DX Engineering DXE-R4S-SYS-V3 Manual
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DX Engineering DXE-R4S-SYS-V3 Manual

Receive four square system
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Receive Four Square System
DXE-R4S-SYS-V3
U.S. Patent No. 7,423,588
DXE-R4S-SV3-INS rev.0
DXE-R4S-SYS-V3 Components Shown
© DX Engineering 2022
1200 Southeast Ave. - Tallmadge, OH 44278 USA
Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200
E-mail:
DXEngineering@DXEngineering.com

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Summary of Contents for DX Engineering DXE-R4S-SYS-V3

  • Page 1 Receive Four Square System DXE-R4S-SYS-V3 U.S. Patent No. 7,423,588 DXE-R4S-SV3-INS rev.0 DXE-R4S-SYS-V3 Components Shown © DX Engineering 2022 1200 Southeast Ave. - Tallmadge, OH 44278 USA Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200 E-mail: DXEngineering@DXEngineering.com...

  • Page 2: Table Of Contents

    Technical Support and Warranty Default Configuration Figures Figure 1 - Site Selection Clear Distance Figure 2 - Layout of the DXE-R4S-SYS-V3 Four Square System Figure 3 - Array Diagonal Dimension Figure 4 - Jumper Locations showing Default Settings Tables Table 1 - Array Safety Distance Minimums at 1500 watts...

  • Page 3: Introduction

     Low current DC powered control console allows system operation without AC power mains DXE-R4S-SYS-V3 (U.S. Patent No. 7,423,588) is the complete Receive Four Square Array Package which includes:  (1) DXE-RSEAV-4 Receive Short Element Active Vertical Antennas (4) w/ Internal Element Grounding Relays ...

  • Page 4: System Overview

    System Overview The DXE-R4S-SYS-V3 is an advanced four square receiving system that uses four symmetrically spaced elements to provide switching for a 4-direction receiving antenna system. This unique system uses time delay phasing rather than the single band phase shifting used in traditional four squares.

  • Page 5: Additional Parts Required

    A test array was constructed using DX Engineering Active Elements and a side length of only 35 feet. It showed excellent performance across a wide frequency range. This side length is optimal for 40 m, according to Table 2.
  • Page 6 Increasing the array size increases its sensitivity on the lower frequencies, sliding the performance curve toward the low frequencies and potentially eliminating the need for amplification.

  • Page 7: Site Selection

    Site Selection Site selection is important. The DXE-R4S-SYS-V3 system can be positioned as close as 1/10 wavelength to transmitting antennas. The DXE-RSEAV-4 Active Elements are bypassed to ground when power is turned off. A programmable sequencer, such as the optional DXE-TVSU-1B will be required with the DXE-R4S-SYS-V3, for an array located within 50 ft.

  • Page 8: Topographical Considerations

    60 feet Table 1 - Array Safety Distance Minimums at 1500 watts For any DX Engineering Receive Four Square, using the optional DXE-TVSU-1B Time Variable Sequencer Unit to sequence Active antenna power will ensure that transmitted energy will not cause damage to the receive system.

  • Page 9: Ground System

    Noise that limits the ability to hear a weak signal on the lower bands is generally a mixture of local ground wave and ionosphere propagated noise sources. Some installations suffer from a dominant noise source located close to the antennas. Noise level differences between urban and rural locations can be more than 30 dB during the daytime on 160 meters.

  • Page 10: Sizing The Array

    Consult lightning protection and station grounding information in the ARRL handbooks, or by referring to the NEC (National Electric Code). The DX Engineering website also has technical and product information listed under “Lightning Protection and Grounding.” Use lightning surge protectors for the coaxial cable feedline and control lines.

  • Page 11: Four Square Layout

     If you mount the RFS-3 on a wood post, it should be grounded to a separate ground rod Figure 2 - Layout of the DXE-R4S-SYS-V3 Four Square System System Operational Overview The DXE-R4S-SYS-V3 system is comprised of the DXE-EC-4 BCD Control Console and the DXE-RFS-3 Control Unit. These units interconnect and work together using factory default settings.

  • Page 12: Installation

    Seize must be used on all clamps, bolts and stainless steel threaded hardware to prevent galling and to ensure proper tightening. The DXE-RFS-3 is designed to be used with the DX Engineering Receive Short Element Active Vertical Antennas. It can also be used with passive elements for a dedicated mono-band array. The user manual included with the DXE-RSEAV active elements has instructions for assembly and installation.

  • Page 13: Active Antenna Feedlines

    If the resistance of the shield increases due to contamination, the active elements may not function properly. Any splices in the feedline should be high quality and entirely weather tight. Do not use splices in the delay line cables. The DXE-R4S-SYS-V3 system has been designed to use only 75 Ω coaxial cable.
  • Page 14 VF. The included DX Engineering DXE-RG6UFQ-1000 75 Ω quad shield coaxial cable has a nominal VF of 0.82. For best performance, the coaxial cable for the delay lines should be from the same batch or spool.

  • Page 15: Control And Power Connections

    DLY3 electrical length is 120.9 feet. Multiply 120.9 feet. by 0.82 (the VF of DX Engineering 75 Ω quad shield coaxial cable). The correct physical length for DLY3 is 99.14 feet, or 99 feet, 1-5/8 inches.
  • Page 16 Diagram 1 - Default Configuration. Control lines (usually BCD ) can normally use good quality CAT5e cable (4 twisted pairs of 24 AWG wire) for runs up to 1000 feet. Typical DX Engineering BCD control lines requirements are +12 VDC at 25 milliamps.

