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Today's Topics:
1. Re: R: Re: Problem with update firmware and FPGA image on a
WBX (Josh Blum)
2. Re: spurious output on wbx rx (Jason Abele)
3. Re: spurious output on wbx rx (Ingmar Meins)
----------------------------------------------------------------------
Message: 1
Date: Fri, 25 Mar 2011 10:31:12 -0700
From: Josh Blum <[email protected]>
To: [email protected]
Subject: Re: [USRP-users] R: Re: Problem with update firmware and FPGA
image on a WBX
Message-ID: <[email protected]>
Content-Type: text/plain; charset=UTF-8
On 03/25/2011 01:34 AM, Massimo Piras wrote:
> Thank you Josh, but I still have a problem. Where can I find the card
> burner tool and the net burner tool for Windows?
>
All code can be found in the uhd repository:
http://code.ettus.com/redmine/ettus/projects/uhd/wiki
-Josh
> ----Messaggio
> originale----
> Da: [email protected]
> Data: 24/03/2011 18.26
> A: <usrp-
> [email protected]>
> Ogg: Re: [USRP-users] Problem with update
> firmware and FPGA image on a WBX
>
>
>
> On 03/24/2011 10:20 AM, Massimo
> Piras wrote:
>> Hi, I have a problem with an SD card. I tried to update
> the firmware
>> and the FPGA image following the instructions at:
>>
>
>
> Try these instructions:
> http://www.ettus.com/uhd_docs/manual/html/usrp2.
> html#load-the-images-onto-the-sd-card-usrp2-only
>
>> http://gnuradio.
>>
> org/redmine/wiki/gnuradio/USRP2UserFAQ
>>
>> I'm afraid to have it all
>
>> wrong, because now the SD card is not recognized from the USRP2, and
>
>> when the card is inserted into, only the light F stays on. How can I
>
>> fix it? The card is still usable? Help me!!!!
>>
>>
>
> You cannot break
> the sd card. Make sure that this is the sd card
> shipped/working with
> usrp2. Some cards will not be usable. See the note
> in the link above.
>
> -
> Josh
>
>> Supera i limiti: raddoppia la velocit? da 10 a 20 Mega
> Risparmia con Tutto Incluso: Voce + Adsl 20 mega a soli 29,95 ? al mese
> per due anni. SCONTO DI 280 EURO! http://abbonati.tiscali.it/telefono-
> adsl/prodotti/tc/tuttoincluso/?WT.mc_id=01fw
>>
>>
> _______________________________________________
>> USRP-users mailing
> list
>> [email protected]
>> http://lists.ettus.
> com/mailman/listinfo/usrp-users_lists.ettus.com
>
>
> _______________________________________________
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>
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-
> users_lists.ettus.com
>
>
>
>
>
> Supera i limiti: raddoppia la velocit? da 10 a 20 Mega Risparmia con Tutto
> Incluso: Voce + Adsl 20 mega a soli 29,95 ? al mese per due anni. SCONTO DI
> 280 EURO!
> http://abbonati.tiscali.it/telefono-adsl/prodotti/tc/tuttoincluso/?WT.mc_id=01fw
>
>
> _______________________________________________
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------------------------------
Message: 2
Date: Fri, 25 Mar 2011 11:14:49 -0700
From: Jason Abele <[email protected]>
To: Ingmar Meins <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] spurious output on wbx rx
Message-ID: <20110325181449.GB2663@manzanita>
Content-Type: text/plain; charset=us-ascii
On Fri, Mar 25, 2011 at 10:05:41PM +1100, Ingmar Meins wrote:
> Is it normal for the WBX in an E100 to generate a large amount of RF
> on the centre RX frequency when in RX mode?
>
> For example if I run the uhd rx_ascii_art_dft example with a centre
> frequency of 469.4Mhz and sample rate of 250k there is such a strong
> carrier output radiated on 469.4MHz that I can no longer receive
> anything on that frequency using a hand held scanner in the same
> room.
>
> Happens with any RX application I use or write.
Wideband direct conversion receivers will all have LO->RF leakage and
because it is direct conversion, the LO leakage will be in the center of
your channel.
You can mitigate this effect by tuning with an LO Offset to get a
virtual low-IF architecture and thus place the LO outside your band of
interest, where it can be more readily filtered away.
In calls to set_center_freq(), you can pass a uhd::tune_request_t with
an lo offset.
For example: set_center_freq(tune_request_t(469.4e6, 10e6))
This moves the LO energy 10MHz away from 469.4M and would allow you to
use a bandpass filter between the antenna and USRP to remove the LO.
Jason
------------------------------
Message: 3
Date: Sat, 26 Mar 2011 08:32:34 +1100
From: Ingmar Meins <[email protected]>
To: Jason Abele <[email protected]>
Cc: [email protected]
Subject: Re: [USRP-users] spurious output on wbx rx
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 26/03/2011 5:14 AM, Jason Abele wrote:
> On Fri, Mar 25, 2011 at 10:05:41PM +1100, Ingmar Meins wrote:
>> Is it normal for the WBX in an E100 to generate a large amount of RF
>> on the centre RX frequency when in RX mode?
>>
>> For example if I run the uhd rx_ascii_art_dft example with a centre
>> frequency of 469.4Mhz and sample rate of 250k there is such a strong
>> carrier output radiated on 469.4MHz that I can no longer receive
>> anything on that frequency using a hand held scanner in the same
>> room.
>>
>> Happens with any RX application I use or write.
> Wideband direct conversion receivers will all have LO->RF leakage and
> because it is direct conversion, the LO leakage will be in the center of
> your channel.
>
> You can mitigate this effect by tuning with an LO Offset to get a
> virtual low-IF architecture and thus place the LO outside your band of
> interest, where it can be more readily filtered away.
>
> In calls to set_center_freq(), you can pass a uhd::tune_request_t with
> an lo offset.
>
> For example: set_center_freq(tune_request_t(469.4e6, 10e6))
>
> This moves the LO energy 10MHz away from 469.4M and would allow you to
> use a bandpass filter between the antenna and USRP to remove the LO.
>
> Jason
>
Thanks Jason, makes sense.
------------------------------
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End of USRP-users Digest, Vol 7, Issue 45
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