Inrad Roofing Filter

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.

Inrad roofing filter.

One coax is moved and a coax jumper is added. 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 n1 n2 switching cable gets extended and plugged into the inrad board. 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. The improvement in first if selectivity is dramatic. 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.

A two screw terminal board connects to 12v and ground. We provide a large selection of options for many different radio manufacturers. This section allows you to select specific add on features for your particular rig manufacturer. Installation is simple and requires soldering the 12v and ground wires.

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. Filter insertion loss plus a few db. A supplied jumper cable connects back to the if board. The amplifier provides enough gain to override the filter insertion loss plus a db or two.

Yaesu ft 1000 ft 1000d roofing filter. Please see our document titled a few words about roofing filters for more details. 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. Able cost using inrad 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. Two coax cables insert the roofing filter between the rf board and the 9 mhz if board. 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.

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.