  • Page 17: Default Configuration

    (voltage drop with various wire gages) to ensure your power supply (normally +13.6 well filtered DC) will supply a minimum of +12 VDC, 40 milliamps at each active antenna (under load). A DX Engineering 4 Square or 8 Circle will require approximately 250 milliamps (only 4 actives are powered at any one time).

  • Page 18: Diagram 1 - Default Configuration

    Diagram 1 – Default Configuration for the DXE-R4S-SYS-V3 Shown with optional items. Accessory DC power cables omitted for clarity.

  • Page 19: Optimizing The Array

    Optimizing the Array To determine if the antenna system output level is the limiting factor, tune the receiver to the lowest band at the quietest operating time. This is usually when propagation is poor but some signals are heard. Disconnect the antenna and set the receiver to the narrowest selectivity you expect to use. Receiver noise power is directly proportional to receiver bandwidth (going from 2.5 kHz selectivity to 250 Hz selectivity reduces noise by 10 dB).

  • Page 20: Normal Receive Four Square Operation

    DX operations. Receive Four Square Troubleshooting There are several possible causes for a malfunction of a DX Engineering Receive Four Square System. Testing the system is not difficult and can be completed in an hour or so. Separate circuits for directional switching, Active Vertical Antenna power, and antenna phasing can each be affected by a variety of cabling, connection and or component problems.
  • Page 21 Start 80% of all Receive Four Square malfunctions are caused by Check Internal A, B or C Jumpers Animals, Chewed, Green Connector may have Punctured, Stretched broken a wire or is tightened Broken/Shorted or Broken. against insulation - not bare wire. Conductors Check all F connector center conductor...
  • Page 22 make proper contact. A properly installed F connector should have the center conductor protruding 1/4 inch beyond the shell when viewed from the side. Check all F connectors! C) Shorted or opened conductors caused by water migration into a control line or a feedline. Over 80% of all Receive Four Square malfunctions have been caused by the above system problems.
  • Page 23 4) If the EC-4 has only a couple LEDs lit with the control cable disconnected, then it may have sustained lightning pulse damage and will need to be repaired or replaced. A new DXE-EC-4 is available from DX Engineering. Continue troubleshooting the array control with a good EC-4 or by using a 1A fused power source.
  • Page 24 RFS unit may require service or replacement. At this point, the problem in your system should have been identified. If you need additional assistance from DX Engineering, feel free to call 330-572-3200 or e-mail (DXEngineering@DXEngineering.com). Detailed discussions of system function, connections, and troubleshooting is best handled by telephone, Monday through Friday, 8:30 am to 4:30 pm Eastern Time.

  • Page 25: Supplying Power Using The Feedline

    Appendix A Alternate Configurations – ONLY for distant arrays with very long feedlines and control cables, to minimize control and power cable conductor count An alternate configuration which uses the feedline coaxial cable for either the operational power or the directional control voltages, but not simultaneously, can be used. This configuration requires internal jumper changes in the DXE-RFS-3, along with additional hardware to couple the proper voltage to the feedline.

  • Page 26: Directional Control Using The Feedline

     Differential voltages (+/–12 Vdc & 12 Vac) using terminal C. This can be done using a 1 or 2 conductor cable. Economically priced COM-CW-4 is a 4 conductor control wire which may See Table 5 for the control matrix. The optional DXE-FVC-1 can be used to be used.

  • Page 27: Diagram 2 - Alternate Configuration

    Diagram 2 - Alternate Configuration All Element feedlines, delay lines and station feedlines must be 75 Ω coaxial cable. RFS-3 internal jumper changes are required. Element feedlines can be any length, but must be equal. Accessory DC power cables omitted for clarity.

  • Page 28: Diagram 3 - Alternate Configuration

    Diagram 3 - Alternate Configuration Using a manual switch connected to the optional DXE-FVC-1 for directional control All Element feedlines, delay lines and station feedlines must be 75 Ω coaxial cable. Requires RFS-3 internal jumper changes. Element feedlines can be any length, but must be equal. Accessory DC power cables omitted for clarity.

  • Page 29: Dxe-Rfs-3 And Active Element Power

    DXE-RFS-3 and Active Element Power The DXE-RFS-3 phasing unit uses and distributes the voltage to power the active antenna elements. For all four active elements, a nominal +12-15 Vdc at 200 mA current is required. The default configuration uses Terminal C on the 5-position plug for power. The DXE-EC-4 is used to power and control the DXE-RFS-3.

  • Page 30: Default Jumper Configuration Settings

    Internal Jumper Selection To access the DXE-RFS-3 jumper blocks, remove the 6 screws holding the connector plate of the DXE-RFS-3 unit to the enclosure. Pull on the plate to separate it from the enclosure. The jumper blocks should be visible and oriented as shown in Figure 5. Important Note: You cannot use coax or any other conductor for multiple functions.
  • Page 31 NOTES...
  • Page 32 All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a period of one (1) year from date of shipment. DX Engineering’s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted; no allowance shall be made for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by DX Engineering.

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