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Table of Contents
Related Manuals for TELEWAVE 44A
Summary of Contents for TELEWAVE 44A
- Page 1 Model 44A/AP BROADBAND RF WATT METER OPERATION MANUAL ®...
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Page 2: Table Of Contents
Calibration / Adjustment Procedure REFERENCE VSWR Nomograph Low Frequency Correction Chart Jumper Cable Cutting Chart 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. Page 1... -
Page 3: Specifications
Telewave, Inc. Model 44A/AP SPECIFICATIONS Table 1-1 lists specifi cations for the Telewave Model 44A/AP 1.01 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 specifi... -
Page 4: General Description
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. Page 3... - Page 5 Telewave, Inc. Model 44A/AP Figure 2-1: Model 44A/AP Broadband RF Wattmeter Controls and Indicators Page 4...
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Page 6: Physical Description
Telewave, Inc. Model 44A/AP PHYSICAL DESCRIPTION The controls and indicators of the Model 44A/AP Broadband RF 3.01 Wattmeter are illustrated in Figure 2-1, and the functions of these elements are described in Table 3-1. Table 3-1 : Model 44A/AP Description... - Page 7 Telewave, Inc. Model 44A/AP Dual Directional Coupler SOURCE LOAD Figure 3-1: Model 44A/AP RF Wattmeter Schematic Table 3-2 : Model 44A/AP Parts List DESCRIPTION MFG P/N CU1,2 COUPLER HEAD ASSEMBLY TELEWAVE 7988 METER: 20 UA TRIPLETT 7034 KNOB RAYTHEON MS-91528-1P2B...
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Page 8: Functional Description
Telewave, Inc. Model 44A/AP FUNCTIONAL DESCRIPTION The Model 44A/AP Wattmeter is made up of two major sections. 4.01 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. -
Page 9: Accessory List
Telewave, Inc. Model 44A/AP Optional Accessories The table below lists the most common accessories for the Model 4.06 44A/AP Wattmeter. Consult the current price list or our website for current pricing. Part Number Description TC44 Leather carry case with accessory pouch... -
Page 10: Operation
Telewave, Inc. Model 44A/AP OPERATION Unpacking After the Model 44A/AP Wattmeter arrives, examine the shipping 5.01 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. -
Page 11: Power Measurements
Step Procedure Set the RF Range Switch to the 500 Watt position. Connect the RF Source to the Model 44A/AP FWD input connector, located on the left side of the instrument nearest the mode switch. Connect the RF Load to the Model 44A/AP FWD output connector, located on the right side of the instrument nearest the range switch. -
Page 12: Vswr Calculations
Telewave, Inc. Model 44A/AP VSWR Calculation The following procedure will assist the user in determining the 5.05 Voltage Standing Wave Ratio. Step Procedure Perform the procedures outlined in 5.03 and 5.04. Record the true incident and refl ected power. Refer to the VSWR Chart on the rear of the instrument or Figure 7-1. -
Page 13: Directivity And Insertion Error
VSWR. Since the impedance on either side of 1/2 wavelength is identical, the jumper cable added to the input or output of the Model 44A/AP should be of an appropriate length to equal 1/2 wavelength at the frequency of operation, thus eliminating any error due to the additional length. -
Page 14: Maintenance
Telewave. The following information will be requested in order to assign an RMA: • The Model 44A/AP serial number. The ID plate is located on the top of the instrument. Include the date of purchase and Purchase Order number if known. -
Page 15: Parts Location
Telewave, Inc. Model 44A/AP Figure 6-1: Adjustment Potentiometers and Parts Location REVERSE RANGES FORWARD RANGES 5 watt range 5 watt range 15 watt range 15 watt range 50 watt range 50 watt range 150 watt range 150 watt range 500 watt range... -
Page 16: Calibration / Adjustment Procedure
Note: A correction factor is required for measurements at frequencies below 150 MHz. The specifi ed power level is fed to the Telewave watt- meter, and the correct percentage factor from the frequency chart on Page 19 in the manual is added to the displayed power measurement. - Page 17 Set the wattmeter RF Range Switch to the 5 watt range. Set the RF source to 4 watts output. Adjust R1 until the Telewave wattmeter reads 4 watts. Set the wattmeter RF Range Switch to the 15 watt scale. Set the RF source to produce 11 watts output.
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Page 18: Reference
Telewave, Inc. Model 44A/AP REFERENCE Part 7 contains additional data for the Model 44A/AP RF Watt- 7.01 meter which is helpful in making low frequency and VSWR mea- surements. Figure 7-1 (below) shows a nomograph for estimating VSWR 7.02 from the measured incident and refl ected power. See 5.05 for cal- culation procedures. -
Page 19: Low Frequency Correction Chart
Telewave, Inc. Model 44A/AP CORRECTION FACTOR (%) Figure 7-2: Model 44A/AP RF Wattmeter Correction Factor for Frequencies below 150 MHz Page 18... -
Page 20: Jumper Cable Cutting Chart
Figure 7-3 shows a chart for a jumper cable to be used inline with 7.04 the Model 44A/AP Wattmeter to minimize potential measurement errors in systems with high VSWR. The chart shows lengths for a 50-ohm, RG-213 jumper cable, including N connectors, using a velocity factor of 0.66 for the cable and connectors. -
Page 21: Telewave, Inc. • 660 Giguere Court • San Jose, Ca 95133
PRODUCT WARRANTY Products sold by Telewave, Inc. and covered by this Warranty are warranted to be free from defects in material and work man ship at the time of and for a period of one (1) year after delivery to the Buyer. Seller’s entire warranty obligation is limited...
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