RX Audite SDR Switch

Main functions

• Frequency range: 0.1 to 60 MHz
  
• Version frequency: 48 to 75 MHz - VHF version
• Main TX/RX ANT splitter to two RX
• RX RF limiter protections for both RX outputs
• HPF (> 100kHz), high voltage and current protection at both RX outputs
• RX ANT (INBAND) 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 - see jumper switch
• Front panel Switch - SDR RX output to RX ANT (INBAND) during transmitting or all time
• Very high isolation when TRX transmitting and SDR goes to RX ANT (INBAND) 100 dB @ 14 MHz and 80 dB @ 50 MHz
• DC plug included
• Preamplifier as option version with PREAMP: insertion loss compensation, up to 14 dB of additional gain
• Preamplifier could be ON for SDR even controller is OFF
• Please, see also Frequently Asked Questins - FAQ
• ASSEMBLED and TESTED VERSION

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 - image
• 2-way RX splitter with low loss
• 2x RF limiter RX protections - the best on the market :)
• RX switch for RX ANT (INBAND) (only for SDR output) - settings
• Both antennas with HPF > 100 kHz (blocking AC noise)
• RX preamplifier (high IP3, 18 dB gain) with variable ATT - OPTIONAL - manual 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 output ports, INBAND RX and TX/RX ANT port

Parameters

• Supply voltage DC + 12 to 14 V (13.8 V recommended)
• Supply current DC max. 0.7 A with preamp
• Maximal TX power 250 W, recommended 200 W
• Very high isolation when TRX transmitting and SDR goes to RX ANT (INBAND) 100 dB @ 14 MHz and 80 dB @ 50 MHz
• PTT IN open PTT = RX, GND = transmitting
• PTT OUT sniffer (IN = OUT) or output FET (max. 35V DC and 0.5 A) - image
• PTT is not designed for QSK but you can use with right PTT lead/tail/TX delay time: min. 20/20 ms
• Default configuration SDR to the internal dummy load (older 2211xx to RX ANT (INBAND) input) while TRX transmitting - settings
• Optional Preamp preset to insertion loss + 6 dB (total gain about 10 dB)
• Low insertion loss see measurements picture
• TX insertion loss less than 1 W from 100 W @ 28 MHz

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

VERSION WITH PREAMP

Internal Preamplifier module

• 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 + about 6 dB (1S) of gain
• Bypass relays
• Could be switched ON even the controller has got power switch OFF - preamp for SDR output

Available as

ASSEMBLED: classic version - ready to use
ASSEMBLED: preamp version - ready to use
ASSEMBLED: VHF 6/4m version - ready to use - VHF version

• Optional preamp module
• 2-way small splitter
• 3-way small splitter
• RF adapters

Included in package

Audite switch assembled and tested
Optional preamp module assembled and tested (preamp version)
DC plug - image

Reviews

Read the online review by Rick Swenton, WR1S - pdf version
Read the QST review by Pete Smith, N4ZR

Manual

If you want to know more please check our wiki with RX Audite Switch manual.