Cheap signal generators
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These are readily available covering wide range of frequencies. The one below is presented as an example only.
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Hypernovae
Astronomers have detected events that we classify as “hypernovae.” The word hypernova isn’t an official supernova classification but is widely used to describe the most energetic stellar explosions, usually linked…
RTL-SDR Blog V3 dongle is based on the R820T2 tuner chip
The RTL-SDR Blog V3 dongle is based on the R820T2 tuner chip. Its useful bandwidth is limited by the USB 2.0 bus and the RTL2832U demodulator chip. You can push…
Jason Burnfield’s Design Calculator for Offset 3m Radio Astronomy Dish
Jason has set himself the challenge of designing and building such a dish – first step is design and he has created an Excel Spreadsheet calculator for this purpose –…
Design of offset satellite dish – is it half a parabola?
An offset satellite dish is not literally “half a parabola,” though it is related to a parabola. Here’s the distinction: So, instead of being “half a parabola,” an offset dish…
Museum of Liverpool building acts like a guitar sounding box reflecting sound as if a large were installed in it.
There is no speaker on this building! Physics in action https://www.astronomy.me.uk/wp-admin/upload.php?item=14185 https://www.astronomy.me.uk/wp-admin/upload.php?item=14186
How to move calender from one account to another, when both are Microsoft Outlook accounts.
You can move or copy a calendar between two Outlook accounts, but the method depends on whether you’re using desktop Outlook (Windows/Mac) or Outlook on the Web. Here are the…
How to add a Trusted File in McAfee to prevent the antivirus software quarantining it
Here’s how to add a trusted file (i.e., exclude it from scans) in McAfee — the options vary slightly depending on the version you’re using: Adding a Trusted File to…
Magnetometer sensitivity to vibrations & orientation.
I am currently testing my magnetometer. It is on the same table where my laptop sits and the following screenshot shows just how sensitive magnetometers are to vibrations amd slight…
If the computer shows “connected to network” but ping fails.
If the computer shows “connected to network” but ping fails, that usually means the link is established but something is wrong further up the chain. Here’s a step-by-step way to…