astronomy.me.uk The Website of Lichfield Radio Astronomy Observatory (LRO) – Page 4 – Astronomy observatory in Staffordshire, England.

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

Can an existing SETI Horn of Plenty (Hydrogen Line Horn) be extended by adding an extension on the front? Practical answer and more detailed explanation of physics involved.

Admin May 26, 2026 No Comments

On Monday, May 25, 2026 at 1:09:30 AM UTC-7 Andrew Thornett wrote: Can a horn be made larger simply by adding an extension to end of same flare angle, or does…

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

Am I getting reasonable performance from my SETI Horn of Plenty at LRO (Hydrogen Line)?

Admin May 26, 2026 No Comments

Answer by Jason Burnfield: On Tue, May 26, 2026 at 1:33 AM Andrew Thornett wrote: Can I ask you for your back of envelope dB calculation on the trace from my…

Easy Radio Astronomy Software (ezRA)

How would I convert the plots on ezCon from ezRA (Easy Radio Astronomy Software written by Ted Cline) into dB?

Admin May 26, 2026 No Comments

In ezRA’s ezCon, the plotted values are usually displayed in the raw linear units from the processed data files. If you want to express them in decibels (dB), the conversion…

Building radio telescopes

Friend said he used vacuum cleaner to blow string through plastic conduit 50m so he could then pull CAT5 cable though. Does that work?

Admin May 25, 2026 No Comments

Yes, that can work, and it’s a fairly common trick for long conduit runs. The usual method is: For a 50 m conduit, suction is often more effective than trying…

VLF Radio Detection of SIDs (Very low Frequency detection of Sudden Ionospheric Disturbances)

What balanced amplifiers could be used on a VLF loop antenna?

Admin May 25, 2026 No Comments

For a VLF loop antenna (typically covering a few kHz up to perhaps 30–300 kHz), a balanced amplifier should ideally have: Several approaches work well: Instrumentation Amplifiers These are often…

Radio observation in hydrogen line (1420MHz)

RF choke designs

Admin May 25, 2026 No Comments

An RF choke is an inductor designed to present a high impedance to radio-frequency currents while allowing DC or low-frequency currents to pass. The best design depends on the frequency…

VLF Radio Detection of SIDs (Very low Frequency detection of Sudden Ionospheric Disturbances)

HP10509A Circular Loop Antenna.

Admin May 25, 2026 No Comments

The HP 10509A Circular Loop Antenna is a specialized active magnetic-loop receiving antenna developed by Hewlett-Packard in the early 1960s. It was originally supplied with the HP 117A VLF Comparator…

Radio observation in hydrogen line (1420MHz)

What is a balanced feed line in radio astronomy?

Admin May 25, 2026 No Comments

A balanced feed line is a transmission line in which the two conductors carry equal currents in opposite directions, and neither conductor is connected to ground. The electromagnetic fields are…

VLF Radio Detection of SIDs (Very low Frequency detection of Sudden Ionospheric Disturbances)

Link for VLF meeting tonight

Admin May 25, 2026 No Comments

https://us06web.zoom.us/j/83880385896?pwd=RaJleLpl3wWahgD8q8JCFMbaybeg5N.1

Radio observation in hydrogen line (1420MHz) SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)

What size oil tin about right to make WR650 waveguide for hydrogen line detection using a SETI Horn of Plenty?

Admin May 25, 2026 No Comments

For a WR-650 waveguide at the 1420 MHz hydrogen line, the internal dimensions need to be about 165 mm × 82.5 mm (6.5″ × 3.25″). That means you’re looking for…

Can an existing SETI Horn of Plenty (Hydrogen Line Horn) be extended by adding an extension on the front? Practical answer and more detailed explanation of physics involved.

Am I getting reasonable performance from my SETI Horn of Plenty at LRO (Hydrogen Line)?

How would I convert the plots on ezCon from ezRA (Easy Radio Astronomy Software written by Ted Cline) into dB?

Friend said he used vacuum cleaner to blow string through plastic conduit 50m so he could then pull CAT5 cable though. Does that work?

What balanced amplifiers could be used on a VLF loop antenna?

RF choke designs

HP10509A Circular Loop Antenna.

What is a balanced feed line in radio astronomy?

Link for VLF meeting tonight

What size oil tin about right to make WR650 waveguide for hydrogen line detection using a SETI Horn of Plenty?

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The Bob Stricklin hydrogen line signal generator for testing hydrogen line radio telescopes

Performance of 150mm x 50mm aluminium box section as waveguide for hydrogen (homemade WR650) vs rectangular oil tin

Factoids about radio telescopes vs optical telescopes

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