CAUTION
Improperly installed feedlines can be damaged from wind, ice, arcing or inadvertently damged by climbers.
e. DO NOT COIL any excess cable. Dress up any excess cable and tie-wrap it to the tower leg, as shown in Figure 4, to
prevent wind damage to the cable or the antenna. When feasible, route the cables to take advantage of shielding
from tower members to minimize added windload.
NOTE
The Model 6020-1 does not require pressurization or purging. However, it is recommended that all multi-bay
antenna systems be pressurized.
Startup
When all personnel are clear of the tower, apply a low-power signal to the antenna and read the VSWR. The VSWR
should be below 1.3 : 1. If it is not, call Shively and speak with a designer or Sales.
Operation
Once the antenna has been installed and VSWR has been confirmed, simply apply the transmitter signal. Don’t exceed
the rated power of the antenna.
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, especially the feed strap on each antenna.
•
Incorrect assembly. Is a radiator upside-down, or the bay spacing not as shown in the installation drawing?
•
Paint 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 subjective factors or faults of the receiving
equipment. Before doing more than checking the VSWR, be sure that an actual coverage change has occurred.
Maintenance Recommendations
DANGER!
Whenever personnel are 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 performance notes and maintenance history
for your antenna. Such a log 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 gen-
eral 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 mate-
rial authorization (RMA) number first. Your material may not be recognized and may be refused if you don’t do this.
Summary of Contents for 6020
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