GI300 Galvanischer Antennen Isolator

Galvanic Antenna Isolator GI300

This product is replaced by the successor GI1000.

The GI300 suppresses noise reaching the ground connections on the receiver. The GI300 covers a wide-band range of 30 kHz – 300 MHz (typ. 1db insertion loss). The unit can be used in many receiving applications, It will also work with frequencies up to 1 GHz but above 300 MHz insertion loss may increase by up to 3db. The unit also has integrated double over-voltage protection and input and output are blocked for DC voltage.

The galvanic isolator GI 300 separates the path of the direct current between the outer shield of the coax cable and the shielding of the antenna feeding line in order to suppress interference caused by potential differences. This is achieved by using a small toroidal transformer. The inner conductor of the coax cable is insulated with capacitors providing coarse and fine voltage surge protection.


Excellent protection against sheath waves and voltage surges.Double voltage surge protection. On the antenna side Gas Discharge tube with an ignition voltage of 90v. On the receiver side you will find an ESD-diode (30KV; max.pulse power 350W (8/20μs) Input and output has been blocked for direct currents of max. 50V.

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The GI 300 is very useful for owners of a PERSEUS SDR who still own the original switching power supply. This little troublemaker has made life hard for many a PERSEUS owner.



Caution: Only suitable for reception purposes!

High RF performance (> + 10dBm) cause permanent damage!

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WRTH 2023


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