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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.

Log

We recommend that you keep a log of VSWR readings and any other perfor-

mance notes and maintenance history for your antenna. Such a record can be

invaluable for troubleshooting.

Inspection

Whenever a rigger is on the tower for any reason, it is a good idea to have

him check your antenna for general condition, looseness of connectors and

mounts, and electrical damage.

Paint

The radiator should never be painted; this will affect the VSWR.

Return policy

When returning any material to the factory, be sure to call your salesperson

and obtain an returned materials authorization (RMA) number first. Material

may be refused and sent back to you at your expense if you don’t do this.

Troubleshooting

Broad spectrum RF noise.

This indicates that some component is not in good electrical contact with the

tower. Make sure mounts are tight, that tower paint has been removed from

under the mounts, and that components of other systems are likewise in good

contact with the tower.

High VSWR

This is caused by any factor that changes the impedance match between the

antenna and the transmitter. Look for:

• Defective RF connector. Make sure connectors are in good shape,

and that center pins are not bent over.

• Damage to any antenna components.
• Paint on radiators.
• Ice buildup on radiators.
• Interference from other tower components, especially components

broken by wind or ice.

Change in coverage

This may be caused by the same factors that can cause high VSWR. Look for

VSWR changes as well.
Do recognize, however, that apparent changes in coverage may be due to sub-

jective factors or faults of the receiving equipment. Before doing more than

checking the VSWR, be sure that an actual coverage change has occurred.

Содержание 6822

Страница 1: ...Circularly Polarized FM Broadcast Antenna Model 6822 Instruction Manual Installation Operation Maintenance ...

Страница 2: ...chnical 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 read thi...

Страница 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 ...

Страница 4: ......

Страница 5: ...ize to 3 1 2 inches outside diameter 13 Mounting pipe size 3 1 2 inches to six inches outside diameter 13 Figure 11 Mount attachment pipe size up to 3 1 2 inches 14 Table 2 Mounting U bolt usage 14 Figure 12 Mount attachment pipe size 3 1 2 to 6 15 Attach the bay arms 15 Figure 13 Bay arm attachment 16 Attach the bay cable single bay antenna only 16 Attach the feedstraps to the endseal 16 Figure 1...

Страница 6: ...e connection 36 Connect the tower transmission line 37 Figure 27 Tower transmission line connection 38 Chapter 7 Installing the De icer System if applicable 39 Precautions 39 De icer system description 39 Dual setting thermostat 39 Electric power 39 Table 3 De icer specifications 39 De icer installation 40 Installing the de icer junction boxes 40 Figure 28 De icer junction box installation 40 Figu...

Страница 7: ...able 5 Components antenna bay without de icer per bay 57 Figure 42 Components 6822 bay without de icers 58 De Icer Components 59 Table 6 Components de icer per bay 59 Figure 43 Components 6822 de icer 59 Mounting system components 60 Up to 3 1 2 mounting pipe OD 60 Table 7 Components mounts for up to 3 1 2 mounting pipe per antenna bay 60 Figure 44 Components mounts for up to 3 1 2 mounting pipe 6...

Страница 8: ...mponents feed system for 6 bay antenna per array 65 Table 15 Components feed system for 8 bay antenna per array 66 Figure 47 Feed system components 8 bay antenna 67 Accessories and optional items 68 Table 16 Accessories and optional items 68 Figure 48 Slugged line section if applicable components 69 Figure 49 Fine matching transformer optional components 70 ...

Страница 9: ... all the illustrations in this manual Set up the mounting location Remember It is YOUR responsibility to ensure that your installation meets all appli cable codes and the centerline of radiation requirements of your FCC construction permit CAUTION Before attaching the pipe mounts to the tower scrape away tower paint to ensure good electrical contact If you don t the antenna may gener ate unwanted ...

Страница 10: ...ethod can only be used for a single bay antenna because it allows no location to mount a power divider If your support pipe is mounted on top of a tower or building Figure 9 locate the antenna with at least ten feet 3 1 m of vertical clearance between the bottom antenna bay and the top of the tower or building Then mount the pipe in accordance with the guidelines above Preparing the tower leg or m...

Страница 11: ...3 Preparation Figure 1 Mounting options ...

Страница 12: ...Preparation 4 Figure 2 Tower layout single antenna bay ...

