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Re: [Discuss-gnuradio] SBX TX/RX RX leakage


From: Ralph A. Schmid, dk5ras
Subject: Re: [Discuss-gnuradio] SBX TX/RX RX leakage
Date: Sat, 9 Feb 2013 08:35:31 +0100

Just put 50 Ohm dummy loads onto the connectors and check for a signal, then
you see if it is leakage or not :)

Ralph.

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf Of
> gang li
> Sent: Friday, 08 February, 2013 23:47
> To: Marcus D. Leech
> Cc: address@hidden; address@hidden
> Subject: Re: [Discuss-gnuradio] SBX TX/RX RX leakage
> 
> Yes. I am doing full duplex on the same frequency, transmitting from
> TX/RX and receiving on RX2 at the same time. When I put the antennas
> far way from each other, the received signal amplitude is very low.
> And when I change the distance between them, i found the received
> signal amplitude is kind of stable. So i think maybe the leakage takes
> the major. Am I right?
> 
> On Fri, Feb 8, 2013 at 4:26 PM, Marcus D. Leech <address@hidden>
> wrote:
> > 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
> >
> >
> 
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