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2-way active splitter manual

The splitter or combiner 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 insertion loss of the splitter. Gain can be set as you need by the Variable ATT at PCB.

NOTE: 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.



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Applications
Splitter
Schematic
PCB
Tune and test points
KIT Assembling
Part list
Transformers


Applications

Only two way splitter without preamplifier

2way active splitter by qro.cz hamparts.shop


Example fot two RX with preamplifier

2way active splitter by qro.cz hamparts.shop


Example for RX and SDR with preamplifier

2way active splitter example by qro.cz hamparts.shop



Splitter

2way active splitter assembled in box qro.cz hamparts.shop



2way active splitter assembled qro.cz hamparts.shop


Schematic

2way active splitter pcb schematic by qro.cz hamparts.shop




PCB

2way active splitter pcb by qro.cz hamparts.shop




Tune and test points

Antenna Loop needs LOAD resistance at one side of the loop. It is connected between end of the loop and ground. Size of the Load Resistance (Rload) - depends on size of the loop and frequency. You can set optimal value what effect on SWR and F/B. It is not very critical and in the most cases you can switch to FIXed value.

2-way active tune and testing points by qro.cz hamparts.shop

1. Transistor BIAS setting

- this is trimmer (BIAS R4) which sets transistor bias current
- higher current means higher IP3
- recommended is 40 to 50 mA - higher currents need better cooling
- with bias current around 15 mA, the noise figure of the preamplifier is around 1
- for setting this bias current open jumper JP1 and measure it there

2. Current test points

- remove jumper (JP1)
- connect mA meter there (200 mA scale is fine)
- connect supply voltage
- turn the resistor trimmer (BIAS R4) and set bias current you want
- then connect jumper short back again

3. Input protection limiter

- this is diode limiter
- limites input signals to around 17 dBm
- together with PTC fuse works as high current protection
- diode limiter can give rise to the generation of harmonic and intermodulation distortion

4. Variable attenuator

- by this resistor trimmer you can set preamplifier gain as you need

5. Splitter impedance

- by this jumper JP3 you can set splitter impedance 50 or 75 Ohm




KIT Assembling

2way active splitter kit qro.cz hamparts.shop




pcb after assembling all the parts

2way active assembled pcb qro.cz hamparts.shop




Part list

NAME PART VALUE
GL 1-3 neon lamp lamp 65V AC
Q1 transistor 2SC5551
L 1-2 ferrite core FT50-75
BIAS trimmer 10KOhm
ATT trimmer 200Ohm
RE 1-2 relay G5V-12
Transformator binocular BN-73-6802
D2 diode LED diode
Wire wire 0.45 mm wire
IN, OUT 1-2 connectors SMA
DC power power jack



Transformers

- There are two binocular ferrites
- Both ferrites have got 2 turns - first with bifilar and second with trifilar winding

- Clean coating from the ends. Place wires in right order like on the pictures
- Check it again :)

transformer core

transformer core

Cut all wires to about 210mm (21cm) - 0.69 feet

transformer core cu wire



Make bifilar and trifilar wires - you can use small PVC tube and ACU drill

transformer core cu wire

transformer core cu wire

transformer core cu wire

transformer core cu wire

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The splitter or combiner is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads.
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The splitter or combiner is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads.
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