RX limiter with TX OFF manual

A small box with big features. It disconnects the RX path when transmitting (active PTT), limits the RF signal to a maximum of 13dBm (20mW) and also splits the PTT signal to another output. The PTT is optically isolated to provide additional protection. A red LED indicates the PTT status.

Applications

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

Parameters

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
PTT OUT FET 0.5A DC
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.

Block diagram

DC Connection

Measurements

Product details

Included in package

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

Box dimensions (mm)	58x50x24 - al box
Weight brutto (kg)	0.15 kg

Manufacturer:

Ing. Jan Šustr
ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe

General instructions:

Please also read general instructions before handling the product.

European Union Declaration of Conformity

Manufacturer Ing. Jan Šustr (QRO.cz):

ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe

declares that the assembled product:

RX LIMITER WITH TX OFF

is compatible with the relevant Union harmonisation legislation directives:
EMC Directive 2014/30/EU
ČSN EN 61000-6-3 ed. 2
ČSN EN 61000-6-1 ed. 2 (333432)

On behalf of Ing. Jan Šustr (QRO.cz)
Ing. Jan Šustr, CEO
7th May 2024