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
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