There are no perfect solutions for Beverage wire and all have problems.
Military commo wire is normally used in short term tactical telephone
systems and sees usage from a few days to a few weeks. As units move, the
wire is recovered and reused. For longer term strategic installations
Has anyone ever made any attempt to characterize the line at HF?
A simple process like that would eliminate all speculation about RF
performance, and make rational cost vs. performance decisions.
Surely someone somewhere has made some reasonable attempt at characterizing
the line.
73 Tom
Sorry for maybe a dumb question .But can you use this trpe of cable as
radials/counterpoise, as I rent and cant really dug up garden to do job
properly so hit on this idea.
Idea is each individual strand in the cable will act as one radial.
BUT I probable know the answer.
Please give me your
I've been listening but not able to hear FP on 160m the past few nights.
Not seeing any westerly spots to see best time, so wondering if anyone West
of the Mississippi has worked Or heard them 160m. If so when was the good
time? Not so much up to midnight here in Kansas when I have been trying .
I think the characteristics of so-called WD-1 surplus phone line varies.
FWIW, the two short samples of WD-1 that I have here are as follows:
115 ohms impedance, calculated from the following: .033 diameter
(averaged), .0685 spacing. The dielectric constant of the insulation
(polyethylene) is
I use several 900 foot reversible made from WD-1A and found this as a
good solution and a good price for wire itself. I use the KD9SV boxes
that Gary designed. My big problem is that I have huge 2500 foot roll
where the cardboard core disintegrated leaving a mass of tangled WD-1.
Maybe
Idea is each individual strand in the cable will act as one radial.
BUT I probable know the answer.
Unfortunately there is no magic. The objective of a radial is spread the
electric and magnetic fields out, so they are not as intense. The only real
solution is to fill a large physical area of
On 7/23/2012 9:56 AM, Kevin Schavee wrote:
I've been listening but not able to hear FP on 160m the past few nights.
Not seeing any westerly spots to see best time, so wondering if anyone West
of the Mississippi has worked Or heard them 160m. If so when was the good
time? Not so much up to
I use several 900 foot reversible made from WD-1A and found this as a
good solution and a good price for wire itself. I use the KD9SV boxes
that Gary designed. My big problem is that I have huge 2500 foot roll
where the cardboard core disintegrated leaving a mass of tangled WD-1.
Maybe
I think the characteristics of so-called WD-1 surplus phone line varies.
FWIW, the two short samples of WD-1 that I have here are as follows:
115 ohms impedance, calculated from the following: .033 diameter
(averaged), .0685 spacing. The dielectric constant of the insulation
(polyethylene) is
If you're lucky, you might be able to grab the innermost end of the wire
and pull it out of the center of the coil (I'm assuming your rotted-away
reel left a coil of cable). There are actually commercial pull-out
type packages of wire made similarly to this. The wire will come out
with extra
I purchased from surplus, six each of the larger 3 foot diameter reels of
WD-1A a few years ago. One of the reels was damaged by the freight company
and all of them have not weathered well in my storage area.
I am in the process of using from the broken reel and have set up in the
following
Re Craig:
There are no perfect solutions for Beverage wire and all have problems.
One big factor in the Northeast is Limes Disease, spread by Deer ticks, from
Deer, and a few other creatures. It becomes risky to your way of life to put
too much time out on Beverages in wooded areas. We
On 7/23/2012 6:43 AM, Tom W8JI wrote:
Surely someone somewhere has made some reasonable attempt at characterizing
the line.
If I had a sample (which I don't), I would hook it up to a VNA and
measure both Zo and attenuation.
73, Jim K9YC
___
UR RST
And out here in the ARID areas of the US, Beverage antenna installation and
maintenance brings on the risk of life changing encounters with rattle snakes
and Gila Monsters http://en.wikipedia.org/wiki/Gila_monster . I have seen a
LOT of them in my life along the Gila River.
There is no free
Remember the old movie Tales of the Sierra Madre were Arthur Brennen warned
Boggy not to put his hand under the rock cause there is a Gila Monster there?
