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DX Engineering DXE-RFS-SYS-3P, Manual

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3 

 

Directivity over a very wide frequency range when using DX Engineering Active Matching 
unit equipped vertical elements 

 

Less physical space and maintenance required than a Beverage antenna and active elements 
need only a minimal ground system  

 

Enhanced relay contact reliability 

 

Low current DC powered control console allows system operation without AC power mains 

This system uses a 70 foot square layout which provides excellent directivity and high front to back 
ratio for best signal to noise ratio and reduction of interference from undesired directions across the 
160, 80 and 40 meter bands.  
 

 

Failure to make quality feedline or delay line connections might result in an array 

that does not work or performs poorly. 

 

 
For a turnkey package including the active antennas, 1000 ft of F6 direct burial flooded cable, 
connectors, tools and the 

DXE-TVSU-1B

 Time Variable Sequencer Unit, see the 

DXE-RFS-SYS-

4P

 Complete System Package. 

 

Additional Parts Required, Not Supplied with the DXE-RFS-SYS-3P 

 
Four identical vertical antenna elements. This may consist of four vertical antennas, each 8-24 feet 
tall, with an accompanying radial system, or four 102" vertical whip elements such as the 

DXE-

WP-102

. 

 
Four-Conductor Power and Control Cable for RFS-3 

Four conductor cable (3 plus ground), 22 gauge minimum. Economically priced 

COM-CW-4

 

is

 a four conductor control wire which may be used.

 

               

 

75 Ω Coaxial Cable, with F Connectors 

When calculating cable length, include connections from the phasing unit to each active 
matching unit element, plus the distance to the operating position. You must use 75 Ω coaxial 
cable with a known velocity factor (VF) for all connections.  
 
We recommend using a high quality, 75 Ω “flooded” F6 type coaxial cable, such as 
DX Engineering part number 

DXE-F6-1000

. Flooded-style cables automatically seal small 

accidental cuts or lacerations in the cable jacket. Flooded cables also prevent shield 
contamination and can be direct-buried.  
 

Note

:  The 

DXE-CPT-659

  stripping tool prepares F6 style cable for connectors in one 

easy and clean operation and comes with an extra cutting cartridge. 

 

Feedline connections must have good integrity and be weather resistant. We recommend  
cable assemblies with Snap-N-Seal type F connectors. The complete 

DXE-RFS-SYS-3P

 

system, including feedline connections, requires sixteen type F connectors. 

DXE-SNS6-25

 

contains 25 Snap-N-Seal F connectors, enough for the entire array plus spare connectors. The 

Summary of Contents for DXE-RFS-SYS-3P

Page 1: ...DXE RFS SYS 3P U S Patent No 7 423 588 DXE RFS SYS 3P INS Revision 2a DX Engineering 2017 1200 Southeast Ave Tallmadge OH 44278 USA Phone 800 777 0703 Tech Support and International 330 572 3200 Fax 330 572 3279 E mail DXEngineering DXEngineering com ...

Page 2: ...d combining for stable broadband performance The DXE RFS SYS 3P is a sophisticated receiving system that is designed to be used with four identical vertical symmetrically spaced elements to provide switching for a 4 direction receiving antenna system The system uses time delay phasing rather than the conventional narrow band frequency dependent phasing systems The time delay phasing is directivity...

Page 3: ...nying radial system or four 102 vertical whip elements such as the DXE WP 102 Four Conductor Power and Control Cable for RFS 3 Four conductor cable 3 plus ground 22 gauge minimum Economically priced COM CW 4 is a four conductor control wire which may be used 75 Ω Coaxial Cable with F Connectors When calculating cable length include connections from the phasing unit to each active matching unit ele...

Page 4: ... selectivity and you still would be limited to one or two bands The DXE RFS SYS 3P system occupies far less space is much easier to install and maintain is less conspicuous and operates over a wider frequency range with similar or better performance Note The DXE RFS SYS 3P Receiving system must be separated from transmitting or other antennas and structures particularly metal by at least 1 2 wavel...

Page 5: ...may vary according to location and proximity to various objects For example transmitting legal limit power output 1500 watts into an ideal transmitting four square array produces about 6 000 watts ERP 6 dB gain Because of the increased radiated power level nearly 1 2 wavelength minimum spacing between the transmitting and receiving antenna arrays is required even when using the DXE TVSU 1B Time Va...

Page 6: ... signal direction azimuth and elevation and average gain in the direction of noise If noise predominantly arrives from the direction and angle of desired signals assuming polarization of signals and noise are the same there will be no improvement in the signal to noise ratio If the noise originates in the near field of the antenna everything becomes unpredictable This is a good case for placing re...

Page 7: ...nal receiving performance 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 feedline and control lines Four Square Layout The four array antenna eleme...

Page 8: ...rray The DXE EC 4 needs a 12 Vdc well filtered 1A fused power input The DXE RFS 3 distributes the operating power to the active elements through the individual element feedlines The active elements do not work without power Cutting power to the DXE RFS 3 also cuts power to the active elements which causes the AVA2 to ground the vertical element Installation The DXE RFS 3 Control Unit can be mounte...

Page 9: ...e This can affect the signal to noise ratio and the directivity of the array The DXE RFS 3 may use the shield as a ground return path for the active element power Note The total loop resistance of the ground path must be under 30 Ω for reliable operation If the resistance of the shield increases due to contamination the active elements may not function properly Any splices splices are not recommen...

