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Re: [Discuss-gnuradio] What impedance are the wires and antenna?

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] What impedance are the wires and antenna?
Date: Tue, 28 Jul 2009 12:52:10 -0700
User-agent: Mutt/1.5.18 (2008-05-17)

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.



75 ohm Matching transformer (close enough):


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.


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