TELEWAVE 44A Manual de usuario
Model 44A/AP
BROADBAND RF
WATT METER
OPERATION MANUAL
®
Telewave, Inc.
Model 44A/AP
Page 1
MODEL 44A/AP BROADBAND RF WATTMETER
DESCRIPTION AND OPERATION
CONTENTS PAGE
1. SPECIFICATIONS 2
2. GENERAL DESCRIPTION 3
3. PHYSICAL DESCRIPTION 5
4. FUNCTIONAL DESCRIPTION
Schematic and Parts List 6
Functional Description 7
Accessory List 8
5. OPERATION
Unpacking and Connections 9
Power Measurements 10
VSWR Calculations 11
True Power at Load Calculation 11
Directivity and Insertion Error 12
6. MAINTENANCE
Warranty Service and Calibration 13
Parts Location 14
Calibration / Adjustment Procedure 15
7. REFERENCE
VSWR Nomograph 17
Low Frequency Correction Chart 18
Jumper Cable Cutting Chart 19
Telewave, Inc. • 660 Giguere Court • San Jose, CA 95133
1-800-331-3396 • 408-929-4400 • www.telewave.com
TWDS-8007 Rev. 9/08 • All Contents © 2008 Telewave, Inc.
Telewave, Inc.
Model 44A/AP
Page 2
1 SPECIFICATIONS
1.01 Table 1-1 lists specifications for the Telewave Model 44A/AP
Broadband RF Wattmeter. These are provided to assist the user in
formulating acceptance criteria, determining applications, and for
periodic recalibration of the instrument. Minor deviations from
these specifications which do not affect performance of the Model
44A/AP Wattmeter should not be considered a warranty issue.
Table 1-1: Model 44A/AP RFWattmeter Specifications
Parameter Characteristics
Frequency Range
Accuracy
20 to 150 MHz
150 to 1000 MHz
20 to 1000 MHz
(Specified with N connectors only)
± 6 percent with Figure 7-2 curve.
± 6 percent
(Accuracy specified at 80% of full scale
after application of correction factor if any)
Power Ranges 5, 15, 50, 150 and 500 Watts
Primary Line Impedance
VSWR
Insertion Loss
50 Ohms nominal
1.1 maximum
0.1 dB maximum
RF Sample Port (44AP) -40 dB +/- 2 dB
RF Connectors
Standard
Optional
QC - “Quick-Change” type
N-Female
UHF, BNC, TNC, 7-16 DIN M/F
Note: UHF connectors reduce measurement
accuracy in the 400 to 1000 MHz range.
Dimensions
Height
Width
Depth
Weight
6.625 in. (16.83 cm)
4 in. (10.16 cm)
3.25 in. (8.26 cm)
3 lbs. (1.36 kg)
Telewave, Inc.
Model 44A/AP
Page 3
2 GENERAL DESCRIPTION
2.01 This manual provides the physical and functional description and
operating theory necessary for effective use of the Telewave Model
44A/AP Broadband Radio Frequency (RF) Wattmeter. Its features
include:
• Displays five power ranges
• Measures 1 to 500 watts
• Does not require inserts
• Does not require band switching
• Fully operable in freezing conditions
• Provides 5 watts full scale range
• Interchangeable connectors (QC)
• Lighweight, rugged and easy to carry
• -40 dB RF sampling port (Model 44AP)
2.02 The instrument integrates two broadband directional couplers for
measuring incident and reflected power, ranging, calibration and
display. The wide coverage and dynamic range of this instrument
eliminates any inserts or band switching. A 20 uA taut band me-
ter movement is used to display the measured power, providing the
measurement accuracy necessary to tune low power portable trans-
mitters.
2.03 A convenient, easy to read, voltage standing wave ratio (VSWR)
chart is provided on the rear of the instrument for determining
VSWR from the measured incident and reflected power levels. The
instrument is designed for rugged field use and is housed in a diecast
metal case with a leather carrying strap. The measurement circuits
in the wattmeter are driven directly by the current developed in the
coupler, making it unnecessary to supply AC power or batteries. A
carrying case (Model TC44) is available as an option. The Model
44A/AP is ideally suited for mobile, marine, and aircraft applica-
tions as well as base stations.
