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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 |
#2
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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. |
#3
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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 |
#4
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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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