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From: | Jonathan Coveney |
Subject: | Re: [Discuss-gnuradio] What impedance are the wires and antenna? |
Date: | Tue, 28 Jul 2009 15:55:26 -0400 |
Thanks Eric!2009/7/28 Eric Blossom <address@hidden>Antenna:On Tue, Jul 28, 2009 at 03:37:02PM -0400, Jonathan Coveney wrote:
> Well, maybe that's the wrong way to phrase it. I need to make or buy an FM
> antenna (I realized I accidentally grabbed the VERT900 from my lab, and they
> don't have an FM antenna).
>
> Some sites seem to imply that coax is usually 70 ohm, but it looks like here
> http://wireandcable.thermaxcdt.com/item/high-performance-coaxial-cables/mil-c-17-coaxial-and-twinaxial-cables/m17-113-rg316-id-72-?&seo=110
> That the Thermax RGS-316 may be 50 ohm? I just need to know so I don't ruin
> it...
>
> I checked ettus labs and couldn't see an answer.
http://www.radioshack.com/product/index.jsp?productId=2062691
75 ohm Matching transformer (close enough):
http://www.radioshack.com/product/index.jsp?productId=2062054
Then you need an F-to-BNC and BNC-to-SMA or something similar, unless
you're plugging it into a TVRX (which has an F-connector).
Coax is commonly either 50 ohm or 75 ohm. Cable TV uses 75 ohm.
For this application, either will work fine.
Eric
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