Hello All,
Just found old datas on a similar line made for the French Army , results
are the following:
The impedance was determined by measurements to be around 150 Ohms
old message:
I measured the losses of the 150 Ohms old military telephone line:
I made two transformers 50 to 150 ohms
I'm just thinking about the probably slow velocity factor of the stuff
Jacques describes, the loss, and the poor performance it would give if used
for a reversible beverage.
The losses as a reversible beverage would far exceed those used as a
balanced feedline, because of the balance partly
Hi Guy,
Good topic.
The losses as a reversible beverage would far exceed those used as a
balanced feedline, because of the balance partly cancelling fields in the
dielectric between them.
Slow wave structures are more common in microwave. Anything that increases
capacitance or inductance
Yeah, so he says when the wire is new. There is an ASSUMPTION that stuff
retains characteristic at RF over time when it was only designed for audio.
Have you ever noticed how pungent that stuff smells when you first pull it
off the roll. That stuff cures over time. Guys at Bell Labs had HUGE
- Original Message -
From: Tom W8JI w...@w8ji.com
To: Guy Olinger K2AV olin...@bellsouth.net
Cc: topband@contesting.com
Sent: Tuesday, July 24, 2012 9:12 AM
Subject: Re: Topband: Beverage antennas
Hi Guy,
Good topic.
The losses as a reversible beverage would far exceed those used
There is an excellent article in the July/August 2012 issue of QEX describing
how the author improved the performance of a Beverage by breaking it into two
in-line segments coupled by a pair of conventional Beverage matching
transformers. He also provides detailed construction information for
From what I've read, the characteristics of WD-1x may vary quite a bit.
It's interesting to read the results of the comparison that Herb did
between some and open wire line back in 2008:
http://lists.contesting.com/_topband/2008-12/msg00016.html
From that link:
In theory two parallel 600
There is an excellent article in the July/August 2012 issue of QEX
describing how the author improved the performance of a Beverage by
breaking it into two in-line segments coupled by a pair of conventional
Beverage matching transformers. He also provides detailed construction
Frank, W3LPL recommends -
Clothing can be purchased pretreated with Permethrin. Commercially treated
clothing remains effective after dozens of washings. Look for the trademarks
Insect Shield and Bug Shield in sporting goods stores or online:
I have been having a terrible problem with
Wayne,
What is more important than a little weak noise is common-mode signal. Why
don't you also test to see how well you can hear any AM broadcast stations
with the coax terminated?
Please also tell us more about your Beverage, especially how you are
feeding it (transformer, etc.)
FWIW, I
Guy, yes I am using WD1A on a 800 ft reversible around 12 high that has helped
me work some tough ones in both directions E-W. I am using KD9SVs matching
units. I have nothing to compare it with right now. 73 Mike K4PI
___
UR RST IS ... ... ..9 QSB
I have run about 400 ft of F6-type flooded coax from my shack to one end
of
my Beverage antenna. My question is: do I need to install a feedline
current choke about 20 feet from the end of the Beverage antenna (the
current choke would have its own separate ground.
While a dummy load test
Wayne is using a DX Engineering bi-directional system. Unless DXE changed
to ununs without telling anyone, he has little to worry about there. ;-)
73, Mike
www.w0btu.com
On Tue, Jul 24, 2012 at 1:19 PM, Tom W8JI w...@w8ji.com wrote:
Most common issues, other than defective connectors or shield
Wayne is using a DX Engineering bi-directional system. Unless DXE changed
to ununs without telling anyone, he has little to worry about there. ;-)
Yes. Cable grounds are isolated from signal grounds. That unit uses
primary-secondary isolation transformers.
Ticks are a part of life in this area also and not all are hazardous.
The deer tick is the carrier of Lyme Disease in this part of New England but
not all of them are infected. That ticks favorite host is mice and when
their population is low, usually when winter kill is high, they go for deer.
Much of the outdoor wire dielectric won't change much with age. If
you're looking at the really old rubber stuff you'll get a lot of change
since that material degrades over time. The newer stuff tends to be
polyethylene-based which holds up *very* well over time.
The C Rural wire that's been
I do have an old page up about this:
http://www.w8ji.com/k9ay_flag_pennant_ewe.htm
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
It is named for the Connecticut town where in the mid-1970's there was
an epidemic of arthritis associated with skin erythema (redness), caused
by the spirochete Borrelia burgdorferi. A spirochete causes syphillis.
It is transmitted from rodents to people by tiny, hard deer ticks. */It
is the
I still prefer rattlesnakes and Gila Monsters!! You can see them, and
you hear them rattle and hiss.
Mis dos centavos.
de Milt, N5IA
-Original Message-
From: John Harden, D.M.D.
Sent: Tuesday, July 24, 2012 2:37 PM
To: topband@contesting.com
Subject: Re: Topband: Lyme Desease
- Original Message -
From: Bill Wichers bi...@waveform.net
Also, someone on here had corrected me for talking about an older
version of C Rural wire that was oval and used rubber insulation. I
looked that up too (Drop Wire), and it is similar but definitely not the
same (I've only run
@N1BUG.
The WD1A is fairly tough, ~200lbs break strength. Tie it to the
supports/trees/insulators/whatevah with a single strand of 20-25lb test
monofiliment fishing line. Tree falls on WD1A, maybe you then need only
replace monofiliment fishing line supports to re hang the wire instead
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