Greetings All,
It seems this discussion has morphed into a discussion on ground planes for
regular vertical antennas where if I read the authors description correctly he
is using a Hi-Z amplifier. This may mean a whole different ground system would
be very satisfactory. I believe it was
Another thought.
Changing to a good ground system with a good choke at the antenna
feedpoint will make your vertical omnidirectional, but that may not
solve the noise problem,. You may need a directional receiving antenna
to reduce it.
Jerry, K4SAV
On 5/6/2020 8:00 AM, K4SAV wrote:
Without more detail of your system, the cause is only a guess. Here are
some possibilities.
A single wire isn't much of a ground plane. It will make a vertical
directional. When you change from a single wire to a different ground
system you will change the antenna pattern. You should
Chicken wire laid on the ground makes an excellent RF ground
for Beverages and other antennas requiring a good RF ground.
73
Frank
W3LPL
- Original Message -
From: "Nick Hall-Patch"
To: "Chris Moulding" , topband@contesting.com
Sent: Tuesday, May 5, 2020 6:40:47 PM
Subject:
The usual kind of field produces radial currents,
and that's why we use radial wires.
But what kind of field would make the current run in circles?
Or is it that the only effective piece of wire is the radial one,
connecting the loop to the coax shield?
Perhaps we need a clear understanding
I've modeled two versions of the High Z Antenna Amplifier with a 5m
vertical element one with a 10m long loop counterpoise and the other
with a 10m straight counterpoise.
My version of 4NEC2 with NEC2 won't model it correctly close to ground
but I've already spotted that it would be possible
Your "loop ground" made me recall the US military "surface wire
ground", Chris, which was (is?) used for mobile applications, and is
often configured as a loop of wire, held down by metallic stakes,
around a vehicle.
Upon looking more closely,
Reminiscent of the DDRR antenna?
73, Roy K6XK Iowa
On 5/4/2020 3:57 AM, Chris Moulding wrote:
I've developed a High Z Antenna Amplifier for 160m and other HF use as
previously mentioned on the list.
Usually these would be used with a ground rod and 5m vertical element.
With the
I've developed a High Z Antenna Amplifier for 160m and other HF use as
previously mentioned on the list.
Usually these would be used with a ground rod and 5m vertical element.
With the lockdown it's not possible to nip to the shops for a ground rod
so I looked at supplying a 10m wire as a
