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Summary of Contents for Shively Labs 6814
- Page 1 Circularly Polarized FM Broadcast Antenna 6814 Model Instruction Manual Installation, Operation, & Maintenance...
- Page 2 Congratulations! Thank you for purchasing one of the finest FM broadcast antennas on the 6814 market today. The Shively Labs Model is widely recognized as the top- of-the-line in its class for its 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!
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Page 5: Table Of Contents
Table of Contents Chapter 1 Precautions and Preparation ..........1 Precautions................... 1 Receiving....................1 Unpacking .................... 1 Checking the system ................2 Chapter 2 Antenna Installation............3 Precautions................... 3 Installing the radiators................3 Figure 1 Baymount detail ..............3 Figure 2 Radiator installation, exploded view ........4 Figure 3 Flange bolt tightening sequence ......... - Page 6 Table 5 Factory control rod settings ..........20 System sweep (recommended) ............21 Checkout .................... 21 Antenna operation................22 De-icer system operation ..............22 Shively Labs de-icer control system ..........22 Chapter 5 Maintenance ..............23 Precautions..................23 Maintenance log.................. 23 Physical inspection ................23 De-icer check..................
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Page 7: Chapter 1 Precautions And Preparation
If all the boxes are present and in good condition but material seems to be missing, please contact Shively Labs immediately, using the telephone or Fax number on the inside cover of this manual. For the best service, have our shop order number (S/O) handy;... -
Page 8: Checking The System
Have a reliable tower person, familiar with antennas and coaxial line, inspect the tower and review the installation drawings before the full rigging crew arrives. If design problems are found, contact Shively Labs immediately. Pay particu- lar attention to: • Frequency of the antenna. -
Page 9: Chapter 2 Antenna Installation
Antenna Installation Antenna Installation Precautions WARNING Don't expose personnel to the medical hazards of intense radio fre- quency (RF) radiation. Whenever working on the tower in the area of the antenna, turn off all transmitters and lock them out so that they can- not be turned on accidentally. -
Page 10: Figure 2 Radiator Installation, Exploded View
Antenna Installation CAUTION All O-rings are made of silicone. Do not lubricate them with silicone grease, as this will soften the O-ring. Use only a light lubricating coat of O-Lube (provided) or petroleum jelly; too much may hamper electrical contact and contaminate the interior of the system. Be sure the O-ring is properly seated in its groove and not pinched between the flange contact surfaces. -
Page 11: Installation Of Radomes (If Applicable)
Antenna Installation Figure 3. Flange bolt tightening sequence Table 1. Torque Specifications, Flange Bolts Transmission Line Bolt Size Torque Size 1-5/8" 5/16-18 12 ft-lb 16 N-m 2-1/8" 3/8-16 21 ft-lb 28 N-m 3-1/8" 3/8-16 21 ft-lb 28 N-m 4-1/16" 3/8-16 21 ft-lb 28 N-m j. -
Page 12: Figure 4 Radome Installation
Antenna Installation f. Using the four clamps, clamp the mount saddle to the feedline. g. Place the top radome half over the radiator and into the mount, slipping the end of the mount under the closure plate. h. Place the bottom radome half over the radiator and feedline and into the top radome half, inserting its mount into its closure plate. -
Page 13: Installing The Feedline Mounts
Antenna Installation k. Twist and clamp the loose ends of the ground straps to the feedline, as shown in Figure 5. This will prevent arcing between the mount and the feedline. Figure 5. Ground strap installation l. Tighten the closure plate bolts and the mount bolts, securing the bolted ends of the ground straps as well. -
Page 14: Figure 6 Common Feedline Mount Configurations
Antenna Installation Figure 6. Common feedline mount configurations Mounts may vary from bay to bay, especially on tapered towers or where tower obstructions exist. See your installation drawing for your mount configuration and special requirements, if any. CAUTION If you don't get good electrical contact between the mounts and the tower, the antenna may not perform as designed, and may produce stray signals that will interfere with other services on the tower. -
Page 15: Installing The Feedline Sections
When all mounts are in place, sight along them vertically and align them before finally tightening the hardware. g. Touch up any exposed metal on the tower or pole. If any problems appear during this process, please call Shively Labs and dis- cuss them with the installation designer. Installing the feedline CAUTION Feedline flanges are match-marked. -
Page 16: Installing The Transformer
