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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] Question about SMA-SMA coaxial cable |
Date: | Wed, 08 Jun 2011 17:25:02 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Thunderbird/3.1.10 |
On 06/08/2011 12:03 PM, Nick Foster wrote:
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 theNo 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 _______________________________________________
magnitude of the impedance mismatch. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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