LNBs available for masers which can be observed with 1m dish
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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:…
2026
Where to putxhase Norsat 9000LD LNB needed for 22GHz maser observations
The Norsat 9000LD series is a professional Ka-band DRO LNB used for satellite communications rather than consumer satellite TV. Norsat still lists the 9000L series as a current product. I…
How do I add 3 logarithmic numbers together?
To add three logarithms with the same base: log(a) + log(b) + log(c) = log(abc) Example: log10(2) + log10(3) + log10(5) = log10(2 * 3 * 5) = log10(30) If…
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…
Which battery should I use for the Parkside 12V cordless polisher/sander that I am using to make radio telescope mounts at LRO?
For the Parkside 12V cordless polisher/sander (the 75 mm model), there is little practical difference between using a PAPK 12 A3 and a PAPK 12 A4 battery. Both are 12…
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…