Страница 13: ...5 Preparation Figure 3 Tower layout two bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 14: ...Preparation 6 Figure 4 Tower layout three bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 15: ...7 Preparation Figure 5 Tower layout four bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 16: ...Preparation 8 Figure 6 Tower layout five bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 17: ...9 Preparation Figure 7 Tower layout six bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 18: ...Preparation 10 Figure 8 Tower layout eight bay antenna IMPORTANT If you ordered a custom spaced antenna please refer to your antenna test data sheet for bay to bay spacing ...

Страница 19: ...11 Preparation Figure 9 Top mounted installation ...

Страница 20: ...Preparation 12 Figure 10 Proper and improper securing of bay cables ...

Страница 21: ... the slots in the mount Install the hardware 33 34 and 35 loosely onto the U bolts Discard the unused U bolts Mounting pipe size 3 1 2 inches to six inches outside diameter NOTE For mounting pipes up to 3 1 2 diameter see the previous section NOTE The mount is reversible and can be attached to either side of the bay weldment a Using two screws Figure 12 1 with hardware 2 3 and 4 attach the balun m...

Страница 22: ...unt attachment pipe size up to 3 1 2 inches Table 2 Mounting U bolt usage Mounting pipe size U bolt size Up to 2 inches 5 1 cm outside diameter 2 in 6 35 cm 2 to 4 in 5 to 10 2 cm 4 in 10 2 cm 4 to 6 in 10 to 15 2 cm See Figure 12 ...

Страница 23: ...of your antenna a Locate the inner and outer dipole arms Figure 13 7 The sliding V arms 18 on each dipole arm are factory assembled and adjusted for proper performance all the same and secured with hose clamps 19 b Using upper arm clamps 6 and 5 16 18 hardware 1 2 3 and 4 attach the two dipole arms 7 to the saddles on the bay weldment 5 as shown Tighten in accordance with Table 1 ...

Страница 24: ... feedstraps to the endseal NOTE The feedstraps are shipped in place on the dipole arms a Remove the wingnut and washers from the endseal Figure 14 9 the white plastic dome on the antenna weldment CAUTION Do NOT move the feedstrap clips on the sliding V arms The antenna was tuned with the clips in place If you move them the antenna will not work as expected b Loosen the feedstrap clip hardware 10 j...

Страница 25: ...17 Bay Assembly Figure 14 Bay cable feedstrap attachment bay cable for single bay antenna only d Tighten the feedstrap clip hardware only until the lock washer flattens Do not overtighten ...

Страница 26: ......

Страница 27: ... locations you marked on the mounting pipe Set up the mounting location on page 1 scrape away any paint or other coating to achieve good electrical contact NOTE Mount antenna bays with feed straps up clear of all guylines and other obstructions b Using the U bolts Figure 15 31 or 32 attach the antenna bays at the marked locations c Repeat for the other antenna bay s as applicable d Align the bays ...

Страница 28: ...38 and 39 attach the antenna bays at the marked locations Tighten in accordance with Table 1 on page 1 c Repeat for the other antenna bay s as applicable d Align the bays to the correct azimuth and align them vertically with each other then tighten the mounting hardware in accordance with Table 1 on page 1 e Repaint the pipe as needed around the antenna bay mount Figure 16 Bay mounting on pipe 3 1...

Страница 29: ...e to the input of the antenna bay cable Figure 17 8 Tighten in accordance with Table 1 on page 1 Figure 17 Single bay antenna connection c Loop or drape any excess cable and secure it to the pipe using tie wraps 44 or customer supplied clamps to prevent wind damage to the cables and to ensure the weight of the cable is not carried by the antenna input NOTE The Model 6822 bay does not require press...

Страница 30: ......

Страница 31: ...r 58 to the mounting structure with its outlet ports roughly halfway along the antenna array Locate the mounts as close to the ends of the power divider as you can NOTE You may need to provide a coax adapter between your transmission line and the power divider Figure 18 Power divider mounting NOTE Two way and 4 way feed systems shown Three five and six way feed sys tems are similar ...

Страница 32: ...adapter between your transmission line and the slugged line section Install the slugged line section 70 or 71 as applicable at the input flange of your power divider Figure 20 46 49 52 55 or 58 as follows a Ensure there is an inner conductor connector in the slugged line section outlet flange b Attach the mounts 45 to the slugged line section close to the ends c Coat the O ring 43 or 54 as applica...

