Tony Meloche wrote:

CW wrote:

I won't go into detail but the broomstick (or any helicaly wound antenna)
gives up performance for size. The straiter the wire, the better off you
are. If you have the space, just stretch it out strait.

snip If you can tuck a one-meter broomstick into
your car somewhere for traveling, you've got the world
by the butt for shortwave listening away from home. But at home - your
"permanent space" - go with a random or longwire, if you possibly can.

Tony


For portable use, I've found the AT-271/A antenna designed for the PRC-25 or PRC-77 works quite well. It's about 10' long, and it's set up like the supports used for dome tents - to take it down - you pull the sections apart (they have a chain/shock cord
running through them) and fold them for storage.

I got it he http://www.american-milspec.com/c765.html

Unfortunately, it's just a hair too long to fit inside the aluminum attaché case I transport my 7030 in.

Personally, I think I'd use a slinky over a broom stick. More compact for travel, and if you have more room, you can spread it out.




"Dave" wrote in message
...
I just got through picking up a ton of discontinued wire from my local
Home
Depot, and was planning on building a "broomstick" antenna like some I
found
described on the net. Got a question though: doesn't "stretching out" the
coil to a meter or more reduce the inductance of the resulting coil? Why
wouldn't it work better to just leave it on the spool? I was under the
impression that the formula for calculating the inductance for a given
coil
involved multiplying the square of the number of coils by the ratio of the
coil width to length. Wouldn't this mean that a "longer" coil would have
a
lower inductance than a "shorter" coil, given the same length of wire and
approximate diameter of coils?

Forgive me if I'm being stupid here, it has been twenty years since I have
attempted anything like this, but that was what I thought.

The main account I am thinking of was related by someone in Saudi Arabia
who
wrapped 1.2 kM of wire around a piece of PVC and vastly improved their
reception of WWV in the states. I was going to do something similar, and
then looked at the two spools of wire that I was about to unwrap. They
are
already coils, so shouldn't I be able to just hook them up to an aligator
clip and stick this to my whip antenna? (I am now thinking about taking
the
wire off of the smaller spool and adding it to the larger. Shouldn't that
work?) And if I leave the wire on the spools (which are plastic) couldn't
I
turn them toward or away from the station of interest to further improve
reception? (I could even put this in my attic, gaining a few feet of
elevation and hiding it from my unappreciative wife.)

Any input on any part of this idea is more than welcome. I would greaty
value the opinions of those who have actually done something like one of
these two options.

Thanks,

Dave




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