[Antennas] Questions!

Sun, 4 May 2003 19:07:26 -0400

Dear Osten,

It's a totally ridiculous idea and isn't worth even trying. As you say, the
voltage is very high (the current is also very low) at the ends of a dipole.
Therefore, there isn't a relay in existence that can help you there. Did it
ever occur to you that if such an idea had any chance at all, someone would
have already tried it and published the results? In fact, the only antennas
that I have ever heard of that use relays, use the relay or relays for
switching in the transmission line - hopefully, at a point where the current
and voltage are consistent with the capability of the relay.

There is no good reason for having a dipole be one half wavelength other
than a fascination for a particular radiation pattern. You still put all of
the energry into space - somewhere - unless there is an efficiency issue, in
which case you deal with the efficiency issue - not the length of the
radiator.

Tuners are not bad - you should get used to that and embrace the idea - it
works for everyone else.

73 de W9DMK (Bob Lay in Dahlgren, VA
http://www.qsl.net/w9dmk
----- Original Message ----- 
From: "Osten B Magnusson" <[email protected]>
To: <[email protected]>
Sent: Sunday, May 04, 2003 5:28 PM
Subject: [Antennas] Questions!

Friends!

I was on this list some years ago and now I'm back again!
A question or two:

I'm living on an urban lot less than 1000 square meters, and
no space for more than one tower. I have been using an
inverted vee for a couple of years on 80 meter CW, more
than 230 DXCC-''entities'' worked, and now I'm going to use
it also on 17, 30, 80 CW - 3500 - 3225, 80 SSB 3575 - 3580
and 160 meters. My idea is to have relays in each leg adding
lengths when going from higher to lower frequencies. In this
case it means 4 relays in each leg, totally 8 relays.

As there is high voltage in the ends of the legs what kind of
light-weight relays can I use, not too expensive and easy to
get?

How will the 12 or 24 Volt DC lines to the relays affect the
antenna?

I think you may say it's simpler to use an antenna tuner but
NO, I don't like them...

Would like to get your answers to the questions and also
of course your opinion to the whole idea, thanks in advance.

By the way, I'm a DX'er but everything worked on 40, 20 and
10 meters, 12 is going to die, so no need for those bands.
I would like to put up a monoband beam for 30 meters but the
problem is to have that at 70 feet as I need a support higher
than that to get the beam rotatable inside the inverted vee,
probably impossible!

Hope to hear from you, all the best and 73 de

Osten SM5DQC   [email protected]

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