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Shively Labs 6842 Instruction Manual Installation, Operation, & Maintenance

Circularly polarized fm broadcast antenna
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Circularly Polarized FM
Broadcast Antenna
Model 6842
Instruction Manual
Installation, Operation, &
Maintenance

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Summary of Contents for Shively Labs 6842

  • Page 1 Circularly Polarized FM Broadcast Antenna Model 6842 Instruction Manual Installation, Operation, & Maintenance...
  • Page 2 Congratulations! Thank you for purchasing one of the finest FM broadcast antennas on the market today. The Shively Labs 6842 is the top-of-the-line in its class for its simplicity, superior performance and durability. Your purchase is backed by the best technical support in the industry. Shively is a leading manufacturer in the broadcast industry, providing an extensive range of antennas, transmission line and components.
  • Page 3 IMPORTANT Please read this manual in its entirety before beginning installation of your antenna! Failure to follow the installation and operation instructions in this manual could lead to failure of your equipment and might even void your warranty!

  • Page 5: Table Of Contents

    Table of Contents Chapter 1 Preparation ................ 1 Check the shipment................1 Torque specifications................1 Table 1 Torque specifications ............1 Check the parts..................1 Set up the mounting pole..............1 Figure 1 Tower layout, single-bay antenna ........3 Figure 2 Tower layout, two-bay antenna ..........
  • Page 6 Bay components ................. 41 Table 4 Components, 6842 bay without de-icers (per antenna bay) 41 Table 5 Components, 6842 bay with de-icers (per antenna bay) ..41 Figure 22 Components, 6842 bay without endseal radome ....42 Table 6 Kit, endseal radome (per antenna bay) ......42 Figure 23 Endseal radome components..........
  • Page 7 Appendix A Selected Assembly Drawings ........51 Figure 1 22° Feed Strap with Endseal Radome & Deicer ....52 Figure 2 6842 Exploded View with Endseal Radome ......53 Figure 3 Bay Arm Stickers ............. 54 Figure 4 Power Divider Mount Detail ..........55...

  • Page 9: Table Of Contents Chapter 1 Preparation

    Preparation Preparation Check the shipment. As soon as you receive your antenna, BEFORE signing for the shipment: a. Check to be sure all the material has arrived. b. Check for evident damage to any of the boxes. c. If any boxes are missing, or if any are obviously damaged, describe the problem in a WRITTEN note on the shipping papers BEFORE signing them.
  • Page 10 Preparation CAUTION Before attaching the pole mounts to the tower, scrape away tower paint to ensure good electrical contact. If you don’t, the antenna may gener- ate unwanted electrical signals, and performance may be degraded. a. Set up a outrigged round pole or pipe, 3" to 5-1/4" in diameter, 15" from the tower face or leg.
  • Page 11 Preparation Figure 1. Tower layout, single- bay antenna...
  • Page 12 Preparation Figure 2. Tower layout, two-bay antenna...
  • Page 13 Preparation Figure 3. Tower layout, three- bay antenna...
  • Page 14 Preparation Figure 4. Tower layout, four-bay antenna...
  • Page 15 Preparation Figure 5. Tower layout, five-bay antenna...
  • Page 16 Preparation Figure 6. Tower layout, six-bay antenna...
  • Page 17 Preparation Figure 7. Tower layout, eight-bay antenna...
  • Page 18 Preparation Figure 8. Top mounted installation...

  • Page 19: Chapter 2 Bay Assembly

    Bay Assembly Bay Assembly Attach the bay arms [for single bay antennas and 1/2-wave-spaced antennas only] (antennas without  a. Using 1/4-20 x 1-3/4" hardware (Figure 9a, 2, 3, and 4), attach the four innermost antenna arms (5) to the pair of holes on the boom (1) mounting de-icers).

  • Page 20: Attach The Bay Arms (Antennas With De-Icers)

    Bay Assembly Attach the bay arms The bay de-icer pigtail is shipped pre-assembled. Handle the de-icer compo- nents carefully to prevent damaging them when assembling the bay. (antennas with de- CAUTION icers). When installing the screws securing the arms to the stubs (Figure 9c), be very careful not to damage the bay de-icer heater (15) and pigtail...
  • Page 21 Bay Assembly Figure 10. Attaching the feedstrap NOTE Only antennas without radomes and 1/2-wave- spaced antennas require this additional twist step.

