Amateur roofing filter design

A key point in tapping maximum performance from the 1st mixer in actual operation say, CW operation is to prevent the outflow of unnecessary signals, other than the target signal, from the mixer to the subsequent stage. It achieves superior close-in dynamic range unattainable through conventional up-conversion formats. Even if the interference is a close-in frequency, the receiver maintains a relatively flat dynamic range, which you can tune without losing your target signal. The horizontal axis shows separation of the target signal by interfering signal frequencies two waves. The transceiver is also equipped with a pre selector function works on HF amateur band that varies its tuning frequency in tandem with the receiver frequency. It effectively dampens interference from strong signals that cannot be minimized through bandpass filters on dedicated amateur bands.

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Roofing Filters

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TSS | Amateur Radio | Communications | KENWOOD USA

Inrad Roofing Filter installation instruction. The text of the page is from the original installation instructions. The amplifier provides enough gain to override the filter insertion loss plus a few dB. The upper side of the board of the Inrad Roofing Filter.
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Roofing Filters: What are they, and how do they Help?

Included as standard directly after the 1st Mixer and Post Amp that compensates for conversion loss is a BW Hz and 2. Even when an interfering signal approaches the reception frequency, a virtually flat dynamic range is maintained. You can capture a clear signal even in reception conditions where strong adjacent interfering signals become problematic. As a result, the characteristics for reciprocal mixing due to the large input signal approaching the reception signal are improved.
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Take it all in, then filter out. An oversimplified view of roofing filters. There have been millions of words written about the subject of filters used in typical ham applications.
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