DX Engineering DXE-RFS-SYS-4S Manual Download Page 28 | Manualshive

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28

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. Power lines not shown for clarity.

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Summary of Contents for DXE-RFS-SYS-4S

Page 1: ...No 7 423 588 DXE RFS 4S INS Revision 0c DXE RFS SYS 4S Components Shown DX Engineering 2020 1200 Southeast Ave Tallmadge OH 44278 USA Phone 800 777 0703 Tech Support and International 330 572 3200 Fax...

Page 2: ...rnate Configuration 28 System Operational Overview 12 Diagram 3 Alternate Configuration 29 Installation 12 DXE RFS 3 and Active Element Power 30 Active Antenna Elements 13 Directional Control 30 Activ...

Page 3: ...ol console allows system operation without AC power mains DXE RFS SYS 4S U S Patent No 7 423 588 is a complete Receive Four Square Array Package which includes 1 DXE ARAV4 4P Active Receive Vertical A...

Page 4: ...Features Advantages of the DXE RFS SYS 4S Receive Four Square Antenna System over other receiving arrays include Seamless stainless steel RFS 3 enclosure for enhanced weather resistance Reduced suscep...

Page 5: ...receiving system limits on external noise antenna directivity F R is the only thing that affects the signal to noise ratio An average Beverage antenna exhibits about 6 dB gain You would need two rever...

Page 6: ...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: ...is to do the best you can by balancing all the factors The minimum distance to any transmitting antenna from the Four Square perimeter is 1 10 wavelength Greater than 1 2 wavelength is the minimum di...

Page 8: ...s It s recommended the ground height difference between any element in the array be less than 10 of the array diameter For example a 60 foot diameter array should be within six feet of level Every eff...

Page 9: ...a 3 4 or larger rigid copper water pipe although conventional copper coated steel rods may also work Depending on soil conductivity you can expect better performance with multiple ground rods spaced a...

Page 10: ...longer than the optimal 98 feet shown for 160m and 80m This will improve 160m performance reduce sensitivity on 80m somewhat but less than sizing the array exactly for 160m Band Freq MHz Optimal Side...

Page 11: ...ure side to side and then corner to corner to ensure the element locations are square Normally the RFS 3 phasing unit is installed near the center of the four array elements above any standing water w...

Page 12: ...re to couple the proper voltage to the feedline For directional control through the feedline the DXE RFS 3 requires 12 Vdc 12 Vdc and 12 Vac The DXE FVC 1 Voltage Coupler can be used to supply these v...

Page 13: ...tive Elements and DXE EC 4 Controller so you understand their operation before proceeding Station Feedline Active Antenna Feedline and Delay Lines The weakest link in an antenna system such as the DXE...

Page 14: ...ptional performance for single or dual band operation where high dynamic range is required The DXE RFS 3 phasing unit has three sets of delay line connections marked DLY1 DLY2 and DLY3 Each of these c...

Page 15: ...DLY3 Next multiply the DLY3 electrical length by the VF of the delay line coaxial cable The result is the correct physical length for DLY3 Figure 4 Array Diagonal Dimension For Example An array with 9...

Page 16: ...XE RFS 3 It is labeled G A B C G The DXE RFS 3 uses a two part green connector and the top part can be removed by pulling it straight off This will allow easier wire replacement or servicing as needed...

Page 17: ...Active antenna circuitry needs a good voltage supply to operate properly When supplying power to an active antenna you want to have 12 VDC 60 milliamps at each active under load CAT5e cable is not rec...

Page 18: ...wn in the diagram to the right position one favors the NE direction position 2 favors the SE direction position 3 favors the SW direction and position 4 favors the NW direction when the array is posit...

Page 19: ...19 Diagram 1 Default Configuration for the DXE RFS SYS 4S Shown with optional items Power connections not shown for clarity...

Page 20: ...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 2 HF Preamplifier has better dynami...

Page 21: ...nto modern 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 superi...

Page 22: ...s 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 incl...

Page 23: ...its 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 th...

Page 24: ...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...

Page 25: ...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 t...

Page 26: ...nfiguration requires changing the internal jumpers from their default settings Be very careful about changing the default jumper settings You must not jumper the DXE RFS 3 so that power and directiona...

Page 27: ...edline for directional control then you must provide power for the DXE RFS 3 using terminal C of the J12 connector Terminals A B are not used A single conductor cable is needed to power the DXE RFS 3...

Page 28: ...onfiguration All Element feedlines delay lines and station feedlines must be 75 coaxial cable RFS 3 internal jumper changes are required Element feedlines can be any length but must be equal Power lin...

Page 29: ...ected to the optional DXE FVC 1 for directional control All Element feedlines delay lines and station feedlines must be 75 coaxial cable Requires RFS 3 internal jumper changes Element feedlines can be...

Page 30: ...uses a 2 bit 12 Vdc BCD interface scheme to switch directions through a user supplied 4 conductor cable connected to the DXE EC 4 The default direction without applied control voltage is in the direc...

Page 31: ...f 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 Coa...

Page 32: ...allation 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 outs...

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