[Elecraft] KIO2 question amp-keying

[Christoph Rheker]

Hallo Harry,

I don't know abt the KIO2.. but to key my Command tube Amplifier I am
using a circuit as simple as it can get:

A PNP BCY79 switching type transistor and a 10k resistor, that' it!
It's connected to J13 as described in "K2 Amplifier Keying Circuit"
on the web pages.

73 aus Erding, Christoph DL4YAO

kc4kgu@ENTERZONE.NET schrieb am 07.10.02 01:03:50:
> I'm pretty sure that the AMP is going to simply look for "dry
> contact" type of switching IE; if you short the two wires from the amp on
> the keying line, it will key.  You have two choices here.  Use the 8v out
> of P9 to drive a relay and use the dry contacts on that relay to key the
> amp or, build and install the amp-keying circuit which uses solid state to
> do the same thing.
> 
> 73 de John - KC4KGU
> K2/100 #2490
>  
> 
> 
> On Sun, 6 Oct 2002 DK2GZ@aol.com wrote:
> 
> > Hello
> > 
> > I just installed the KIO2.
> > 
> > The reason was, that would drive the external linear with
> > the KIO2, because I saw the is Pin 1(ground) and Pin 9
> > to switch relais of an external amp.
> > 
> > I was wondering that I still hear the sidetone using U-6-25,
> > instead of U8-4, when I switch over to U8-4 the sidetone
> > was off.
> > 
> > Next I tried to switch the relais in the amp, nothing.
> > 
> > Is there only 8 volt out on pin P9 of the RS232 and this is
> > maybe to low for the relais in the TenTec Centurion?
> > 
> > Did anyone switch the relais in the external amp with
> > the KIO2?
> > 
> > 
> > 73 de Harry, DK2GZ