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Today's Topics:
1. Re: (no subject) (James Humphries)
2. LIBUSB error when connecting to multiple B210s (Joshua Sendall)
3. Re: LIBUSB error when connecting to multiple B210s (Derek Kozel)
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Message: 1
Date: Sat, 16 Apr 2016 13:08:36 -0400
From: James Humphries <[email protected]>
To: Xingjian Chen <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] (no subject)
Message-ID:
<caewgfhucd-8dqpv3rywapdwdmumtbagxb2mnbojc-qpdgit...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello,
The isolation between TX and RX is going to be mostly limited by the
transmit/receive switches on the B200mini. The switch is
Skyworks SKY13350-385LF:
http://www.skyworksinc.com/uploads/documents/SKY13350_385LF_201174G.pdf
And see page 3 here:
http://files.ettus.com/schematics/b200mini/b200mini.pdf
You'll probably see around 30-40db (hopefully better) isolation when you
factor in the two switches. This is a common issue with full duplex
operation, especially if you are transmitting and receiving on the same
frequency. Once you add the antennas back in, those may well become the
highest source of this self-interference, regardless of the isolation on
the b200mini itself.
-Trip
On Fri, Apr 15, 2016 at 7:13 PM, Xingjian Chen via USRP-users <
[email protected]> wrote:
> Hi there,
> What is the isolation between the transmitter and receiver of B200mini? I
> tuned the gain to maximum for both transmitter and receiver, terminated
> transmitter and receiver with matched loads. When I transmit and receive at
> the same time, I can still see clearly transmitted waveform in my received
> file. Any ideas to prevent this? What I probably have to do is decreasing
> the gain and adding external amplifiers.
>
> Best
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
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Message: 2
Date: Sat, 16 Apr 2016 12:52:28 +0200
From: Joshua Sendall <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [USRP-users] LIBUSB error when connecting to multiple B210s
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
I have encountered an issue after updating to the latest firmware version
(003.009.003 on Windows 10) on the B210s. The issue I have is when creating a
second multi_usrp instance a "LIBUSB_ERROR_CODE -1" error gets repeatedly
printed after printing "Operating over USB 3" to the console.
Has anyone seen such an error or know what might solve it?
Kind regards,Joshua Sendall
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Message: 3
Date: Sat, 16 Apr 2016 21:35:23 -0700
From: Derek Kozel <[email protected]>
To: Joshua Sendall <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] LIBUSB error when connecting to multiple
B210s
Message-ID:
<CAA+K=tvZVTNVVnD0=zNBR62-6qD5gnOQcBg_pFJs=xg09je...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello Joshua,
Are you creating the two multi USRP objects in the same process? Can you
attach or paste the UHD output here?
Thanks,
Derek
On Apr 16, 2016 11:42 AM, "Joshua Sendall via USRP-users" <
[email protected]> wrote:
> Hi all,
>
> I have encountered an issue after updating to the latest firmware version
> (003.009.003 on Windows 10) on the B210s. The issue I have is when
> creating a second multi_usrp instance a "LIBUSB_ERROR_CODE -1" error gets
> repeatedly printed after printing "Operating over USB 3" to the console.
>
> Has anyone seen such an error or know what might solve it?
>
> Kind regards,
> Joshua Sendall
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
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End of USRP-users Digest, Vol 68, Issue 18
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