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1.8 to 54 MHz Low Pass Filter
A transmitter low pass filter design project was started with goals of low insertion loss, broad SWR bandwidth, mechanical simplicity, easy construction
post 17 Feb 2024
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70Mc/s Low Pass Filter
The filter published there is working without problem and needs no or very little tuning
Audio Filter & Speakers
Passive audio filters have been around for many years,If your receiver didn't have a CW filter, this little jewel worked fairly well
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
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The filter published there is working without problem and needs no or very little tuning
Passive audio filters have been around for many years,If your receiver didn't have a CW filter, this little jewel worked fairly well
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
Take off angle of horizontal antenna For horizontal polarization, the electric field will move sideways on a horizontal plane, while for vertical polarization it will oscillate up and down on a vertical plane
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
Calculo da Antena Bazooka A double bazooka antenna is a combination that has a complete coaxial wave multiplied by its velocity factor and a total end-to-end length of 1/4 wave for each side affected by another driver shortening facto