Avalon RF TX518 Manuale utente
Avalon RF, Inc. • 344 Coogan Way • El Cajon, CA 92020
TX518/TX523/TX530
L-Band Video Transmitters
User's Guide & Operating Manual
REV. A - 15 Aug 2007
http://www.avalonrf.com/
AVALON RF, INC. Page ii
TX500 Series User’s Guide & Operating Manual
RF EXPOSURE INFORMATION
Maximum Permissible Exposure
Any Wireless Equipment can pose health hazards if precaution is not
exercised in its use/operation, especially its proximity to the human body.
Excessive absorption of RF energy in the body is known to cause Cancer
and/or other diseases. The FCC has issued guidelines to determine the
safe distance of a transmitting antenna from the human body, to limit
absorption to safe levels. Please follow the instructions given in this
manual.
WARNING: Refer to Table 4 in Section 3 (Operating the transmitter) to
determine the MINIMUM DISTANCE the Transmitter with Antenna
mounted, or the Antenna itself (if connected via coax to the transmitter),
must be placed away from the body to minimize the health hazard. Also,
note the Warning for TX530 after Table 4.
AVALON RF, INC. Page iii
TX500 Series User’s Guide & Operating Manual
Table of Contents
1.
General................................................................................................1
Table 1 – Model/Output Power ............................................................1
Figure A – TX500 Series Controls and Connectors..............................3
Video...................................................................................................4
Audio...................................................................................................4
Talk Back Audio Channel (Optional)....................................................4
Two Way Digital Data Link (DDL) (Optional)........................................4
RF Outputs..........................................................................................4
2.
Specifications.......................................................................................5
User Interface......................................................................................5
Setup...................................................................................................5
Electrical Interface...............................................................................6
Table 2 – Current Consumption...........................................................6
Table 3 – Power Output.......................................................................7
Interconnecting....................................................................................9
Figure B – DB 15.................................................................................9
Mounting............................................................................................10
Mechanical Data................................................................................11
Environmental Conditions..................................................................12
3.
Operating the transmitter. ..................................................................13
Operater Controls & Indicators...........................................................13
General Guidelines............................................................................14
Table 4 – Minimum Safe Distance.....................................................15
4.
Ordering information..........................................................................16
Base Models......................................................................................16
Options..............................................................................................17
Recommended Accessories..............................................................18
Antennas........................................................................................18
Cables............................................................................................19
Battery Packs.................................................................................19
Warranty............................................................................................20
AVALON RF, INC. Page 1
TX500 Series User’s Guide & Operating Manual
1. General
The TX500 series rugged transmitters are intended for use in military,
homeland security, mobile security, broadcasting and motion picture
production.
The TX500 Series is an FM modulated transmitter with a tuning range
that is model dependent. See table below for frequency ranges.
Model Frequency Range
TX5XX-00 900-1100 MHz
TX5XX-01 1100-1300 MHz
TX5XX-02 1300-1600 MHz
TX5XX-03 1600-1900 MHz
TX5XX-04 1900-2200 MHz
The following table details the RF output power of the various models:
Model Output Power
TX518 70mW
TX523 200mW
TX530 900mW
Table 1 – Model/Output Power
The Transmitter connector is a high density DB-15.
AVALON RF, INC. Page 2
TX500 Series User’s Guide & Operating Manual
All transmitters offer the following features:
• A single broadcast quality video channel with no delay.
• One/Two (optional) broadcast quality audio channel/s
Optional features (each ordered individually).
• Two-way Wireless Data Link (WDL) to a DX series receiver.
• Talk back audio channel.
• Alarm/Motion sensor interface.
• Telemetry inputs.
AVALON RF, INC. Page 3
TX500 Series User’s Guide & Operating Manual
Top View
1 Power Switch
2 WDL Antenna
3 Main Antenna
Bottom View – Broadcast
4 Power/Video Input – see Figure C
5 Data Input – see Figures F
6 Video Input – see Figure D
7 Audio Input – see Figure E
Bottom View – Security
8 Power/Video Input – see Figure B
Side Views
9 Power LED Indicator
10 Channel Select Dip Switch
Figure A – TX500 Series Controls and Connectors
AVALON RF, INC. Page 4
TX500 Series User’s Guide & Operating Manual
1.1 Video.
The video input is buffered, combined with the audio subcarrier/s,
then DC level restored, limited by a white level clipping circuit, pre-
emphasized and FM modulates the transmitter RF carrier.
