News Mysterious radio signals from deep space detected

Marijn

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Astronomers have revealed details of mysterious signals emanating from a distant galaxy, picked up by a telescope in Canada.

The precise nature and origin of the blasts of radio waves is unknown.

Among the 13 fast radio bursts, known as FRBs, was a very unusual repeating signal, coming from the same source about 1.5 billion light years away.

Such an event has only been reported once before, by a different telescope.
https://www.bbc.com/news/science-environment-46811618
 

mahdavi3d

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I couldn't find a lot about the exact Low Noise Amplifier they are using to capture waves/signals at the front-end of other circuitries; except maybe it is a solid state one! (CHIME antennas are custom-designed to have good sensitivity from 400 to 800 MHz, in both linear polarizations. This gives CHIME its large frequency coverage. Signals from the antennas are amplified in two stages, using low-noise amplifiers developed by the cell-phone industry. https://chime-experiment.ca/instrument - The 2048 analog signals originating at the 1024 dual polarization feeds are amplified on the focal line using low-cost, low-noise amplifiers that provide a noise equivalent system temperature of less than 50 K across the band. The signals are transmitted 60 meters on coaxial cables to nearby RF-shielded enclosures. The signal is then amplified, band-pass filtered to 400-800 MHz, and input to custom FMC digitizer daughter boards on the ICE motherboards. https://www.groundai.com/project/ic...cope-signal-processing-and-networking-system/).

If I understood correctly, they are using Cloverleaf antenna in the array focal line acts as pre-LNA requirement.

Pathfinder_analog_chain_block_diagram.png

The analog system signal chain overview. The clover-leaf feed receives the sky signal. The received signal is then amplified by the low-noise amplifier block by 35 to 44\,dB across the 400-800\,MHz band while adding ∼35\,K noise. The signal is then transmitted over 60\,m of LMR-400 coaxial cable to a central RF-shielded enclosure. The signal is attenuated there by approximately 6\,dB, customized to each amplifier chain. The signal is then bandpass filtered to 400-800\,MHz and further amplified by ∼41\,dB to achieve an input to the ADC of −21\,dBm power.
http://inspirehep.net/record/1299850/plots?ln=en
 
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