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17

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)

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Summary of Contents for 6600

Page 1: ...Horizontally Polarized FM Broadcast Antenna Model 6600 Instruction Manual Installation Operation Maintenance ...

Page 2: ...ts Our technical staff has a wealth of experience in the broadcast industry and is standing by to serve you in any way This manual is intended to give you a good basic understanding of your antenna its proper and safe installation startup and operation and trouble shooting and maintenance information to keep it working satisfactorily for years to come Please have everyone involved with the antenna...

Page 3: ...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 4: ......

Page 5: ...Common Mounting Styles 10 Installing the Feedline Sections 11 Figure 7 Common Feedline Mount Configurations 12 Installing the Transformer 13 Figure 8 Transformer Installation top view 13 Chapter 5 Installing the De Icer System if applicable 15 Before Beginning De Icer Installation 15 Installation Procedure 15 Figure 9 De Icer Electrical Schematic 16 Figure 10 Bay Junction Box Installation 17 Figur...

Page 6: ...apter 8 Troubleshooting 33 Precautions 33 Internal Arcing 33 Table 7 Troubleshooting Internal Arcing 33 Broad Spectrum RF Noise 33 High VSWR at Startup or during Operation 34 Table 8 Troubleshooting High VSWR 34 Erratic VSWR During Transformer Adjustment Impedance Trimming 35 Change in Coverage 35 Pressure Loss or Excessive Gas Usage 35 Table 9 Troubleshooting Pressure Loss or Excessive Gas Usage ...

Page 7: ... Then open the boxes and examine for shipping damages File any necessary claims with the carrier immediately c 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 it s in the block at the bottom right ...

Page 8: ...sets leg flanges guys and their attachment points tower face members obstruction lights and other components Compatibility of transmission line and antenna input terminals Location of the transmission line run relative to the antenna input terminal Use of non metallic guy sections on the tower in the region to be occupied by the FM antenna Ensure that there are no metal guys within ten feet three ...

Page 9: ...om physical damage by caps and plastic bags Do not remove this protection until ready to connect the components 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 Be sure the O ring is properly seated in its groove and...

Page 10: ...ductor of the baymount flange NOTE The hardware is shipped in place on the baymount flange f Remove the O ring and coat it lightly with petroleum jelly supplied with the antenna then reinstall it in the O ring groove in the flange g Make sure an inner conductor connector is in place in the inner conductor of the line section Figure 2 Radiator Installation exploded view h Remove the radiator assemb...

Page 11: ... snug the flange bolts in the sequence shown in Figure 3 on page 5 then tighten them to the torque specification shown in Table 1 on page 5 Figure 3 Flange Bolt Tightening Sequences k Clamp the mounting saddle to the feedline using a hose clamp NOTE The mounting saddle is not required if radomes are to be installed l Repeat the above steps for the remaining radiators Table 1 Torque Specifications ...

Page 12: ......

Page 13: ...CAUTION Radome halves are match marked in pairs A A B B etc In order to align the flange bolt holes be sure to pair them according to their match markings NOTE Radome match markings bear no relation to radiator and feedline mark ings Install any radome on any bay Installation of Radomes Figure 4 Radome Installation ...

Page 14: ... the foam if it has come loose f Carefully place the top radome half in place slipping it under the radiator and up against the baymount g Slip the removed part of the radome mount into place Bolt it to the radome half and then lightly clamp it to the feedline with a hose clamp h Carefully place the bottom radome half in place slipping it under the radiator and up against the baymount with its fla...

Page 15: ...the bullet guides are in place before assembly Important To avoid damage to the antenna always lift position and attach each section individually Never try to transport connected feedline sections This rule is often violated and is frequently the cause of expensive dam age to feedline CAUTION If you don t get good electrical contact between the mounts and the tower the antenna may not perform as d...

Page 16: ...e 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 Be sure the O ring is properly seated in its groove and not pinched between the flange contact surfaces Installing the Feedline Mounts Figure 6 Common Mounting Styles ...

Page 17: ...ion drawing Mark the mount locations b Mark the specified location of any accessory mounts such as for the transformer or special coax input line sections to make sure they will fit as planned c Watch carefully for any interferences by tower members or guy wires which were not accounted for in the design d Where the mounts will be in contact with the tower or pole scrape the tower paint away to en...

Page 18: ...owers 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: ...res 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 NOTE The transformer may be oriented in whichever direction you wish see Figure 8 Make it easy for yourself to reach for adjustment at startup Install the transform...

Page 20: ......

Page 21: ...tower junction box as shown in Figure 9 on page 16 and the control box as shown in Figure 13 on page 19 CAUTION When testing the thermostat in step k be sure to disconnect one or both thermostat leads before taking resistance readings Otherwise readings may be affected by other components CAUTION The resistance readings in tables 3 through 6 are for the Shively sup plied portion of the systems onl...

Page 22: ...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 NOTE Customer supplied items are shown in broken lines ...

Page 23: ...17 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: ...line section See Figure 11 on page 17 c Connect the leads from each bay de icer to the main harness in that bay s junction box as shown in Figure 10 on page 17 Secure any slack in these cables to the feedline with tie wraps to avoid wind damage d Furnish a tower junction box as shown in Figure 9 on page 16 NOTE Shively recommends the use of shielded braided polyethylene covered wire or rubber shea...

Page 25: ...ox as shown in Figure 12 on page 18 i Run a power cable from the control box in the building to the tower junction box and connect it to the de icer harness pigtail s in the tower junction box NOTE The wire size must account for the total current draw of the cable run to the antenna and the de icer system itself j After installation is complete measure the resistance from each heater leg to ground...

