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Summary of Contents for Shively Labs 6600
- Page 1 Horizontally Polarized FM Broadcast Antenna Model 6600 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 Model 6600 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 Preparing for Installation ..........1 Receiving....................1 Unpacking .................... 1 Check the System ................. 1 Chapter 2 Installing the Radiators............. 3 Before Beginning Radiator Installation: ........... 3 Installation Procedure................3 Figure 1 Baymount Detail..............4 Figure 2 Radiator Installation, exploded view........ - Page 6 Table of Contents Initial Characterization (recommended) ..........27 Transmission Line VSWR Reading ........... 27 Transmission Line TDR Reading............27 System VSWR Reading ..............27 Checking Radiator Function............27 Adjusting the Transformer (Impedance Trimming)......... 28 Figure 15 Impedance-Matching Transformer ........28 Table 6 Factory Control Rod Settings ..........
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Page 7: Chapter 1 Preparing For Installation
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 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.
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Page 9: Chapter 2 Installing The Radiators
Installing the Radiators Installing the Radiators Before Beginning Important! Feedstrap orientation is critical to performance. In general, the feed- Radiator Installation: straps in a full-wave-spaced antenna will all be oriented the same, while Install each radiator those in a half-wave-spaced antenna will alternate. in accordance with its stenciled bay numbers and its "up-arrow"... -
Page 10: Figure 1 Baymount Detail
Installing the Radiators Figure 1. Baymount Detail d. Remove the plastic bag and protective cover (see Figure 1) from the baymount flange on the feedline. e. Make sure the inner conductor connector is in place and secure in the inner conductor of the baymount flange. -
Page 11: Figure 3 Flange Bolt Tightening Sequences
Installing the Radiators CAUTION Be sure the radiator’s inner conductor fits cleanly over the baymount’s inner conductor connector. If any of the fingers of the connector are forced outside the radiator’s inner conductor (we call this a "split bul- let"), this may cause arcing and damage to the antenna. i. -
Page 13: Chapter 3 Installing The Radomes (If Applicable)
Installing the Radomes (if applicable) Installing the Radomes (if applicable) Before Beginning CAUTION Radome halves are match-marked in pairs (A-A, B-B, etc.). In order to Radome Installation: align the flange bolt holes, be sure to pair them according to their match-markings. - Page 14 Installing the Radomes (if applicable) If your system includes radomes, you can most easily install them at this time. After installing the radiators, install each radome as follows (see Figure 4 page 7). a. Select a pair of radome halves match-marked with the same letter designation (A and A, B and B, etc.).
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Page 15: Chapter 4 Installing Feedline And Transformer
Installing Feedline and Transformer Installing Feedline and Transformer Before Beginning Feedline and Transformer Installation: Figure 5. Feedline Flange Detail CAUTION Mating feedline flanges are stamped with the same number. Assemble components in accordance with their match-markings (see Figure 5) and the installation drawing. -
Page 16: Installing The Feedline Mounts
Installing Feedline and Transformer CAUTION Do not use silicone grease on an O-ring, as this will soften the silicone O-ring. Use only a light lubricating coat of petroleum jelly (provided); too much may hamper electrical contact and contaminate the interior of the sys- tem. -
Page 17: 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 a. -
Page 18: Figure 7 Common Feedline Mount Configurations
Installing Feedline and Transformer Figure 7. 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 To prevent damage to feedline, be sure the feedline mount saddles are located against the brass portion of the feedline, and position the hose clamp screw housings over the saddles, not against the feedline. -
Page 19: Installing The Transformer
Figure 8. Transformer Installation, top view One of the unique features of Shively Labs antenna systems is the adjustable impedance-matching transformer provided with the antenna. It allows the installer to compensate for changes in the input impedance caused by the installation (tower, conduit, ladder, etc.). -
Page 21: Chapter 5 Installing The De-Icer System (If Applicable)
RF energy, and the entire outdoor por- tion of the system must be made waterproof. Note that unless an exterior box has been ordered specially, a de-icer control box purchased from Shively Labs is designed for interior installa- tion only. CAUTION... -
Page 22: Figure 9 De-Icer Electrical Schematic
Installing the De-Icer System (if applicable) Figure 9. De-Icer Electrical Schematic NOTE Interbay de-icer cables are #12 AWG, 600 V RMS. NOTE L1 is always red, L2 is black, N is white, ground is green. They are not in the same relative posi- tions in the various sche- matic diagrams. -
Page 23: Figure 10 Bay Junction Box Installation
Installing the De-Icer System (if applicable) Figure 10. Bay Junction Box Installation Figure 11. Mounting of Bottommost Bay Junction Box (as needed) (for center-fed antennas only) -
Page 24: Figure 12 Shively De-Icer Control Box Layout
Installing the De-Icer System (if applicable) The de-icer system requires 220 VAC, 50 - 60 Hz., single-phase. Table 4 page 21 shows approximate current draws for various models and configura- tions. Install the de-icer system as follows: a. Install the main de-icer harness with its bay junction boxes as shown in the installation drawing and Figure 10 on page 17. -
