Hi Matt
Additional to below:
I tried to resume normal testing with A as Rx and D as Tx. Now, it seems
I have an offset of about 2 MHz using internal clocks and running
usrp2_fft.py on A, when I transmit a BPSK signal from D. Moreover, I am
unable to tune D for the low (2.4 GHz) band anymore. In fa
Hi Matt
Additional to below:
I tried to resume normal testing with A as Rx and D as Tx. Now, it seems
I have an offset of about 2 MHz using internal clocks and running
usrp2_fft.py on A, when I transmit a BPSK signal from D. Moreover, I am
unable to tune D for the low (2.4 GHz) band anymore. In fa
Hi Matt
I have completed the probing as you suggested. The results are in the
following table. Please note that the voltages did not seem to be stable
when I tried reprobing in some cases. An example of this is for R45,
where I give two sets of results for Combo D. Also, please note the
following
Hi Matt
Apologies is you got a similar reply about 10 minutes ago, but the webmail
logged me out whilst I was trying to send it and it didn't appear in my sent
items when I logged back in.
>You should know that we only spec the boards from 2.4 to 2.5 GHz and 4.9
>to 5.9 GHz. When we test XCVR
-
>>
>>*From:* Manav Seth [mailto:smartyma...@gmail.com
>> <mailto:smartyma...@gmail.com>]
>>*Sent:* Wednesday, 3 February 2010 10:54 AM
>>*To:* Ian Holland
>>*Cc:* j...@ettus.com <mailto
On 02/03/2010 10:19 PM, Ian Holland wrote:
Hi Matt
Sorry I wasn't completely clear in my previous post below. Specific
details are as follows:
When I say "it fails to lock over the full high band and low band", what
I mean is as follows. I ran a test program to step through the
frequencies
2.3
BPSK).
Best Regards
Ian.
-Original Message-
From: Matt Ettus [mailto:m...@ettus.com]
Sent: Thursday, 4 February 2010 4:24 PM
To: Ian Holland
Cc: j...@ettus.com; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on
USRP2
Ian,
When you said &
Hi Matt
Are you able to also comment on the problem that I am having? (Summary
below):
- 1 of our 2 XCVR2450s works with both of our USRP2s.
- The other XCVR2450 works with only one of our USRP2s (i.e., it fails
to lock over the full high band and low band on the second USRP2).
Thanks
Ian.
_
Ian,
When you said "it fails to lock over the full high band and low band" do
you mean it locks nowhere, or do you mean that it locks on some
frequencies, but not everywhere? If the latter, can you be more
specific about where it locks and where it doesn't?
Also, what are the serial number
an Holland
*Cc:* j...@ettus.com <mailto:j...@ettus.com>;
discuss-gnuradio@gnu.org <mailto:discuss-gnuradio@gnu.org>
*Subject:* Re: [Discuss-gnuradio] Unable to tune Tx or Rx with
XCVR2450 on USRP2
Hi,
The problem I guess is with the SD cards only. Even I was facing
Hi Josh
I am now in a position to summarise what I have observed.
- 1 of our 2 XCVR2450s works with both of our USRP2s.
- The other XCVR2450 works with only one of our USRP2s (i.e., it fails
to lock over the full high band and low band on the second USRP2).
Do you have any idea what might be w
Ian-
> Perhaps? We only have two USRP2s and 2 XCVR2450s. However,
> if it was the SD card, I would think both XCVR2450s should
> have the problem. Actually, even the better of the two
> occasionally fails, so I can't be sure.
If you rule out the SD card, then is there a way you and Manav can comp
Hi again Josh
Since my below post this morning, the 2nd XCVR2450 card that had
repeatedly failed this morning, is now working with the other USRP2,
though still unable to tune reliably near band edges.
I will probably try swapping the XCVR2450/USRP2 combination and see
whether somehow one XCVR245
Perhaps? We only have two USRP2s and 2 XCVR2450s. However, if it was the SD
card, I would think both XCVR2450s should have the problem. Actually, even the
better of the two occasionally fails, so I can't be sure.
>Ya, what I mean is that for you too the problem may be the SD card only.
>>Actua
nt store, and they are quite cheap.
>
>
>
> Ian.
>
>
>
>
> --
>
> *From:* Manav Seth [mailto:smartyma...@gmail.com]
> *Sent:* Wednesday, 3 February 2010 10:54 AM
> *To:* Ian Holland
> *Cc:* j...@ettus.com; discuss-gnuradio@gnu.org
>
> *Subject:* Re: [Discuss-gnur
l.com]
Sent: Wednesday, 3 February 2010 10:54 AM
To: Ian Holland
Cc: j...@ettus.com; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on
USRP2
Hi,
The problem I guess is with the SD cards only. Even I was facing the
same problem. But today I tried
Hi,
The problem I guess is with the SD cards only. Even I was facing the same
problem. But today I tried with an old SD card and it worked.
