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RX Coax Match & limiter with CMCC BOX

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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Description

This RX Protection limiter with CMCC (common-mode current choke) BOX 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, but also it can limit strong RF peak from the close lightning. Simply, but powerful, high voltage protection limits AC voltage peaks to 65 V. Transformators work as isolation and Common-mode current as filter.

The SuperFuse protects against high current in the RX line and disconnect the circuit. This SuperFuse is big advantage compare to the best products on the market. Thanks to the circuit construction there is minimal problem with IMD. Limiter works for the signals higher than 20 mW. This device do not degrade the dynamic range of the receiver. The signal which is limited by this protection is usually higher than the value which is in the dynamic range of most receivers on the market.


Using & Where to put this box

  • In ham shack: 75 Ohm coax from antenna - 50 Ohm to RX
  • 50 Ohm ANT - this box - 75 Ohm coax - this box - 50 Ohm RX
  • RF power limited to 13 or 17 dBm

Main functions

  • Coax impedance matching 75 to 50 or 50 to 75 Ohm
  • Low insertion loss
  • Diode RF limiter for signals higher than 10 dBm (10 mW) - 13 dBm hard limit
  • SuperFuse protects circuit against current higher than 100 mA
  • Neon lamps light up with AC voltage higher than 65 
  • Common-mode current insulator
  • High RF isolation
  • Input to Output coax ground isolation
  • High quality connectors
  • IP56 box - recommended to protect it against rain and snow
  • Feeder size 100x100 mm
  • ASSEMBLED and TESTED VERSION

Parameters

  • Impedance matching 75 to 50 or 50 to 75 depends on connection
  • 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 AC
  • Low insertion loss
  • Galvanic isolation IN to OUT
  • Common-mode isolation > 40 dB @ 160m, > 30 dB @ 40m, > 18 dB @ 10m

Available as

ASSEMBLED BOX: ready to use
Connectors: PL SO-239 and F

Manual

If you want to know more please check our wiki with RX Coax Match & limiter manual.



one version with F and PL SO-239 connectors

rx coax match and limiter with cmcc box by qro.cz hamparts.shop



rx coax match and limiter with cmcc in box protection effect qro.cz hamparts.shop



rx coax match and limiter with cmcc in box by qro.cz hamparts.shop



limiter OFF

measure rx coax match limiter with cmcc box by qro.cz hamparts.shop



limiter 13 dBm

measure rx coax match and limiter with cmcc box by qro.cz hamparts.shop



limiter 17 dBm

measure rx coax match and limiter with cmcc box by qro.cz hamparts.shop



common-mode isolation

measure rx coax match and limiter with cmcc box by qro.cz hamparts.shop



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Product Details

Data sheet

type
ASSEMBLED
design
in enclosure
usage
RX
impedance
both 50 & 75 Ohm
front-end protection
input and output
frequency range
0.1 MHz to 30 MHz
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