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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 26th Jul 2021, 6:50 pm   #1
Aub
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Default Low Pass Filter Circuit ?

Hello all,

I've been trying to find a circuit diagram and other details for a Low Pass Filter for Amateur Radio use below 30mhz. The sort of thing often found in RSGB communications handbook, or maybe ARRL equivalent, back in the 50s and 60s. No torroids, but airwound coils and capacitors in T / Pi sections, with up to 100 watts of carrier power handling.

Many thanks

Aub
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Old 29th Jul 2021, 5:41 pm   #2
G3PIJpeter
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Default Re: Low Pass Filter Circuit ?

Have a look at
https://pa0fri.home.xs4all.nl/Divers...s%20filter.htm
half-way down the page for air core inductors.
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Old 29th Jul 2021, 5:53 pm   #3
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Default Re: Low Pass Filter Circuit ?

Hi Peter

Many thanks for that. It looks like just the sort of thing I'm after.

73

Aub
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