5. d. Secure each feedline section to its mount before installing the next section. Installing the One of the unique features of Shively Labs antenna systems is the adjustable impedance-matching transformer provided with the antenna. It allows the transformer installer to compensate for changes in the input impedance caused by the installation (tower, conduit, ladder, etc.). -
Page 17: Chapter 3 De-Icer Installation (If Applicable)
Remember that conditions may be favorable for icing on the tower, even if they are not on the ground. Shively Labs de-icers are designed to prevent ice from forming on antenna elements and are not designed to melt ice that has already formed. For this... -
Page 18: Figure 9 De-Icer Electrical Schematic Diagram
De-Icer Installation (if applicable) Figure 9. 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 19: De-Icer Installation
De-Icer Installation (if applicable) Table 2. De-Icer specifications High-Band Low-Band (98.0-108.0 MHz (88.0-97.9 MHz) Heater Leg Heater Leg Heater Leg Heater Leg Resistance, (T1 or T2) Resistance, (T1 or T2) Current Draw, Current Draw, amps amps 1-Bay, single circuit 2-Bay 3-Bay 4-Bay... -
Page 20: Installing The Thermostat (If Applicable)
De-Icer Installation (if applicable) Figure 10. Bay junction box installation CAUTION Shively Labs's de-icer control box, Model 94068, is designed for interior installation only. NOTES Wire nuts, cover with screws, and gaskets, and tie-wraps provided with the de-icer cable har- ness. -
Page 21: Table 3 Thermostat Readings
De-Icer Installation (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° C) stat or shorted leads Between about 10°... -
Page 23: Chapter 4 Startup And Operation
Purge the system All pressurized Shively Labs antennas have a pressure relief valve at the top of the feedline (center-fed feedlines have a relief valve at each end). This valve is set to open at about 10 psig. So, to purge the system, it is not necessary to send a worker to the top of the antenna to open a valve or loosen a flange. -
Page 24: Figure 11 Pressurized Gas Schematic
Startup and Operation Figure 11. Pressurized gas schematic CAUTION If all moisture is not removed from the inte- rior of the system, it will condense when weather cools. The result- Purge your system as follows: ing water will cause arc- a. -
Page 25: Leave The System Pressurized
Startup and Operation c. Determine the volume of dry gas to use for the purge. Table 4 shows approximate volumes inside various coax sizes. Add the length of the antenna to the length of the transmission line to determine the overall length of the system. -
Page 26: Impedance Trimming
Startup and Operation Impedance trimming Figure 12. Impedance-matching transformer The transformer has been factory-adjusted to 50 ohms at your frequency. You will find a scribed line on each control rod shaft. It can be operated at that setting, but it will give optimal performance on your tower if you readjust it after installation. -
Page 27: System Sweep (Recommended)
Startup and Operation f. VSWR at this point should be below 1.10 : 1. If it is not, call Shively Labs to help identify the problem. g. When you have set the transformer, use a sharp point to scribe the shaft where it leaves the flange collar. -
Page 28: Antenna Operation
It is much easier to prevent ice formation than to remove a heavy coating. Shively Labs de-icer control If you have the Shively Labs de-icer control box and dual-setting thermostat, you have the choice of manual or automatic operation. There are three switch system settings: AUTOMATIC, OFF, and MANUAL. -
Page 29: Chapter 5 Maintenance
Physical inspection The antenna system should operate for years if properly installed and main- tained. Shively Labs recommends that as a minimum, the antenna should be at least once a year physically inspected In addition, inspect the antenna after severe weather events, and after climb- ers have been on the tower working on equipment above the antenna. -
Page 30: De-Icer Check
Troubleshooting Cantact Shively Labs if necessary to help find the cause of your problem. Out- side of 8:00 AM to 5:00 PM Eastern Time, call (207) 329-5118. Internal arcing The following may cause internal arcing: •... -
Page 31: High Vswr At Startup Or During Operation
Follow this sequence of actions: a. Repeat the purging process as described in Purge the system on page 17. b. Try again to trim impedance. c. If VSWR is still erratic, Your transformer is probably damaged. Contact Shively Labs. -
Page 32: Change In Coverage
Maintenance Change in coverage Changes in broadcast coverage may be caused by the same factors that pro- duce VSWR changes. If coverage seems to have changed, look for VSWR changes and use High VSWR at startup or during operation on page 25 for troubleshooting. -
Page 33: Sample Maintenance Log
Maintenance Sample maintenance DATE DE-ICER CURRENT VSWR OBSERVATIONS (or resistance) PRESS Visual Inspection of Antenna, Obstruction Lighting; Hardware Checked; Tower Repairs BLACK NEUT Accomplished; etc. (b-neut) (red-bl) (r-neut)
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