LF: Re: LF Vertical Antennas problem...

["James Moritz" <james.moritz@btopenworld.com>]

Dear Warren, LF Group,

Assuming you are using the same loading coil as before, another possibility
is that the loss resistance of the antenna has increased a lot - with a
tapped loading coil there is a definite upper limit to the resistance which
can be matched, which depends on the coil geometry. But it would probably
still need something drastic to happen to the antenna to produce a large
increase in Rloss, e.g. bad connection, etc.

Cheers, Jim Moritz
73 de M0BMU

----- Original Message -----
From: <k2ors@comcast.net>
To: "rsgb lf reflector" <rsgb_lf_group@blacksheep.org>; "rsgb lf reflector"
<rsgb_lf_group@blacksheep.org>
Sent: Wednesday, June 20, 2007 11:28 PM
Subject: LF: LF Vertical Antennas problem...


> Hello the list,

>    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
>
>