Fleetwood Group Inc ACS-TX216 Manuale Utente
Fleetwood Group Inc. FCC ID: FBR-ACS-TX216 User Manual Page 3 of 6
File Name: ACSMAN.DOC Date: 04/20/99
File Name: ACSMAN.DOC Date: 04/20/99
The Receive Antennas and Amplifier/Splitter are designed for compatibility.
Together they provide:
Together they provide:
•
Interference rejection
•
Greatly increased range (with or without advantaged antenna locations; see
Section 2)
•
Tolerance to very long cables (that may have high loss)
2.0 System Arrangement and Range
This Section discusses the factors that effect system range and how to optimize
range.
range.
2.1 Range Factors
The Reply ® and Reply DL® systems are designed to operate within legal
transmit power limits. The legal limits are established to allow co-existence of
many types of radio systems. However, when the transmit power is limited the
system’s useful range may only be extended by:
1. Improving the receiver sensitivity or
2. Reducing the path loss between transmitted and receiver
transmit power limits. The legal limits are established to allow co-existence of
many types of radio systems. However, when the transmit power is limited the
system’s useful range may only be extended by:
1. Improving the receiver sensitivity or
2. Reducing the path loss between transmitted and receiver
The ACS provides improved receiver sensitivity and facilitates lower path loss by
making it easier to set the interface (base) antennas in
advantaged locations.
2.2 Advantaged Antenna Locations
There are several useful ‘rules of thumb’ for evaluating a proposed antenna
location:
location:
Rule 1: Path loss increases by only a factor of 4 each time the range is doubled
as long as there is a direct, unobstructed line-of-sight path between the keypad
and interface antenna.
as long as there is a direct, unobstructed line-of-sight path between the keypad
and interface antenna.
This is called a Line-of-Sight (LOS) link. A LOS link is the
best that you can achieve and the ACS will give better than 1000 foot* range in
an LOS arrangement.
an LOS arrangement.
Rule2: Path loss increases by a factor of about 10 each time the range is doubled
if there are a lot of obstructions between the keypad and interface.
if there are a lot of obstructions between the keypad and interface.
This is called
a complex environment. Depending on how complex, the ACS will give 100 to
300 foot range.
300 foot range.
Rule 3: Path loss decreases by a factor of 4 each time the interface (base)
antenna height is doubled.
antenna height is doubled.
This applies until a LOS path is achieved, then there
is no more improvement.