One upgrade that often improves hydrogen-line observations more than adding extra amplifiers or filters is improving the frequency stability of the SDR. Use a stable reference (TCXO or external clock)…
A simple improvement many hydrogen-line observers use with the Nooelec SAWbird+ H1 can noticeably improve the received SNR without adding another filter. The trick: Reduce gain at the SDR input…
Short answer: sometimes yes, but only in specific situations. In many hydrogen-line setups it gives little improvement and can even slightly reduce sensitivity. What the SAWBird H1 already does The…
An anti-aliasing filter is a filter placed before a signal is sampled by an analog-to-digital converter (ADC) to remove frequencies that are too high to be represented correctly after sampling.…
The phenomenon is called Intermodulation, specifically third-order intermodulation when two signals produce a third frequency that falls into your band. How it works When two strong RF signals at frequencies…
Test data: https://www.astronomy.me.uk/wp-content/uploads/2026/03/260306_WT-A11988-Q06_1415-1425MHz_Test-Data.docx Test Curves: Batch of three filters ordered – test curves for all three below: Filters 1-3:
Yes 👍 — WordPress runs primarily on PHP. How it works Simplified flow Typical hosting stack A common setup is the LAMP stack: There are also variants like LEMP (Linux…
https://www.astronomy.me.uk/wp-content/uploads/2026/03/LMX2820-22.6-GHz-Wideband-PLLatinum™-RF-Synthesizer-Product-Info-Sheet.pdf
On Windows, the fileinfo extension is usually already included with PHP—you normally just need to enable it in php.ini. Here is the straightforward way to do it. 1. Find your…
Click on link below to download manual: https://www.astronomy.me.uk/wp-content/uploads/2026/03/RJ_Antenna_Manual_v2.1_2025_02_07.pdf
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