Страница 33: ...25 Connecting the Antenna 2 to 6 bay Figure 19 Slugged line section installation if applicable ...

Страница 34: ...ax adapter between your transmission line and the fine matching transformer Install the transformer at the input flange of your power divider Figure 20 46 49 52 55 or 58 as applicable or slugged line section 70 or 71 as applicable as follows a Ensure there is an inner conductor connector in the transformer outlet flange b Attach the transformer mounts 45 to the transformer close to the ends c Coat...

Страница 35: ...27 Connecting the Antenna 2 to 6 bay Figure 20 Fine matching transformer installation ...

Страница 36: ...ding radius for 1 2 coax is 3 8 cm Do not bend it too tightly you may damage it CAUTION Do not overtighten the connectors Overtightening may damage them a Connect the output end 90 connectors of the antenna bay cable 47 50 56 or 59 to the DIN connector at the bottom of the endseal Figure 21 Antenna bay cable connection b Run the cable along the antenna weldment and secure it using tie wraps 44 so ...

Страница 37: ...put if applicable b Coat the O ring 54 lightly with O Lube supplied with the antenna then install it in the O ring groove in the flange c Using the 1 5 8 EIA flange hardware kit Figure 22 45 attach the tower transmission cable to the power divider or transformer input Tighten in accordance with Table 1 on page 1 d Secure the tower transmission cable to the mounting pipe or tower leg using tie wrap...

Страница 38: ...to ensure the weight of the cable is not carried by the antenna input NOTE The Model 6822 antenna does not require pressurization or purging The feed system up to the power divider may be pressurized Installation of your Model 6822 2 to 8 bay antenna is now complete Please proceed to Startup on page 51 ...

Страница 39: ...able In the event your antenna has non standard bay spacing or other special fea tures we may have provided you with a line section containing a slug to perfect the tuning of the antenna This is to be installed between the output of the transformer if applicable and the input of the power divider CAUTION Do not remove or modify the slug from the slugged line section This will ruin your antenna s p...

Страница 40: ...Connecting the Antenna 8 bay 32 Figure 23 Power divider mounting for 8 bay antenna ...

Страница 41: ...33 Connecting the Antenna 8 bay Figure 24 Slugged line section installation if applicable ...

Страница 42: ...ner NOTE You may need to provide a coax adapter between your transmission line and the fine matching transformer Install the transformer at the input flange of your power divider 62 or slugged line section 71 if applicable as follows a Ensure there is an inner conductor connector in the transformer outlet flange b Attach the transformer mounts 45 to the transformer close to the ends c Coat the O r...

Страница 43: ...35 Connecting the Antenna 8 bay Figure 25 Fine matching transformer installation ...

Страница 44: ...ng radius for 1 2 coax is 3 8 cm Do not bend it too tightly you may damage it CAUTION Do not overtighten the connectors Overtightening may damage them a Connect the output end 90 connectors of the antenna bay cable 47 50 56 or 59 to the DIN connector at the bottom of the endseal Figure 26 Antenna bay cable connection b Run the cable along the antenna weldment and secure it using tie wraps 44 so as...

Страница 45: ...ove in the flange c Using the flange hardware kit 42 or 53 as applicable attach the tower transmission cable to the power divider or transformer input Tighten in accordance with Table 1 on page 1 d Secure the tower transmission cable to the mounting pipe or tower leg using tie wraps or customer supplied cable clamps e Loop or drape any excess cable and tie wrap it to the pipe to prevent wind damag...

Страница 46: ...Connecting the Antenna 8 bay 38 Figure 27 Tower transmission line connection ...

Страница 47: ...ostat readings Table 4 on page 44 Your system may also include specially ordered items such as a ground mounted main control box a power cable extending up the tower or a tower mounted dual setting thermostat Dual setting thermostat CAUTION 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 formi...

Страница 48: ... antenna mast through the side port of the junction box Figure 28 De icer junction box installation b Screw the junction box onto the threaded end of the antenna mast as shown Figure 29 Tighten the jam nut against the junction box 8 Bay single circuit 36 3 3 Table 3 De icer specifications continued Heater leg resistance Heater leg T1 or T2 current draw amps ...

Страница 49: ...le section At the top end the components are pre assembled and tightened c At the bottom end Figure 30 the components are only loosely assembled and the outer cable insulation and the braided sheath have been cut back to the proper length at the factory Figure 30 Interbay cable section bottom end d Install the top end of the cable section 1 Apply PTFE tape to the body threads on the top end 2 Turn...

