----- Original Message -----
Sent: Thursday, June 21, 2012 9:59
PM
Subject: Re: LF: Re: InV L Top wire
config - Best Option ??
R Alan,
Down to one of Mr Hobson's fine
designs here , the under slung wire
, would be the simplest to arrange , say
it ran 10 ft above a 90 ft
elevated ground radial , now would
that xtra C , increase the amp's in
the vertical section , the other side of
the top coil ...?
Other wise its ,just possible to run 90
deg about 20 feet , 90 then down , at
the far end
I tune using a swr meter , usually get a
sharp dip with the variometer , but I
also have a old 1000 pf 4 gang
clipped , low over the auto transformer , that is
handy , just takes the final 'ref down
and as its low , there is no flash over ,
bit like a band-spread on a rx oscillator coil
Testing wise , luckily , I can reach the Delft
web-sdr in the day time , so can
do s/n checks at range using
ROS-MF-2 , the s/n is the
average along the time line , so quite
accurate
Still raining
73 -G..
Sent: Thursday, June 21, 2012 8:59 PM
Subject: Re: LF: Re: InV L Top wire config - Best Option
??
Hi Graham its not exactlyaerial weather here
either :-((
The problem with unconventional "shapes" is you
will have to just try 'em out. I have always concentrated on reducing ground
loss as the most effective use of time and effort. Best done by measurement,
and not urban myths :-)) Thats why I always plug a simple
transformer coupled bridge, oscillator and receiver as a detector, noise
bridges have never worked at LF for me ....probably too many BC stations close
by. I also like bridge measurements......its probably an "age thing"
:-)) I feel closer to the problem and able to employ some skill and
maybe dexterity, even if I dont get the numbers on the readout of a
VNA......at least I learnt to sense when the measurement "feels" right. It is
the classic substitution measurement with passive references.
Alan
G3NYK
----- Original Message -----
Sent: Thursday, June 21, 2012 6:48
PM
Subject: Re: LF: Re: InV L Top wire
config - Best Option ??
R Alan.
Horizontal spread ......missing at the moment
... will have another look out
side , when the rain stops , horizontal
open box may be possible ..just
Tnx -G..
Sent: Thursday, June 21, 2012 4:42 PM
Subject: LF: Re: InV L Top wire config - Best Option
??
Hi Graham it basically doesnt matter too
much :-))
The thing is to get as much wire as high as
possible. Yes fold it back, meander it....spacings less than about 2 feet
dont add much over a single wire. Drop the end if you have to but remember
this may reduce the signal slightly in that direction....but it will
increase slightly the capacity to ground. be careful of the dropped ends
they are high voltage points and may not be "family friendly"
...... doubling the capacity to ground ( note ground....not lossy
roofs/foliage underneath) will probably halve you ground losses. It will do
very little to increase the radiation resistance.
Your diagram is difficult to read but running
one of the wires directly under another will be of no benefit and may be
worse than not having it......horizonltal spread is what you want, so pull
it at least 2 feet aside before folding it back.......I think you get the
idea.
Alan
G3NYK
----- Original Message -----
Sent: Thursday, June 21, 2012 4:17
PM
Subject: LF: InV L Top wire config -
Best Option ??
InV L Top wire config - Best Option
??
Any thoughts on the best configuration for
the top wire ??
Tnx -G,
