Message-ID: <02c401c4f6b0$3e2e1160$0201a8c0@private.network>
From: "Scott Tilley" <sthed475@telus.net>
To: rsgb_lf_group@blacksheep.org
References: <12c.54d56369.2f12680d@aol.com> <007801c4f6ac$9538ec40$6401a8c0@eagles>
Date: Sun, 9 Jan 2005 17:03:48 -0800
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Subject: LF: Re: Antenna plans de  J.
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J.

Canada's position for WRC-2007 is to allow amatuers 1W EIRP.  If you used
that as your 'reference' then you shouldn't go wrong.  I asked for 1W EIRP
to keep my experiment in line with the work that is going on to get the band
approved.

73 Scott

----- Original Message -----
From: "J. Allen" <vy1ja@northwestel.net>
To: <rsgb_lf_group@blacksheep.org>
Sent: Sunday, January 09, 2005 4:37 PM
Subject: LF: Antenna plans de J.


> Alex, Jim, Markus, and LF,
>
> The reason for setting my calculations in front of all, is that I am new
to
> LF and want the station to have early  success, rather than being a set of
> mistakes and recoveries.  You might be surprised, but although I am a 4th
> dan black belt and head of TaeKwon-Do Yukon, I am not a fighter, and have
a
> tendency to give up on things which I have made a solid attempt at and
find
> repeated failures.
>
> The reason for using the complicated antenna structure as I describe it is
> that it is already standing... It is a large HF/MF V-beam with ~120 meter
> legs up ~20 meters, with ~55 degree included angle.   The antenna is fed
> with 75 Ohm hard line which was in with a number of damaged tower sections
> which I earned by cleaning up a commercial broadcasting station
construction
> site.  The towers had been taken down by persons unknown who cut the guy
> lines and let the towers fall!  I use this antenna on 160-2 meters and it
> functions quite well with an antenna tuner.  It is the receive antenna
which
> I am now using on LF and although it is a sort of "short dipole"on LF, it
> works very well.
>
> The area of the antenna for several KM in all directions is poor sandy
soil.
>
> I have on site approximately 20 km of ~#10 copper-clad high-tensile steel
> wire, which was used for overhead telephone wires for many years.  This
can
> be buried for radials or more wires run up high to increase top
capacitance.
> How big does the elevated counterpoise need to be at LF to be effective?
> With the wire I have available, I could make a fairly large one in terms
of
> feet, but it would still be small in terms of wavelength.
>
> It may be easier to put a loading inductor out at the tower end of each
> insulator, and add LF to the antenna use, than to build a new antenna
> system.
>
> As to the typo.. It is not critical now that I know about it and can make
> allowance for it... When the loading coils are in and measurements can be
> take of the LF antenna as a system, I will again send calculations to the
LF
> reflector to make sure that I am not running more power than I should be.
I
> prefer to have someone look at my work.  These are my limitations:
>
> Technical Operation Data:
> -A transmitter will be used between the frequencies of 135.7 and 137.8kHz,
> in the 2200 metre band.
>
> -Emissions outside of this frequency range will be suppressed by a minimum
> of 30db from the fundamental signal.
>
> -Bandwidth of the transmitted signal will be limited to 100Hz or less.
>
> -Radiated power will not exceed 1 watt ERP.
>
> -The transmitter will be operated with care not to interfere with
authorized
> users. Authorization for experimental transmissions will be on a secondary
> user basis. I am aware of Canadian military operations in this frequency
> range and will avoid transmitting on their frequencies. Any requests from
> primary users to cease transmission or to change frequency will be
> immediately complied with.
>
>
> I did not think to set 1W ERP relative to anything... I do not know what
> Industry Canada normally measures it to, and will need advice from
> experienced Canadian LF ops like Steve or Scott on the normal comparison
for
> ERP.
>
> Alex,  Thank you for your continuing help.  I am retired and live on a
> fixed, small income.  Litz (sp?) wire in not being considered.  I have
> friends at the local power company who are watching for a "pole pig" or
> other transformer with a burned primary winding and good secondary, which
I
> can acquire at the value of the scrap copper within it.  I plan to
> disassemble it for the flat secondary copper strap winding, which is
usually
> well insulated with a material that looks like varnish.  I have been given
> three pieces of 13 inch X 36 inch long PVC pipe, which I was going to use
> for loading coil forms (formers), but have been told that they are lossy
and
> I should use something else.  At this point I am still planning to
> disassemble the transformer, but I do not know whether to use the PVC and
> accept the loss from it or to use another type of coil form.
>
> I have about 20 pieces of 5/16 inch X 60 inch fiberglass rods which I can
> use to make a form if needed.
>
> I can move the V wire insulators out from the tower by a couple meters if
it
> will help.
>
> I have found this LF group to be friendly and supportive, and believe that
> my chances of success are very likely to be a reflection of your
direction.
>
> I appreciate the humor of the group as well.
>
> J.
>
>
>
>