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Re: [Discuss-gnuradio] SBX TX/RX RX leakage
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From: |
Marcus D. Leech |
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Subject: |
Re: [Discuss-gnuradio] SBX TX/RX RX leakage |
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Date: |
Fri, 08 Feb 2013 16:26:26 -0500 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 02/08/2013 04:10 PM, gang li wrote:
When the signal received on RF2 port has a very weak strength, the
energy leaked from TX to RX will dominate in the total received
energy. I have observed this in my experiments. Are there any ways to
measure the leaked signal so i can compensate it? I am thinking a way
of by connecting the RF1 and RF2 ports with a long cable and 60db
attenuators. And then i record the received signal. I assume it is the
leaked signal from TX. Are there any better ways? Thanks for your
reply.
Best,
Gang
Are you TX/RX on the same frequency, or different frequencies?
The usual way to deal with this on different-frequency setups is to use
a duplexor, or a deep notch filter on the RX port, and probably boost your
antenna signal a bit with an external amplifier.
But if this is *same-frequency* duplex, the on-board leakage is really
minor compared to the coupling between your antennae.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org