Formula for Tsys calculation
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Tsys = Trx + Tant Where: Tsys = total system noise temperatureTrx = receiver noise temperatureTant = antenna temperature (everything seen by the antenna) Expanded form: Tsys = Trx +…
Radio Astronomy
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…
How does the TV1 Minicaster device compare to Yaesu G-5500DC for my desired purpose of pointing at and tracking masers?
CHATGPT OPINION: For tracking astronomical masers (or any fixed celestial radio source that drifts slowly across the sky), I would actually lean toward the TV1 miniCASTER positioner rather than a…
I have a TV1 miniCASTER vehicle-mounted satellite uplink positioner system. It is designed to go on top of a minivan, has azimuth bearing around 50cm in diameter, and an altitude motor which attaches to an arm which holds the dish and can fold down automatically for storage when not in use. Would this suit my intended purpose to use it to point at and track masers?
Your description matches the TV1 miniCASTER vehicle-mounted satellite uplink positioner much more closely than a conventional antenna rotator. From the material I found, the system was mounted on broadcast vans…
My SETI Horn of Plenty uses a WR-650 rectangular waveguide. What difference would it make to taper the waveguide down to a point rather than flat back to the waveguide?
If by “taper the waveguide down to a point” you mean replacing the flat shorted end behind the probe/feed with a pyramidal or conical taper that gradually narrows to a…
Can I use the Yaesu G-5500DC antenna rotator to point a dish at a specific object in the night sky and track it? Could this be used to detect and follow masers?
ADVICE FROM CHATGPT (NO PROMISES MADE ABOUT HOW EFFECTIVE THIS ADVICE IS): Best value source for Yaesu G-5500DC antenna rotator and computer controller in the UK: If your goal is…
My SETI Horn of Plenty use a WR-650 waveguide. What difference would it make to taper the waveguide down to a point rather than flat back to the waveguide?
If by “taper the waveguide down to a point” you mean replacing the flat shorted end behind the probe/feed with a pyramidal or conical taper that gradually narrows to a…
Adding framework to LRO-H2 Solar Cooker 150cm rolled steel dish
This framework is designed to support an aluminium window netting to reduce ground noise. However, as soon as I added the wood to this an immediate potential issue arose –…