Telewave, Inc.
Model 44A/AP
Page 4
1
8
7
6
5
4
3
2
9
Figure 2-1: Model 44A/AP
Broadband RF Wattmeter
Controls and Indicators
10
Telewave, Inc.
Model 44A/AP
Page 5
3 PHYSICAL DESCRIPTION
3.01 The controls and indicators of the Model 44A/AP Broadband RF
Wattmeter are illustrated in Figure 2-1, and the functions of these
elements are described in Table 3-1.
Key Item Description
1 Carry Strap For carrying or hanging the instrument.
2 Identification Label Contains model and serial number of the
instrument.
3 Meter Displays measured power.
4 Sample Port Connection point for external measure-
ment or signal injection (Model 44AP).
5 Input Connector
Connection point for the RF source, such
as an RF power amplifier or transmitter.
Mates with Type N or UHF connector
(typical).
6 Output Connector
Connection for the RF load, such as an an-
tenna or dummy load. Mates with Type N
or UHF connector (typ.)
7 Mode Switch
(1) OFF – Transit. Provides protection
for meter during instrument
movement.
(2) FWD – Displays forward or incident
power.
(3) REV – Displays the reflected power.
8 Power Range Switch Selects one of 5 full scale power ranges.
9 VSWR Chart
Provides a method to calculate VSWR
from the measured forward and reflected
power.
10 Correction Factor
Provides a method to determine the scale
correction for measurements below 150
MHz.
Table 3-1 : Model 44A/AP Description
Telewave, Inc.
Model 44A/AP
Page 6
Figure 3-1: Model 44A/APRF Wattmeter Schematic
R2
R16
R12
R8
R4
R15
R11
R7
R3
R18
R17
R14
R13
R10
R9
R6
R5
S1
S2
OFF
REVFWD
M1
+-
500
150
50
15
5
500
150
50
15
5
RF
SOURCE RF
LOAD
Dual Directional Coupler
R1
JP JP
CU1 CU2
Table 3-2 : Model 44A/AP Parts List
REF DESCRIPTION MFG MFG P/N
CU1,2 COUPLER HEAD ASSEMBLY TELEWAVE 7988
M1 METER: 20 UA TRIPLETT 7034
MP1 KNOB RAYTHEON MS-91528-1P2B
MP2 SCREW: BUMPER 6-32 TELEWAVE TB44
MP6 STRAP: LEATHER TELEWAVE HH44
MP8 SCREW: TRUSS HEAD 10-52 ICO/RALLY SCR-813
MP9 SHOCK RING: EDM TELEWAVE 7099
QC N FEMALE CONNECTOR TELEWAVE QC44N
QC UHF FEMALE CONNECTOR TELEWAVE QC44S
QC BNC FEMALE CONNECTOR TELEWAVE QC44B
QC TNC FEMALE CONNECTOR TELEWAVE QC44T
QC 7-16 DIN FEMALE CONNECTOR TELEWAVE QC44D
R1 RESISTOR: VAR CC 0.25W 10/% 2.5K OHM
R2 RESISTOR: VAR CC 0.25W 10/% 2.5K OHM
R3 RESISTOR: VAR CC 0.25W 10/% 10K OHM
R4 RESISTOR: FXD CC 0.50W 5/% 1.8K OHM
R5 RESISTOR: FXD CC 0.50W 5/% 1.8K OHM
R6 RESISTOR: VAR CC 0.25W 10/% 10K OHM
R7 RESISTOR: VAR CC 0.25W 10/% 25K OHM
R8 RESISTOR: FXD CC 0.50W 5/% 13K OHM
R9 RESISTOR: FXD CC 0.50W 5/% 13K OHM
R10 RESISTOR: VAR CC 0.25W 10/% 25K OHM
R11 RESISTOR: VAR CC 0.25W 10/% 25K OHM
R12 RESISTOR: FXD CC 0.50W 5/% 30K OHM
R13 RESISTOR: FXD CC 0.50W 5/% 30K OHM
R14 RESISTOR: VAR CC 0.25W 10/% 25K OHM
R15 RESISTOR: VAR CC 0.25W 10/% 25K OHM
R16 RESISTOR: FXD CC 0.50W 5/% 62K OHM
R17 RESISTOR: FXD CC 0.50W 5/% 62K OHM
R18 RESISTOR: VAR CC 0.25W 10/% 25K OHM
S1,2 SWITCH: ROTARY 2 POLE 5 POS ELECTROSWITCH D3G0205N-4096
Telewave, Inc.
