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Message-ID: <001801c7b392$de27dce0$0300a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <062020072228.467.4679A9F000059E24000001D322058891160B97010D0A020E06979D0E03@comcast.net>
Date: Thu, 21 Jun 2007 00:29:33 +0100
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Subject: LF: Re: LF Vertical Antennas problem...
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Status: O

Hi Warren that sounds familiar !! I think you are using covered wire, my
guess is a break on one leg so that you do not have enough capacitance to
resonate with the original coils. A top-band dipole will still work quite
well with one leg disconnected. Can you leave out the loading coil and
measure the resonance frequency of the wire T alone that might give some
clues. I have had this effect when part of the top load comes disconnected.

Good Luck with it
Cheers de Alan G3NYK

----- Original Message -----
From: <k2ors@comcast.net>
To: rsgb lf reflector <rsgb_lf_group@blacksheep.org>; rsgb lf reflector
<rsgb_lf_group@blacksheep.org>
Sent: 20 June 2007 23:28
Subject: LF: LF Vertical Antennas problem...


> Hello the list,
>
>     I have in the past used my 160 meter dipole as a vertical "T" by tying
the feeders together and using a tapped loading coil to resonate and match
the antenna. I could get a perfect 50 ohm match in this manner and it
radiated quite well - Hartmut copied my transmission running around 100
watts. I have also used the same setup on 500kHz with a different loading
coil successfully.
>
>    Now I find that I cannot resonate the antenna - I can't eliminate the
reactance no matter what the setting of the tap or the coil. The best I can
do is an swr of 1.7:1 and at least 40 ohms of reactance. I have tried
changing coils and still the problem persists.  If I do transmit this way,
my signal seems to be down at least 10dB below what it was when the antenna
resonated properly. Any thoughts?
>
>
> --
> 73 Warren K2ORS/WD2XGJ/WD2XSH/23/WE2XEB/2
> FN42hi
> http://www.w4dex.com/wd2xgj.htm
>