Related Manuals for TELEWAVE 44A
Summary of Contents for TELEWAVE 44A
- Page 1 Model 44A/AP BROADBAND RF WATT METER Operation Manual 48421 Milmont Dr Phone 408-929-4400 Fremont, CA 94538 sales@telewave.com www.telewave.com support@telewave.com Copyright © 2024 Telewave.io.
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Page 2: Table Of Contents
Telewave.io 44A/AP Operation Manual MODEL 44A/AP BROADBAND RF WATTMETER DESCRIPTION AND OPERATION Table of Contents Specifications ..........................3 General Description ........................4 Physical Description ........................6 Functional Description ........................8 Operation ..........................10 IMPORTANT ..........................10 Maintenance ..........................14 Reference ..........................18 Copyright ©... -
Page 3: Specifications
Minor deviations from these specifications which do not affect the performance of the Model 44A/AP Wattmeter should not be considered a warranty issue. -
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 applications as well as base stations. - Page 5 Telewave.io 44A/AP Operation Manual Figure 2-1: Model 44A/AP Broadband RF Wattmeter Controls and Indicators Copyright © Telewave.io. Page 5 of 21 Specifications subject to change without notice www.telewave.com 1-408-929-4400 240823 sales@telewave.com support@telewave.com...
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Page 6: Physical Description
Telewave.io 44A/AP Operation Manual Physical Description 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. Table 3-1 : Model 44A/AP Description Key Item... - Page 7 Telewave.io 44A/AP Operation Manual 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 SCREW: BUMPER 6-32 TELEWAVE TB44...
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Page 8: Functional Description
Telewave.io 44A/AP Operation Manual Functional Description 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 Dual RF Directional Coupler with directivity of greater than 25 dB. - Page 9 Telewave.io 44A/AP Operation Manual Optional Accessories 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. Part Number Description TC44 Leather carry case with accessory pouch...
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Page 10: Operation
Telewave.io 44A/AP Operation Manual Operation Unpacking 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. - Page 11 Telewave.io 44A/AP Operation Manual Forward Power Measurement The following procedure will assist the user in making an incident or forward power measurement. Refer to Figure 2-1. Step Procedure Set the Mode Switch to the FWD position. Apply RF power to the transmission line.
- Page 12 Telewave.io 44A/AP Operation Manual VSWR Calculation The following procedure will assist the user in determining the Voltage Standing Wave Ratio. Step Procedure Perform the procedures outlined in 5.03 and 5.04. Record the true incident and reflected power. Refer to the VSWR Chart on the rear of the instrument or Figure 7-1.
- Page 13 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.
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Page 14: Maintenance
A Return Material Authorization (RMA) is required when products are returned to Telewave.io. 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 Telewave.io 44A/AP Operation Manual 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 Note: A correction factor is required for measurements at frequencies below 150 MHz. The specified power level is fed to the Telewave.io wattmeter, 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.io 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.io 44A/AP Operation Manual Reference Part 7 contains additional data for the Model 44A/AP RF Watt- meter which helps make low- frequency and VSWR measurements. Figure 7-1 (below) shows a nomograph for estimating VSWR from the measured incident and reflected power. See 5.05 for calculation procedures. - Page 19 Telewave.io 44A/AP Operation Manual Figure 7-2: Model 44A/AP RF Wattmeter Correction Factor for Frequencies below 150 MHz Copyright © Telewave.io. Page 19 of 21 Specifications subject to change without notice www.telewave.com 1-408-929-4400 240823 sales@telewave.com support@telewave.com...
- Page 20 Telewave.io 44A/AP Operation Manual Figure 7-3 shows a chart for a jumper cable to be used in line with 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.io 44A/AP Operation Manual PRODUCT WARRANTY Products sold by Telewave.io and covered by this Warranty are warranted to be free from defects in material and workmanship at the time of and for one (1) year after delivery to the Buyer. Seller’s entire warranty obligation is limited to making adjustments by repair, replacement, or refunding the purchase price of any product that is returned to the Seller as provided below within one (1) year from the date of shipment by the Seller.
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