Hello Paul,
This sounds really improving!! And this
will give a much more efficient antenna as before. Also the HV problems will
be reduced. Note that the goal should not be to make the C as high as
possible but first to make the antenna efficiency as high as possible. This
is done be increasing the effective height and reducing all the losses. Thus
i would recommend now a combination out of option 2 and 3. Maybe you could
check with G3YNKs R-C bridge, if the losses are increased with option 3. You
could use a braid of some meters to keep a distance to the trees although
the wire is mounted on the trees.
But all in all it sounds very
promising!
Option 1 is not so much improving i
would say. The C would slightly increase but not the antenna efficiency i
mean...
What about the option to place the coil
on the 40m tower? That would be the best improvement you can
do!
Good luck!
Do you already know who could be the
next receiving ham station? ;-)
73, Stefan/DK7FC
Stefan,Group.
An update on
the W1VLF hopefully to be 9 KHZ antenna.
The 55 meter
wire sloping at 45 degrees measured 340 pf as you
recall.
The addition
of 2 top hat wires has been made, each over 50 meters long with a slope to
the ground.
Wire 1 is
terminates at 11 meters above the ground and wire 2 terminates 20 meters
above the ground.
Antenna _only_
= 340 pf
Antenna
and Wire 1 West = 650 pf
Antenna
and wire 1 West and wire 2 East = 900
pf
L to resonate
at 9 KHZ now = 350 mHy.
The L is now
coming down to a reasonable size!!
For the
next step there are 3 possibilities:
1) Change the
top 30 meters from a single wire, to 3 wires spread 1 meter apart at
the top to gain perhaps 100 more PF?
2) Get my
neighbors permission to use his tree as a support for the end rope on wire
1. This will increase wire 1 west about 40 meters and raise the
end from 10 meters to 20 meters. 200 PF more?
3) Run 2 more
wires Wire 3 Northwest and Wire 4 Northeast each would be 20 to
30 meters long and terminate at 30 meters high. These would be
over a forest and I am not sure if this is my best
option.
It may yield
more "C" and lot more losses??
Goal is to
try to get antenna "C" to 1200 pf or more
All ideas
welcome.
PauLC
W1VLF
Mike, LF,
Wow! 5641km is really impressing!
Congrats!!
Is there such an activity planned for
the "west-stations" as well? We could do the same!
I've never been slower than DFCW-10
on LF. Would be interesting :-)
73, Stefan/DK7FC
An excellent day's activity on 137kHz yesterday with 5
countries
received, the furthest easterly station received here and a
QSO with
a new country.
In the morining, OE5ODL and DJ6GT were
received.
During the UA tests, five stations were logged (see the
attached
screen grab - Argo set to QRSS30 and centred on
137.778kHz).
The picture shows (from the top) UA0AET (5641km from me);
RA3YO;
RN3AGC; UA4WPF; and EW6GB who was first received as early as
1700UTC.
After the formal test I exchanged 'O' reports with EW6GB
at 1902km,
using QRSS10.
Well done to all
concerned.
Mike,
G3XDV
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