Define "Inexpensive"?? A BeeLink BT3 comes with W10 already installed, for example, and is available for fairly cheap on Amazon...

This is normally a concern for folks using exceedingly-narrowband modes--I would expect the default clock to be more-than-adequate for almost everything. The only thing might be if one were doing some

USB issues sounds like a killer. I run my SBCs headless mostly. Hmmmm.

#spyserver

What is it you don't like about the N2? I have a couple that I haven't done anything with yet. Have you experience with the XU4 to compare against? Just curious.

#spyserver

I should have copied this group a few weeks back when we published this, but, forgot: http://www.ccera.ca/files/memos/ccera-memo-0011.pdf This is updated regularly: http://www.ccera.ca/files/21cm.png

I run a special radio astronomy flow with an XU4 and R2 at 10Msps. But this isn’t SpyServer.

I use a pair of AirSpy R2 for our hydrogen spectrometer, and I've never seen any hint of unexpectedly-large values coming out of it, although I don't use anything close to a "raw" interface, but use g

#bestpractice #experiment

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

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

#1420mhz #21cm #radioastronomy

Oh, gotcha. OK.

I've seen references to higher sample rates, for example, here: https://discussions.flightaware.com/t/airspy-ads-b-decoder/55825 Than the 10Msps that I assumed was the highest that could be achieved.

Yes, I'm familiar with Nuvistors. Never used them, but saw them on surplus-store shelves back in the 1970s. He's probably used them. In his earlier career, he worked on radar systems at Chilbolton in

I wasn't active in electronics until 1973, and then only as a pimply kid :) But I have a very good radio astronomer friend who built his first radio astronomy receivers from tubes. He owns one of the

The galactic background noise at 100MHz varies between about 400K and about 1500K, depending on which parts of the galaxy are tickling your antenna, so even at 100MHz, having an LNA significantly belo

HF receivers have often been fielded with noise figures considerably above 10dB, so you don't have to work *that* hard to produce a front end with >10dB NF :) :) The question comes down to how importa

I like to use this table here: http://wera.cen.uni-hamburg.de/DBM.shtml To convert from voltages to dBm. The quoted sensitivity in voltage is roughly -121dBm, or divided by 10kHz gives about -161dBm/H

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

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

Je parles francais comme un cochon sauvage There's nothing wrong with your English :)

This is very encouraging. At CCERA (http://www.ccera.ca) we're planning to build a parabolic-trough antenna (or perhaps two) with multiple phased-array feeds to provide multiple beams on the sky. Plan