RF measured two different batches of the Plastic covered WD-1A
wire. One was 130 ohms and the other was 150 ohms.
Lot of hams use it for two wire beverages with good luck.
1. Remember postings saying Beverage wire size could be very small
if it could be physically supported. This
because the current on the wire is so small the loss is small. This
wire does have some copper strands, think it was four..
2. Then because the impedance is so low that almost any insulation is
adequate.
I put up a temporary beverage 4 or 5 years ago -(time flies) My
wire just running over the branches along a tree line- no insulators..
It was, yes I 'll say it again, 'temporary' for a few months but years
later it is still working well.
The wire is tough, made for war time use... It stands up well..
I do stay away from the old original type with a lot of twist, as
believe there is 'some' cancellation. (like as in twisted pair)
73
Bruce-k1fz
http://www.qsl.net/k1fz/beverage_antenna.html
On Mon, 10 Oct 2016 17:00:23 -0400, Herbert Schoenbohm wrote:
But believe the WD1A really works well at this QTH in both forward and
reverse modes. I have made many direct comparisons on extreme DX on 160
and the WD1A was the difference it too to hear the weak signal. My
tests on the VK0 and VP8 Dx-peditions with a 600 foot single wire
Beverage and the WD1A reversible configuration of the same length made
me a firm believe in the WD1A Beverage ability. Furthermore the WD1A is
cheap, strong, easy to construct just passing over limbs of small
trees. In fact it is so strong that when a deer (yes we have them here)
gets caught up in them the far end boxes, until I put in break away
jumpers, was the victim.
On 10/10/2016 4:41 PM, Richard (Rick) Karlquist wrote:
Boxbe This message is eligible for Automatic Cleanup!
(richard@karlquist.com) Add cleanup rule | More info
Hi Herb and all,
When I was in the Army, 1958 to 1960,, I was a "Field Communications
Crewman". It meant, I helped string telephone wire.
We used what was called WD-1TT. It was two separate conductors. They
were twisted, not molded together. Each conductor was made of 3
steel wires and 4 copper wires making a 7 strand conductor. It might
have been 4 steel and 3 copper.
I have never found listings for WD-1TT on eBay. We spliced it by
stripping about 10 inches from each conductor and tying a square
knot and twisting the loose end on the conductor and covering with
friction tape and then Scotch electrical tape. We could run 3
telephone circuits on 2 wires and ground with isolation transformers.
Regards...Price W0RI
With steel being very lossy AND magnetic AND frequency
dependent, the characteristic impedance of this
stuff is likely to be complex and frequency varying.
I don't see how it would ever work well for a
reversible beverage.
Rick N6RK
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|