Hits
TVI Stop filter
What to do, if your neighbour comes banging at your door just in that moment you want work the DX of the year
post 10 May 2026
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
72
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