This is very powerful device combines TRX switch, RX splitter, RF limiter protection for both RX outputs, INBAND RX antenna input and optional RX preamplifier. You can share your main TX/RX ANT to two RX with RF power limiter protection.
This is ideal solution for Spectrum Panadapter, WebSDR or Skimmer Server – RBN.
When the controller is OFF then main TX/RX antenna goes to the SDR RX output – with 10 mW RF limiter protection. You can switch ON preamplifier even you left controller OFF by the POWER switch. When the controller is ON, Main TX/RX antenna is shared between TRX and SDR outputs. During TXing, the SDR RX output can be connected to the internal dummy load or to the INBAND RX antenna input. You can switch the SDR RX output to the INBAND RX ANT port not only while the TRX is TXing, but by the front panel switch, it can be switched all time. Optional HIGH IP3 internal preamplifier can be used for insertion loss compensation. Additional gain is variable, up to 14 dB.
Main functions:
- 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
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
- 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)
- Both antennas with HPF > 100 kHz
- RX preamplifier (high IP3, 18 dB gain) with variable ATT – OPTIONAL
- 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)
- Supply current DC max. 0,7 A with preamp
- 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)
- Default configuration SDR to INBAND RX ant input while TRX TX
- 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)
- 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.
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