[Elecraft] Mast Mounted Preamp

[Don Wilhelm]

The PR6 is controlled by either the DIGOUT1 line in the ACC connector, 
or with the jumper installed, it is connected with the RX ANT button 
(not the PRE button).
So I don't see how you could use either the PRE button or the RX ANT button.

You could use the DIGOUT1 signal to operate a 5 volt relay (with a low 
current draw coil) which in turn provides 12 volts to the preamp, but 
your preamp would be active any time 2 meters is selected.

There is only 15 ma. available at the DIGOUT line, which means the 
current draw must be low.

73,
Don W3FPR

On 2/16/2013 2:38 PM, Richard Thorpe wrote:
> I have a 2 meter mast mounted preamp that is fed thus turned on by a bias tee injecting 12V into the coax, can I control that preamp by switching that 12V the same way the PR6 is controlled by the pre button on the K3 through the ACC connector? Thank you.
>
> R Thorpe K6CG
>