Installing a Model 6020-1 FM antenna

Installing a Model 6020-1 FM antenna
Shively Labs
Installing a Model 6020 FM Antenna
Installation of the Shively Labs Model 6020 antenna is
straightforward. This instruction sheet contains all the information you will need. If you have any problems, call Shively
and talk with your Sales representative.
Check shipment.
Before beginning, be sure to check your shipment to be sure
all the parts are there. The parts are listed on the installation drawing.
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.
Figure 1.
Model 6020 FM antenna
Do not overtighten hardware and flange connections.
Overtightening them may damage components or affect
your signal. See Table 1 below.
Do not alter the length of the boom from the mounting
pole to the arms. Doing so will affect tuning and antenna
a. Lay the system out on the ground and verify fit of antenna, mounting brackets and feed system components.
Inspect connection points for damage.
b. Mark the outrigged pole at the location where the antenna(s) will be mounted, in accordance with the installation
drawing. Watch for tower components that might interfere with your installation. Verify this location is free of tower
paint and that a good ground contact will be made between the mount and the tower.
c. Mount the antenna bay on the pole at the location you marked (step b).
Semiflex cable has a minimum bending radius, specified by the manufacturer. Bending it too sharply will damage
the cable. See Shively Labs technical bulletin "tb-coax installation" for installation guidelines.
d. Be sure the tower transmission cable flange contains an inner conductor connector. Install an O-ring in the flange,
Carefully insert the inner conductor connector into the inner conductor in the antenna, then attach the cable flange to
the flange at the rear of the antenna bay as shown in the installation drawing. Tighten the flange bolts to the torque
specifications shown in Table 1.
Table 1. Torque Specifications
Bolt Size
Bolt Size
6 mm
5 ft-lb (7.7 N-m)
12 mm
35 ft-lb (47 N-m)
8 mm
14 ft-lb (18.7 N-m)
Document No. ts-6020_installation (161031)
A Division of Howell Laboratories, Inc., P. O. Box 389, Bridgton, Maine 04009 USA
(207) 647-3327
An Employee-Owned Company
Fax: (207)647-8273
Certified to ISO-9001
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.
The Model 6020-1 does not require pressurization or purging. However, it is recommended that all multi-bay
antenna systems be pressurized.
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.
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.
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
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 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 material authorization (RMA) number first. Your material may not be recognized and may be refused if you don’t do this.
Figure 2. Top view
Figure 3. Single-Bay Installation
Figure 4. Multi-Bay Installation
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