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Old 20th Dec 2022, 11:10 pm   #30
AdrianH
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Join Date: Mar 2020
Location: Blackburn with Darwen, Lancashire, UK.
Posts: 1,572
Default Re: Quick question on the CODAR AT5, if anyone has one to hand.

This is from the 1968 RSGB manual and has the broadband for 1.8 MHz with a choke and what I would recognise as a doubler for 3.5 MHz.

If I can I will try for this type of circuit.
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