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Today's Topics:
1. B210 RF Specifications (Claudia Casali)
2. Re: B210 RF Specifications (Marcus M?ller)
3. FOSDEM '15 -- Call for Participation (Martin Braun)
4. Re: USRP x310 RF A TX Red LED (Martin Braun)
5. B100 + WBX Aliasing (Germano Capela)
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Message: 1
Date: Mon, 13 Oct 2014 09:27:37 +0200
From: "Claudia Casali" <[email protected]>
To: <[email protected]>
Subject: [USRP-users] B210 RF Specifications
Message-ID: <003f01cfe6b7$2a5486e0$7efd94a0$@it>
Content-Type: text/plain; charset="us-ascii"
Dear all,
have you some details about the RF specifications of the USRP B210 ( max
power, min power when you transmit a carrier, etc.)
Thanks in advance!
Claudia
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Message: 2
Date: Mon, 13 Oct 2014 14:29:23 +0200
From: Marcus M?ller <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] B210 RF Specifications
Message-ID: <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Hello Claudia,
this is a bit a fuzzy question -- since this RF, things are inherently
frequency dependent. Now, as a rule of thumb, max single sinusoid output
is about 20dBm for the highest gain setting, for frequencies
significantly lower than 6 GHz.
Minimum power is a tough one -- I'd assume that depends on how you
measure, but it will usually be "off", but you'd have to realize that
the minimum amplitude is a single bit of the DAC -- it stands discussion
if the resulting rectangular signal is a sinus carrier. Generally the
minimum output should be outshined by the inevitable LO leakage.
The B210 is not a calibrated device -- so unless you measure yourself,
you will never know these numbers. Measuring RF power inherently needs
some experience, though -- while the SMA-SMA cables Ettus sells are
rated up to 6GHz, many HF cables available on the market are RG-178 or
even RG-174, and exhibit significant attenuation for frequencies higher
than 3GHz. Also, cables have a impedance specified within some
tolerance, and mismatching of course leads to frequency-dependent
measurement errors. So to sum this up: We can only offer you a maximum
power for a given frequency on a measured B2x0 as measured with our
measurement devices. If you want to know exactly what comes out of your
antenna, you'll need to calibrate your overall system, including, but
not limited to, the USRP.
Greetings,
Marcus
On 13.10.2014 09:27, Claudia Casali via USRP-users wrote:
> Dear all,
>
>
>
> have you some details about the RF specifications of the USRP B210 ( max
> power, min power when you transmit a carrier, etc.)
>
>
>
> Thanks in advance!
>
> Claudia
>
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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Message: 3
Date: Mon, 13 Oct 2014 17:16:28 +0200
From: Martin Braun <[email protected]>
To: "[email protected]" <[email protected]>,
"'[email protected]'" <[email protected]>
Subject: [USRP-users] FOSDEM '15 -- Call for Participation
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
Dear friends and colleagues,
next year's FOSDEM (the free and open source developer's meeting in
Brussels, Europe) will, once again, feature a track on Software Defined
Radio.
Therefore, we invite developers and users from the free software radio
community to join us for this track and present your talks or demos.
Software Radio has become an important tool to allow anyone access the
EM spectrum. Using free software radio libraries and applications and
cheap hardware, anyone can now start hacking on wireless
communications, remote sensing, radar or other applications. At FOSDEM,
we hope to network all these projects and improve collaboration, bring
new ideas forward and get more people involved.
The track's web site resides at:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FOSDEM15
Here, we will publish updates and the final schedule.
** Submit your presentations
To suggest a talk, go to https://penta.fosdem.org/submission/FOSDEM15
and follow the instructions. You need to create an 'Event'; make sure
it's in the Software Defined Radio track! Lengths aren't fixed, but give
a realistic estimate and please don't exceed 30 minutes unless you have
something special planned (in that case, contact one of us). Also, don't
forget to include time for Q&A.
Typical slot lengths would be 30 Minutes including QA.
You aren't limited to slide presentations, of course. Be creative.
However, FOSDEM is an open source conference, therefore we ask you to
stay clear of marketing presentations. Of course, we like nitty-gritty
technical stuff.
We will reserve time to simply hack, it won't all be talks.
** Important Dates
FOSDEM is January 31st & February 1st 2015.
- December 1st 2014: Submission Deadline
- December 19th 2014: Speaker Notification
- January 7th 2015: Announcement of final schedule
- February 1st 2015: SDR Track
** Steering Committee
The track committee consists of:
* Philipp Balister (OpenEmbedded / OpenSDR)
* Martin Braun (GNU Radio)
* Sylvain Munaut (OsmoCom)
Hope to hear from you soon!
Martin
------------------------------
Message: 4
Date: Mon, 13 Oct 2014 17:38:01 +0200
From: Martin Braun <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] USRP x310 RF A TX Red LED
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
A green LED means receive, and a red LED means transmit. In the early
versions of the X300 code, this was accidentally flipped, which was not
a problem per se, but inconsistent with our other devices.
So no, a red TX LED is not bad, no worries!
As for the bug you see with 'only receiving noise', that's strange and
probably not connected to the LED colour. There's a chance some gain
settings changed across versions, although I haven't heard that before.
Maybe you can elaborate on your test setup.
M
On 10/10/2014 11:04 PM, Ryan Marlow via USRP-users wrote:
> Hey All,
> I'm playing around with different versions of the released UHD. I have a
> simple flowgraph in GNU Radio with a USRP source and sink. and the TX
> and RX are looped together. I'm trying to just get dataflow through the
> USRP. UHD 3.7.1 seems to work great. The signal I send to the USRP
> matches what the USRP sends back to GNU Radio, great! But in UHD 3.7.2
> and 3.7.3 the TX LED is red instead of green and I appear to just be
> getting noise back to the host. What exactly does the RED LED indicate
> (I'm sure it's bad)? In all cases, I run the uhd_usrp_probe utility tool
> and no significant errors result from that. I'm not sure what I'm doing
> wrong.
> Thanks,
> Ryan Marlow
>
> --
> Ryan L. Marlow
> Research Assistant in CCM Lab <http://ccm.ece.vt.edu>
> Virginia <http://www.vt.edu/> Polytechnic Institute and State University
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
------------------------------
Message: 5
Date: Sun, 12 Oct 2014 17:20:50 +0100
From: Germano Capela <[email protected]>
To: [email protected]
Subject: [USRP-users] B100 + WBX Aliasing
Message-ID:
<CALRjtmMFDHw4uNFsSsR=r_sjce_3sryhlcgjc_zb1mqoj0v...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi,
When I run a simple spectrum measurement around 312MHz, I observe a
powerful replica of the GSM900 downlink (arround 935 MHz) spectra. Is it
possible that the anti-aliasing filters are not enough to prevent this
effect?
Regards,
Germano
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