Roofing Filters Ham Radio

It is usually found after the first receiver mixer.

Roofing filters ham radio.

The term roofing stems from the fact that it protects the rest of the radio following it from out of the passband signals. Roofing filters are the wave of the future and are a highly recommended feature. This new transceiver has crystal roofing filter technology that has been proven in the ftdx 5000. Equipped with 500 hz 2 7 khz roofing filter as standard 1st if frequency 11 374 mhz down conversion is employed when receiving on 15 20 40 80 or 160 meter bands.

The down conversion 9 mhz 1st if frequency receiver construction can realize narrow 300 hz optional 600 hz and 3 khz bandwidth roofing filters. High performance reception and improved adjacent dynamic range. Inrad presently also serves as the oem roofing filter supplier for the popular elecraft k3 k3s series of hf transceivers. Think of the roofing filter as a roof on a house the wide filter allows the dsp and hardware agc to respond to all the rain falling on the roof.

There are two basic designs for modern radios. To reduce the amount of rain falling on the roof a more narrow roofing filter is required. 300 hz cw narrow crystal filter for the ftdx 3000. O needs vhf roofing filters wide cheap or narrow expensive o excellent image rejection o close in dr varies down conversion architecture 9 mhz typical 1 st if o performance near if is not uniform o image rejection near ham bands requires design attention o needs only hf roofing filters narrow cheap.

The goal of a roofing filter is to limit the passband of the first intermediate frequency if stage. The yaesu ftdx3000 transceiver should provide weak signal receiver performance in crowded strong signal environments because of the receiver s down conversion roofing filters. Using a more narrow roofing filter can eliminate this unwanted signal and eliminate the agc pumping. If you re in the market for a new radio you would be ahead of the game to look at one with a roofing filter.

Basically a roofing filter is simply the first if filter in a radio. It is usually placed as clos e to the first mixer as possible in order to be effective. In the 21st century inrad has evolved from only a filter company into a general supplier and manufacturer of various goods for the active amateur radio operator. The yaesu does have more roofing filters and an lcd screen.