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Troubleshooting

7 Troubleshooting

Precautions

WARNING

Troubleshooting should be performed only by personnel experi-

enced in RF systems and familiar with this equipment.

WARNING

The broadcast industry has recently recognized the potential med-

ical hazards of intense radio frequency radiation. Don't expose

personnel to personal harm. For reference, see CFR 29, Section

1910.97, the OSHA standard for exposure to non-ionizing radia-

tion. Whenever a rigger is on the tower in the area of the

antenna, shut off the transmitter and lock it off so that it cannot

be turned on accidentally.

CAUTION

Whenever you have the system open for repair, you must purge it

again as described in

Purging the System

on page 16. Never

begin operating the system under power until you are sure all the

moisture has been purged from it. You can do permanent damage

to the entire system, including the transmitter.

CAUTION

VSWR does not change of its own accord. If you find you must

repeatedly readjust the transformer 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 following table.

Internal Arcing

Look for the cause of internal arcing in

Table 4

Table 4. Troubleshooting Internal Arcing

Possible Causes:

Cures:

Physical damage to transmission

line, feedline, or radiators.Dam-

age may have been caused by

ice, lightning, tower work, or

many other factors.
Damage may cause arcing

directly or by allowing water

inside the system.

Locate the damage. Replace dam-

aged components.
Purge the system after repair, in

accordance with

Purging the Sys-

tem

on page 16.

Missing or misaligned O-ring, if

the system has been opened re-

cently.

Locate the O-ring leak, using soap

solution. Replace the O-ring if

damaged.

Loss of pressurization.

Locate the leak. Re-purge in accor-

dance with

Purging the System

page 16 and restore pressurization.

Содержание 6017

Страница 1: ...FM Broadband Multistation Broadcast Antenna Model 6017 Instruction Manual Installation Operation Maintenance ...

Страница 2: ...ents Our technical staff has a wealth of experience in the broadcast indus try 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 troubleshooting and maintenance information to keep it working satis factorily for years to come Please have everyone involved with the ante...

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: ...stalling the Power Divider to Radiator Cables 11 Installing the Main Power Divider if applicable 12 Installing the Main Feed Cables 12 Chapter 5 Pressurization and Startup 14 Before Beginning Pressurization 14 Pressurization Procedure 14 Step 1 Leak Testing 14 Step 2 Purging the System 16 Step 3 Leaving the System Pressurized 17 Before Beginning Intial Characterization 17 Initial Characterization ...

Страница 6: ...er Divider Mount Styles 6 Figure 4 Radiator Installation top view 9 Figure 5 Feedline Flange Detail 10 Figure 6 Flange Bolt Tightening Sequences 12 Figure 7 Pressurized Gas Schematic 15 List of Tables Table 1 Minimum Bending Radii Semiflex Coax 10 Table 2 Torque Specifications Flange Bolts 11 Table 3 Volume of Coax per 1000 Feet of Length 17 Table 4 Troubleshooting Internal Arcing 22 Table 5 Troub...

Страница 7: ...ll be much more time consuming if the components get wet Unpacking a Find Box 1 it is marked Open This Box First It contains the trans former and two copies of the installation drawing The parts list on one sheet of the installation drawing shows what box each item is in b Then open the boxes and examine for shipping damages File any necessary claims with the carrier immediately c If all the boxes...

Страница 8: ...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 particular attention to Frequency of the antenna Fit of the mounts to the tower members Freedom from interference by gussets leg flanges guys and their attachment points tower face members obstruction lights and other components ...

Страница 9: ...e Mounting Pole a Starting at the top of the antenna use a steel measuring tape to find the location of each mount in accordance with the installation draw ing Mark the mount locations on the pole b Also mark the location on the pole of any accessory mounts such as for the power dividers or special coax line sections to make sure they will fit as planned c If any problems appear during this proces...

Страница 10: ... 4 way power divider mounts according to Fig ure 2 on page 5 your installation drawing and the following guide lines a Find the marked locations on the mounting pole where the power divider mounts will be located b Referring to the installation drawing mark the locations of the power divider mounts generally there will be either two or four mounts per power divider CAUTION If you don t get good el...

Страница 11: ...5 Installing the Mounts not to scale Figure 2 4 Way Power Divider Installation top and side views ...

Страница 12: ...ore than one level a main power divider will dis tribute the signal among the 4 way power dividers at each antenna level Assemble and install the main power divider mounts according to Figure 3 your installation drawing and the following guidelines not to scale Figure 3 Main Power Divider Mount Styles ...

Страница 13: ...on t get good electrical contact between the mounts and the pole the antenna may not perform as designed and may pro duce stray signals that will interfere with other services on the tower c To ensure good electrical contact between the mounts and the sup port pole scrape the pole paint away at the power divider mount locations d Use band clamps to attach the power divider mounts loosely to the po...

Страница 14: ...eather NOTE Keep the plastic protectors in case you ever need to return com ponents for repair CAUTION Do not use silicone grease on an O ring as this will soften the sil icone O ring Use only a light lubricating coat of petroleum jelly provided too much may hamper electrical contact and contami nate the interior of the system Be sure the O ring is properly seated in its groove and not pinched bet...

Страница 15: ... Dividers Assemble and install the power dividers and their mounts according to your installation drawing and the following guidelines a Check the mount locations against your installation drawing b Attach the power dividers to the mounts as shown in Figure 2 on page 5 c Double check the tightness of all components ...

