MORGAN SYSTEMS 302/304 VHF-UHF & 303 HF SUPPRESOR/ARRESTORS · VHF/UHF & Yagi
A VHF/UHF radiator, directional antenna, or related component.
Why operators make room for it
Build a portable VHF/UHF position with purpose
Portable VHF/UHF work becomes far more intentional when the operator can control where the signal goes and how the antenna is polarized.
That is where MORGAN SYSTEMS 302/304 VHF-UHF & 303 HF SUPPRESOR/ARRESTORS enters the kit. 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.
For the operator, that means a station that can be aimed and verified for the intended path, with assembly order, polarity, support, and clearance treated as part of performance.
Quick product reference
Key Specifications
- Product type
- VHF/UHF & Yagi
- Primary role
- A VHF/UHF radiator, directional antenna, or related component.
- Deployment role
- Element order, polarization, and direction are configuration-dependent
- Verification
- Confirm SWR and safe clearance before transmitting
- Assembly rule
- Confirm element order, boom position, polarity, and feedpoint orientation
- Polarization
- Select horizontal or vertical polarization for the intended signal path
- Feed-line requirement
- Match connector, impedance, loss, length, and weather protection
- Directional use
- Aim and secure directional configurations before transmitting
Operator decision support
Plan the complete setup
See what this product is best suited for, what the documented setup needs, and the boundaries to confirm before deployment.
- Best for
Portable VHF/UHF work becomes far more intentional when the operator can control where the signal goes and how the antenna is polarized.
- What else you need
Aim or rotate a directional configuration toward the intended station, repeater, or signal path.
- Limitations
Confirm element order, boom position, polarity, and feedpoint orientation
What an operator can do
- Assemble the antenna in the documented element order, polarity, and boom orientation.
- Aim or rotate a directional configuration toward the intended station, repeater, or signal path.
- Verify feed-line routing, connector security, SWR, and safe clearance before transmitting.
Complete product details
Morgan Systems RF M-302 coax arrestor (VHF/UHF)
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.
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 3.25"x1.75", 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.
Model: M-302
Frequency Range: 50-500 MHz
Impedance: 50 ohms
Power handling: UHF,N : 300W PEP, 150W CSS
BNC: 150W PEP, 75W CSS
Connector type: UHF
Uses: Protection of transmit/receive equipment using coax.
Morgan Systems RF M-303 coax arrestor (HF)
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-303U-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. Unit will bleed static and carries a 3kw rating as does the standard M-303. Also available with N connectors (M-303N-PP). M-303U-O: Same as standard M-303, but comes with offset connectors as shown in picture above. M-303U-D, M-303N-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).
Available models cover the frequency range from as low as 100KHz to 1,000MHz. with lots of connector choices. 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.
Model: M-303
Frequency Range: 1.5-54 MHz
Impedance: 50 ohms
Power handling: 3KW PEP, 1.5KW CSS
Connector type: UHF, N
Uses: Protection of transmit/receive equipment using coax cable.
Morgan Systems RF M-304 coax arrestor (VHF/UHF)
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-304ND: 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.
Model: M-304
Frequency Range: 50-500 MHz
Impedance: 50 ohms
Power handling: N : 1KW PEP, 500 W CSS
UHF: 1KW PEP, 500 W CSS
Connector type: UHF, N
Uses: Protection of transmit/receive equipment using coax.
