[Elecraft] External amplfier keying ..

[Eric Swartz WA6HHQ - Elecraft]

Hi John,

The K2's Rev 2 and above firmware supports keeping external devices keyed for as
long as you have the TR delay in the K2 set to. This is useful for transverters
and non-full break in linear amplifiers. Here's the extract from the V2.1
firmware notes on our manual download page:

To control relay switching, you can use the K2's "8R" (8-volt RX) signal, which
is available at the KIO2 Aux I/O connector. Simple external hardware can be used
to switch transverters to TX mode when 8R goes from 8V to 0V. The firmware also
provides a way to keep 8R at 0V during the T-R delay. (This has no effect on
normal operation of the K2.) To use this "8R hold" feature, locate the T - R
menu entry, set the delay parameter to the desired value, then tap D I S P L A Y
until 8 r h o l d is displayed.

73, Eric
======
John Crux wrote:
> >
> > Has anyone successfully used an external amp which has relatively
> > slow, non-QSK  relays ?
> 
> > I'm due back in ZS6 in June, so if I use the AMP-KIT circuit to bring
> > up the Ameritron, is there any way of stopping the amplifier relay(s)
> > trying to drop out between characters ?? In other words, is there
> > enough delay at the 8R drive point, or do I really need to switch the
> > Ameritron by hand again ?
> 
> > John G3JAG

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