Page 10: ...ing of 70 feet their electrical length is critical and careful measurements were made when manufacturing these delay lines using high quality 75 Ω coaxial cable with a known Velocity Factor VF which is a very important factor To avoid performance degradation due to inconsistent coaxial cable construction all three of the delay line coaxial cable assemblies are manufactured from the same spool Dela...

Page 11: ...A 2 to B 3 to C Wire connections between the DXE EC 4 and DXE RFS 3 The switch position on the DXE EC 4 controls the directivity of the received signal in the DXE RFS SYS 3P Position 1 favors the NE position 2 favors the SE position 3 favors the SW and position 4 favors the NW when the array is positioned as shown ...

Page 12: ...erly When supplying power to an active antenna you want to have 12 VDC 60 milliamps at each active under load CAT5e cable is not recommended when making long runs to power an active antenna since the line loss in CAT5e cable may not supply the proper operational voltages required for active antennas Depending on the required length of your power wire you will want to use a line loss calculator vol...

Page 13: ...13 DXE RFS SYS 3P Connection Diagram Shown with optional DXE RFCC 1 Feedline Current Choke Control Cable Coaxial Cables and Customer supplied vertical antenna elements ...

Page 14: ...n Settings Figure 5 shows the default mandatory jumper settings for the DXE RFS 3 For JMP1 JMP2 the center and top pins of both are shorted For JMP3 JMP4 the center and bottom pins of both are shorted Figure 5 Jumper Locations showing Default Settings JMP1 Selects Power Voltage Source Coax or J12 Shown in default position voltage from J12 JMP2 Selects Direction Voltage Source Coax or J12 Shown in ...

Page 15: ...e the least gain possible Depending on conditions a preamplifier can cause receiver overload this may require an attenuator or bypassing the preamplifier The DXE RPA 1 HF Preamplifier has better dynamic range than most receivers and can be used to compensate for the decrease in array signal output The DXE RPA 1 preamplifier is automatically bypassed when power is removed Front to Rear Null Optimiz...

Page 16: ...rn transceivers The Receive Four Square array pattern is designed to enhance forward low angle signals and reject rearward and high angle signals The Receive Four Square system provides superior signal to noise results that allow you to hear signals that are impossible to copy on much noisier transmit antennas for greatly improved weak signal DX operations Receive Four Square Troubleshooting There...

Page 17: ...es on the units and the urine will corrode and damage electronics Insects getting inside units and shorting out electronics A Broken and or shorted conductors due to animal weather or other damage including chewed punctured stretched and broken control and power lines and or feedlines for the system and each antenna Also screws in the green removable connectors can inadvertently be tightened onto ...

Page 18: ...as if they were trees The above items are the most common failure points in the system that need to be checked If necessary the following further troubleshooting procedure may assist in finding the malfunction Receive Four Square Control Troubleshooting Procedure 1 Test the DXE EC 4 BCD Control Console unit which should be connected only to the control lines of the Receive Four Square System When ...

Page 19: ...Antennas by feeding a voltage on the tested control line A and or B conductor s to select one direction of RFS unit operation Simultaneously feed normal operating voltage on the tested conductor that powers the Active Verticals for reception If a low value fuse blows then a short circuit may be isolated by disconnecting antennas and reconnecting them one at a time If no fuses have blown and connec...

Page 20: ... antenna end of that feedline If 10 to 18 Vdc is found then the Active unit may need to be serviced or replaced New DXE AVA 2 units are available separately by calling DX Engineering 10 If all Active Verticals tested provide the same signal level then change switching voltages to activate the other ports one at a time and test each RFS unit port using one of the good antennas testing for the same ...

Page 21: ...pylene Aluminum Laminated Tape with overlap Bonded to the Dielectric Nominal Diameter Over Tape 0 187 in 2nd Shield 34 AWG Aluminum Braid Wire 60 Coverage Jacket PE Flooded for Underground Nominal Diameter Over Jacket 0 272 in Nominal Jacket Thickness 0 030 in Electrical Properties Impedance 75 0 3 0 Ωs Velocity of Propagation 85 0 Nominal We recommend the use of Snap N Seal connectors to ensure a...

Page 22: ...s with bent coax Only finger force is required Provides enough leverage to achieve a 30 in lb tightening force by hand Helps insure proper connections thereby reducing the potential of loose connector related service calls JTL 12555 Jet Lube SS 30 Pure Copper Anti Seize Jet Lube SS 30 Pure Copper Anti Seize is the top choice of engineers and technicians in government industry and leading Amateur R...

Page 23: ...ption a Feedline Current Choke is recommended if your SWR is already low Adding a DX Engineering Feedline Current Choke at the point where the feedline exits the area of the antenna will substantially reduce unwanted feedline radiation or reception without the need for improved station grounding The advantages of using an FCC Prevents unwanted RFI by eliminating feedline current and radiation All ...

Page 24: ...tallation damaged from severe weather including floods or abnormal environmental conditions such as prolonged exposure to corrosives or power surges or by the performance of repairs or alterations outside of our plant and shall not apply to any goods or parts thereof furnished by Buyer or acquired from others at Buyer s specifications In addition DX Engineering s warranties do not extend to other ...

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