Re: [Discuss-gnuradio] Question about SMA-SMA coaxial cable

[Marcus D. Leech]

On 06/08/2011 12:03 PM, Nick Foster wrote:
> No coaxial cable should act as an antenna except through shield leakage,
> which is VERY low, especially at low frequencies. To verify that this is
> the case, attach a 50 ohm SMA termination to the end of your coaxial
> cable and measure the amount of signal coming into your USRP. It should
> be next to none. If it isn't, it's possible your SMA cable is damaged
> and has a disconnected shield.
>
> --n
>
> _______________________________________________
The exception to this is if the coax isn't terminated in its 
characteristic impedance.  In which case, you get shield currents
  flowing along with radiation from those currents.  The magnitude of 
those currents is first-order proportional to the
  magnitude of the impedance mismatch.

--

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org