Anyone ever cast a plastic dipole center peice?
 

If so, whadya use?

Thanks.

Rich.

"Richard" wrote in message
...
If so, whadya use?

Thanks.

Rich.



no, but i have cut them out of lexan.

Richard wrote:
If so, whadya use?

Thanks.

Rich.

I was thinking of the dipole center poeices for VHF beams. Centers that hold
tube.

That's why the gamma match is liked. No split dipole. How were you
planning to get the impedance right with a split dipole?
--
Steve N, K,9;d, c. i My email has no u's.

"Richard" wrote in message
...
Richard wrote:
If so, whadya use?

Thanks.

Rich.

I was thinking of the dipole center poeices for VHF beams. Centers that
hold
tube.

Richard wrote:
I was thinking of the dipole center poeices for VHF beams. Centers that hold
tube.

I use fiberglas tubing for such.
--
73, Cecil, W5DXP

That's why the gamma match is liked. No split dipole. How were you
planning to get the impedance right with a split dipole?
--
Steve N, K,9;d, c. i My email has no u's.


Gamma match is the worst of all the matches. Use fiberglass rod or tube, or
piece of lexan or plexiglass. Better yet use folded dipole for driven element,
increases impedance, efficiency and elegant for connections.

Yuri, K3BU

"Cecil Moore" wrote in message
...
Richard wrote:
I was thinking of the dipole center poeices for VHF beams. Centers that
hold
tube.

I use fiberglas tubing for such.

You mean you get some fibreglass tubing and insert the element rods into it
from each end? I guess so.

Thing is I'm wanting to make a folded dipole element. Perfectly okay of
course if the ends are clamped rather than bent.

Anyway, I was investigating the casting approach, but it does not seem
common. Lot's of non casting ways. :c)

PVC and ABS fittings are popular; your next best choice is probably epoxy.
It can be cast in forms made of almost any material you want.

Mike KI6PR
El Rancho R.F., Ca

"Richard" wrote
If so, whadya use?

Thanks.

Rich.

Richard wrote:
Thing is I'm wanting to make a folded dipole element.

Those are easier. Use a strong solid tube for the upper element.
support the lower element from that one with insulators.
--
73, Cecil, W5DXP

"Richard" wrote in message ...
If so, whadya use?

Thanks.

Rich.

Can make them out of nearly anything non conductive. I've made many of
them from strips of thick printed circuit board material. Peel off the
copper on each side, drill a hole on the middle for a so-239. Drill a
smaller hole in each end to attach the wires. Bingo. Cheapy insulator.
Many people convert long egg insulators to make those. MK

The local craft store has something called "Sculpey", that is a polymer
modeling clay.

Its a modeling clay that hardens when heated in a conventional oven to
about 275 farenheit.

I've used it with a lot of success to make strain relief's for
SMA-to-BNC adapters for my VX-5r handie.

I just never liked the teeny SMA adapters.

I don't know what sort of voltages this stuff might handle, nor how it
would weather--but it's easy to work.

example:
http://www.polymerclayexpress.com/sculpey.html

73
kaz

Schedule 40 or 80 PVC has worked well for me on 10 and 15 meters.
Above 30 MHz it may become resistive. I would bet it is safe to 6
meters.

Win W0LZ