[Elecraft] EXTREME signals

[Dave]

Fred (and Gang)

What sort of antenna spacing are we talking about? I sometimes operate with
two rigs and two operators in a "field" setup, I would hate to damage the K2
(or even my humble K1) by too much RF into their front ends...

Dave, G4AON
http://www.astromag.co.uk/k2/

----- Original Message -----
From: "Indy" <kt5x@cnsp.com>
To: <elecraft@mailman.qth.net>
Sent: Tuesday, March 18, 2003 4:06 PM
Subject: [Elecraft] EXTREME signals


It is so difficult to use language in such a way as to be absolutely clear
to everyone.  let me try agn.

Wayne's back-to-back diode mod across the IF has absolutely no negative
impact upon the radio.  The diodes do not conduct until an extremely strong
signal is present.  When such is present, the diodes bleed off the excess
signal to ground.

the result:  Under normal receiving, one will not know the mod has been
done.  In the extraordinary case that a nearby station, for example, QRP to
the field, four guys have their QRP radios set up near each other, if you
tune across one, that signal will sound no different than any other S-9
signal.  However, when you tune off of that nearby signal, the AGC will be
pumping with the keying of that extremely strong nearby signal.

In my test, I was keying a 100 watt station a few INCHES away from the K2.
I could tune across that signal with impunity, but if I was ten khz away,
the K2 would pump with the keying of that 100 watt adjacent station making
copy of a weak signal impossible, though I could copy a strong signal that
would impact the AGC anyway.

However, if the MP were at five watts, a few khz away there was no longer
any pumping ;-)

If you take your radio to field day and accidently tune across one of the
other stations there, you would be glad to have the mod installed ;-)

73,

Fred