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9 

Active Antenna Elements 

 

If you are planning to use the array on 160m, a jumper in all of the 

AVA2 

Active Matching units 

should be changed. Placing a jumper on L1MF will peak the array sensitivity response for use on 
160m, with little effect on 80m. When doing this the sensitivity for the AM broadcast band will be 
reduced. All four 

AVA2 

Active Matching units in the array must have identical jumper settings. 

 

For access to the jumpers in the 

AVA2 

Active Matching units, remove the 2 screws on each side of 

the case and remove the bottom. The circuit board and jumper headers will be visible as shown in 

Figure 3

. By default, there are no jumpers across any pins. Place a jumper across 

L1MF

. Do not 

jumper any other positions. See the 

DXE-ARAV3-1P

 Receive Antenna Active Vertical w/Relay  

User Manual for more information about additional peak response jumper settings. 
 
 
 
 
 
 
 
 

Figure 3 - Active Element L1MF Jumper Locations

 

 

Station Feedline, Active Antenna Feedline and Delay Lines 

 

The weakest link in an antenna system, such as the 

DXE-RFS-SYS-3P

, is often the coaxial cable 

connections. All connections must be high quality and weather tight to prevent contamination and 
corrosion, which can cause the feedline impedance to change. 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 recommended) in the feedline should be high quality and 
entirely weather tight. The 

DXE-RFS-3P

 system has been designed to use only 75 Ω coaxial cable. 

 

High quality, flooded 75 Ω CATV F6 type coaxial cable is recommended and is available from DX 
Engineering. 

DXE-F6-1000

 Flooded coaxial cables automatically seal small accidental cuts or 

lacerations in the jacket. Flooded coaxial cable also prevents shield contamination and can be 
direct-buried.  

 

DX Engineering offers an inexpensive preparation tool, part number 

DXE-CPT-659,

 that readies 

the coaxial cable for connectors in one operation and comes with an extra cutting cartridge. To 
ensure weather tight connections, use

 DXE-SNS6-25 

Snap-N-Seal compression style connectors. 

DXE-SNS6-25

 contains 25 Snap-N-Seal connectors, enough for the entire array plus some spares. 

The Snap-N-Seal connectors cannot be installed with normal crimping tools or pliers, so you must 
use an installation tool like the 

DXE-SNS-CT1

, available from DX Engineering, for proper 

connector installation. 

 

Содержание DXE-RFS-SYS-3P

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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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