The Solar dish at Sherwood Observatory in Sutton-in-Ashfield
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Yes — the Sherwood Observatory solar radio dish you mean operates at about 2.8 GHz (2800 MHz), not 12 GHz. At 2.8 GHz, the wavelength is about 10.7 cm, which…
How can muons have different energies?
Cosmic-ray muons reaching the ground have a very broad range of energies. Most atmospheric muons are produced when high-energy cosmic rays strike nuclei in the upper atmosphere, creating pions and…
Assessment of the two ex-telecommunication 5650A rubidium time standards purchased from same seller on AliExpress
Thank you for sending both the two rubidium 5650A time sources I have purchased from you. The second one is good = 340 seconds avg. and I then get a…
Why did Viking landers cost $100 million to build vs others that cost $10 million?
If by “other landers” you mean later Mars spacecraft such as Mars Pathfinder, the apparent roughly $100 million versus $10 million difference for particular components/subsystems is largely because Viking was…
KrakenRF Discovery Dish Solar Continuum and Interferometry System Validation 30 September 2026
https://www.astronomy.me.uk/wp-content/uploads/2026/09/Discovery_Dish_Solar_Continuum_and_Interferometry_System_Validation_30_Sep_2026_Paper_FINAL-sent-to-Brian-Rouke-300926@2100.pdf
Comparing second 5650A rubidium time source from AliExpress at LRO with Leo Bodnar LBE-1421 GPS-disciplined time source 30/9/2026
I now have 2nd one of these – video comparing it to Leo Bodnar 1421 GPS disciplined time source can be downloaded at: https://files.ad.thornett.net/astronet/Testing2ndRubidium5650A300926@1228-edited.mp4 Quite big file – 8 GB…
What frequency range is covered by SDRPlay 2 and RSPDuo software defined radios? Can they be used for VLF radio astronomy?
SDRplay RSP2: It goes remarkably low: For your VLF work, the important part is the High-Z input. It has a nominal 1 kΩ balanced input and a 30 MHz low-pass…
Capacitance and impedance matching on loop antennas in VLF radio astronomy
With a VLF receiving loop, you usually do not need conventional 50-ohm impedance matching. At VLF (say 10-30 kHz), your loop is electrically tiny. Its impedance is dominated by the…
Modulation of large lower VLF transmitters used for submarine communication (the same VLF signals used for SID detection by amateur radio astronomers)
Large high-power VLF transmitters used for submarine communication (typically about 15-30 kHz) generally transmit digital information by deliberately changing the phase and/or frequency of the carrier. Straight amplitude modulation is…
How to test FE-5650A rubidium time standard against Leo Bodnar GPSDO
TESTING THE FE-5650A RUBIDIUM STANDARD AGAINST A LEO BODNAR GPSDO The simplest useful test is to compare the FE-5650A 10 MHz output directly with the Leo Bodnar GPSDO, also set…