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A cheap noise reducing speaker
- Many a good qso has been wrecked by that high pitched crackling noise that is common on weak signals
post 05 Feb 2025
RF Filter Links →
70Mc/s Low Pass Filter
The filter published there is working without problem and needs no or very little tuning
Passive LC CW audio filter
It helped a lot on MW in the presence of qrm, or when very weak signals had to be copie
A cheap noise reducing speaker
Many a good qso has been wrecked by that high pitched crackling noise that is common on weak signals
Band Filters
Real world signals include multiple frequencies over a wide range
A 160 meter receive-only band-pass filter
A 160-meter bandpass filter that passes 160-meter signals with little attenuation on the band and blocks AM broadcasts
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The filter published there is working without problem and needs no or very little tuning
It helped a lot on MW in the presence of qrm, or when very weak signals had to be copie
Many a good qso has been wrecked by that high pitched crackling noise that is common on weak signals
Real world signals include multiple frequencies over a wide range
A 160-meter bandpass filter that passes 160-meter signals with little attenuation on the band and blocks AM broadcasts
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