I would just look for WD-1 military telephone wire, very strong, tough
insulation and cheap enough.
Mikek
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I've seen Cat 5 and 6 cable used up to 20MHz on one pair, power on another and data
on a third, perhaps switching on a fourth pair. I know this >works for distances
of at least 20 metres and I wonder if it would be good at LF for 10 times that
distance. It's also very tough and modestly
I ran into a problem like yours with tower raising. It turned
out that the feedline was acting as a vertical antenna and
the actual RX antenna did not have adequate feedline isolation.
When the tower is lowered, the unintentional vertical antenna
goes away.
As far as ferrites around the cables,
turns on that also
increased ingress. (I know wrong material. but it was there)
I tried a much smaller CMC, it didn't help or hurt.
So, What methods can I try to reduce the ingress even further?
Mikek KF4ITA
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.
Mikek KF4ITA
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useless.
On a previous BOG I used #18 twisted speaker wire and it
picked up very little RF when connected the the radio.
Do I need to do anything with the unused pairs,
that would help?
Any thoughts on how to prevent RF pickup by the feed line?
Mikek KF4ITA
That brings up the question, can you use a tightly coupled pair for a
reversible Beverage?
And would WD-1 wire work?
http://www.signalcenter.com/commo/wire/wireinfo/wdwireinfo.html
Mikek KF4ITA
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.
260ft = 79.248 Meters Frequency is 1190kHz.
Thanks, Mikek KF4ITA
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ts
appreciated.
Mikek KF4ITA
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to add a drawing of the first draft of my Antenna to feed line
conversion box.
https://www.dropbox.com/s/j1p1bmgb1yxt2n6/Bog%20Switching%20Box.jpg?dl=0
Your advice is appreciated.
Mikek KF4ITA
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be
appreciated.
Mikek KF4ITA
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.
Mikek KF4ITA
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d it's good until 2028. I have no recall of
renewing it.
"Getting old ain't for sissys!" ARRGH!
Mikek KF4ITA
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that copies the post I want to respond to. I'm missing something.
Thanks, Mikek
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Oh, ya, I did run into the choke resonance problem, and haven't solved
it. I was told if I use a current source, that the impedance looking in
would be high, I'll visit that when I get the variable inductor perfected.
Regarding my planned inductors They would be controlled by current
through
?
Mikek
Hi guys,
I see certain measurements for the length of a BOG, such as 200ft for
for 160 meters.
And even a warning on one page,
/*
"The biggest mistake is making the BOG antenna too long. Try not to go */
/*over 200 feet for 160 m
bog%20with%20variable%20inductors..jpg?dl=0
I want to be told what problems you see and ways to overcome them. _If
it is at all feasible_,
I would wonder about the values of the blocking caps and Chokes.
I appreciate any thought you can give this idea.
ubject for
a different thread.
>
> Mikek
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optimization
would be for AM band use.
Here is a comparison of my 250ft BOG to my 150ftlong wire, 30ft high.
Note: my B0G feed line was twisted speaker wire. That's a subject for a
different thread.
Mikek
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t, If I can optimize it for 550kHz to 1.7MHz, I'm happy, if
it makes it up 4MHz even better.
But I won't know until I push the idea, and I need help as I really
don't have talent to figure it out by myself.
I'll stop here before I seem to be mumbling.
Thanks for your help,
I have never modelled an inductively-loaded Beverage, but my intuition
is that it will not perform any better than an unloaded wire of the same
physical length.
I haven't modeled for 10 years and even then I was in the dark.
I started on this quest when I saw this W8JI page about inductively
ill the pattern. That required a second wire at the end of the BOG.
But it used a Vactrol that isolated the antenna from the control.
Mikek
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he caveats?
Thanks, Mikek
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ss section.
Where can I buy such a core?
Thanks, Mikek
PS, if anyone here wants to model a 250ft bogit over that frequency
range, you would have my undying gratitude.
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beads were far from optimal. I don't model, but would
love to have the information it provides.
Hope you glean a something from that, Mikek
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I have installed a 253ft Bog,
I used WD-1A a pair and just twisted the two wires together.
Any reason I should separate the pair and just use a single wire?
Can the WD-1A be used for a Bi-directional BOG, or is the spacing too close?
I have installed a variable termination on the North end
On 8/4/2018 9:08 PM, Mikek wrote:
Hi JC,
I have just recently put in a BOG.
But before I installed the BOG, I ran my 240 feet of coaxial feedline
out to where I expected to put my BOG transformer.
I terminated the coax and connected the other end to my radio. I started
logging S units
On 8/4/2018 5:53 PM, Mikek wrote:
A good reference for Beverage antenna length is by W3LPL, Search
online for his patterns, F/B info.
If a shorter Beverage wire length is used because of space
restrictions, a near perfect feed and restive termination can
appear as a low VSWR
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