K2 using the PA xmit RCA jack output for AUX VDH out

[dw-4]

Hey Gang,
I don't believe I will ever use an external amplifier for > 100 watts
Pwr.
In 30 years of cw-ing, I've always operated 100 watts or less.

The K2 KPA100 amplifier incorporates an RCA jack on the rear for
triggering an external amp.

I'm thinking about modifying this in order to use it as an AUX VDC
output.
I could run an external keyer or swr power meter with it.

Has anyone done this?
Or do you have suggestions on how this would be best done?

Thanks
Duane
N1BBR
--
 [hidden email]

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[Mark Bayern-3]

Questions to think about:

Will you pickup the 12V before or after the rig's current monitoring
resistor R115)?
Before or after the power switch?
Will the power used cause F1 to trip?

Mark



On Wed, Jul 8, 2009 at 9:05 AM, dw<[hidden email]> wrote:

> Hey Gang,
> I don't believe I will ever use an external amplifier for > 100 watts
> Pwr.
> In 30 years of cw-ing, I've always operated 100 watts or less.
>
> The K2 KPA100 amplifier incorporates an RCA jack on the rear for
> triggering an external amp.
>
> I'm thinking about modifying this in order to use it as an AUX VDC
> output.
> I could run an external keyer or swr power meter with it.
>
> Has anyone done this?
> Or do you have suggestions on how this would be best done?
>
> Thanks
> Duane
> N1BBR

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[Steve Ellington]

Just be sure to switch it back before you become a SK otherwise some
unsuspecting ham will end up with it and hook it to his amp key input. Maybe
add this to your will.

Steve
N4LQ
[hidden email]
----- Original Message -----
From: "dw" <[hidden email]>
To: "Elecraft_List" <[hidden email]>
Sent: Wednesday, July 08, 2009 10:05 AM
Subject: [Elecraft] K2 using the PA xmit RCA jack output for AUX VDH out

> Hey Gang,
> I don't believe I will ever use an external amplifier for > 100 watts
> Pwr.
> In 30 years of cw-ing, I've always operated 100 watts or less.
>
> The K2 KPA100 amplifier incorporates an RCA jack on the rear for
> triggering an external amp.
>
> I'm thinking about modifying this in order to use it as an AUX VDC
> output.
> I could run an external keyer or swr power meter with it.
>
> Has anyone done this?
> Or do you have suggestions on how this would be best done?
>
> Thanks
> Duane
> N1BBR
> --
> [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html 

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[Don Wilhelm-4]

Duane,

Although you can certainly do that, I would suggest that you do not.  If
your K2/100 were ever sold, the buyer would expect that jack to be wired
in the normal manner.

If you want 12 VDC for accessories, I would suggest that a RigRunner
would be a better solution, or wire an in-line jack on the power cord.  
CAUTION, the extra jack would have the full current potential of your
power supply, and should be fused with a fuse size that is consistent
with your accessory and the size of its wire.  Running high current DC
into a small gauge wire can cause molten metal to fly in the event of a
fault - think safety!

73,
Don W3FPR

dw wrote:

> Hey Gang,
> I don't believe I will ever use an external amplifier for > 100 watts
> Pwr.
> In 30 years of cw-ing, I've always operated 100 watts or less.
>
> The K2 KPA100 amplifier incorporates an RCA jack on the rear for
> triggering an external amp.
>
> I'm thinking about modifying this in order to use it as an AUX VDC
> output.
> I could run an external keyer or swr power meter with it.
>
> Has anyone done this?
> Or do you have suggestions on how this would be best done?
>
> Thanks
> Duane
> N1BBR
>  
> ------------------------------------------------------------------------
>
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>  

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