On Thu, 07 Mar 2002 10:49:00 -0800 Jim Smith <jimsmith@shaw.ca> writes:
> When I put something bigger up I will probably steady the top of the
> tower with 4 dacron guys, whether or not I add 5 more ft of Rohn.
Good idea.
> Why 5 ft? I have a 5 ft section lying on the roof deck.
> Why 4 guys? Because
> I can get better placement of the guys with 4 than with 3.
Sounds reasonable.
>
> Anyway, I figure the smaller antenna will put less stress on the
> somewhat unconventionally installed tower.
True.
>
> Someone suggested forget the antenna and get an amp.
An amp will give you more gain than a beam.
400/100W = 6 dB 800/100W = 9 dB
1000/100W = 10 dB 1600 / 100W = 12 dB
> With an antenna I'll hear better.
Maybe, maybe not. I've worked over 320 countries
on each of the WARC bands using dipoles and
up to 800W.
> With an amp I won't. Also, TVI around here is barely
> under control. Not sure I can get away with using an amp.
QSL. That can be a problem.
> Plus, I still wouldn't have the presence on 40 that a 2 el beam
> will give me.
A 'shortie 40' might have 3 dB gain over a dipole.
I worked my first 300 countries on 40M using
rotary dipoles at 80 ft (and an SB220).
>
> One major item is the need for something decent on 40 that I can
> erect.
A rotary dipole is a very effective 40M antenna.
Tom N4KG
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