[ARC5] 274 / ATA: Getting the Most Power Out

[Geoff]

Neat, they didnt have powdered iron toroids to make compact matching units 
back in the caveman era.



----- Original Message ----- 
From: "David Stinson" <arc5 at ix.netcom.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Monday, October 22, 2012 9:51 AM
Subject: [ARC5] 274 / ATA: Getting the Most Power Out


> As ya'll know, my understanding and opinions
> on running Command Sets continues to evolve.
> Running a Command Set transmitter into a 50-ohm
> load doesn't work well unless one does some "conditioning."
>
> The best way I've tried so far is a combination of
> "Boatanchor Bob's" series capacitor and
> Mike Hanz's UNUN.
>
> For 75 / 80 meters,  a 200 pFd 2500 VDC cap
> in the lead to the antenna switch works.
> For 40 meters, use 50 pFd.  For 160 meters,
> .001 (believe it or not) worked best.
>
> There is room in the antenna switch to non-destructively
> mount a 4:1 UNUN.
> Here is the inside of a switch before:
> http://home.netcom.com/~arc5/UNUN/unun1.jpg
>
> Here is how to make a 4:1 UNUN:
> http://home.netcom.com/~arc5/UNUN/unun2.jpg
>
> Here's how to hook it up inside the switch:
> http://home.netcom.com/~arc5/UNUN/unun3.jpg
>
> With this, my 80-meter ATA with the ANT COUPLING
> link set less than 5 delivers nearly 40 watts out on CW.
> And you get to see the RF meter swing.
>
> 73 DE Dave AB5S
>
>
>
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