Topband: NCC-2 antenna pattern?

[n4is at comcast.net]

"Since I am on a 50 x 100 foot lot, it is impossible for me to separate my
rx antennas from my tx antenna.  "

Hi Rob, my city lot  backyard is 50x100 and I worked  (CW only)  305
confirmed on 160m from 2006 to 2019, it is not easy but doable to detune
your TX antenna. I use a wire skirt around my tower, making it a UNIPOLE,
the skirt and the grounded tower works like a 1/4 wave stub, with a high
impedance at the base. That way the TX antenna does not interact with the RX
antenna.
Distance is another like what you want, but 1 wave distance is not far
enough ,and It is 525FT for 160m, Detune is not the impedance on the fed
line, it is the impedance from the antenna to the ground. If you TX antenna
is isolated from the ground a relay can isolate the antenna from the ground.
Any cable  longer than 30FT should be take care as well., including rotor
cables.
Doug NX4D lives in 1/5 acre and he worked #315 from 2003 to 2019,. So don't
give up. topband is a fantastic band when you can hear the weak signals.

73's
JC
N4IS


-----Original Message-----
From: Topband <topband-bounces+n4is=comcast.net at contesting.com> On Behalf Of
Rob Atkinson
Sent: Monday, December 18, 2023 6:14 AM
To: topband at contesting.com
Subject: Re: Topband: NCC-2 antenna pattern?

Since I am on a 50 x 100 foot lot, it is impossible for me to separate my rx
antennas from my tx antenna.  Of course on transmit, preamps and the NCC1
are deactivated, but even so, the NCC1 had internal relay chatter (there are
around nine PC board mounted relays inside).  Small RF chokes in series with
the DC power line to the box eliminated the
chatter.   I may have added bypass caps inside it but I can't remember
if I did that or not.  But if so, that wasn't enough.  The chokes did the
trick.

Merry Christmas

Rob
K5UJ

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