  • Page 23: Chapter 3 Endseal Radome Installation

    Endseal Radome Installation Endseal Radome Installation Install the radome. a. Using 1/4-20 x 2-1/4" hardware (Figure & 18, assemble the radome support disc halves & 20) around the base and up against the shoulder of the endseal. b. Using 1/4-20 x 1" hardware (21, &...
  • Page 24 Endseal Radome Installation c. Aligning its side slots with the notches in the fillers, slip the radome (24) over the fillers and onto the support disc. Secure it in place using the 1/4-20 x 3/4" hardware (25, & 18). d. Seal the gaps around the fillers, using a room-temperature-vulcanizing (RTV) compound.

  • Page 25: Chapter 4 Mounting The Antenna Bay(S)

    Align the bays to the correct azimuth and vertically with each other, then tighten the mounting hardware to 37 ft-lb. NOTE The Model 6842 does not require pressurization or purging. The feed system up to the bays may be pressurized. Please proceed to...

  • Page 27: Chapter 5 Installing The De-Icer System (If Applicable)

    Remember that conditions may be favorable for icing on the tower, even if they are not on the ground. Shively Labs deicers are designed to prevent ice from forming on antenna ele- ments and are not designed to melt ice that has already formed. For this rea-...
  • Page 28 Installing the De-icer System (if applicable) Figure 13. De-icer electrical schematic diagram NOTE Customer-supplied items are shown in broken lines. NOTE A liquid-tight conduit con- nector (3/8" conduit size by 1/2" hub size) for the harness entry tower junction box, is packed loose with the de- icer harness.

  • Page 29: De-Icer Installation

    We recommend mounting it as close as practical to the antenna. (if applicable) CAUTION Shively Labs's de-icer control box, Model 94068, is designed for interior installation only. CAUTION When testing the thermostat, be sure to have one or both thermostat leads disconnected before taking resistance readings.
  • Page 30 Installing the De-icer System (if applicable) Figure 14. Bay junction box installation NOTE Wire nuts, cover with screws, and gaskets, and tie-wraps provided with the de-icer cable harness.
  • Page 31 Installing the De-icer System (if applicable) Table 3. Thermostat readings Reading Ambient Resistance = Resistance = Location Temperature 0 ohms infinite ohms (short circuit) (open circuit) Leg-to- Defective thermo- Ground stat or shorted leads Leg-to-Leg Above about 38° Defective thermo- F(3.3°...

  • Page 33: Chapter 6 Connecting The Antenna (Single-Bay)

    Connecting the Antenna (single-bay) Connecting the Antenna (single-bay) Connect the antenna a. Provide a gas stop between the tower transmission line and the antenna input if necessary. The antenna bay is not pressurized. The feed system up bay. to the bay may be pressurized. CAUTION All O-rings are made of silicone.
  • Page 34 NOTE The Model 6842 bay does not require pressurization or purging. Installation of your Model 6842 single-bay is now complete. Please proceed to Startup on page 35.

  • Page 35: Table Of Contents Chapter 7 Connecting The Antenna (2-Bay)

    Secure the cables to the mounting pole or tower leg, using tie-wraps (28) or customer-supplied cable clamps. Install the optional One of the unique features of Shively Labs antenna systems is the adjustable impedance-matching transformer (Figure 20, 57) available with the antenna.

  • Page 36: Connect The Tower Transmission Line

    NOTE The Model 6842 antenna does not require pressurization or purging. The feed system up to the power divider may be pressurized. Installation of your Model 6842 2-bay is now complete. Please proceed to Startup on page 35.
  • Page 37 Connecting the Antenna (2-bay) Figure 17. Two-way power divider, mounted and connected...

  • Page 39: Chapter 8 Connecting The Antenna (3-Bay To 8-Bay)

    Connecting the Antenna (3-bay to 8-bay) Connecting the Antenna (3-bay to 8-bay) Mount the power a. Assemble the power divider mounts (Figure 18, 34): divider. (1) Using 1/2" stainless hardware and 36), attach the threaded rods (37) to the mount channel (38). Figure 18.

  • Page 40: Install The Optional Fine-Matching Transformer (If Applicable)

    Secure it using the clamp halves (40) to encircle the mounting pole as shown. Install the optional One of the unique features of Shively Labs antenna systems is the adjustable impedance-matching transformer (see Figure 20) optionally available with the fine-matching antenna.

  • Page 41: Connect The Tower Transmission Line

    Connecting the Antenna (3-bay to 8-bay) Figure 19. Bay cable connection CAUTION Stressing a coax connection after assembly can detune the system. Therefore, never make a connection and then bend or twist the cable, or use the connector to force the coax into shape. Form the cable first, then attach it to the connector.
  • Page 42 NOTE The Model 6842 antenna does not require pressurization or purging. The feed system up to the power divider may be pressurized. Installation of your Model 6842 3- to 8-bay is now complete. Please proceed Startup on page 35.

