4SQ-8DIR antenna system
The four-square phased-vertical array if used by many contesters and DXers for oreration on the low bands. This construction modify a conventional four-square to provide eight directions of fire instead of the normal four. This another four directions are located at points which are mid-way between the existing four. Total of eight selectable beam-headings spaces 45deg apart. When beaming through a corner (as in conventional four-square) the current in the two middle elements lags that of the rear element by 90deg, while the current in the front element lags that of the rear element by 180deg. When firing through the sides of the square, there are two front elements and two rear elements. Now the currents in the front elemets lag those of the rear elements by 90deg.
This is 4 Square 8 Direction antenna system. Based on K3LC design
Please read this great article about 4-SQ by Franz DF6QV.
Photos by Carsten Dauer and Lucik
Main functions:
- Eight directions phased vertical array
- Dummy load power indicator info
- High SWR protections
- Segment switch by the external relay info
RF hybrid box:
- Power version HP
- Designed for 100 Ohms! So Elements MUST have 50 Ohms in feed point
- MP up to 3,5kW
- HP up to 6kW
- Very good dummy load isolation. More than 25dB
- Controlled by 8 wires. Simply RJ-45 UTP CAT-6 cable is fine.
- High quality ATC capacitors
- BIG cores T225-2B and T300-2D + QRO64-2D-61 with 2,5mm Cu wire
- Quality PTFE SO-239 connector. N or 7/16 DIN connector on request
- Coating spray final protection.
- Stainless screws and nuts.
- HEAVY duty Aluminium IP56 box.
- Size 20x15 cm (feeder).
- Available as
- Assembled product with CONTROLLER - tested
- PCB
Controller:
- LED direction indicator. Picture - 2
- LED bar SWR indicator - power in the dummy load. Picture - 3
- High SWR protections - break PTT loop to PA + buzzer sound. Info
- PTT loop - Hot switch and high SWR protection.
- Segment switch by the external relay info
Parameters:
- 8 Directons based on K3LC design
- Designed for 100 Ohms! So Elements MUST have 50 Ohms in feed point
- Dump power insulation - better than -20dB (usually -30dB to -40dB)
- Input SWR - better than 1:1.3 (usually 1:1).
- LED bar indicarot lower indicated power around 5W.
- Power supply 13,8V to 15V. With option internal power supply also 230V 50Hz.
- Power supply current less than 600mA Frequently Asked Questionspan>
4SQ-8DIR system includes:
- RF box into the feed point Picture
- Controller.
- Total parcel weight about 6 kg.
- Dummy load is not included!!!.
- Internal Power Suppy 230V only
- Dummy load 50 Ohm
- Coax cable feeding lines 75 Ohm
Example of 160M HP version:
 160M NO ANT |
 160M dir NW |
 160M dir N |
Example of 80M HP version:
 80M for John ON4UN dir NW |
 80M for John ON4UN dir S |
 80M dir NOTRH |
 80M dir NE |
 80M NO ANT |
 80M dir NW |
Example of 40M HP version:
 40M for A44A: NO ANT |
 40M for A44A: dir SW |
 40M for A44A: dir W |
Download
| 4SQ-8DIR system | ||||
|---|---|---|---|---|
| Manual in WiKi | MANUAL | |||
| 4SQ-8DIR RF hybrid ver. 0.5 | sch  |
pcb  |
||
| CONTROLLER front panel ver. 0.3 | sch  |
pcb  |
||
| CONTROLLER conector PCB ver. 0.3 | sch  |
pcb  |
||
|
||||
|
We believe open source is a better way of doing things. View and download the Shield Schematic and PCB Kicad/Eagle CAD files, LibreCAD .DXF, or Inkscape .SVG files. The hardware designs are released under the Attribution-NonCommercial 2.0 Generic |
||||
