Fleetwood Group ACS-TX216 Antenna combiner and amplifier User Manual ACSMAN

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Document ID	33525
Application ID	G4LTSWlIU4p9NlEZY+Fm6Q==
Document Description	Users manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	7.97kB (99647 bits)
Date Submitted	1999-04-21 00:00:00
Date Available	1999-07-14 00:00:00
Creation Date	0000-00-00 00:00:00
Producing Software	Acrobat PDFWriter 3.02 for Windows
Document Lastmod	0000-00-00 00:00:00
Document Title	ACSMAN
Document Creator	Microsoft Word
Document Author:	Unknown

Reply Antenna Combining System (ACS)
The Reply ® ACS simplifies large installations by extending system range
and reducing the number of required antennas.
In most cases the ACS will provide 2X to 4X range improvement without any
change in the required antenna placement. When even more range is needed
the ACS simplifies antenna placement.
The ACS is designed for high reliability. It uses hi-rel and military grade
components, thermal management, and amplifier protection circuitry.
This manual describes the system and how to get the best performance.
1.0 Connecting the ACS System
Hooking up the ACS is much simpler than using a separate antenna set for each
interface.
An ACS consists of:
1. Two powered receive antennas
2. An extended range transmit antenna
3. A receive antenna amplifier/splitter unit
4. A transmit antenna combiner unit
The ACS supports up to 8 channels of Reply® and Reply DL® interface units.
1.1 Transmit Combiner Connections
Transmit Combiner connections are diagrammed in Figure 1.
ACS Transmit Combiner
Single TX Antenna
(24 Inch Long)
TX
TX
TX IN
TX
Up to 8 TX Connections from
Reply® or Reply DL®
Interface Units
TX Out
24 V DC
Power
TX
Figure 1. Connecting to the Transmit Combiner
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 1 of 6
The Transmit Combiner accepts transmitter connections from up to 8 Reply ®
interfaces and performs an arithmetic summation of each signal to provide a
single output with less then 0.1 % distortion. This output is applied to the rangeextending Transmit Antenna (24 in long). Since there is only one Transmit
Antenna, it is easy to locate in an advantaged arrangement (see Section 2).
1.2 Receive Amplifier/Splitter Connections
Receiver Amplifier/Splitter connections are diagrammed in Figure 2.
ACS Powered Receive Antennas
With Power Indicator
Right RX In
Left RX In
ACS Receive Amplifier/Splitter
Right RX
Out
Left RX
Out
RX
RX
RX
RX
RX
RX
Up to 16 RX Connections from
up to 8 Reply® or Reply DL®
Interface Units
15 V DC
Power
RX
RX
Figure 2. Connecting to the Receive Amplifier/Splitter
The Receive Amplifier/Splitter accepts connections from 2 powered antennas
and splits the RF signals for application to up to 8 Reply ® interfaces. The
powered Receive Antennas have an indicator lamp to verify continuity between
antenna and ACS. Since there are only 2 Receive Antennas, they are easily
located in an advantaged arrangement (see Section 2).
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 2 of 6
The Receive Antennas and Amplifier/Splitter are designed for compatibility.
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.
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
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:
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. 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.
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. This is called
a complex environment. Depending on how complex, the ACS will give 100 to
300 foot range.
Rule 3: Path loss decreases by a factor of 4 each time the interface (base)
antenna height is doubled. This applies until a LOS path is achieved, then there
is no more improvement.
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 3 of 6
Rule 4: Cable loss increase is insignificant compared to the potential
improvement when antenna height is increased. For all practical purposes, your
antenna can never be too high.
Rule 5: The two (diversity) receive antennas should be at least 3 feet apart. In
fact, some locations benefit from even wider spacing if a LOS path is established
from at least one of the antennas to all points in the room.
* Note: Reply keypads built after March 1999 have roughly 2X the range compared to pre3/99 units. The above ranges are based on post-3/99 units.
These rules lead to some conclusions:
a) Smaller rooms (25 to 50 ft range) can get by with antennas set just about
anywhere. See Figure 3
b) To cover medium size rooms raise the antennas up. The 6 to 8 ft level should
cover to about 100 ft, depending on how complex the environmenmt is. See
Figure 4.
c) For very large rooms the antennas should be on booms (like a MIC stand) or
set in the catwalk, etc. See Figure 5.
Possible Reply
Equipment Location
Seating Area
Figure 3 – ACS used in a Small Room
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 4 of 6
Left RX Antenna
TX Antenna
Right RX Antenna
Antennas should be elevated to 6-8 ft
Possible Reply Equipment Location
Figure 4 – ACS Used in a Medium Sized Room
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 5 of 6
Line-of-Sight to
Audience/Keypads
Antenna
Location
Stage
Figure 5 – ACS Used in a Very Large Room
Fleetwood Group Inc.
FCC ID: FBR-ACS-TX216
File Name: ACSMAN.DOC
Date: 04/20/99
User Manual
Page 6 of 6

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Create Date                     : Tuesday, April 20, 1999 1:39:43 PM
Title                           : ACSMAN
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Subject                         : ACS Users Manual

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