What is Kalman filter for radio dish feedback?
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A Kalman filter is a mathematical method used to estimate the true position and motion of a system when the measurements are noisy. For a radio dish, it can make…
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Comparing the Airspy Mini SDR with the RTL-SDR and equivalents for hydrogen line radio astronomy
The Airspy Mini has a maximum IQ sample rate of 6 MSPS, giving a maximum instantaneous bandwidth of approximately 6 MHz. However, there are a few subtleties: Available sample rates:…
Is there any 100wh power bank with excellent reviews?
Yes — there are a few very well-reviewed ~100Wh (airline-safe) power banks, but they are almost all from established brands (Anker, Nitecore, Ugreen). The key point is: anything near 100Wh…
What are the specifications of the Lidl Ultimate UPK 10 H5 power bank? In particular, what is its mAh rating, mWh rating, and what current can it produce at 5V and 12V?
The Lidl Ultimate Speed UPK 10 H5 (also sold as a jump starter / power bank / compressor unit) has fairly well-documented specs. Here are the key values you asked…
How do I convert power bank’s mAh rating into mWh?
To convert a power bank from mAh to mWh, you need to know the voltage (V) of the battery. Key formula mWh = mAh × V Why this works mAh…
I have a Sony a7 camera. Apparently I can send photos to my phone. How do I do this?
You can transfer photos from your Sony A7 to your phone using Sony’s app. The exact steps depend on which A7 model you have, but the general process is similar.…
How to calculate dB above background from ezCol plots:
THIS METHOD PRODUCES AN APPROXIMATE MEASURMENT WHICH GIVES OBSERVERS AN IDEA OF THE PERFORMANCE OF THEIR RADIO TELESCOPES AND SHOULD NOT HE TAKEN AS AN ACCURATE SCIENTIFIC CALIBRATED ASSESSMENT, WHICH…
When and for what is it important to have a good quality clock on your SDR for amateur radio astronomy?
Most natural sources are broadband, so unless you are doing inerferometry, for total power radiometry, clock quality is not important, anything will do. For hydrogen line and similar work, a…
Has anyone designed dishes where the the surface is not parabolic but instead a complicated curve?
Yes. In fact, some of the most advanced radio and optical systems deliberately use surfaces that are not simple parabolas. Some examples: 1. Spherical reflectors A sphere is easier to…
Design for a folding 3m radio dish for hydrogen work
(As yet unbuilt. I am encouraged by Jason Burnfield’s folding 3m dish currently under construction. I do not have room for permanent mounting of a dish of this size but…