DX Engineering DXE-RCA8B-SYS-2P Manual Download Page 1

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Receive Eight Circle

Controller and Switch Package

DXE-RCA8B-SYS-2P

DXE-RCA8B-SYS-2P-INS Revision 3

1200 Southeast Ave. - Tallmadge, OH 44278 USA

Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200

Fax: (330) 572-3279 ∙ E-mail: [email protected]

Summary of Contents for DXE-RCA8B-SYS-2P

Page 1: ...ch Package DXE RCA8B SYS 2P DXE RCA8B SYS 2P INS Revision 3 DX Engineering 2013 1200 Southeast Ave Tallmadge OH 44278 USA Phone 800 777 0703 Tech Support and International 330 572 3200 Fax 330 572 327...

Page 2: ...e Antenna Feedline and Delay Line 11 Vertical Element Feedlines 12 Delay Line 12 Lightning Protection 13 Optimizing the Array 14 Theory of Operation of the Eight Circle Array 14 System Design Features...

Page 3: ...varies with circle radius Can be built with passive verticals to cover any single band Excellent directivity in a smaller space than phased Beverages for better signal to noise ratio Reduced susceptib...

Page 4: ...G6 F6 75 Coaxial Cable w extra blade DXE SNS CT1 Snap N Seal Crimp Tool for 75 coaxial cable DXE SNS6 25 Package of 25 Snap N Seal Connectors for 75 F6 coaxial cable Five Conductor Power and Control C...

Page 5: ...fault settings to control the Receive Eight Circle Array The modified CC 8A control console uses BCD switching voltages for the RCA8B 1 to change the receiving direction of the array When the modified...

Page 6: ...turdy wooden post if provision for grounding the RCA8B 1 unit has been made Note UMI 81343 Never Seez or DXE NSBT8 Anti Seize should be used on all clamps bolts and stainless steel threaded hardware t...

Page 7: ...as shown in Figure 4 3 The same five wires are connected to the RCA8B 1 removable green connector G A B C D as shown in Figure 5 D is required only for voltage on the element feedlines and should not...

Page 8: ...n the feedlines of mono band passive vertical elements do not connect a voltage source to the D terminal on the RCA8B 1 connector Switch Position G A B C D 1 GND 0 0 0 1 2 GND 1 0 0 1 3 GND 0 1 0 1 4...

Page 9: ...t that the ground radial system is identical on each vertical element in the array Extensive details on the construction of the required passive elements are contained in ON4UN s Low Band Dxing by Joh...

Page 10: ...gh adequate performance generally occurs with much smaller spacing with one half wavelength minimum recommended Typical DXE RCA8B SYS 2P Receive Eight Circle Configuration Figure 6 Coaxial Cables are...

Page 11: ...nough for the entire array plus spares Snap N Seal connectors cannot be installed with normal crimping tools or pliers The DXE SNS CT1 Compression Tool for Snap N Seal 75 Coax Connectors is an essenti...

Page 12: ...frequency allowing for the use of a single delay line for optimum directivity over a very wide frequency range This results in phase being correct for a rearward null at any frequency The DXE RCA8B 1...

Page 13: ...830 MHz 175 64 134 43 127 71 108 55 80 meters only 3 800 MHz 84 58 64 74 61 50 52 28 40 meters only 7 200 MHz 44 66 34 17 32 46 27 59 Table 2 Specific Delay Line Length Calculations for single band a...

Page 14: ...with high dynamic range should be used to compensate for the low signal level Using a pre amplifier when sufficient signal is already present may result in amplification of the noise along with the si...

Page 15: ...w currents This is because of the large surface areas and hard contact materials necessary to support high contact switching currents The RCA8B 1 Receive Eight Circle Array Controller uses sealed rela...

Page 16: ...s are slightly above receiver noise floor signal to noise ratio is almost entirely a function of antenna pattern System loss or system gain is no longer a factor and excessive gain can actually hurt r...

Page 17: ...levels of the multiple path single source signal will vary a great deal This will cause undesirable fading and distortion We cannot successfully directly mix multiple antennas for diversity reception...

Page 18: ...sures the array is looking away from the source of noise when beaming in the primary listening direction The second best location for the array is when the noise source is as far as possible from eith...

Page 19: ...uencer Unit is used With 1500 watts output and a unity gain 0 dB antenna the closest active element can be 1 10 wavelength from the transmitting antenna at the lowest transmitting frequency Doubling t...

Page 20: ...would be two Eight Circle Arrays one optimized for 80 meters built inside of the other optimized for 160 meters Each is optimally sized for a 327 wavelength radius according to the dimensions in Tabl...

Page 21: ...y 375 wavelength radius for 40 meters just about the same as the 2 wavelength radius pattern on 80 meters and the 1 wavelength radius pattern for 160 meters An array sized for the highest frequency of...

Page 22: ...patterns in Figure 9 were generated using EZNEC and show the effects on the patterns when varying the radius of the array These patterns are not to be viewed as pointing in a default or particular dir...

Page 23: ...Eight Circle Array must be installed with Active Vertical elements An Eight Circle Array that is optimized for a certain band will not yield useful results on the next higher frequency band If you ar...

Page 24: ...22 5 degrees 0 383 Diameters of Circles feet Diameter Endfire Spacing Broadside Spacing form a triangle Broadside Spacing as a of WL 1 800 136 67 68 33 178 6 357 1 329 9 0 604 1 825 134 79 67 40 176 1...

Page 25: ...em that was previously functioning properly START 80 of all Receive Eight Circle malfunctions are caused by A B or C A Broken Shorted Conductors Animals Chewed Punctured Stretched or Broken Green Conn...

Page 26: ...t Circle malfunctions have been caused by the above system problems A thorough inspection and subsequent testing of each control cable RF cable and their respective connections will uncover the cause...

Page 27: ...tions A B C and D reference to the ground pin G as shown below The selected position will supply the BCD logic voltage as shown in the chart below Switch Position G A B C D 1 GND 0 0 0 1 2 GND 1 0 0 1...

Page 28: ...nductor s to select one direction of Receive Eight Circle System unit operation Simultaneously feed normal operating voltage on the tested conductor that powers the Active Verticals for reception If a...

Page 29: ...System 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 or write Det...

Page 30: ...ight F Connectors qty 25 pcs DXE SNS CT1 SNS Connector Compression Tool CNL 911 Coaxial Cable Shears DXE CIT 1 F Connector Tightening Tool UMI 81343 DXE NSBT8 Anti Seize Never Seez An Anti seize compo...

Page 31: ...ielding plus a solid tinned copper drain wire providing a total of 9 conductors for DC switching applications It has a polyethylene jacket and is rated for direct burial A nice feature is the rip cord...

Page 32: ...accident rendered defective by reason of improper installation damaged from severe weather including floods or abnormal environmental conditions such as prolonged exposure to corrosives or power surg...

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