[TenTec] bill orr article
rclose at nhwisp.com
Sun Feb 1 16:31:52 EST 2009
Drilling through a window--wow, you are a pretty confident person! I took a
different approach, where I drilled two 5/8 holes through the side of the
house at the same approximate spacing being careful not to grab the
insulation. I carefully pushed two 1/2 plastic conduit through the holes,
and cut them flush with the inside and outside walls, caulking them
carefully. Inside and outside, I mounted a couple of porcelain insulators
designed to pass a wire through a chassis. I ran a piece of 12 AWG solid
copper wire through the conduits to join the outside insulators to the
inside. I know that there are probably some impedance bumps, but that is a
problem in theory only at HF frequencies. At 2KW there is no warming at
all, I am well insulated from any wooden structure, and outside I have a
little piece of siding to act as a "roof" to keep the terminals dry. I
connect the window line to the insulators using a gadget I made up out of a
couple of dual banana plugs/jacks. When not using the antenna I pull the
connection off and plug the banana plug into a well-grounded copper plate
with holes the appropriate size and distance. Clean, fast and it's worked
just fine for ten years. I had the ladder line vaporized by a direct
lightning strike while grounded with no damage to anys inside equipment.
amazing and/or lucky!
From: <waltk8cv4612amos at att.net>
Sent: Sunday, February 01, 2009 3:56 PM
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Subject: Re: [TenTec] bill orr article
> Open wire through GLASS ........... now there's an OXYMORON :-)
> Get tape and a carbide tipped drill bit ! I used 1/ 16 I think.
> Water on the bit and drill the tape marked spot on the glass at about the
> ladder line spacing.
> Feed #18 tined wire through the window and solder the open wire to it
> and outside.
> Find a way to tie off the outside open wire to take the strain off the
> glass. I tied off to a metal clothes pole with a couple of strings, leave
> drip loop too. I use a knife switch inside to ground the mess. Yes, there
> are other ways but this has worked well for me. I think MFJ has a panel
> can shut the window on. Might work too ?
> Walt K8CV Royal Oak, MI.
> ----- Original Message -----
> From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
> To: <wb2vuf at arrl.net>; "Discussion of Ten-Tec Equipment"
> <tentec at contesting.com>
> Sent: Sunday, February 01, 2009 3:39 PM
> Subject: Re: [TenTec] bill orr article
>>> it is possible to mount a 1:1 balun just outside and run coax
>>> into the building. The swr on the coax will be high, depending on band,
>>> antenna length, and feedline length, but if the coax is kept short and
>>> is of good quality, the losses will be low, certainly much lower than
>>> the 68-70 feet of RG-8X or RG-58, commonly used with G5RV antennas.
>> Yes you can do this and it will work. What will the loss through the
>> balun be when the load is highly reactive? Probably greater than the
>> loss through the same balun when the feed line appears as a resistive
>> Is a 1:1 balun the best choice here? Maybe for frequencies where the
>> dipole is near resonance ( odd multiples of half wavelengths long, not
>> the resonances at even multiples ) and the open wire feed line is a
>> multiple of half wavelengths long. At other frequencies maybe not.
>> Running open wire feed line from the outdoors to the indoors does
>> require some additional problem solving skills, compared to using coax.
>> In many cases it is not really that hard to do, and worthwhile. I'm sure
>> glad I am a homeowner and no longer a renter. Makes a big difference
>> when it comes to drilling holes.
>> DE N6KB
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