Страница 50: ...end it back over the grommet Figure 32 Figure 32 Sheath bent back over the grommet 4 Insert the leads through the body and the top port of the second junction box 5 Press the bushing unraveled sheath and all into the body Figure 33 Then screw the cable gland over the retainer and onto the bushing and tighten Figure 33 Final assembly top of second junction box ...

Страница 51: ... schematic diagram NOTE Wire nuts cover with screws and gaskets and tie wraps are provided with the de icer cable sec tions NOTE Customer supplied items are shown in broken lines CAUTION Shively Labs s de icer control box Model 94068 is designed for interior installation only ...

Страница 52: ...nt it at your discretion We recommend mounting it as close as practical to the antenna CAUTION When testing the thermostat be sure to have one or both thermostat leads disconnected before taking resistance readings Otherwise read ings may be affected by other components a Before you connect the thermostat measure the resistance across the thermostat circuit and from it to ground to ensure that the...

Страница 53: ...ter signal and lock and tag it out so that it cannot be turned on accidentally Low power test equipment should be used to prevent excessive radia tion exposure to the person doing the adjusting A high transmission line VSWR may indicate damaged transmission line and is likely to cause problems in the future including serious damage to your equip ment Setup a Adjust the arm lengths and feed straps ...

Страница 54: ...ng 46 Tuning Figure 35 Arm length vs frequency Figure 36 Feed strap angle vs frequency a Tweak for minimum VSWR from there see Chapter 9 The specification is less than 1 2 1 Figure 37 Figure 38 and Figure 39 ...

Страница 55: ...47 Retuning Figure 37 Optimal VSWR at 108 MHz narrow feedstrap ...

Страница 56: ...Retuning 48 Figure 38 Optimal VSWR at 108 MHz wide feedstrap ...

Страница 57: ...49 Retuning Figure 39 Optimal VSWR at 88 MHz wide feedstrap ...

Страница 58: ......

Страница 59: ...igh transmission line VSWR may indicate damaged transmission line and is likely to cause problems in the future including serious damage to your equip ment Read transmission line VSWR The first step is to characterize the transmission line by itself a Briefly disconnect the transmission line from the antenna system input Seal the antenna system input to prevent the entry of moisture b Terminate th...

Страница 60: ...ement is seen d Adjust the second and third tuning stubs in the same manner NOTE If you get lost return all three tuning stubs to the factory setting all the way out and start over e Return to the first tuning stub and so forth until you have the lowest possible VSWR or return power reading This is the optimal transformer setting at this frequency f VSWR for each frequency at this point should be ...

Страница 61: ...transmitter readings stability and general operation 2 Run at about half power for at least an hour reading forward and reflected power stability etc 3 If the system is stable and seems to be operating properly bring it up to full power Take initial readings and repeat the readings periodically c Performance readings should not change and there should be no evidence of abnormal heating in the ante...

Страница 62: ...Startup 54 Figure 41 Apply the signal ...

Страница 63: ...k to you at your expense if you don t do this Troubleshooting Broad spectrum RF noise This indicates that some component is not in good electrical contact with the tower Make sure mounts are tight that tower paint has been removed from under the mounts and that components of other systems are likewise in good contact with the tower High VSWR This is caused by any factor that changes the impedance ...

Страница 64: ......

Страница 65: ...ldment 1 6 97353 09 Clamp upper arm 4 7 97353 01 Arm dipole 2 8 97353 G505 036 00 single bay antenna only Cable assembly 7 16 DIN female to 90 7 16 DIN male 36 long 1 9 99786 G502 Endseal assembly 1 10 97353 07 Clip feedstrap 2 11 97353 10 Feedstrap 2 12 96384 11 Washer 10 endseal brass Bokers 2 13 01 4 20SS016HM Screw hex head 1 4 20 x 1 1 4 SS 2 14 01 4 20SS Nut hex 1 4 20 SS 2 15 01 4SSF Washer...

Страница 66: ...Parts 58 Figure 42 Components 6822 bay without de icers ...

