How long does a photon take to cross 10cm space?
Admin
Sure! Here’s the calculation in plain ASCII: For reference:
Admin
What amateur deep space network groups are picking up signals from deep space probes?
There isn’t a single formal “amateur deep space network,” but there are several organised groups and communities of radio amateurs and citizen-science teams that regularly detect carriers from interplanetary probes.…
How to install Linux on Mac?
Installing Linux on a Mac depends mainly on which type of Mac you have: I’ll outline both methods. 1. Installing Linux on an Intel Mac (Most Flexible) Step 1 —…
What torque is required on drive to move 150cm dish?
The torque required depends mostly on three things: If the dish is perfectly balanced around the elevation axis, the motor only needs to overcome friction and inertia, which is quite…
Online interdigital RF cavity filter designer
Dale Hitherington’s online calculator (WA4DSY): https://www.wa4dsy.net/cgi-bin/idbpf
Alex Pettit’s new RFI removal regime in H-Line 3D
New process to clean up hydrogen line data, removing RFI. https://github.com/AP-HLine-3D/HLine3D/blob/main/JAVA_HL3D_mX%2Bb_RFI_V2.2_08Mar26_IFAvg2csv.jar start with zero frequency width and gradually widen.
Tell me what a SID (Sudden Ionospheric Disturbance) is and what range of frequencies are covered when monitoring for SIDs.
A SID stands for Sudden Ionospheric Disturbance. It refers to a rapid change in the ionosphere caused by intense solar radiation, usually from a solar flare. These disturbances are commonly…
Are there disadvantages of using SAWBird H1 vs Cavity filter?
Yes — there are several practical disadvantages of using a SAWBird H1 (or similar surface-acoustic-wave bandpass filter) compared with a cavity filter in RF front-ends, especially at VHF/UHF, narrow-channel, or…
Can I use cavity filter followed by amplifier to get better effect than SAWBird H1?
Amplifier examples relevant to discussion below of receiver chains that involve amplifier before a cavity filter: Budget amplifiers: Better quality amplifiers: Even better and more expensive amplifiers: Description: Yes —…