[Antennas] Two meter beam for RDF ?

2002年9月20日 16:36:12 -0700

Back to it .. this is part of the fun of Amateur Radio .. 'spearmintin' ---
buy whatever 2ドル piping that puts a grin on your face .. it will work!
Common sense prevails here .. and, a slight droop of an inch or so is of NO
CONSEQUENCE in this situation... ..
Now, the 3/4" might be superior, in that it allows you more storage space
for the parts while "dismembered" .. use black tape, marking pen, filed
notches, whatever to help you rapidly set up the RDF antenna .. Welding
rod fine, but.. so would be steel coathanger pieces, costing virtually
NOTHING .. Something metal, and fairly stiff .. and, yes, you get the
concept of the end mounting .. As to end length .. whatever you want .. I
would suggest a foot or so, just for comfort. Shorter or longer will have
NO discernible difference in your results! I have a nice 3 el aluminum beam
that I can use for the same thing, and I mount it horizontal for when I work
SSB.
Cheers .. AA6DX
----- Original Message -----
From: "radionut" <[email protected]>
To: "Antennas E-mail Group" <[email protected]>
Sent: Friday, September 20, 2002 4:02 PM
Subject: Re: [Antennas] Two meter beam for RDF ?
> --> My reply to what Mark wrote 9/20/02 5:55:29 PM
>> Well I have neither 1/2 or 3/4 pvc plastic pipe but was going to get what
I
> needed. I was just going to use welding rod as the elements but the
designs
> I have seen on the net use 3/4 pvc and I was thinking and wondering if 1/2
> would be enough to hold the boom straight?
>> A very good point about holding at the back of the boom, it would be
better
> than a center pvc pipe for handling. How much extra pvc did you leave at
the
> back end and does it affect the performance of the antenna any?
>> You could rig up a end mount if you wanted to use the antenna as a
portable
> someplace on a short mast.
>> ----------------------- Original Message ------------------------------
>> Mike .. if you want to use the simple beam for RDF .. just put it in some
> PVC you have on hand ... however you do it will be just fine. I use
RUBBER
> BANDS as bungee cords to hold the elements in place for temporary RDF ..
no
> epoxy .. then, you can undo the elements ( and a short piece of coax,
> perhaps) so as to store within the "mast" ... Use the walk-around beam by
> holding at the back of the boom ... (not the middle) ... and hold right in
> front of your tummy
>> > I want to build up a simple 3 element, direct feed two meter beam for
RDF
> > and portable use. I have found a couple of plans on the net but I want
to
> > use PVC pipe as the boom. I have three questions.
> >
> > Can I get by using 1/2" inch pvc plastic pipe or do I need 3/4"?
> >
> > I want to make the boom in two sections, for easy transport and storage.
I
> > was thinking of just using a 'T' connector and holding the boom in place
> on
> > each side of the 'T' and at a short mast to hold the beam with screws
but
> > wondering if anyone had a better method for quicker assembly and tear
down
> > of this kind of beam.
> >
> > I was planning on using epoxy to hold the elements in place through the
> boom.
> > Just drilling a hole in the pvc boom that is tight fit for the elements
> then
> > applying epoxy to the outside. Anyone have a better method?
> >
> > Thanks
>