85.s1.nabble.com/Elecraft-KX3-Owner-s-Manual-now-available-preliminary-tp7343177p7346318.html

Lance,

I would not think you could apply raw RS-232 levels (up to +/- 25 volts)
to any input of the KX3 other than those designed to accept those levels
- and that certainly would apply to the GPIO.  I would expect it to
accept a maximum of 5 volts and a low level of zero volts - so you need
the one-transistor circuit no matter which way you plug it.

73,
Don W3FPR

On 3/5/2012 2:50 PM, W7GJ, Lance wrote:
> Hello Olli,
>
> The advantage is that I could possibly pull out the RTS line from my one RS232 cable
> to the computer, and simply add it to the amplifier PTT plug in ACC2.  I would not
> have to build a transistor switch to directly trigger the PTT line, which would have
> to be broken out from the custom MIC plug.
>
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