Product Description
LP-350A – Arc-Gas Lightning Transient Voltage Surge Protector
Protect your valuable radio equipment from damaging static buildup and lightning-induced voltage surges.
The LP-350A Arc-Gas Lightning Transient Voltage Surge Protector is a compact inline coaxial lightning arrestor designed to help protect sensitive radio equipment connected to outdoor antennas. Using Gas Discharge Tube (GDT) technology, the LP-350A provides a low-loss path for normal RF signals while diverting excessive transient voltage to ground when the protection threshold is exceeded.
With dual UHF female (SO-239) connectors, the LP-350A installs easily between the antenna feed line and radio equipment using standard PL-259 terminated coaxial cables. A dedicated grounding terminal provides a convenient connection to a properly installed station or earth ground.
Key Features
- Arc-Gas / GDT surge protection technology
- Protects against static buildup and transient voltage surges
- DC–500 MHz operating frequency range
- 50 Ohm impedance
- Less than 0.1 dB insertion loss
- 350 VDC nominal discharge/breakdown voltage
- Handles approximately 300–350 Watts PEP, depending on operating conditions/variant
- Dual UHF female (SO-239) connectors
- Compatible with standard PL-259 coaxial connections
- Dedicated grounding terminal
- Compact inline design
- Field-replaceable gas discharge cartridge
- Suitable for amateur, CB, GMRS, and commercial two-way radio installations
Technical Specifications
| Product Type | Coaxial Lightning Surge Protector |
| Protection Technology | Gas Discharge Tube (GDT) / Arc-Gas |
| Frequency Range | DC–500 MHz |
| Impedance | 50 Ohms |
| Maximum Power | 300–350 W PEP* |
| Insertion Loss | < 0.1 dB |
| Discharge Voltage | 350 VDC |
| RF Connectors | 2 × UHF Female (SO-239) |
| Cable Connection | PL-259 Male |
| Ground Connection | Dedicated Ground Terminal |
| GDT Cartridge | Field Replaceable |
| Dimensions | Approx. 66.5 × 40 × 20 mm |
| Configuration | Inline |
*Power rating can vary by source, operating frequency, and specific LP-350A variant.
How It Works
During normal operation, the LP-350A allows the RF signal to pass through with minimal insertion loss. If an excessive transient voltage reaches the coaxial line, the gas discharge tube conducts and provides a path toward the grounding terminal, helping divert the surge away from the connected radio equipment.
This makes the LP-350A particularly useful for installations where antennas and coaxial feed lines are exposed to outdoor electrical activity.
Typical Applications
- Two-Way Radio Communications
- HF, VHF, and UHF base stations
- Outdoor antenna systems
- Fixed-station transceivers
- Home base stations
- Vehicle and RV installations
- External antenna systems
- Dispatch stations
- Security communications
- Fixed radio installations
Static Protection
- Helps dissipate accumulated static charge on outdoor antenna systems
- Provides protection against transient electrical events associated with nearby lightning activity
Installation Note
For effective surge protection, the LP-350A's grounding terminal should be connected using a short, low-impedance grounding conductor to a properly engineered station/earth ground system. A coaxial surge protector should be considered part of a complete grounding and lightning-protection system—not a guarantee against a direct lightning strike.
Other Details
See warranty details aboveProduct Videos
Custom Field
Product Reviews
4 Reviews Hide Reviews Show Reviews
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Well Made
Well made. This is the third one I have bought. The two others are giving great protection on other antennas I have built. Low-loss too.
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5 Stars
I've looked over all the previous reviews and I've looked over all the specs. Dollar-for-dollar this is your best buy.
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I really won't know until and if it ever fails
I really won't know until and if it ever fails.
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Looks Very Good
Design looks very good. Haven't had a lightening strike to prove it works but I believe it will.
