Coaxial Dynamics Web Wattchman User manual

Coaxial Dynamic
s
A CDI INDUSTRIES, INC. COMPANY
SPECIALISTS IN RF TEST EQUIPMENT & COMPONENTS
6800 Lake Abram Dr
Middleburg Hts., Ohio 44130
Telephone: [phone]
Fax: [phone]
Web Site: www.coaxial.com
E-mail: [e-mail]
Instruction Manual
Model 81096
Web Wattchman
Serial Number _____________
Port 1: Forward _______________ Reflected _______________
Port 2: Forward _______________ Reflected _______________
Date: ____________________ Calibrated by: _______________

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SAFETY
Personnel operating high power or high voltage
systems should use standard safety precautions at
all times. Do not attempt to disconnect systems or
replace parts while equipment is operating.
Disconnect all supply power before servicing.
WARNING
There are no user serviceable parts inside this product.
The possibility of accidental shock is present.

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MODEL 81096 SPECIFICATIONS
Meter Specifications 2-line LCD Display ±1% full scale
Controls Front Panel Push button Alarm reset
Connections RJ-45 LAN
RS-232 Serial
RelayContacts(J7)
RJ-11 (Port 1) (Port 2)
Ground stud
Fuseholder
AC power input
Contact Ratings 3 A at 120 VAC Resistive
System Accuracy ±5% full scale when used with
proper Coaxial Dynamics Line
Sections and Detecting Elements.
Power Requirements 115 / 230 VAC, 50 / 60 Hz
Lessthan2A

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INTRODUCTION
The Coaxial Dynamics Model 81096 Web Watchman is intended for use as a continuous
performance monitor and protection device for use in RF transmission systems. It is
designed to be used with 50-Ohm dual socket line sections, and will read power from two
independent line sections. The operating frequency and power range is determined by the
elements and line sections used. With the proper selection of elements it may also be used
to monitor the combined transmitter power and power to the reject load with one display unit.
The Model 81096 can be used to measure both analog and digital signals, depending on
which types of elements are used.
The forward display on the Model 81096 will indicate forward power to the load while the
system is in operation. It can be set to activate the shut down circuits if forward power
changes outside a preset range. The reflected display will indicate power reflected from the
load, and will activate the shut down circuits if power exceeds a preset level. Each channel
operates independently of each other and the alarms may be set for each system
separately.
The Model 81096 is made with high quality components. Used and maintained properly, it
will provide years of dependable service.

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SECTION 1 - INSTALLATION
1.1 Mounting
The Model 81096 is designed to be mounted in a standard 19” relay rack. Control
and input wire lengths are not critical so the unit can be mounted in a convenient
location offering easy accessibility and viewing.
When mounting, be sure to use proper grounding techniques. Interlock wiring should
be shielded and the chassis ground connection on the Watchman should be
attached to a good ground, preferably to the same ground used for the transmission
line.
Place the unit in the rack and secure with (4) four screws located in the slots
provided. The line section may be mounted in the transmission line between the
transmitter output and the antenna or between the driver and final output transmitter.
The latter provides protection in the event a malfunction in the input circuits of the
final transmitter.
The Model 81096 is designed to work with a series of specialized line sections from
7/8” to 6-1/8” and standard Coaxial Dynamics elements for either analog or digital
applications. Elements are available from 1 W to 250 kW and from 2 MHz to 1800
MHz. A typical system normally consists of a dual socket line section with the
appropriate elements for each transmission line to be monitored. Each line section
comes with a 10-foot telecommunications style cable to interface with the 81096. No
additional power supply or cabling is required at the line section other than an RF
source and load.
1.2 Connections
Connections to the Model 81096 terminal strip are as follows:
10-32 Stud Ground Stud to Station Ground
Pin #1 Remote Reset – Momentary to Ground
Pin #2 +5 VDC @ .25 A
Pin #3 System Ground
Pin #4 Common System, Control relay – common to 5 and 6
Pin #5 Common System, Control relay – N.C.
Pin #6 Common System, Control relay – N.O.
Pin #7 System 1, Control relay – common to 8 and 9
Pin #8 System 1, Control relay – N.C.
Pin #9 System 1, Control relay – N.O.
Pin #10 System 2, Control relay – common to 11 and 12
Pin #11 System 2, Control relay – N.C.
Pin #12 System 2, Control relay – N.O.

