Re: [Discuss-gnuradio] Pulsar detection success

[Lamar Owen]

On Monday 25 September 2006 00:45, Marcus Leech wrote:
> I got word from Lamar Owen this evening that PARI were successful in
> using my gnuradio-based pulsar monitor
>   software along with the excellent USRP + TV_RX hardware to detect and
> monitor the pulsar B0950+08, which
>   has a pulse rate of 3.95Hz. I can't be sure from the trace, but I
> *think* they detected the much-weaker inter-pulse
>   as well.

I'll post some captures of the screen.. hmm, if the list will take 
attachments, here are the clearest traces.... All are of B0950+08, one of the 
brightest pulsars in the sky, and one with a low dispersion measure.

The receive antenna was PARI's East 26 meter radio telescope (see the PARI 
website for pictures and such) with a cross-dipole-in-a-bucket standard feed 
at the prime focus, centered on 327MHz.  The coax run from the dipole to the 
first LNA is about three feet; the first LNA is an Angle Linear unit, driving 
a second broadband Minicircuits amp.  This drives the 400+ foot RG214 cable 
run down to the control room, where it is a straight patch through a 
lightning arrestor panel to the TVRX input.

PC is a Dell PowerEdge 2850 dual Xeon 3.0GHz; CPU utilization at 2MHz 
bandwidth is around 60% of one CPU.

Time to go to bed...
-- 
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC  28772
(828)862-5554
www.pari.edu

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