Hi Dave, I am also part of an astronomical observatory, Tavolaia astronomical observatory. http://www.cielisutavolaia.com/ Recently we have built a B0329 + 54 pulsar reception system, the data is publ

#21cm #1420mhz #radioastronomy

I would love to see the Astrospy program have a feature to periodically log data to a file with a a timestamp. It would be such an obvious feature to add. Dan

#21cm #1420mhz #radioastronomy

I have the Airspy Mini and I have built a horn antenna, I'm using 2 LNA4ALLs and a 1420-1470 MHz bandpass filter in between them. I think I have picked up the hydrogen emission signal. I would like to

#1420mhz #21cm #radioastronomy

1) What is the aperture of your horn? 2) How much gain do you have after the two LNA4ALL preamps? 3) What is the loss of your BPF for 1420? 4) What is you detection bandwidth? 5) What is the loss of y

#1420mhz #21cm #radioastronomy

That hump is likely the hydrogen line signal. What size is your horn antenna? NRAO has a fairly full collection of tutorials on basic radio astronomy, including discussions of integration time. Also,

#1420mhz #21cm #radioastronomy

I'm very confused by your bandwidth comments here. I don't know much about SDR#, but if it shows a couple of MHz around the notional line frequency of 1420.40575MHz, and allows deep integration, then

#1420mhz #21cm #radioastronomy

I tried receiving the hydrogen line in the direction of M31 but I can't solve the signal, evidently the s / n ratio is still low. The first image in the frequency domain, the second in the speed domai

#1420mhz #21cm #radioastronomy

You are definitely receiving Hydrogen line emissions from within this galaxy. Since M31 is moving relative to us I would think you would need to look about 3 MHz higher or lower to see Hydrogen line e

#1420mhz #21cm #radioastronomy

Yes, the visible signal is certainly generated by interstellar material belonging to our galaxy.

#1420mhz #21cm #radioastronomy

That signal will be somewhere around 1422.5MHz--right off the edge of your chart.

#1420mhz #21cm #radioastronomy

The aggregate M31 signature is at a redshift of roughly -500km/sec, or centered at about 1422.77MHz -- which is off your chart.

#1420mhz #21cm #radioastronomy