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The RJ-11 input connectors are provided for connection to the Line Sections.
AC power is applied through the fused receptacle on the rear panel. The mating power cord
is supplied. Power requirements are 115/230 VAC, 50/60 Hz.
1.3 Setup
The Model 81096 needs to be setup for the proper IP address for your system as well as the
proper element power ranges for your transmitter. The unit may be addressed using a
crossover cable connected to the Ethernet connector on the rear panel. The initial IP
address of the Model 80196 is 192.168.3.250 and the initial password is “123456”. The
password may be changed by using the RS-232 connection and a terminal program.
Connect at 19200,8-N-1 flow control should be set for Xon/Xoff and press enter to access
the set-up menu. To reset the unit to original factory settings, turn the unit off. Press
and hold the reset switch when turning the power on.
Both the forward and reflected power ranges must be set for each port to match the
elements in use. Alarm set points are then set to match the desired trip points for high and
lower power on both forward and reflected channels.
If elements are ordered with the Model 81096, the ranges will be set at the factory on
port 1 and noted on the front of this manual.

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If you are only using one port, the setting of other power ranges does not matter, but set the
“continuous transmit” to disable. This will prevent the alarm from triggering at “zero” power.
If AC power to the unit fails, the Model 81096 will maintain the proper settings in the
nonvolatile memory.
1.4 Alarm Setup
Model 81096 is equipped with an audible alarm. When a fault is detected and the system is
tripped, the alarm will sound. Terminals 4, 5 and 6 will switch if either system one or two
faults and can be used for an external alarm. These contacts are normally open and close
during a fault condition. These contacts have a rating of 2 Amps at 115 VAC. The alarms
are set using an Ethernet crossover cable.
If you do not want the alarm operational for low forward or reflected power, set the low limit
to zero. If you do not want the alarm to function on high forward or reflected power, set the
alarm to the power rating of the element.
Set the high limit on the reflected channel to above what you expect to have reflected back
from your transmitter antenna. The arrows on the elements indicate the power flow direction
sensed by each element.
1.5 Control Contacts
Three sets of control contacts are provided. They are labeled on the rear panel. Terminals 1
and 3 provide a remote reset function, terminal 2 is a 5 V supply rated at 0.5A. Terminals 4,
5 and 6 will switch if either system faults and could be used for an external alarm. Terminals
7, 8 and 9 are for the transmitter monitored by port 1; terminals 10, 11 and 12 are for the
transmitter monitored by port 2. This allows protection for combined transmitter systems or
shutdown of drive and final amplifier simultaneously.

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SECTION 2 - OPERATION
2.1 Unit Operation
Make sure all connections; adjustments and settings are correct before operation of the unit.
When RF power is present, the unit will operate as a power meter displaying both forward
and reflected power for each port, if they are connected to a line section.
If you add port 2 after the initial setup, you will need to shut down the unit and enter the
power and alarm settings before connecting the new line section cable to the Model 81096.
(See section 1.3 Setup)
When the reflected power rises above the preset level (or when forward power drops below
the preset level) the Model 81096 will sound the alarm. If the systems are connected to an
interlock circuit the protected unit will be shutdown and the display will hold the fault
condition until the unit is reset. To reset the unit, press the reset button until the display
indicates “Sending E-Mail”. Note: this resets only the Model 81096. The fault needs to
be corrected before restarting the transmitter.
2.2 Load Adjustments
If adjustment at the load is required without interruption by the Model 81096, set the alarm
points outside the range expected to be measured.

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VSWR Nomograph
1.03
1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.12 1.14 1.16 1.20
1.25
1.30
1.35
1.40
1.50
1.60
1.80
2.00
2.50
4.00
10.0
3.00
0.1 1 10 100
0.01
0.1
1
Reflected Power - Watts
Forward Power - Watts
For higher power values multiply both scales by the same decimal figure
VSWR=
FORWARDPOWER
REFLECTEDPOWER
1+
REFLECTEDPOWER
FORWARDPOWER
1-

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NOTES