Failed attempts to upload revised firmware onto Cosmic Watch v2 muon detector
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I have accessed Jotham Gates Githib site – how do I now load his firmware onto my Cosmic Watch v2 muon detector? Good — if you’ve already reached Jotham Gates’…
Radio Astronomy
What lowest noise level in temperature an amateur radio astronomer at 1420 MHz achieve?
At 1420 MHz (the hydrogen line), the lowest system noise temperature an amateur can realistically achieve depends on the quality of the antenna, feed, low-noise amplifier (LNA), and how much…
What is beamwidth of 1.2m prime focus satellite dish with typical F/D ratio?
For a 1.2 m prime-focus parabolic dish, the beamwidth depends mainly on the operating frequency (or wavelength), not strongly on the F/D ratio. A typical prime-focus dish has an F/D…
LNBs available for masers which can be observed with 1m dish
With a 1 m dish, observing astronomical masers is challenging but not impossible if you use a low-noise receiver and target the strongest sources. The most practical maser lines are:…
Why do radio astronomers use temperature rather than dB or another measurement to measure noise?
Radio astronomers use temperature because the random electrical noise generated by a resistor is directly proportional to its physical temperature. This creates a natural link between thermal physics and radio…
What is difference between receiver temperature, spillover temperature, ambient temperature, background temperature in radio telescopes?
In radio astronomy, several different “temperatures” are used to describe sources of noise. They are all expressed in Kelvin (K) because radio noise power is conveniently represented as an equivalent…
Formula for Tsys calculation
Tsys = Trx + Tant Where: Tsys = total system noise temperatureTrx = receiver noise temperatureTant = antenna temperature (everything seen by the antenna) Expanded form: Tsys = Trx +…
Where would you point a hydrogen line radio telescope to get hot sky?
Calibration of radio telescopes usually uses cold sky and hot ground, rather than hot sky. However, for completeness here is hot sky. (Cold sky is best achieved by pointing at…
What SDRs will provide bandwidth 20 MHz suitable for millimeter work?
If you want a receiver with 20 MHz instantaneous bandwidth, there are only a few realistic options — and one stands out as the simplest choice. — Best simple answer…
I need to brace my satellite dish as it is flexing when moves. What materials are effectively transparent to radio waves at 21cm, with least absorption or defraction and least weight with minimal cost?
At the hydrogen line (21 cm wavelength, 1420 MHz), many common structural materials are essentially transparent provided they are non-conductive and not loaded with carbon or metal. For bracing a…