Страница 16: ...ee Table 1 for the various sizes CAUTION Stressing a coax connection after assembly can detune the sys tem Therefore never make a connection and then bend or twist the cable Likewise do not use the connector and flange to force the coax into shape Form the coax to the desired shape before attaching it and align the connection properly then make the connection Table 1 Minimum Bending Radii Semiflex...

Страница 17: ...ry careful to connect each power divider port to the correct radiator CAUTION The specific lengths of your flex cables are required to maintain proper system phasing Often cables will be longer than needed merely to reach the antenna inputs This is normal and necessary a Remove the plastic protector from the coax flange Don t lose the hardware or the O ring b Lubricate the O ring lightly and inser...

Страница 18: ...rew housings over the saddles not against the power dividers c As each feedline section is lifted into place remove the plastic bags and protective covers from the flanges and install an O ring lubricat ing it with a light coat of petroleum jelly provided with the antenna d Secure each feedline section to its mount before installing the next section Installing the Main Feed Cables A main feed cabl...

Страница 19: ...cal destruction of the coaxial system including the transmitter output network CAUTION You must blow dry gas through the system not just maintain a pressure The gas volume accomplishes the purge CAUTION Never operate the antenna system without proper purging and constant positive dry gas pressure CAUTION Although initial characterization is at your discretion we strongly recommend it as the best w...

Страница 20: ... temperature again and use the formula in the sidebar to obtain a corrected pres sure for comparison e If the system loses pressure at an unacceptably high rate re pres surize it leaving the gas supply on A rule of thumb is that the final pressure should not be less than half the initial pressure after twenty four hours Pressure Correction where PC corrected final pressure psig PR final pressure a...

Страница 21: ...ower the pressure and the valve will close Purge your system as follows a Determine how wet the system is If a system of rigid line carefully protected from weather and assembled in dry weather is average a system exposed to moisture during storage or installation will be rel atively wet New semi flex transmission line delivered pressurized with dry gas will be relatively dry used semi flex will b...

Страница 22: ...erely maintain a pressure the gas volume accomplishes the purge Step 3 Leaving the System Pressurized After completion of the purge reduce the supply pressure to about 5 to 7 psig allowing the pressure relief valve to close and seal the system After the pressure has stabilized keep careful note of cylinder pres sure or compressor dehydrator running time to be sure that no large leaks have been ove...

Страница 23: ...sive radia tion exposure to the person doing the adjusting CAUTION A high transmission line VSWR may indicate damaged transmis sion line and is likely to cause problems in the future including serious damage to your equipment Initial Characterization recommended Should any problems arise later with your antenna it will be extremely helpful to know what the system s characteristics were when it was...

Страница 24: ...the rigger detune each radiator in turn The simplest way to detune a radiator is to short across the wings or dipole arms for instance with a screwdriver or wrench Each time a deflection in VSWR should be apparent The deflection for various bays should be similar but not necessarily identical If the VSWR of the array does not change when a radiator is detuned that bay is not functioning Check to b...

Страница 25: ...g properly bring it up to full power Take initial readings and repeat the readings peri odically Performance readings should not change and there should be no evi dence of heating in the antenna system If any problem is found fix it now Call Shively Labs if you need help or advice ...

Страница 26: ...that it cannot be turned on accidentally CAUTION Never operate the antenna system without proper purging and constant positive dry gas pressure Shively Labs will not accept responsibility for antenna failure after operation without proper purging or positive pressure of dry air or dry nitrogen The Antenna Once the antenna has been installed and tested according to this man ual simply apply the tra...

Страница 27: ...system including the transmitter CAUTION VSWR does not change of its own accord If you find you must repeatedly readjust the transformer 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 following table Internal Arcing Look for the cause of internal arcing in Table 4 Table 4 Troubl...

Страница 28: ...r sales representa tive at Shively Labs Split bullet in the transmission line or in the baymount see Figure 5 on page 10 A split bullet is an inner conductor connector misaligned such that one or more of its contact arms is stuck outside the conductor in stead of inside A missing bullet will cause infinite VSWR Replace the inner conductor connector It may also be nec essary to replace the inner co...

Страница 29: ...ges and troubleshoot in accordance with High VSWR at Startup or during Operation on page 23 It is important to recognize however that apparent changes in cover age may be due to subjective factors or faults of the receiving equip ment 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 pressu...

Страница 30: ...shooting Mechanical damage to cables power dividers or radiators Check for leaks using soap solu tion Replace damaged components Table 6 Troubleshooting Pressure Loss or Excessive Gas Usage Possible Causes Cures ...

Страница 31: ...et the weight of the radiator hang on the cable This will damage the connector and possibly the inner conductor Support the weight of the radiator until the mount bolts are tightened CAUTION Do not use silicone grease on an O ring as this will soften the sil icone O ring Use only a light lubricating coat of petroleum jelly provided too much may hamper electrical contact and contami nate the interi...

Страница 32: ...other ice prevention coatings It is not necessary to paint the coax and power dividers although no harm will result from doing so Troubleshooting Troubleshoot the antenna system as described in Chapter 7 Return Policy When returning any material to the factory be sure to call your sales man and obtain an authorized return AR number first Use this num ber in all correspondence This number helps us ...

Страница 33: ...28 Maintenance Sample Maintenance Log DATE VSWR GAS PRESS OBSERVATIONS Visual Inspection of Antenna Obstruction Lighting Hard ware Checked Tower Repairs Accomplished etc ...

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