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SAWBird+ H1 filter review for hydrogen line radio observing of Milky Way

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I think this little Dongle sized device has revolutionised radio astronomy for amateur. About £30, consists of SAW filter at 1420MHz and cascaded amplifier = really helps pull out the hydrogen line at 1420.405MHz.

I dont have competitors' filters so can't compare to other options but invite anyone with those filters to submit comments here on how effective they are.


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