RX limiter with TX OFF

Simple RF limiter and RX antenna disconnector for your receiver

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78.65 € (tax incl.)
78.65 €
65.00 € (without tax)
in stock, shipped in 2-3 days

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The lowest price in the 30 last days was 78.65 €

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The main purpose of this box is to disconnect the RX antenna from the receiver during transmission using a PTT signal, then the receiver is protected by an RF limiter which limits the maximum signal level and also acts as a common mode filter.

A PTT signal is required to disconnect the RX antenna during transmission. To ensure that you don't lose the PTT signal output from your equipment, this box also has a PTT splitter and a RCA connector with PTT output. The whole PTT logic protects the PTT input - optically isolated - and also allows you to connect other equipment such as a PA etc.. In this way, the box also functions as a protection and separation of the PTT signal from the TRX.

The RF limiter limits the maximum signal level to the RX. This is approximately +13dBm (20mW). The intelligent SuperFuse will protect the RX even if there is a 100W signal at the input of this box and the signal from the antenna is not disconnected by the PTT signal!


  • Receiver protection
  • Disconnect for RX antenna while TX
  • RX RF signal limiter

Main functions

  • Broadband: 0.1 MHz to 60 MHz
  • Small relay short RF when PTT active
  • RF limiter to typ. 13 dBm
  • High voltage and current protections
  • LED diode for PTT
  • PTT IN with optocoupler
  • PTT OUT with 0.5 A FET switch
  • DC plug included
  • 4pcs self adhesive feet pads included
  • Aluminium enclosure: W x H x L = 58 x 24 x 50 mm


  • Frequency range 0.1 MHz to 60 MHz
  • Supply voltage DC 12 V (12 to 14)
  • DC current typ. 70 mA
  • High RF voltage and current protection (90 V, 100 mA)
  • PTT IN current typ. 6 mA
  • PTT IN transmitting = connecting to GND
  • Insertion loss lower than 2 dB
  • Isolation (PTT TX) > 80 dB @ MHz
  • LED shows PTT active - RED

NOTE: The PTT circuit only works when DC power supply is applied. PTT OUT does not work without DC power.

Available as

ASSEMBLED with BOX: ready to use

Included in package

Limiter assembled and tested
DC plug - image
4pcs self adhesive feet pads - image


If you want to know more please check our wiki with RX limiter with TX OFF manual.

rx limiter with tx off assembled in enclosure by qro.cz hamparts.shop

measurement rx limiter with tx off assembled by qro.cz hamparts.shop

block diagram rx limiter with tx off by qro.cz hamparts.shop

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Product Details

Data sheet

in enclosure
both 50 & 75 Ohm
front-end protection
input and output
frequency range
0.1 MHz to 60 MHz
product dimensions
58x50x24 mm - al box
product weight (brutto)
0.14 kg
package dimensions
12x10.5x4.5 cm
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