|
What us folks in the UK and Europe must remember
is, that the USA boys are biased towards loops(lassos). They were brought
up on the ranches lassoing cattle and naturally when it comes to radio this is
the way they think, and its hard to convince them otherwise.
Although my 90 metre loop (natural resonance) is
good it is not a patch on my vertical system.
The loop also has the disadvantage of being
bi-directional, whereas the vertical captures signals from all directions.
I find on receive the loop is well down in its
favourite direction from the vertical and on transmit poor.
I am not exactly comparing like with like because
the loop is 90 metres and well elevated, but my vertical is well over 100 ft and
supports 3 x inv L antennas each one 100ft plus, vertical and at least 300 ft
horiz. Total inductive base loading is less than 0.5 mh on 136 khz. I intend to
improve on this configuration when I get the time. The ground system consists of
several 300 ft plus insulated radials. Both the vertical and loop are matched to
50 ohms and fed with 50 ohm cable to the shack where all the equipment is
designed for 50 ohms.The antennas and base feed are some hundreds of feet away
from the shack, away from any possible domestic electrical noise.
I think the roundup days are over in America and
they ought to try some verticals on LF
The next steamer leaving Belfast for
Baltimore/Philadelphia is in 3 weeks time and I might send over some verticals.
This service has been operating since 1823 and is reliable, still using
sails.
73 De Mal/G3KEV
| 