Morgan Systems M-304 coax arrestor

Like no other protective device in the world for RF coaxial cable lines, Morgan’s M-300 Series arrestors offer a complete, nearly perfect blocking/shunting system for induced voltages. Whether produced by lightning (directly or indirectly coupled), wind, rain, or snowfall MMI arrestors are continuously active, constantly draining transmission line center conductor to ground. The result? Solid protection for station equipment and related noise.

All M-300 Series units feature heavy discharge toroidal inductors used to neutralize developed voltages on the antenna side of a central high-voltage blocking capacitor(blocks DC voltage through the unit). Inert gas tubes are used to limit the natural back-EMF voltages often induced across an inductor when large fast rising input currents are presented to the unit.

New variants: M-304U-PP:  Power pass version allows up to 50VDC to pass through the arrestor to allow mast mounted pre-amps, switching relays, etc. to operate through the coax.  They also have a wider frequency range of DC to 500 MHz. Unit will bleed static and carries a 1kw rating as does the standard M-304.  Also available with N connectors (M-304N-PP).  M-304U-D, M-304N-D:  Double units are two units with one footprint to save space in entry panels and junction boxes.  

Sold and used worldwide, our arrestors are the first line of defense in lightning protection employed by such services as the U.S. Army, Boeing Corporation (Commercial Airplane Division), AT&T, NASA, and a wide variety of Commercial Broadcast, Public Safety, Emergency Relief, Government, and Amateur interests. Our arrestors can be found in the most stark surroundings, from dense African jungles to the vast wastelands of some of the world’s most punishing deserts. You can even drive a truck over the top of the chassis without damaging the contents (actually, you can do that to most MMI products).  All units feature Teflon connectors. All may be mounted on flat surfaces, grounding bulkheads, or through-mounted using dual stainless steel grounding screws for mechanical fastening. Packaged with an informative owner’s manual.   Mounting footprint/contact area on a conductive mounting surface is 3.25" x 1.75", overall dimensions 3.25" x 2.75" x 1.875" tall.

Coaxial lightning arrestors for frequencies above 50 MHz use the same technology as lower frequency units described above and are all constructed in our standard arrestor housing. M-302, 304, and 306 are ideal for terrestrial repeater or point to point services, commercial broadcast or cellular applications, long distance scatter, EME, etc. Each unit includes high voltage blocking between input and output ports with antenna side of arrestor connected through near dead-DC short inductor to ground(case), draining center conductor of earth connections.