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RX Protection Limiter manual

This is technical manual page for RX protection limiter devices. There are two version of this device - you can buy the limiter in the box or pcb module which is designed to implement to your own hardware/design.

Protection limiter is able to protect your receiver against the high power RF signals and prevent from destruction. These high RF signals are common in the multi transmitter environment (contest QTH), this device also can limit strong RF peak from the close lightning. With the included SuperFuse you can protect against high current in the RX line and disconnect the circuit. This is big advantage compare to the best products on the market. In this technical article you can find how to use this protection limiter and where to put it to your ham shack.



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Applications
Parameters


Applications

- At the receiver port (RX ANT) of your TRX
- At the input port of RX preamplifier
- At the output of your RX preamplifiers - output could be 400mW!
- At the output of your RX ANT switch
- Diode RF limiter for signals higher than 10 dBm (10 mW)
- SuperFuse protects circuit against current higher than 100 mA
- Common-mode current insulator
- Low insertion loss



version in box with PL SO-239 connectors

rx protection limiter with pl so-239 connector qro.cz hamparts.shop



version in box with F connectors

rx protection limiter in box with f connector qro.cz hamparts.shop



pcb module version with SMA connectors

rx protection limiter pcb module with sma connector qro.cz hamparts.shop




Parameters

- Impedance 50 or 75 the same at ini/out
- RF limiter output
 +13 dBm (could be se to +17 dBm by jumper)
- SuperFuse break circuit
 when current is higher than 100 mA
- Neon lamps protect while > 65 V
- Low insertion loss
- Galvanic isolation IN to OUT
- Common-mode isolation
> 40 dB @ 160m, > 30 dB @ 40m, > 18 dB @ 10m


protection effect of the RF limiter

rx protection limiter in box effect of the limiter qro.cz hamparts.shop



protection effect of the RF limiter

rx protection limiter pcb module effect of the limiter qro.cz hamparts.shop



Where to place this device? There are many ways how to incorporate it into your equipment

rx protection limiter box how to incorporate qro.cz hamparts.shop



rx protection limiter pcb module how to incorporate qro.cz hamparts.shop



Related articles
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This device is impedance matching transformer for 75 to 50 or 50 to 75 Ohm. It's designed for your RX antenna system and offer more than impedance matching.
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