Herb, KV4FZ
Sent via BlackBerry by ATT
-Original Message-
From: Milt -- N5IA n...@zia-connection.com
Sender:
Mike, the measurements I took here on a short (300ft) WD-1A with average
height of 5ft using the method W8JI recommends with a termination resistor
(pot) and MFJ-259 showed an impedance of 140 ohms on both 160 and 80 meters.
I did not attempt to measure at higher freq's...de gary, kd9sv
That's what I would like to hear. Back some years got ahold of a sample of
some alleged high power 72 ohm transmission line before I bought a bunch of
it. It was 80 ohms and had terrible losses. It seemed to me to be made of
the same stuff as household zip cord. I reported my findings back to
Sounds like a version of Lyme disease, Tom.
Sorry to hear this.
Brian K3USC
On Jul 23, 2012, at 4:04 PM, Tom W8JI wrote:
Ticks carry many things, some that doctors are not familiar with.
Installing antennas in the woods here in Georgia, I contracted Ehrlichiosis
from a Lone-star tick. I was
Tom is correct. Ticks carry many bad blood bugs, both virus and bacteria.
Here in buggy North Florida tick fevor is very common and it is not Lymes
disease. Mountain tick fever, Texas tick fever, Southeast tick fever, the
list goes on... Ticks are also the vector for spreading deadly
Bet there are many tick stories in the DX group.
I was on active duty at Fort Sill, Oklahoma in 1957 and while I was shaving
in the BOQ latrine one of the guys noticed a tick on my back. They burned it
out with a cigarette. Had to go to early sick bay many days after,
receiving many penicillin
Gary, was your 140 ohm WD-1A made from .0393 (1mm) diameter wires, spaced
.118 center-to-center? My math says that should be a little over 140 ohms.
But the stuff I was talking about was a different diameter and spacing
(.033 diameter and .0685 center-to-center spacing.) The same math says it's
Great idea Bill. Unfortunately the yard man, every time he would cut
the grass with a string trimmer he would pick up the mass of WD-1A and
move it to another spot. it is in a Gordian Knot that would even be a
challenge to Alexander the Great!
73,
Herb, KV4FZ
On 7/23/2012 10:47 AM,
I worked the FP at 0155 last night on 160 M with a good signal here although
there was deep slow qsb.
He had a good signal for quite a while afterward. I heard him work a couple
stations in Texas shortly after I did.
His signal was also very good on 80 M.
Dick, K4IQJ ..
On Jul 23, 2012, at
Gary, was your 140 ohm WD-1A made from .0393 (1mm) diameter wires, spaced
.118 center-to-center? My math says that should be a little over 140 ohms.
But the stuff I was talking about was a different diameter and spacing
(.033 diameter and .0685 center-to-center spacing.) The same math says
- Original Message -
From: Bruce k...@myfairpoint.net
To: topband@contesting.com
Sent: Monday, July 23, 2012 3:56 PM
Subject: Topband: Beverage antennas
Re Tom:
An impedance error of 20 ohms on a 100 ohm line is as meaningful as an 80
ohm error on 400 ohm line
Thanks Tom for
What may be more destructive is a slow velocity factor in the insulated
wire. There is no way to estimate that, you just have to measure it. If
the VF is low, then you get into the same kind of problems as one has in
designing BOG's (beverage on ground), where the signal already on the wire
is
When I was in the Army in 1958 to 1960, the field commo wire was WD1/TT.
This was a twisted pair of steel and copper stranded insulated wire. It had no
jacket
over the twisted pair. The official way to splice it was with a square-knot and
twist the loose ends
after the end of the knot. Then
This off-topic discussion about ticks (I've never worked T1CK on 160m ;-)
is certainly an eye-opener. Since I've moved to Missouri, I've certainly
had my share of tick bites, many of them from being out in the 'antenna
pasture'.
Around July 2008, something happened to me that my doctor never
29 matches
Mail list logo