Page 26: ...current readings in your maintenance log for future reference in troubleshooting the de icer system See Sample Maintenance Log on page 40 for a suggested log format Table 2 Single Thermostat Readings Reading Location Ambient Tem perature Resistance 0 ohms short circuit Resistance infinite ohms open circuit Leg to Ground Any Defective thermo stat or shorted leads OK Leg to Leg Above about 38 F 3 3 ...

Page 27: ... tance Heater Leg L1 or L2 Current Draw amps 1 Bay 60 1 5 2 Bay 30 3 0 3 Bay 20 4 5 4 Bay 15 6 0 5 Bay 12 7 5 6 Bay 10 9 0 7 Bay 8 6 10 5 8 Bay single circuit 7 5 12 0 10 Bay single circuit 6 15 0 12 Bay single circuit 5 18 0 14 Bay each of 2 circuits 8 6 10 5 16 Bay each of 2 circuits 7 5 12 0 ...

Page 28: ......

Page 29: ...haracterization is at your discretion we strongly recom mend it as the best way to identify both initial problems and possible future system damage CAUTION A high VSWR may indicate damaged transmission line and is likely to cause problems in the future including serious damage to your equip ment CAUTION When pressurizing the system never use a garage air compressor as it will not clean the air and...

Page 30: ...e 25 b Be sure to include a good quality gauge which reads accurately in the 5 20 psig 35 135 kPa range don t depend on the cylinder gauge which will not be accurate enough in this pressure range c Pressurize the system to eight 8 psig then close the shutoff valve Give the system one half hour to stabilize then record the pressure and the temperature d Wait twenty four hours then read the pressure...

Page 31: ...internal pressure enough to open the relief valve When the purge is complete lower the pressure and the valve will close When the system is new and any time that it has been opened it must be purged with dry gas before operation to eliminate moisture The dry gas used may be dry cylinder nitrogen or air from a compressor dehy drator Shively Labs suggests three volume changes of dry gas for an aver ...

Page 32: ...he volume inside the radiators NOTE A standard nitrogen cylinder 9 inch diameter by 55 inches tall contains about 200 cubic feet 2 6 m3 of gas e Shively Labs Models 1235 and 2577 compressor dehydrators will provide about 12 cubic feet 0 34 m3 per hour the Model 1234 about 78 cu ft 2 2 m3 per hour f Connect a source of dry gas cylinder nitrogen or air from a compressor dehydrator to the system as s...

Page 33: ...nd connect the transmission line to the transformer input with an O ring to seal the connection b Repeat the purge process after sealing the line in accordance with Purging the System on page 25 c Measure VSWR VSWR at this point should be below 1 2 1 d 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 ...

Page 34: ...djust the transformer as follows a Loosen the hose clamps on the control rods enough to allow the rods to move b Grasp either control rod and slide it in or out about 1 4 inch or 6 millimeters It will move stiffly because of O ring friction c Read the VSWR If the reading went down move the control rod again in the same direction If the VSWR went up move the same rod in the opposite direction Table...

Page 35: ...checkout of the antenna system be sure the following items have been done The antenna system has been installed in accordance with this manual and the installation drawing The de icer system if purchased has been checked out in accor dance with Chapter 5 All radiators are operating impedance has been trimmed and VSWR is low The transformer settings and initial characterization data have been recor...

Page 36: ......

Page 37: ...ly Labs antenna read and follow the maintenance section of this manual The De Icer System There is a generous margin of safety built into the de icer system and opera tion for prolonged periods below 60 F 16 C will do no harm If icing condi tions are expected the heaters should be turned on ahead of time as a preventive measure It is much easier to prevent ice formation than to remove a heavy coat...

Page 38: ......

Page 39: ...mer to correct the VSWR find and correct the problem quickly Otherwise you will almost certainly burn up your antenna and damage your transmitter Look for the cause in the follow ing table Internal Arcing Look for the cause of internal arcing in Table 7 Broad Spectrum RF Noise This indicates that some metal components are not in good electrical contact with the tower First check your antenna mount...

Page 40: ... has been damaged Mismatched assembly of the antenna The bays must be paired properly with their respective feedline sections and the assembly must be exactly as shown in the installation drawing Reassemble according to the instal lation drawing Radiators out of sequence especially on a center fed null filled or half wave spaced system Assemble the antenna exactly as shown in the installation draw...

Page 41: ...t to recognize however that apparent changes in coverage may be due to subjective factors or faults of the receiving equipment Before doing more than checking the VSWR be sure that an actual coverage change has occurred Pressure Loss or Excessive Gas Usage If your system will not hold pressure as described in Leak Testing on page 24 look for the cause in Table 9 Failure of de icers may have caused...

Page 42: ...nge Find the leaky O ring using soap solu tion Replace the O ring Leaky end seal see Figure 2 on page 4 Replace the leaky end seal Loose connecting hardware between line segments or between the bay mount and the radiators Tighten loose connections when found Mechanical damage to transmission line transformer or antenna Check for leaks using soap solution Replace damaged components ...

Page 43: ...conductor itself Support the weight of the radiator until the flange bolts are tightened 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 Be sure the O ring is properly seated in its groove and not pinched between th...

Page 44: ...s 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 to 1 2 1 The gain will drop to 83 of its former value Power output should also be dropped to 83 of normal output NOTE O rings and flange hardware are provided as spare parts with every antenn...

Page 45: ...turn 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: ...ample Maintenance Log DATE DE ICER CURRENT or resistance VSWR GAS PRESS OBSERVATIONS Visual Inspection of Antenna Obstruction Lighting Hardware Checked Tower Repairs Accomplished etc BLACK b neut NEUT red bl RED r neut ...

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