Avalon RF offers the following video indices of modulation:
• Industry standard frequency deviation of 2MHz.
Compatible to GMS, L3 and others.
• Wide frequency deviation of 4MHz.
1.2 Audio.
The audio input/s are buffered and FM modulated on subcarrier/s.
The factory preset subcarrier frequency is 6.5MHz but can be factory
programmed to any frequency from 5MHz to 7.5MHz. The
subcarrier/s is synthesized.
1.3 Talk Back Audio Channel (optional).
The talk back audio channel allows the camera operator (on the
transmit side) to receive instructions from the operator at the
receiver’s side. It drives an earpiece.
1.4 Two Way Wireless Digital Link (WDL) (optional).
The WDL serves as a Pan-Tilt-Zoom (PTZ) / general-purpose two-
way RS422/RS485 digital link.
1.5 RF Outputs.
The transmitters have two RF outputs (Only 1 for a standard unit,
without WDL or Talk Back Audio Option). A female SMA connector
for the main transmitter and a MCX for the WDL.
Both outputs feed antennas, either directly or through a cable.
AVALON RF, INC. Page 5
TX500 Series User’s Guide & Operating Manual
2. Specifications
2.1 User Interface.
a) On/Off Switch.
The TX500 series transmitter has an on/off switch. This shuts off
power to the entire transmitter.
b) Power on LED.
This LED has the following states:
i) Green when power in on (only applicable for WDL).
ii) Red when the transmitter is on air.
c) Hands Free Back Channel (optional).
This option allows the receiver operator to communicate with the
transmitter operator via a headset that includes an earpiece and a
microphone, when the transmitter is on air.
2.2 Setup.
The TX500 series transmitters have the following setups:
a) Video/Main RF carrier frequency (0.9GHz to 2.2GHz(*)).
b) Audio 1 sub-carrier frequency (5MHz to 6MHz).
c) Audio 2 sub-carrier frequency (6MHz to 7.5MHz).
(*) Model dependent
AVALON RF, INC. Page 6
TX500 Series User’s Guide & Operating Manual
2.3 Electrical Interface.
The transmitter has the following interfaces:
2.3.1 Power Input
a) The transmitters operate off a 9Vdc-16Vdc unregulated voltage
source.
This input is switched and protected against reverse polarity.
a) Typical power input current consumption for the basic
configuration is (with video present):
Model Input Current
TX518 <200mA
TX523 350mA
TX530 450mA
Table 2 – Current Consumption
‘Video Presence’ detection circuitry will turn off the power amplifier
if no video is detected. This conserves power considerably and
reduces the RF output by more than 30 dB (1000 times less), if no
video is present.
Addition of option 11 (WDL) will increase the current draw by
about 200mA.
2.3.2 Video Input.
a) The video input accepts RS170, CCIR, NTSC or PAL signals.
b) Input voltage is 1Vp.p with a negative sync tip of 0.3V.
c) The input impedance is 75
Ω
ΩΩ
Ω
(ohm).
2.3.3 Audio 1 and Audio 2 Inputs.
The audio inputs accept signals of 1Vp.p. and have an input
impedance of 600
Ω
ΩΩ
Ω
(ohm).
AVALON RF, INC. Page 7
TX500 Series User’s Guide & Operating Manual
2.3.4 "Talk back" audio channel to the transmitter operator (optional).
The “talk back” output drives an electromagnetic earpiece.
2.3.5 Two Way Wireless Digital Link (WDL) (Option 11)
The WDL is a 9.6KBaud (standard, other Baud rates upto 56K are
supported) Half-Duplex RS485 compatible serial interface.
2.3.6 Main RF output to antenna.
a) The main RF output connector is a 50
Ω
ΩΩ
Ω
(ohm) female SMA
receptacle.
b) The RF output power is as follows:
Model
Output Power
TX518
70mW at VSWR of 1.5:1
TX523
200mW at VSWR of 1.5:1
TX530
900mW at VSWR of 1.5:1
Table 3 – Power Output
2.3.8 Wireless Digital Link (WDL) RF output.
The WDL RF output is via a 50 Ω(ohm) MCX connector. Maximum
output power is +24 dBm.
The main RF and the WDL RF outputs are identical on all the
transmitter versions.
2.3.9 Alarm/Motion Sensor input (optional – Security Type Only).
The Alarm/Motion Sensor input is an interface to a dry contact relay.
Whenever the relay circuit is closed, the transmitter goes on air.
2.3.10 Telemetry inputs (optional).
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