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Message-ID: <3.0.1.16.19990824173123.2d0f36f4@mail.cc.kuleuven.ac.be>
Date: Tue, 24 Aug 1999 17:31:23
To: rsgb_lf_group@blacksheep.org
From: "Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be>
Subject: Re: LF: Multiple tuned vertical
In-reply-to: <37C2AE82.20DCA90F@bellatlantic.net>
References: <000601beeba0$859e6e80$ed29f482@win95.swipnet.se><3.0.1.16.19990824093942.2dcf930a@mail.cc.kuleuven.ac.be>
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At 10:38 24/08/99 -0400, you wrote:
>> If it is not asked too much I would be interested in a copy of the Multiple
>> Tuning Antenna too.
>
>in the mail today   :-)
thanks

>> Regarding the meander-antenna : if you scale all the described antennas to
>> 136kHz you still get 'monster-antennas'. But the fact that they manage to
>> increase the radiation resistance by a factor up to 20 (compared to an
>> simple vertical of the same height) is impressive. I would be more than
>> happy to get my radiation resistance up to some 100 milliohm instead of the
>> actual 45 millohm.
>
>20 x would be almost 0.1 ohm, would it not?
>
20 times 45 millohm would be even close to 1 Ohm 

>It seems to me that, somewhat like drafts looking for the fountain of
>eternal youth, all of us are always searching for the perfect small LF
>antenna  :-)
>(the price Faust paid was a little to steep for me...)
Regarding electrical antennas the magic key is 'increase the radiation
resistance'. If you cannot increase the height than you have to look for
alternatives as 'multiple-tuned' or 'meander' antennas.
But I'm afraid you won't get it for free, there will be some drawbacks. For
the 'multiple-tuned' antenna it is (at least) the many big inductors you
will need.
I intend to construct an new (low-loss) loading coil for my antenna. When
that is ready I will do some tests with a 'double-tuned' antenna with the 2
downleads about 22 meter separated, I wonder what I will gain.
Later I will give the meander-antenna a try and sure I will find out what
the drawbacks are on that one .... ..

>See you in October at Winsor?
I'am afraid not, I will be visiting KH6 and W6/W0 in october.

73, Rik  ON7YD

PS : still haven't you postal address. I will be happy to send you some USD
so I do not have to feel guilty if I ask you for copies.