[Elecraft] Strange K2 Behaviour - KAT100 Antenna Isolation

[Geoffrey Mackenzie-Kennedy]

Hi Mike,

I have the same thing here even with a dummy load on the ANT 2 connection
(default in case anything goes ape). It is something that I would expect,
how much isolation depends on the type of relay used, the frequency, how
well the relay coil is by-passed , the crosstalk between external circuits,
leakage through the box, etc etc etc. I would hope that when you switch to
ANT 2, the signal drops a lot. I have not measured anything to do with this,
but I would GUESS that at 7.1 MHz the isolation is around 50 - 60db. Hope
this helps.

73,

Geoff.
GM4ESD


----- Original Message -----
From: "Mike Walkington" <mike at walkingtons.com>
To: "Elecraft-Reflector" <elecraft at mailman.qth.net>
Sent: Monday, January 24, 2005 11:17 AM
Subject: [Elecraft] Strange K2 Behaviour - KAT100 Antenna Isolation


> Hi All,
>
> Continuing the theme of describing strange K2 behaviour!  My KAT100 is
> remotely installed in an EC2.  I use ANT1 with nothing connected to the
2nd
> antenna socket.  Recently I noticed that having tuned in a relatively
strong
> station on ANT 1 and switching to the 2nd antenna (ie by pressing
ANT1/ANT2
> switch) that I could still hear the station even though there is no
antenna
> connected to ANT2.  This made me wonder what the isolation is between the
> two antenna sockets and if anyone has measured it or whether I have a
> problem that I need to locate and fix.  Sorry, but I haven't yet swapped
the
> antenna to see if the behaviour reciprocates.
>
> Mike
> VK1KCK
> K2 #2599
>
>