I am not able to catch hold of a card reader and the one in my laptop is not
working.
manav
On Tue, Feb 2, 2010 at 5:14 PM, Ian Holland wrote:
> Hi Josh
>
Hi Josh
Thanks for the advice. I tried the full range of low and high band
frequencies, in increments of 10 MHz with 2 different XCVR2450 boards.
This was done at least 4 times after power cycling for each card. I
noticed the following:
- For one of the XCVR cards, it repeatedly failed for all fr
Is it failing to lock at all different frequencies? and in the high band
and low band ranges? Do you have more than one XCVR board with this problem?
It could be possible that for this board, and the frequencies you have
chosen, the N divider value teeters on the border or locking/not
locking.
Thanks Josh
I can now confirm that it is definitely failing to lock. I have noticed
on some rare occasions that it actually does lock. However, as soon as
the USRP2 is power-cycled it goes back to the default behaviour of being
unable to lock.
What can be done to make sure that it will lock? Is t
Ian.
From: Manav Seth [mailto:smartyma...@gmail.com]
Sent: Friday, 29 January 2010 6:11 PM
To: Ian Holland
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on
USRP2
Hey Ian,
How did the problem get fixed? I mean what frequenc
> the
> > SD cards at this time, or do you have any other idea why I can't seem
> to
> > tune frequencies on these cards?
> >
> > Thanks
> >
> > Ian.
> >
> > -Original Message-
> > From: Matt Ettus [mailto:m...@ettus.com]
> >
It could be failing to lock. You may want to watch the debug port on the
usrp2. If the lock detect is failing, it will print out on the serial
console. attach a 3.3v level serial port
On 01/28/2010 10:09 PM, Ian Holland wrote:
Hi Josh
The xcvr has a high band and a low band, which means ther
Hi Josh
>The xcvr has a high band and a low band, which means there is a gap in
>the tunable frequency range for the xcvr. Therefore, the
>"auto-calculated mid-point frequency" is an invalid frequency for the
>xcvr. Pick a frequency in the high band or low band range:
>#define LB_FREQ_MIN U2_D
2:35 PM
To: Manav Seth
Cc: Ian Holland; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450
on
USRP2
The -f argument to usrp2_fft.py is the frequency. By putting "-f
1000"
you are telling the system to try to tune the xcvr2450 to 1 kHz. The
s
frequencies on these cards?
>
> Thanks
>
> Ian.
>
> -Original Message-
> From: Matt Ettus [mailto:m...@ettus.com]
> Sent: Friday, 29 January 2010 12:35 PM
> To: Manav Seth
> Cc: Ian Holland; discuss-gnuradio@gnu.org
> Subject: Re: [Discuss-gnuradio] Unable to t
s.com]
Sent: Friday, 29 January 2010 12:35 PM
To: Manav Seth
Cc: Ian Holland; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on
USRP2
The -f argument to usrp2_fft.py is the frequency. By putting "-f 1000"
you are telling the system to
s.com]
Sent: Friday, 29 January 2010 12:35 PM
To: Manav Seth
Cc: Ian Holland; discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Unable to tune Tx or Rx with XCVR2450 on
USRP2
The -f argument to usrp2_fft.py is the frequency. By putting "-f 1000"
you are telling the system to
ut << "Baseband Frequency: " <<
>>TxTuneResult.baseband_freq << "\n";
>> cout << "DxC Frequency: " <<
>> TxTuneResult.dxc_freq << "\n";
>> cou
quency: " <<
TxTuneResult.residual_freq << "\n";
cout << "Spectrum Inverted: " <<
(TxTuneResult.spectrum_inverted ? "true" : "false") << "\n";
}
co
req << "\n";
> cout << "DxC Frequency: " <<
> TxTuneResult.dxc_freq << "\n";
> cout << "Residual Frequency: " <<
> TxTuneResult.residual_freq << "\n";
>
cout << "Residual Frequency: " <<
TxTuneResult.residual_freq << "\n";
cout << " Spectrum Inverted: " <<
(TxTuneResult.spectrum_inverted ? "true" : "false") << "\n";
Ya, its failing for me too...set_tx_center_freq is always failing (though I
am writing my code in python)..
not able to find the cause...
On Wed, Jan 27, 2010 at 8:52 PM, Ian Holland wrote:
> Hi All
>
>
>
> I have been trying to set the Tx and Rx frequencies when using an XCVR2450
> with a USRP2
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