Pulsar Observations - Nando Pelligrini (I1NDP) &  Ferruccio Paglia (IW1DTU)

NOTE: All images presented here and a large part of the text has been downloaded with permission from this website.

Nando Pelligrini (I1NDP) and Ferruccio Paglia (IW1DTU) have detected B0329+54 using a 10 metre dish @ 1296 MHz.

Background (extracted from the website)

23cm Pulsar Observation

The decision was to try on 23cm which is a much quieter frequency using my 10 metre dish, on 23cm the weaker pulsar can (hardly) be compensated by the higher antenna gain and actually the attempt we made with the same setup as on 70cm (SDR 14 + Hardware trigger) and about 2 hours of observation have also been disappointing. No sign of the pulsar. The only chance of increasing our sensitivity was to enlarge the bandwidth window but the SDR14 is not able to go beyond the 250 KHz limit.

I own a Perseus SDR with a typical mission as an excellent HF receiver but no provision as radioastronomical tool but it is capable of producing a 2 MHz wide spectrum recording as a .wav file. The chance was to try with an off line data integration produced by the Perseus using an ad hoc home made software.

The receiving chain was then composed by 10 metre dish + 0.27 dB NF, 37 dB gain LNA + transverter + Perseus at 28 MHz IF, the feeder was a septum dual mode with circular polarization.

The software was composed by a processing task reading the .wav file and integrating all of the recorded samples in a memory table and a raw graphic object to show the final result. Input to the processing was the pulsar frequency calculated by the TEMPO utility for current frequency, location and time. Next essential information was the sample rate use by the receiver and it was taken from the .wav header information.

Antenna

The 10 metre dish antenna used by I1NDP and IW1DTU to observe pulsars at 23cm.

 

The Results (2014)

The results of detection of B0329+54 (~ 3300 ly) as given by I1NDP and IW1DTU.


B0329+54



Other Details

There is much more detail on I1NDP's website here. A visit to the website will show the trials, setbacks - but ultimate success of this attempt to detect a pulsar.