DX Engineering DXE-RCA8CB-SYS-4P Manual Download Page 31 | Manualshive

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Summary of Contents for DXE-RCA8CB-SYS-4P

Page 1: ...E RCA8CB SYS 4P U S Patent No 7 423 588 DXE RCA8C SYS 4P INS Revision 0b DX Engineering 2018 1200 Southeast Ave Tallmadge OH 44278 USA Phone 800 777 0703 Tech Support and International 330 572 3200 Fa...

Page 2: ...10 Vertical Element Feedlines 11 Typical DXE RCA8C SYS 4P Receive Eight Circle Configuration 12 Delay Line 13 Optimizing the Array 13 Theory of Operation of the Receive Eight Circle Array 14 System D...

Page 3: ...tter signal to noise ratio Reduced susceptibility to high angle signals compared to phased Beverage antennas as well as superior performance over EWE Flag Pennant K9AY antennas Switching console selec...

Page 4: ...mpression Tool for 75 coaxial cable connectors DXE SNS6 25 Package of 25 Snap N Seal Connectors for 75 F6 coaxial cable Additional Parts Required Not Supplied with the DXE RCA8C SYS 4P One additional...

Page 5: ...troller eight DXE AVA2 Active Matching Units for your vertical elements and one Delay Cable with F Connectors installed These units interconnect and work together using factory default settings to con...

Page 6: ...ontroller unit should be mounted as shown in Figure 3 with cover upward and the control and coaxial cable connections downward to prevent water from entering the box The stainless steel base of the Re...

Page 7: ...connections are labeled G A B C D The terminals use the same connection letters and are connected G to G A to A B to B C to C and D to D On the RCA8C 1 the green connector is a two part connector as s...

Page 8: ...ol Line Lengths Minimum Copper Wire Gage AWG Length 24 1 000 feet 22 1 500 feet 20 2 000 feet Active antenna circuitry needs a good voltage supply to operate properly When supplying power to an active...

Page 9: ...mitting antennas 1 10 wavelength of the lowest transmitting frequency This is possible provided the active units are powered off at least 5 ms before transmitting An optional sequencer such as the DXE...

Page 10: ...s than 5 8 OD A good ground system improves the array performance and enhances lightning survivability It is important that the ground system is identical for each active antenna in the array You can...

Page 11: ...use 75 feedline to the operating position from the DXE RCA8C 1 unit Do not use amplifiers combiners filters or splitters that are not optimized for 75 systems All element feedlines must be 75 and can...

Page 12: ...the chassis mounting nut allowing the connector body to rotate and fracture the mounting tabs on either installation or removal of the connector F connectors require modest torque typically 6 12 inch...

Page 13: ...Figure 8 Coaxial Cables are shown in various colors for clarity Shown with optional DXE RPA Receive Pre Amplifier DXE RFCC Receive Feedline Current Choke and optional DXE CW9S Control Cable Power con...

Page 14: ...na 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...

Page 15: ...s a clean stable pattern with high directivity over wide bandwidth W8JI initially developed and used this array in the 1980 s This array started appearing in the 1990 s at larger more advanced low ban...

Page 16: ...broadband active elements this array has unbeatable performance across a single band The Eight Circle Array upper frequency limit for a clean unidirectional pattern is slightly above where the array i...

Page 17: ...rimary benefit Antenna gain is a secondary advantage As frequency increases the fixed array size becomes electrically larger in terms of wavelength The increased electrical spacing produces higher sen...

Page 18: ...uctors regardless of element design for a given style of element The effect on pattern depends almost entirely on how much surrounding objects absorb and re radiate signals if the undesired structure...

Page 19: ...mity to Transmitting Antennas The AVA2 Active Matching Units with customer supplied vertical elements or the DXE ARAV4 8P Receive Antenna Active Vertical with Relay active elements and your transmitti...

Page 20: ...of 327 wavelength This pattern achieves the best Receiving Directivity Factor RDF which is a figure that compares the forward lobe gain to the average gain of the antenna array in all directions inclu...

Page 21: ...lowable side lobe levels as represented closely to the pattern 35 wavelength radius shown in Figure 9 For example an array built to cover 160 80 and 40 meters has a highest frequency of 7 3 MHz and a...

Page 22: ...atterns in Figure 10 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: ...are using you must directly measure the electrical length of the coaxial cable you have with an analyzer or obtain cable with a known VF Table 3 shows delay line length calculations based on the dimen...

Page 24: ...imensions rather than operating frequency which allows 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 nu...

Page 25: ...e Array is sized by multiplying the free space wavelength at 1 832 MHz of 537 feet wavelength times the optimum pattern circle radius of 0 327 wavelength which yields an optimal circle radius of 175 6...

Page 26: ...2 26 66 13 172 8 345 6 319 3 0 604 3 500 70 29 35 14 91 8 183 7 169 7 0 604 3 650 67 40 33 70 88 1 176 1 162 7 0 604 3 800 80M only or 160 80M 64 74 32 37 84 58 169 2 156 3 0 604 7 200 40M only 34 17...

Page 27: ...e pulled inward C Shorted Open conductors due to water Check feedlines and control cable D Zapped by lightning pulse or RF overload Make sure units are at least 1 2 wavelength on the lowest frequency...

Page 28: ...Active antennas and any transmit antennas If that distance is less and high power is used then the Time Variable Sequence Unit TVSU must be used to interrupt power to the AVA2 units 2 Damaged Receive...

Page 29: ...s disconnected from the Receive Eight Circle System relay unit If measured voltages are not between 10 to 18 Vdc on the selected line a resistive short or open circuit problem exists in the control li...

Page 30: ...of that antenna may not be receiving power Retest for DC power at the antenna end of that feedline If 10 to 18 Vdc is found then the Active unit may need to be serviced or replaced New AVA2 units are...

Page 31: ...31 NOTES...

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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