Re: Topband: Aluminum fence wire for Beverage

2021-04-14 Thread Mikek
I would just look for WD-1 military telephone wire, very strong, tough insulation and cheap enough.     Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _ Searchable Archives: http

Re: Topband: Common mode choking of beverages

2020-10-06 Thread Mikek
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

Re: Topband: Horizontal Waller Flag

2020-09-12 Thread Mikek
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,

Topband: CAT6 Feed Line

2020-05-19 Thread Mikek
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 _ Searchable Archives: http://www.contesting.com/_to

Re: Topband: Cat5 as Feed Line.

2020-05-18 Thread Mikek
. Mikek KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Anyone with experience using CAT6 as feed line.

2020-05-17 Thread Mikek
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

Re: Topband: 2 wire reversible Beverage- KF4ITA Mikek

2020-05-09 Thread Mikek
 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 _ Searchable Archives: http://www.contesting.com

Topband: Measure dipole on ground to get VF of BOG.

2020-05-02 Thread Mikek
. 260ft = 79.248 Meters  Frequency is 1190kHz.    Thanks, Mikek KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Measure dipole on ground to get VF of BOG.

2020-05-02 Thread Mikek
ts appreciated.     Mikek   KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Hi Z amplifiers for 160

2020-03-13 Thread Mikek
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 _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Hi Z amplifiers for 160m

2020-03-12 Thread Mikek
be appreciated. Mikek KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Measure DOG to calculate BOG

2019-12-07 Thread Mikek
. Mikek KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Re: Topband: BOG Beverage on Ground Help

2019-12-02 Thread Mikek
d it's good until 2028. I have no recall of renewing it. "Getting old ain't for sissys!" ARRGH!  Mikek KF4ITA _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Proper posting etiquette

2019-11-24 Thread Mikek
that copies the post I want to respond to. I'm missing something.   Thanks, Mikek _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: BOG with variable inductors

2019-11-24 Thread Mikek
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

Topband: BOG Beverage on Ground Help

2019-11-21 Thread Mikek
?    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

Topband: BOG Beverage on Ground Help

2019-11-20 Thread Mikek
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.     

Topband: Bog ideas

2019-11-11 Thread Mikek
ubject for a different thread. > >       Mikek _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Bog ideas

2019-11-11 Thread Mikek
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 _ Searchable Archives: http

Re: Topband: Topband Digest, Vol 200, Issue 28

2019-08-26 Thread Mikek
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,

Re: Topband: An oddball question about a BOG.

2019-08-25 Thread Mikek
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

Re: Topband: An oddball question about a BOG.

2019-08-24 Thread Mikek
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 _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: An oddball question about a BOG.

2019-08-24 Thread Mikek
he caveats?   Thanks,  Mikek _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: An oddball question about a BOG.

2019-08-23 Thread Mikek
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. _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: BOG questions

2019-08-23 Thread Mikek
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 _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector

Topband: Several BOG questions

2018-08-06 Thread Mikek
 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

Topband: RX antennas 1 + 1 = 5

2018-08-05 Thread Mikek
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

Topband: : Cores on Beverage antennas.

2018-08-05 Thread Mikek
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