1st Jan 2023, 2:25 pm
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#41
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Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Full-Range IF Selectivity; The Hammarlund Variable Crystal Filter
The HRO-5A1 had switched selectivity settings using capacitors, response curves also shown in the manual:
http://www.tubebooks.org/Books/Atwoo...onalHRO5A1.pdf
Lawrence.
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