Protected: Talk for Walsall Astronomy Club on Proposed Radio Astronomy Projects for Club 13/11/2025
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Radio Astronomy
Can you recommend calibration noise sources and how would I use these with block diagrams?
Can you recommend calibration noise sources and how would I use these with block diagrams? Nice — below I’ll give: 1) Which noise source to get (practical options) Quick buying…
I would like to buy a 50 ohm terminal load to produce reference samples for 1420 MHz radio astronomy. Am I better off buying one designed for high wattage transmission than cheap small receive-only version?
I would like to buy a 50 ohm terminal load to produce reference samples for 1420 MHz radio astronomy. Am I better off buying one designed for high wattage transmission…
What alternatives are there available to Nooelec SAWBird H1 with inbuilt resistor to use to generate reference samples for hydrogen line work?
Short answer: yes — but almost never as a single consumer LNA product.Two common approaches are used in practice: Details, tradeoffs and concrete parts: Why you don’t usually see “LNA…
Am I right to be concerned that Tohtsu CX-520D will degrade the signal too much when added in front of LNA on 1420 MHz radio telescope?
In discussions with members of SARA, some of them have discussed that my mechanical Tohtsu CX-520D will degrade the signal too much, if I use it in front of the…
How much loss does Tohtsu CX-520D coaxial relay add to 1420 MHZ radio telescope?
Short answer first: yes — the CX-520D does add only a very small insertion loss (~0.2 dB) at L-band, so if the LNA is mounted at the antenna (mast/head) the…
Comparing (i) masthead LNA with coaxial switch for reference samples, (ii) Nooelec SAWBird H1 LNA with inbuilt 50 ohm switched reference resistor, (iii) 8M bandwidth signal using part away from hydrogen line as reference.
Comparing LNA at masthead with coaxial switch in front of it, with Nooelec SAWBird H1 LNA with inbuilt 50 ohm resistor which can be switched in and out for generation…
British Astronomical Association Radio Astronomy Group H-Line Sub-Group Meeting Recordings
There is now a new playlist, to make it easier to access these recordings: https://www.youtube.com/playlist?list=PLzBTybazXT4123hs3KiBO28PeMTzc6Cks
List of meteor showers
Here’s a practical “all the ones that matter” list, with 2025 peak nights and typical peak rates (ZHR under dark, clear skies). For the exhaustive working list (including many minor/variable…
Solid state coaxial relay
Or….Options in the “RF switching without the clacky bits”! A solid-state coaxial relay is basically an RF switch that uses PIN diodes or GaAs FETs instead of a mechanical armature.…