  • Page 43: Chapter 9 Startup

    To test and adjust VSWR safely, use low-power test equipment, such as a network analyzer. If you don't have access to low-power test equip- ment, please call Shively Labs before proceeding. WARNING Whenever a rigger is on the tower in the area of the antenna, shut off the transmitter signal and lock and tag it out so that it cannot be turned on accidentally.

  • Page 44: Trim Impedance

    VSWR or return power reading. This is the optimal transformer setting at this frequency. f. VSWR for each frequency at this point should be below 1.2 : 1. If it is not, call Shively Labs to help identify the problem.

  • Page 45: Before Beginning Checkout

    Take initial readings, and repeat the readings periodically. Performance readings should not change, and there should be no evidence of abnormal heating in the antenna system. If any problem is found, fix it now. Call Shively Labs if you need help or advice. Operate.
  • Page 46 Startup Figure 21. Apply the signal.

  • Page 47: Chapter 10 Maintenance

    Maintenance Maintenance WARNING Whenever a rigger is on the tower in the area of the antenna, shut off the signal and lock it off so that it cannot be turned on accidentally. RF emissions at close range are hazardous. We recommend that you keep a log of VSWR readings and any other perfor- mance notes and maintenance history for your antenna.

  • Page 49: Chapter 11 Parts

    Parts Parts Bay components Table 4. Components, 6842 bay without de-icers (per antenna bay) Part Number Description Qty. 1. 99718-G504 Bay assembly with arms & mounting bracket 2. 01/4-20SS028HM • Screw, hex head 1/4-20 x 1-3/4" SS 3. 01/4-20SSN •...
  • Page 50 Parts Figure 22. Components, 6842 bay without endseal radome Table 6. Kit, endseal radome (per antenna bay) Part Number Description Qty. 17. 01/4-20SS040SC Screw, socket head 1/4-20 x 2-1/4", SS 18. 01/4SSS Washer, lock 1/4", SS 19. 99718-03-01 Disc, radome support half 20.
  • Page 51 Parts Figure 23. Endseal radome components...

  • Page 52: Feed System Components

    Parts Feed system Table 7. Components, feed system for single-bay antenna components Part Number Description 2-bay Qty. 26. 9068-215 O-ring for 7/8" EIA flange 27. 82912-G507M Kit, hardware for 7/8" EIA flange 28. TY529MX Tie-wrap Table 8. Components, feed system for 2-bay antenna Part Number Description 2-bay...
  • Page 53 Parts Table 9. Components, feed system for 3-bay antenna (continued) Part Number Description 3-bay Qty. 27. 82912-G507M Kit, hardware for 7/8" EIA flange 31. 99715-G5xx Coax cable section, HCA78-50J, 7/8" EIA to 7/8" EIA 28. TY529MX Tie-wrap 46. 9068-340 O-ring for 3-1/8" EIA flange 47.
  • Page 54 Parts Table 11. Components, feed system for 5-bay antenna Part Number Description 5-bay Qty. NOTE Feed system for 3- to 8-bay arrays is shown in Figure 18 page 31. 34. 98141-G504 Mount, 3-1/8" power divider 35. 01/2-13SS • Nut, hex 1/2-13 SS 36.
  • Page 55 Parts Table 12. Components, feed system for 6-bay antenna (continued) Part Number Description 6-bay Qty. 44. 6114-400 Clamp, hose 50. 318F-078F x 6 Power divider, 6-way, 3-1/8" EIA to 7/8" EIA 26. 9068-215 O-ring for 7/8" EIA flange 27. 82912-G507M Kit, hardware for 7/8"...
  • Page 56 Parts Accessories and Table 14. Accessories and optional items for single-bay antenna optional items Part Number Description Qty. 52. 56009-G501 Harness, de-icer main 53. 99952-G502 Fine matcher, 1-5/8" 31. 9068-328 • O-ring, silicone, 1-5/8" EIA flange 54. Various Mount assembly, fine matcher Adapter, 1-5/8"...
  • Page 57 Parts Table 19. Accessories and optional items for 6-bay antenna Part Number Description 63. 56009-G506 Harness, de-icer main, 6 bays 57. 99952-G501 Fine matcher, 3-1/8" 45. 9068-340 • O-ring, silicone, 3-1/8" EIA flange 60. Various Mount assembly, 3-1/8" fine matcher Table 20.
  • Page 59 Appendix A Selected Assembly Drawings  The following are excerpts from selected assembly drawings.
  • Page 60 Figure A-1. 22° Feed Strap with Endseal Radome & Deicer...
  • Page 61 Figure A-2. 6842 Exploded View with Endseal Radome...
  • Page 62 Figure A-3. Bay Arm Stickers...
  • Page 63 Figure A-4. Power Divider Mount Detail...

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