Inrad Roofing Filter

We provide a large selection of options for many different radio manufacturers.

Inrad roofing filter.

A four position dip switch is used to set up the roofing filter function. The icom ic 756proiii roofing filter mod consists of a 6 pole 4 to 5 khz wide filter followed by a high dynamic range feedback amplifier. The wider curve is the oem response and the narrow curve is with the inrad roofing filter mod added. The 3oimd response of your receiver can generate an interfering signal s right on top of the one you are listening to from two or more signals outside your lis.

Filter insertion loss plus a few db. 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. This section allows you to select specific add on features for your particular rig manufacturer. This mod works in all versions of the yaesu ft 1000mp line of radios.

Twice another frequency referred to as the third order k f 1 f 2 2 response. Installing the inrad roofing filter the mp roofing filter mod consists of a 6 pole 4 khz wide filter followed by a high dynamic range feedback amplifier. The n1 n2 switching cable gets extended and plugged into the inrad board. The improvement in first if selectivity is dramatic.

Please see our document titled a few words about roofing filters for more details. The amplifier provides enough gain to override the filter insertion loss plus a db or two. One coax is moved and a coax jumper is added. The amplifier provides enough gain to overcome the filter insertion loss.

The plot below shows the sweep frequency response of the rf board in an ic 775 radio. Yaesu ft 1000 ft 1000d roofing filter. Able cost using inrad roofing filters. Inrad roofing filters for the ft dx5000 bench results and observations based on an idea from daniel sandu yo3gjc inrad has taken their stock series of 9mhz filters and fitted them to a daughter card allowing drop in use in the yaesu ft dx5000 series rigs.

The plot below shows the sweep frequency response of the front end and first if filter in an ic 756proiii radio. A supplied jumper cable connects back to the if board. A two screw terminal board connects to 12v and ground. New products coming for 2017 release from inrad nov 16 2016 455 khz collins mechanical filters for aor collins ten tec yaesu stock as available only nov 2 2016 roofing filters for yaesu ftdx5000 mar 1 2014 filters for the collins 32s 3 oct 1 2012 455 khz if filters for jrc radios sept 15 2012.

Two coax cables insert the roofing filter between the rf board and the 9 mhz if board. Installation is simple and requires soldering the 12v and ground wires.