[Elecraft] KX3 2m: how to get +TX voltage during transmission?

[Cady, Fred]

Here ya go:

When in the 2M/4M menu, tap  2  to toggle between TX 5V- (the default) and TX 5V+.  When TX 5V+ is enabled, 5 VDC (± 0.3 v at 0.1 mA) is applied to the center pin of ANT 2 when transmitting.  This can be used to switch or control external devices such as additional transverters that use 144 or 70 MHz as their IF.  

Cheers and 73,
Fred KE7X

Author of:
"The Elecraft K3: Design, Configuration and Operation 2nd ed"
"The Elecraft KX3 - Going for the summit"
"The Elecraft KPA500 and KAT500 - the K-Line Dream Station"
Printed, coil bound copies of these are all available at www.elecraft.com
KPA500 and KAT500 Quick Set Up Guide
http://www.ke7x.com/home/k-line-introduction-and-set-up-guide
KAT500 and KXPA500 Tuner Operation
http://www.ke7x.com/home/kat500-and-kxpa100-tuners

"The Elecraft KXPA100, PX3 and 2M/4M Transverters - Assembling the KX3-Line Station" available at www.lulu.com.

"The Elecraft K3S and P3"  (A work in progress)

> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
> Matt Zilmer
> Sent: Friday, July 03, 2015 11:47 AM
> To: Jack F6AJW
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] KX3 2m: how to get +TX voltage during
> transmission?
> 
> Maybe... Use a bias T with the DC feeding torwards the transverters?
> The ACC2 keyline (p5, Owner's Manual) is pulled low during transmit and
> could be used to activate a FET or bipolar switch to 12VDC.
> 
> 73,
> matt
> W6NIA
> On Fri, 3 Jul 2015 19:37:52 +0200, you wrote:
> 
> >Hello All Elecrafters,
> >
> >I have a KX3 2m; I don't know how to configurate it in order to
> command
> >DB6NT microwave transverters needing +TX voltage present on SMA
> >connector during transmit? KX3 has already last firmware loaded.
> >
> >Thanks in advance for your explanations. 73's.
> >
> >Jacques F6AJW / Paris
> >
> >
> >---
> >L'absence de virus dans ce courrier électronique a été vérifiée par le
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> Matt Zilmer, W6NIA
> --
> "Always store beer in a dark place."  -R. Heinlein
> 
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