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Today's Topics:
1. Re: How to isolate the signal between TX/RX and RX2 on the
USRP N210? (Nick Foster)
2. Re: How to isolate the signal between TX/RX and RX2 on the
USRP N210? ([email protected])
3. Query Regarding OpenBTS (Ayiesha Murtaza)
4. ./Configure Gnuradio Error (ZaInzAiN Jj)
----------------------------------------------------------------------
Message: 1
Date: Thu, 03 Jan 2013 10:16:07 -0800
From: Nick Foster <[email protected]>
To: vancaho <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] How to isolate the signal between TX/RX and
RX2 on the USRP N210?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
On 01/03/2013 04:57 AM, vancaho wrote:
>
> Hello everyone,
>
> I want to use one USRP N210 to transmit and receive
> signals simultaneously with the SBX daughterboard. But when I try to
> transmit signals from TX/RX and receive signals from RX2(the
> transmitted and received signals are on the same center frequency), I
> found that the there is signal leaked from TX/RX to RX2. What can I
> do if I want to isolate the signals between TX/RX and RX2?
>
Transmit and receive on different frequencies. There will always be some
leakage between the two channels, not to mention that if your
transmitting antenna is within range of or not perfectly isolated from
your receiving antenna some power from the transmitter will always be
received. There is a hardware modification you can perform to SBX that
will improve isolation somewhat, if that is absolutely necessary. Can I
ask what your application is, and how much isolation between TX and RX
you require?
Best,
Nick
> Thanks very much!
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 2
Date: Thu, 03 Jan 2013 13:25:32 -0500
From: [email protected]
To: <[email protected]>
Subject: Re: [USRP-users] How to isolate the signal between TX/RX and
RX2 on the USRP N210?
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
On 03 Jan 2013 13:16, Nick Foster wrote:
> On 01/03/2013 04:57 AM,
vancaho wrote:
>
>> Hello everyone,
>>
>> I want to use one USRP N210
to transmit and receive signals simultaneously with the SBX
daughterboard. But when I try to transmit signals from TX/RX and receive
signals from RX2(the transmitted and received signals are on the same
center frequency), I found that the there is signal leaked from TX/RX to
RX2. What can I do if I want to isolate the signals between TX/RX and
RX2?
> Transmit and receive on different frequencies. There will always
be some leakage between the two channels, not to mention that if your
transmitting antenna is within range of or not perfectly isolated from
your receiving antenna some power from the transmitter will always be
received. There is a hardware modification you can perform to SBX that
will improve isolation somewhat, if that is absolutely necessary. Can I
ask what your application is, and how much isolation between TX and RX
you require?
>
> Best,
> Nick
>
>> Thanks very much!
>>
>>
_______________________________________________
>> USRP-users mailing
list
>> [email protected]
>>
http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
It
sounds like TX and RX are on the same frequency, so no amount of
improving the on-board isolation will prevent you from receiving your
own transmissions. Although there are "tricks". You can mix your TX
signal with the RX signals, but 180deg out of phase, which will provide
some suppression. But with RX and TX on the same frequency, the physics
precludes you from seeing your own transmissions, unless the TX and RX
antennae are very far apart, and TX power is very low.
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Message: 3
Date: Fri, 4 Jan 2013 11:34:15 +0500
From: Ayiesha Murtaza <[email protected]>
To: [email protected]
Subject: [USRP-users] Query Regarding OpenBTS
Message-ID:
<CAC2Y=cLcO7d=Es7_AdQEHte2w8LnwHatcu69xS6r1=MGfOS=e...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Dear all
i have some important queries. We made an OpenBTS system using USRP1 board.
Now we wish to expand it to establish a 2-cell network.
1.can 2 daughter boards on a usrp1 work independently so we cane make them
act as 2 separate OpenBTS systems representing 2 neighboring cells? this
would allow us not to buy another USRP board.
2.then once we have 2 neighboring OpenBTS systems established, thorough 2
daughterboards or through 2 separate usrp boards, how do we change the
Freeware code of OpenBTS and the usrp boards to detect each other and let 2
people connected to the either of the systems call one another?
Please reply asap. and i would be grateful if you could send a detailed
response.
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Message: 4
Date: Sat, 5 Jan 2013 00:15:58 +0800 (SGT)
From: ZaInzAiN Jj <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] ./Configure Gnuradio Error
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="us-ascii"
Dear all,
I use Gnuradio 3.3.0 and debian squeeze
when i install gnuradio, there are error.
cd gnuradio-3.3.0
./configure
.
.
.
checking Python.h presence... yes
checking for Python.h... yes
checking for swig... /usr/local/bin/swig
checking for SWIG version...
configure: error: cannot determine SWIG version
What i can do to solve this problem?
Thanks,
Ahmad Zainudin
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End of USRP-users Digest, Vol 29, Issue 4
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