Page 25: Figure 13 De-Icer Control Box Electrical Schematic
Installing the De-Icer System (if applicable) Figure 13. De-Icer Control Box Electrical Schematic g. You may locate the thermostat, if applicable, at your discretion. We recommend mounting it as closely as practical to the antenna. h. Wire the thermostat and the main control box as shown in Figure 12 on page i. -
Page 26: Table 2 Single Thermostat Readings
Installing the De-Icer System (if applicable) k. Measure the resistance across the thermostat circuit and from it to ground in the same way. Test at the location shown in Figure 13 on page 19. Be sure to disconnect one or both thermostat leads before taking resistance readings. -
Page 27: Table 4 De-Icer Specifications
Installing the De-Icer System (if applicable) Table 4. De-Icer Specifications Heater Leg Resis- Heater Leg tance, (L1 or L2) Current Draw, amps 1-Bay 2-Bay 3-Bay 4-Bay 5-Bay 6-Bay 7-Bay 10.5 8-Bay, single circuit 12.0 10-Bay, single circuit 15.0 12-Bay, single circuit 18.0 14-Bay, each of 2 circuits 10.5... -
Page 29: Chapter 6 Startup
Important Shively Labs will not accept responsibility for antenna failure after opera- tion without proper purging or positive pressure of dry air or dry nitro- gen. -
Page 30: Pressurization
Startup CAUTION through You must blow dry gas the system, not just maintain a pressure. volume The gas accomplishes the purge. CAUTION Never operate the antenna system without proper purging and constant positive dry gas pressure. Pressurization After the antenna is installed and all lines are connected, it is necessary to check the system for leaks, purge with dry gas (cylinder dry nitrogen or air from a compressor-dehydrator) to remove all moisture, and leave the system pressurized with dry gas to avoid future infiltration of moisture. -
Page 31: Purging The System
F. Purging 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 32: Leaving The System Pressurized
A standard nitrogen cylinder (9 inch diameter by 55 inches tall) contains about 200 cubic feet (2.6 m ) of gas. e. Shively Labs Models 1235 and 2577 compressor-dehydrators will provide about 12 cubic feet (0.34 m ) per hour; the Model 1234 about 78 cu ft (2.2 ) per hour. -
Page 33: Initial Characterization (Recommended)
Record the reading and file it with this manual. e. If VSWR is not satisfactory, check to be sure all the radiators are functioning (see below). If they are, call Shively Labs to help identify the problem. Checking Radiator Function Again using the low-power test equipment to provide a signal to the antenna and read VSWR, have the rigger detune each radiator in turn. -
Page 34: Adjusting The Transformer (Impedance Trimming)
Startup Adjusting the Transformer (Impedance Trimming) Figure 15. Impedance-Matching Transformer 1-5/8" model shown. Others are similar. 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 35: Checkout
Return to the first rod, and so forth, until you have the lowest possible VSWR or return power reading. This is the optimal transformer setting. f. VSWR at this point should be below 1.10 : 1. If it is not, call Shively Labs to help identify the problem. -
Page 37: Chapter 7 Operation
Shively Labs upon request. If you have the Shively Labs de-icer control box, you have the choice of man- ual or automatic operation. There are three switch settings: AUTOMATIC, OFF, and MANUAL. -
Page 39: Chapter 8 Troubleshooting
Troubleshooting Troubleshooting Precautions WARNING Troubleshooting should be performed only by personnel experienced in RF systems and familiar with this equipment. WARNING The broadcast industry has recently recognized the potential medical hazards of intense radio frequency radiation. Don't expose personnel to personal harm. -
Page 40: High Vswr At Startup Or During Operation
Possible Causes: Cures: Wrong antenna for the application and Contact your sales representative frequency. Occasionally a customer pro- at Shively Labs. vides wrong data to Shively or buys a used antenna designed for another ap- (may interfere with other plication. -
Page 41: Erratic Vswr During Transformer Adjustment (Impedance Trimming)
Domes missing from vertical arms. An Contact Shively Labs for help in overheating de-icer can melt the solder troubleshooting the de-icers. from domes, spacers, and bushings at the ends of the vertical arms. -
Page 42: Table 9 Troubleshooting Pressure Loss Or Excessive Gas Usage
Troubleshooting Table 9. Troubleshooting Pressure Loss or Excessive Gas Usage Possible Causes: Cures: O-ring missing or poorly installed in Find the leaky O-ring using soap solu- transmission line, feedline, or tion. Replace the O-ring. baymount flange. Leaky end seal (see Figure 2 on page Replace the leaky end seal. -
Page 43: Chapter 9 Maintenance
Maintenance Maintenance Precautions WARNING Maintenance should be performed only by personnel experienced in RF systems and familiar with this equipment. WARNING The broadcast industry has recently recognized the potential medical hazards of intense radio frequency radiation. Don't expose personnel to personal harm. -
Page 44: De-Icer Check
VSWRs. If in doubt, contact your sales representative at Shively Labs. For example, the removal of one radiator from a six-bay antenna that has been trimmed to a VSWR of 1.05 : 1 or less will cause the VSWR to increase... -
Page 45: Troubleshooting
Maintenance Troubleshooting Troubleshoot the antenna system as described in Chapter Return Policy When returning any material to the factory, be sure to call your salesman and obtain an authorized return (AR) number first. Use this number in all corre- spondence. This number helps us to track your returned item. It will expedite repair or replacement and prevent loss of your material. -
Page 46: 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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