Ham Radio Roofing Filters

A roofing filter is a type of filter used in a hf radio receiver. Sales supplies and service. To reduce the amount of rain falling on the roof a more narrow roofing filter is required.

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But a roofing filter can be equally at home at a low first if if that is how the radio is designed.

Ham radio roofing filters.

Protects following circuits from nonlinear operation due to strong out of band signals what. Mcf or discrete crystal construction width. Implementing the extra sharp crystal roofing filters provides superior close in dynamic range and affords the best receiver performance possible. Inrad has supplied aftermarket and oem crystal filters for amateur radio transceivers and shortwave radio receivers with more than 250 different models available for equipment dating from the 1950 s to the present day since our beginning offering yaesu filters as fox tango international way back in the 1970 s.

Inrad presently also serves as the oem roofing filter supplier for the popular elecraft k3 k3s series of hf transceivers. It comes with a 2 7 khz roofing filter which is very good for all bands and modes. For the ft 1000mp the mod is plug in with no soldering required and can be easily removed. In addition the transceiver has provisions for adding up to 4 additional crystal roofing filters in widths like.

In my case that moves the if gain from 12 to 10. Upon doing this procedure the audio hiss is greatly reduced enabling much better long time ssb listening and also much better readability. Inrad procedure calls for installing the filter and then reducing the ifgain by 2. Using a more narrow roofing filter can eliminate this unwanted signal and eliminate the agc pumping.

Sized to pass the widest mode of operation improve dr3 begins with. 300 hz cw narrow crystal filter the down conversion 9 mhz 1st if frequency receiver construction can realize narrow 300 hz optional 600 hz and 3 khz bandwidth roofing filters. In short inrad roofing filter amplifies the input signal. World s largest supplier of amateur radio ham radio and communication equipment.

The goal of a roofing filter is to limit the passband of the first intermediate frequency if stage. A roofing filter protects later stages including amplifiers mixers narrower filters and dsp subsystems just as the roof on your house keeps rain out ofall of the rooms. Roofing filter basics where. It is usually found after the first receiver mixer.

It still provides the same protective function. 200 hz 400 hz 500 hz 1 8 mhz 2 1 mhz 6 mhz and 13 mhz. 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. First filter as close to the antenna as possible 1 st if typical why.

Yaesu ft 1000mp mkv field roofing filters. Inrad roofing filters can substantially reduce the third order intermod from multiple strong signals in the 2 20khz range on either side of the tuned frequency.