Страница 67: ...t Number Description Qty 23 51299 G5XXX XX LG De icer bay to bay box cable assembly 3 conductor with shield 1 24 97353 12 Box aluminum conduit tee 1 25 2426 141 Locknut 1 2 pipe 1 26 52762 CUP 1 Plug pipe 1 2 NPT end bay only 1 27 2426 RC55 Nut wire crimp on 2 28 2426 2521 Connector liquid tight 1 2 2 ...

Страница 68: ...pe per antenna bay Part Number Description Qty 29 98141 07 Mount balun for 1 50 3 50 OD pipe 1 30 6384 16 U bolt 1 pipe 2 31 55020 48 U bolt stainless 4 00 2 32 55020 49 U bolt stainless 2 50 2 33 03 8 16SS Nut hex 3 8 16 SS 8 34 03 8SSF Washer flat 3 8 SS 8 35 03 8SSS Washer split lock 3 8 SS 8 1 5 16 18SS036HM Screw hex head 5 16 18 x 2 1 4 SS 2 2 5 16 18SS Nut hex 5 16 18 SS 2 3 5 16SSF Washer ...

Страница 69: ...3 1 2 6 5 8 OD 1 1 5 16 18SS036HM Screw hex head 5 16 18 x 2 1 4 SS 2 2 5 16 18SS Nut hex 5 16 18 SS 2 3 5 16SSF Washer flat 5 16 SS 4 4 5 16SSS Washer split lock 5 16 SS 2 30 6384 16 U bolt 1 pipe 2 37 G58NUT Nut hex 5 8 11 heavy galvanized 12 38 G58FW Washer flat 5 8 heavy galvanized 12 39 G58LW Washer split lock 5 8 galvanized 8 40 G58R 12 Rod full threaded 5 8 11 galvanized 4 41 98141 04 Clamp...

Страница 70: ...Parts 62 Figure 45 Components mounts for 3 1 2 to 6 mounting pipe ...

Страница 71: ... on input end and 90 7 16 DIN male on output end 2 48 97353 G505 96 00 Half wave spaced Coax cable section 8 ft 2 44 m long 7 16 DIN male on input end and 90 7 16 DIN male on output end 2 44 TY529MX Tie wrap 12 Table 11 Components feed system for 3 bay antenna per array Part Number Description Qty 45 98162 G501 Kit power divider mount 7 8 1 5 8 1 49 078F 716X3 Power divider 3 way 7 8 EIA flange to...

Страница 72: ...Parts 64 Figure 46 Feed system components for 2 to 6 bay antennas ...

Страница 73: ...er mount 7 8 1 5 8 1 55 158F 716X5 Power divider 5 way 1 5 8 EIA flange to 7 16 DIN male 1 54 82912 G501 Kit flange hardware 1 5 8 flange 1 55 9068 328 O ring silicone 1 5 8 EIA flange 1 56 97353 G505 336 00 Full wave spaced Coax cable section 28 ft 8 54 m long 7 16 DIN male on input end and 90 7 16 DIN male on output end 5 57 97353 G505 168 00 Half wave spaced Coax cable section 14 ft 4 27 m long...

Страница 74: ...ardware 1 5 8 flange 1 55 9068 328 O ring silicone 1 5 8 EIA flange 1 63 98361 G501 Mount base assembly 2 64 98359 G503 Saddle assembly 1 5 8 2 65 6114 Clamp hose 4 66 99459 G501 168 00 Full wave spaced Air flex high power line section flanged long with 1 5 8 ter minals 2 67 99459 G501 054 00 Half wave spaced Air flex high power line section flanged long with 1 5 8 terminals 2 68 97353 G505 240 Fu...

Страница 75: ...67 Parts Figure 47 Feed system components 8 bay antenna ...

Страница 76: ...ction slugged 1 5 8 1 54 82912 G501 Kit flange hardware 1 5 8 flange 1 55 9068 328 O ring silicone 1 5 8 EIA flange 1 72 99952 G502 Transformer fine matching 7 8 EIA 1 42 82912 G506 Kit flange hardware 7 8 flange 1 43 9068 215 O ring silicone 7 8 EIA flange 1 73 99952 G502 Transformer fine matching 1 5 8 EIA 1 54 82912 G501 Kit flange hardware 1 5 8 flange 1 55 9068 328 O ring silicone 1 5 8 EIA f...

Страница 77: ...69 Parts Figure 48 Slugged line section if applicable components ...

Страница 78: ...Parts 70 Figure 49 Fine matching transformer optional components ...

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