RX Audite - TRX/SDR splitter and switch

This is my new RX splitter and TRX switch. Including string of protections, optional preamplifier and INBAND RX antenna input. You can find more at: this link.

Main functions:

• Frequency range: 0,1 to 60 MHz
• Main TX/RX ANT splitter to two RX
• RX RF limiter protections for both RX outputs
• Isolated SDR RX output + Common-Mode filter
• HPF (> 100kHz), high voltage and current protection at both RX outputs
• INBAND RX ANT input - works only for SDR output
• TX-RX switch controlled by the PTT
• Designed for 2nd RX, WEB-SDR, SKIMMER or Panadapter
• Controller OFF = TX/RX ANT port to SDR RX out via RF limiter protections - Skimmer/web-SDR
• Controller ON = TX/RX ANT port splitted to TRX and SDR RX out via RF limiter protections
• TRX TX to main TX/RX ANT = SDR RX out to dummy load or INBAND RX ANT input via RF limiter protections
• Front panel Switch - SDR RX output to INBAND RX ANT all time
• Preamplifier (optional): insertion loss compensation, up to 14 dB of additional gain
• Preamplifier could be ON for SDR even controller is OFF (both by the front panel switches)
• Very high isolation when TRX TX and SDR to INBAND 100 dB @ 14 MHz and 80 dB @ 50 MHz
• Please, see also Frequently Asked Questions There FAQ

One black box but many different parts inside:

• TX / RX switch controlled by PTT signal
• PTT splitter (IN/OUT) in sniffer mode (IN directly to OUT) or output PTT FET switch picture
• 2-way RX splitter with low loss
• 2 x RF limiter RX protections - the best on the market :-)
• RX switch for INBAND RX antenna (only for SDR output) settings
• Both antennas with HPF > 100 kHz
• RX preamplifier (high IP3, 18 dB gain) with variable ATT - OPTIONAL link
• RX lines with High Voltage protections > 60 V AC
• RX lines with SuperFuse current protections > 100 mA
• Very high isolation TX to SDR, between RX ports, INBAND RX and TX/RX ANT port

Parameters:

• Supply voltage DC + 12 to 14 V (13,8 V recommended), DC plug cable
• Supply current DC max. 0,7 A with preamp
• Maximal TX power 250 W, recommended 200 W
• Very high isolation when TRX TX and SDR to INBAND 100 dB @ 14 MHz and 80 dB @ 50 MHz
• PTT IN compatible with 5V logic or higher, TX = GND
• PTT OUT sniffer (IN=OUT) or output FET (max. 35V DC and 0,5 A) picture
• PTT is not designed for QSK but you can use with right PTT lead/tail/TX delay time: min. 10/10 ms
• Default configuration SDR to INBAND RX ant input while TRX TX settings
• Optional Preamp preset to insertion loss + 6 dB (total gain abt 10 dB)
• Low insertion loss see measurements picture

RF limiters:

• Limiter for RF signal to + 13 dBm = 20 mW (could be + 17 dBm) @ 50 Ohm
• Current SuperFuse - the only at market
• Can survive high input power (current) for long time
• The soft clipping reduces the IMD products of a classic hard diode clip limiter

Internal Preamplifier module: (OPTION / version with preamp) link

• Preamplifier could be retrofitted also by you - customer
• High IP3 preamplifier module with 18 dB gain
• With 2SC5551 transistor
• Real OIP3 is +34 dBm
• Preset to 40 mA @ 13,8 V
• Low Noise Figure (NF) < 2 dB (60 mA 50 MHz)
• Variable gain by output ATT
• Preset to 10 dB for TX/RX ANT to both RX outputs = insertion loss + abt. 6 dB (1S) of gain
• Bypass relays
• Could be switched ON even the controller has got power switch OFF - preamp for SDR output.