Inrad Roofing Filter

Please see our document titled a few words about roofing filters for more details.

Inrad roofing filter.

The amplifier provides enough gain to overcome the filter insertion loss. We provide a large selection of options for many different radio manufacturers. Two coax cables insert the roofing filter between the rf board and the 9 mhz if board. Select the radio of your choice below to find the filters and or roofing modifications you seek.

The plot below shows the sweep frequency response of the front end and first if filter in an ic 756proiii radio. 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. Able cost using inrad roofing filters. Installation is simple and requires soldering the 12v and ground wires.

The improvement in first if selectivity is dramatic. A supplied jumper cable connects back to the if board. The n1 n2 switching cable gets extended and plugged into the inrad board. 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.

This roofing filter can help reduce the third order intermodulation from multiple strong signals in the 2 to 20 khz region either side of the tuned frequency. 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. Yaesu ft 1000 ft 1000d roofing filter. A two screw terminal board connects to 12v and ground.

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. The wider curve is the oem response and the narrow curve is with the inrad roofing filter mod added. 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. A four position dip switch is used to set up the roofing filter function.

Twice another frequency referred to as the third order k f 1 f 2 2 response. The plot below shows the sweep frequency response of the rf board in an ic 775 radio. 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. One coax is moved and a coax jumper is added.

Here we take a look at how these inrad filters measure up to their yaesu alternatives. Filter insertion loss plus a few db.