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This 3-way small splitter is a very useful device. It can provide equal voltages, equal current, or equal power to matched or unmatched loads. Like all passive splitters and combiners, this device is less than ideal. Isolation is maximum only when at least one port is properly terminated; in this case isolation between the three splitted/combined ports is maximum when the main port is properly terminated. This HW is designed only for RX line — it is not rated for transmit power. Both impedances 50 or 75 Ohm can be selected by the jumper, so it drops straight into an existing 50 Ω antenna setup or a 75 Ω receive-antenna distribution system.
How it works
Inside the enclosure, the common port connects to a passive resistive splitter network. On the splitter side, the signal is divided three ways with equal voltage, current or power onto each port; used in reverse as a combiner, the same network sums the three input ports onto the single common port. Isolation between the three split/combined ports is maximum when the main port is properly terminated, so a mismatched or disconnected antenna on one port has minimal effect on the other two.
RX antenna splitter for the three RX
RX antenna combiner for 3el Beverage array
Specifications
| Frequency range | 0.1 – 60 MHz |
| Ports | 3-way + common port |
| Impedance | 50 or 75 Ω (jumper select) |
| Insertion loss, typ. | around 1 dB |
| Split (incl. insertion loss) | 4.8 dB / around 5.8 dB total |
| Isolation | >18 dB middle port, >23 dB 1st/3rd port |
| SWR, split ports | better than 1:1.15 (HF), 1:1.25 (6 m) |
| SWR, main port | around 1:1.3 (HF), 1:1.4 (6 m) |
| Connectors | SMA |
| Enclosure | Aluminium, W×H×L 58×24×50 mm |
| Usage | RX line only, assembled & tested |
Gallery
Measurements
Typical S-parameters measured on a production unit, swept across the HF bands.
I/O port 1 |
I/O port 2 |
I/O port 3 |
Isolation 1↔2 |
Isolation 1↔3 |
Isolation 2↔3 |
Port 2 → I/O |
Port 3 → I/O |
Available as
|
Assembled, in box Built, tested and ready to use straight out of the aluminium enclosure. View product → |
Kit All parts plus PCB for self-assembly. View product → |
PCB only Just the board, for your own build and enclosure. View product → |
In the box
- Splitter assembled and tested
- 4pcs self adhesive feet pads
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