User's Manual

CHAPTER 4
ANTENNAS
Revised: 10 May 01 4-2
ANTENNA AND CABLE
CONFIGURATIONS
EST offers three (3) different types of antennas for both
indoor and outdoor configurations.
Part Number: AA01S
Omni Directional Rubber Duck Antenna.
Unity Gain
Part Number: AA20S
Omni Directional Building Mount Antenna
5 dB gain
Part Number: AA202S
Directional Building Mount Antenna
13.9 dB gain
Outdoor Fixed Base Configuration
Lightning Protection
50’ Heliax Cable
Indoor Configuration
25’ RG-8 Cable
Note: The cables and antennas are optimized with the
ESTeem for maximum output power allowed by
the FCC and IC.
Extreme care must be taken when attaching
coax connectors to the antenna feedlines.
If there is any error in making this
connection the output of the transmitter will
be greatly reduced.
COAXIAL CABLES
To minimize signal loss, the overall length of the coaxial
cable should be as short as possible. To avoid corrosion
select coaxial cable manufacturers with tinned copper
braid, where possible. Listed below are representative
cable losses in db/100 ft at the 2.4 GHz frequency range:
Frequency (GHz) RG-8 ½” Heliax
---------------------------------------------------------------------
2.400-2.462 - 8.0 - 3.74
In a severe noise environment it may be desirable to use a
double shield type of coax cable such as RG-214/U in
place of the RG-8.
Note: Pre-made coax cables can be purchased from
the factory. A -3 dB loss means you have lost
1/2 of your signal. A +3 dB gain means you
have doubled (x2) your signal.
WEATHER PROOFING COAX
CONNECTIONS
1. Coat the threads of the connectors with silicone
lubricant prior to assembly (See Note 1) and hand
tighten. Care should be taken not to get any
lubricant on the center conductor.
2. Wrap the connector assembly with a vapor barrier
patch for weather proofing (See Note 2), ensuring to
overlap onto the coax cable approximately 1 1/2
inches.
3. Apply an electrical coating (sealing agent) over the
vapor barrier patch for added protection (See Note
3).
Notes:
1. Dow Corning RTV-3140 or equivalent.
2. Suggested vendors:
VAPOR-WRAP
Decibel Products
3184 Quebec St.
Dallas, TX 75356
214-631-0310