Active 2-way RX splitter board
The splitter is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads. This is active splitter version where you can switch ON high IP, low noise preamplifier and eliminate insert loss of the splitter. Gain can be set as you need by the Variable ATT at PCB.
This HW is designed only for RX line. There are some more high current and voltage protections on all ports. Both impedances 50 or 75 Ohm can be selected by the jumper.
Broadband: 0.1 MHz to 60 MHz 2-WAY Splitter Passive (4,5dB loss) or Active (up to 14 dB gain) Bypass of Preamp by relays Low loss, high gain, low noise, high IP3 preamplifier Front-end protections- high voltage / current 50/75 ohmimpedance - easy jumper switch
- Electrostatic protection with glim lamps.
- High power protection.
- Quality SMA connectors.
- Available as
- KIT : all parts + PCB
- Assembled : ready to use
- Impedance 50 or 75 Ohm
- NPN transistor 2SC5551A
- Supply voltage 12 - 14 V
- BIAS current 10 to 70 mA
- Supply current up to 180 mA includes relays!
- Gain: up to 14 dB
- Low Noise Figure (NF) 1,2 dB (20 mA 50 MHz)
- Low Noise Figure (NF) < 2 dB (60 mA 50 MHz)
- REAL IP3 34 dBm
- Input diode limiter about +17 dBm
- Bypass of Preamp without supply voltage
- Insert loss with preamp OFF: around 1,5 dB together with the splitter around 4,5 dB
- Insert loss with preamp ON: from about 20 dB loss (ATT with too high set) to 14 dB GAIN
- Isolation more than 20 dB, 160-40 m more than 30 dB
- SWR on OUT (splitted) ports better than 1:1,1 on HF, resp. 1:1,19 on 6 m
- SWR on IN port around 1:1,2 to 1:1,7 depends on gain of preamp (Optimal is 10dB)
- Maximal RF current 100 mA
- Maximal RF voltage around 65 V
Antennas splitter RX signal divider
KIT or assembled
The measured values
Isolation and SWR at OUT
In to Out, Preamp OFF
In to Out, Preamp ~10 dB
In to Out, Preamp max Gain
|Schematic and board pic||sch||brd|
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View and download the Shield Schematic and PCB files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic