[Elecraft] Antenna considerations (what to do?)

Fri Dec 12 20:30:01 2003

Dick,

you could use an LDG RT-11 remote water proof tuner mounted at the =
antenna base. This is $179 US in a kit and $211 assembled. Here is the =
simulated input impedance over perfect GND:
160M   3.3 -j530 ohms
80M     15 -j164
40M    142 +j254

A ground consisting of eight 15 meter radials will give an equivalent =
loss resistance of about 20 ohms. The approximate radiation efficiency =
and input impedance over actual ground with 8 radials will be (assuming =
no tuner losses):
160M   14%   32 -j530 ohms =20
80M    43    35 -j164
40M    88   162 +j254=20

I believe the LDG will tune this nicely.=20

Not the best on 160M but all right on 80M and quite good on 40M. I use a =
similar homebrewed antenna (self supporting vertical) that is 12 meters =
tall. It is for 160M and has an efficiency of 25% but is not multiband. =
Your Titanex will even work well on 30 meters. On 20 and above high =
angle lobes develop. So, you would have an effective 160-30 meter =
antenna with quick remote tuning.

   Dave WX7G

=20
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Dick Hissink
Sent: Friday, December 12, 2003 2:19 PM
To: [email protected]
Subject: [Elecraft] Antenna considerations (what to do?)

=20
Hello Elecraft community,
Well my K2 works flawlessly and it is time now to bother about the
antenna's before the frost gets into the ground.
I like to set up a vertical next to my G5RV antenna, and found very nice
verticals made by Titanex in Germay ( see their site www.titanex.de
<http://www.titanex.de/> ) The antenna I set my eye on is the 8030
vertical. And now, here comes the big question. Titanex advises to use a
tuningbox close to the antenna to make it operate at different bands.
This is a very expensive box, and made for more than 1KW of power..not
exactly QRP.  My question is, can I feed the 8030 directly with coax and
use the KAT2 to tune the antenna? If not, why not, and what options do I
have? I really want to put up a vertical to experiment with, burry
enough radials etc. Ok gentlemen antenna guru's who makes me
Happy and gives me an affordable solution to coupling my K2 to the 8030.
Thanks Dick PA3CW K2#3724
=20
=20

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