Model 44A/AP
Page 7
4 FUNCTIONAL DESCRIPTION
4.01 The Model 44A/AP Wattmeter is made up of two major sections.
Refer to the schematic diagram in Figure 3-1 for this description.
(a) A Dual RF Directional Coupler with directivity of greater than
25 dB.
(b) A voltmeter circuit. Five ranges are provided.
4.02 The 50 ohm Dual Directional Coupler A1 samples a small amount
of the incident or forward RF power delivered to the load. The cou-
pler incorporates two RF detectors which produce a DC voltage
proportional to the sampled RF power. A small amount of power
reflected from the load is also sampled.
4.03 Mode Switch S1 determines which of these voltages is displayed on
the meter, M1. The RF Power Range Switch S2, selects the appro-
priate range and calibration resistors for the power to be measured.
Each range is provided with an adjustable internal potentiometer for
range calibration.
4.04 Meter M1 displays five scales which correspond to the RF Power
Range Switch positions. The lower third of the meter scale is shaded
red, alerting the user to switch to a lower power range for full instru-
ment accuracy. An OFF position is provided on Mode Switch S1,
which shunts out the meter movement. This provides protection for
the sensitive meter when the instrument is being transported.
4.05 Model 44AP provides an RF sampling port with an output of -40 dB
(+/- 2 dB) below the transitional line level to use for measurement
of frequency, spectrum analysis, to inject a signal for measurement
of receiver sensitivity, or other applications. The port coupling is
not directional; in a high VSWR system, the sampling port output
will be -40 dB below the total power passing through the instru-
ment.
Telewave, Inc.
Model 44A/AP
Page 8
Part Number Description
TC44 Leather carry case with accessory pouch
TWL-35 Coaxial Dry Load - 35 watts
TWL-50 Coaxial Dry Load - 50 watts
TWL-60 Coaxial Dry Load - 60 watts
TWL-75 Coaxial Dry Load - 75 watts
TWL-100 Coaxial Dry Load - 100 watts
TWL-150 Coaxial Dry Bench Load - 150 watts
TWL-300 Coaxial Dry Bench Load - 300 watts
QC44B Quick Change BNC-female connector
QC44D Quick Change 7-16 DIN-female connector
QC44N Quick Change N-female connector
QC44S Quick Change UHF-female connector
QC44T Quick Change TNC-female connector
ANTA-02-5 Jumper - RG-213/U, 5 ft., N-Male
ANTD-03-5 Jumper - RG-142B/U, 5 ft., N-Male
Figure 4-1: Model 44APWattmeter with Optional
TC44 Carrying Case, RF Loads
Optional Accessories
4.06 The table below lists the most common accessories for the Model
44A/AP Wattmeter. Consult the current price list or our website
for current pricing.
Telewave, Inc.
Model 44A/AP
Page 9
5 OPERATION
Unpacking
5.01 After the Model 44A/AP Wattmeter arrives, examine the shipping
container for visible loss or damage. Carefully unpack the watt-
meter and examine the exterior for damage.
IMPORTANT
The Model 44A/AP Wattmeter is carefully tested, inspected, and
packed before leaving the Telewave factory. Claims for loss or
damage sustained in transit should be made upon the carrier,
NOT TO Telewave, Inc., as follows:
(1) Visible Loss or Damage - Any evidence must be noted on
the freight bill or express delivery sheet. The form required
to file such a claim will be supplied by the carrier.
(2) Concealed Loss or Damage - This damage does not be-
come evident until after the wattmeter is unpacked. When
the damage is discovered, make a written request for in-
spection by the carrier’s agent within fifteen (15) days of
the delivery date. File a claim with the carrier.
RF Connections
5.02 The following procedure will assist the user in preparation for
making an RF power measurement. Refer to Figure 2-1.
Step Procedure
1 Remove the RF power from the transmission line.
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