Re: [Discuss-gnuradio] Ubunto and GnuRadio, Lovely together

[Daniel O'Connor]

On Monday 06 March 2006 08:14, Robert McGwier wrote:
> Yes Matt, I know.  I do love to install.   Now if Altera would only
> release their tools for Linux.

They have, but they cost money :)

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C


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[Discuss-gnuradio] Ubunto and GnuRadio, Lovely together

[Robert McGwier]

I am running gr on my new Ubunto installation on my Mini-ITX   'SDR 
machine'. Not one single build of a library was required.  For those 
that do not know about it,  Ubunto is a Debian derivative.  It's package 
tool is apt and synaptic.  This was completely trivial outside of one 
"wrapped around the axle" race condition I put synaptic in that 
eventually required me to manually delete the package from the cache and 
force unmark all selections.  (python-sip4-qt was the offending package, 
just say no).


Frank and I are standardizing our development for gr and DttSP on this 
distro.  It was the most delightful time I've had to date installing and 
running.


Yes Matt, I know.  I do love to install.   Now if Altera would only 
release their tools for Linux.


Bob

--
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity.  Guilty as charged!



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[Discuss-gnuradio] Need help installing GNU Radio

[jjw]

Hello all,

I am trying to install GNURadio on a Fedora Core 4 system following the
instructions at http://www.kd7lmo.net/ground_gnuradio_install.html.  I
completed the baseline install process (skipping the two octave installs
because I don't need them) and proceeded onto the gnu radio portion of the
install.  When I go to install gnuradio-core I get an error duirng the make
check (error below).  I tried removing the enable-sse command from my FFTW
install per http://www.nd.edu/~dshen/GNU/Tutorial/1.html this site's
instructions for installing GNU radio but have not had any success.
If anybody has any idea what could be causing this and how to get past it, I
would really appreciate it.  Thanks for all the help!



OK
>>> gr_fir_fff: using SSE
../run_tests: line 15: 13414 Segmentation fault  $file

--
Ran 4 tests in 0.020s

OK
...
--
Ran 3 tests in 0.015s

OK
...
--
Ran 3 tests in 0.018s

OK
FAIL: run_tests
===
1 of 1 tests failed
===
make[5]: *** [check-TESTS] Error 1
make[5]: Leaving directory
`/home/jjw27370/Desktop/gnuradio/gnuradio-core/src/python/gnuradio/gr'
make[4]: *** [check-am] Error 2
make[4]: Leaving directory
`/home/jjw27370/Desktop/gnuradio/gnuradio-core/src/python/gnuradio/gr'
make[3]: *** [check-recursive] Error 1
make[3]: Leaving directory
`/home/jjw27370/Desktop/gnuradio/gnuradio-core/src/python/gnuradio'
make[2]: *** [check-recursive] Error 1
make[2]: Leaving directory
`/home/jjw27370/Desktop/gnuradio/gnuradio-core/src/python'
make[1]: *** [check-recursive] Error 1
make[1]: Leaving directory
`/home/jjw27370/Desktop/gnuradio/gnuradio-core/src'
make: *** [check-recursive] Error 1 
--
View this message in context: 
http://www.nabble.com/Need-help-installing-GNU-Radio-t1234009.html#a3264114
Sent from the GnuRadio forum at Nabble.com.



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[Discuss-gnuradio] Re: USRP Update -- Daughterboard News March 2006!

[Matt Ettus]

> Why would somebody buy an LFRX or LFTX instead of a BasicRX or
> BasicTX? Do they have an extra gain stage or other feature?


Reasons you would want the LF boards:
- The Basic boards don't work below about 1 MHz, and you have signals
down to DC.  One use would be for LF and VLF radio.  Also, if you have
an external RF section which uses direct conversion, you need the LF boards.

- The LF boards have some of their own antialias filtering.

- The LFTX will put out more power than the BasicTX.

Reason you would want the Basic boards:
- You need to deal with signals over 30 MHz.


Matt


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Re: [Discuss-gnuradio] frequency tuning word quantization

[Eric Blossom]

On Sun, Mar 05, 2006 at 07:18:40PM -0500, David I. Emery wrote:
> On Sun, Mar 05, 2006 at 12:03:33PM -0800, Eric Blossom wrote:
> > Good question.  I've wanted to revisit it myself too.
> > As I recall it was to reduce the spurs in the DDC output.
> > If you get a chance, please see if you can find relevant papers.
> > I suggest searching for "DDS spurs", or something like that.
> > 
> > In looking at the DDS's from Analog Devices, etc., they maintain a
> > full precision frequency tuning word and phase accumulator, and then
> > use only the high part to feed into the sin/cos generator.  We also
> > do that in the FPGA.  The question is whether we should be doing the
> > coarse quanitization of the frequency tuning word the way we are, or
> > some other way, or not at all.

>   As for spurs resulting from this - I would have to do a
> literature check.   But the mechanism for generating them is not
> obvious.
> 
> 
> > 
> > Anybody else got something to contribute to this discussion?
> 
>   The above is my attempt...

Thanks Dave!

Googling "phase truncation spurs" turns up several good papers.

The truncation from the full accumulator width to whatever width the
sin/cos generation really supports eventually results in slight "phase
truncation spurs" -- effectively phase modulation.

The EDN article by David Brandon (Analog Devices) 
 says that the
worst-case spurious magnitude attributable to phase-word width is
-6.02 * P dBc, where P is the number of bits in the phase word.
(The magnitude is proportional to the LSB weight in the phase word.)

In the FPGA, the phase word (not the accumulator) is approximately
15-bits wide.  This gives worst case phase-truncation spurs of -90 dBc.
This looks small enough that we can safely ignore it. Therefore, 
I suggest we stop truncating the tuning word on the host side.

Also, if we stop truncating on the host, then our frequency tuning
resolution will be 64e6 / 2**31 = 0.03 Hz.  Probably fine enough for
most uses.

Matt, do you concur?

Eric


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Re: [Discuss-gnuradio] frequency tuning word quantization

[David I. Emery]

On Sun, Mar 05, 2006 at 05:53:44PM -0800, Eric Blossom wrote:
> 
> In the FPGA, the phase word (not the accumulator) is approximately
> 15-bits wide.  This gives worst case phase-truncation spurs of -90 dBc.
> This looks small enough that we can safely ignore it. Therefore, 
> I suggest we stop truncating the tuning word on the host side.
> 
> Also, if we stop truncating on the host, then our frequency tuning
> resolution will be 64e6 / 2**31 = 0.03 Hz.  Probably fine enough for
> most uses.

I'd certainly suggest that if you decide NOT to support this
high resolution setting as a default, you provide a method for doing
so for applications where best spurious performance is less critical
than the myriad advantages of being able to set the downconverter
right on channel rather than synthesizing that (in a bunch of cycles)
with various errors and resource consumption.


-- 
   Dave Emery N1PRE,  [EMAIL PROTECTED]  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."



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