I saw a suggestion somewhere for using a small "grain-of-wheat" bulb across
the 2nd antenna's lead as you gradually increase transmit power. If I
remember correctly, the bulb I used was a 5 V @ 50 mA lamp, typical of those
used as LCD screen illuminators.
I tried that with a 600 ' Beverage that is at least 75 feet from any
transmit antenna and was very surprised to see the bulb glowing brightly on
a couple bands with only 50 watts into the LPDA up at 55'. The Beverage is
fed with a 9:1 transformer and is about 8 feet off the ground, running away
from any active antennas.
Try it, it's quite an eye opener.
73, Charlie k3ICH
----- Original Message -----
From: "Arie Kleingeld PA3A" <p...@xs4all.nl>
To: <elecraft@mailman.qth.net>
Sent: Friday, January 03, 2014 11:12 AM
Subject: Re: [Elecraft] KRX3 input protection
Steve,
the subRX of the K3 has its protection (an rf triggered relay if the power
coming into the rx is too high).
I've used the K3-KPA500 on a beam and I had a diversity vertical connected
to the subrx quite next to it. No problem at all.
It all depends on the coupling of the antennas. Try and see how you go at
your QTH; the subRX is protected.
73
Arie PA3A
AD0ES schreef op 3-1-2014 15:23:
Hi all,
My KRX3 is on the truck and due tuesday. Quick question: I will be
running the main receiver on a receive only antenna
fed via the KXV3A and the subrx via its bnc aux. These antennas are
quite close to the xmit antennas. Should I use
any sort of attenuation and/or external TR switch on either of these
receiver inputs? I eventually will be running a KPA500
full power...
tia,
Steve AD0ES
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