This small box is used to disconnect the RX antenna from your unit when it is switched off. When off, it diverts any overvoltage from the antenna to a ground screw that must be connected to a good ground. When switched on, this protection is still in place, but the extra RF signal passes through an RF limiter that restricts the maximum RF signal level.

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Applications
Parameters
Block diagram
Measurements
Product details

Applications

- Receiver protection
- Disconnect RX antenna without DC voltage
- RX RF signal limiter
- Electrostatic Energy Arrester

Parameters

Frequency range 0.1 MHz to 30 MHz
Supply voltage DC 12 V (12 to 14)
DC current typ. 50 mA
High RF voltage and current protection (90 V, 100 mA)
Contact isolation: 1500 V
Insertion loss lower than 1.6 dB @ 14 MHz
Isolation > 40 dB @ 10 MHz
S11, SWR matching: > 23 dB, 1:1.15
RF limiter, typ. 13 dBm
75V arrester at RF and to GND screw
LED = connected

⚠ NOTE: The RF signal is isolated when the DC power supply is disconnected. Connect GND screw to good ground for proper protection function.

Block diagram

DC Connection

Measurements

Insertion loss

Disconnect isolation

S11 and SWR matching