To access the single-use boot menu on an HP ProDesk 600 Mini with an Intel i7-6700
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To access the single-use boot menu on an HP ProDesk 600 Mini with an Intel i7-6700, follow these steps: 🔧 Steps to Enter Boot Menu for USB Boot: ⚠️ Notes:
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Effect of oxidation on electrical conductivity of copper tape used on antennae
Copper tape that has oxidized to form copper oxide is much less electrically conductive than pure metallic copper — in fact, copper(I) oxide (Cu₂O) and copper(II) oxide (CuO) are both…
Reducing noise in radio telescope systems
Original PowerPoint downloadable from link below. One thing I missed in it was to say that all monitor screens near telescope or aerial should be switched off and linear power…
Separation M81 and M82 galaxies
The galaxies M81 (Bode’s Galaxy) and M82 (the Cigar Galaxy) are very close together in astronomical terms. Here’s how close: 🔭 Angular Separation (as seen from Earth): 📏 Physical (Spatial)…
Alex Pettit’s evaluation of October 2024 data set from my Ptarmigan Array radio telescope compared to two other radio telescope systems 6/1/2025
Shows very low power levels on my system compared to the two comparators. Andy
Importance of placement of LNA (Low Noise Amplifier) close to dish and not close to receiver
From: ‘Alex P’ via Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Sent: 04 January 2025 10:28To: Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Subject: Re: Adapter attenuation ~ 0.15 dB / adapter Please ‘Review’…
Attenuation of signal due to radio connector adapters
From: ‘Alex P’ via Society of Amateur Radio AstronomersSent: 04 January 2025 10:28To: Society of Amateur Radio AstronomersSubject: Re: Adapter attenuation ~ 0.15 dB / adapter
Notes on attenuation from responses to questions asked on SARA Mailing List 5 January 2025
My Question: Hi, Basic question- say I save 2dB here by changing coax and 2dB there by doing something else. Does that mean the total saving is 2+2=4dB or, as…