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Old January 27th 07, 01:16 AM posted to rec.radio.shortwave
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Default Long wire to SO-239 50 ohm?

In article ,
David wrote:

On Fri, 26 Jan 2007 02:03:04 GMT, Telamon
wrote:

In article ,
David wrote:

On Thu, 25 Jan 2007 03:06:28 GMT, Telamon
wrote:


If you use a cable TV Balun you'll get a quick and dirty 4:1
transformer and a marked improvement.

http://www.radioshack.com/product/in...3912&cp=&sr=1&
ori
gkw=matching+transformer&kw=matching+transformer&p arentPage=search

Those don't work well below 10 MHz. 15 MHz and higher they are OK.

How do you know?


I tested them.

What is the low frequency limiting component?


I didn't go as far as that. This unit is made of a ferrite core and a
couple of very small value capacitors. I would guess the core was the
problem.


I've reverse engineered a bunch of them. The ones with caps are very
rare.


The one you referenced has the capacitors. I would go with another model.

--
Telamon
Ventura, California
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Old January 27th 07, 10:26 PM posted to rec.radio.shortwave
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Default Long wire to SO-239 50 ohm?

On Fri, 26 Jan 2007 17:16:54 -0800, Telamon
wrote:

The one you referenced has the capacitors. I would go with another model.


I was just showing the picture. If the thing has caps, replace them
with shiny jumpers.
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Old January 28th 07, 01:44 AM posted to rec.radio.shortwave
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Default Long wire to SO-239 50 ohm?

In article ,
David wrote:

On Fri, 26 Jan 2007 17:16:54 -0800, Telamon
wrote:

The one you referenced has the capacitors. I would go with another model.


I was just showing the picture. If the thing has caps, replace them
with shiny jumpers.


Don't let me stop you from doing this and let us know how it works out.

--
Telamon
Ventura, California
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Old January 28th 07, 03:15 PM posted to rec.radio.shortwave
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Default Long wire to SO-239 50 ohm?

On Sat, 27 Jan 2007 17:44:54 -0800, Telamon
wrote:

In article ,
David wrote:

On Fri, 26 Jan 2007 17:16:54 -0800, Telamon
wrote:

The one you referenced has the capacitors. I would go with another model.


I was just showing the picture. If the thing has caps, replace them
with shiny jumpers.


Don't let me stop you from doing this and let us know how it works out.


It's a quick and dirty junk drawer compromise that's better than
nothing. I prefer the Palomar MLB because they're homies.
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