And if one needs a heavy duty solution for installations with a folling branches and trees then 2 of WD1A at your favorable spacing is a good choise
2 x WD1A 500 mm apart is very close to 800 ohms and easy to match 2015-06-07 23:09 GMT+03:00 jeremy maris <[email protected]>: > Yes WD1A works very well with the conductors strapped. I've built a 300m > long reversible beverage up at about 2.4m with two parallel runs of > strapped WD1A about 50mm apart. > > Impedance of this line is around 450 ohms at that spacing so transformer > design is simpler than one twisted WD1A and losses considerably less. > > Jeremy G3XDK > > > On 7 Jun 2015, at 16:55, Roger Parsons via Topband wrote: > > > I know that WD-1 and WD-1A wires are not very good for two wire > transmission lines due to their high attenuation. I wonder however whether > they are OK with the conductors strapped as Beverage wires? WD-1A has quite > a few advantages for the bush where I run my antennas - it is strong, it is > quite light, it is very nice and easy to run out, and it fits through > electric fence insulators. > > > > > > I presume that its poor performance as a balanced line is related to the > copper wires twisting with the steel ones meaning that for some of the time > current is passing through the steel wires due to skin effect. On the other > hand I can't see how it can be worse than galvanised steel wire or electric > fence wire. > > > > 73 Roger > > VE3ZI > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > -- Andrey Fedorishchev, RA6LBS www.RA6LBS.ru _________________ Topband Reflector Archives - http://www.contesting.com/_topband
