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TELEWAVE 44L1, Operation Manual

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TELEWAVE 44L1 Operation Manual Download Page 19

Page 18

Telewave, Inc.
Model 44L1/L1P

7.03

 

Figure 7-2 shows a chart for a jumper cable to be used inline with 

the Model 44L1/L1P Wattmeter to minimize potential measure

-

ment 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. The 

jumper cable 

and

 wattmeter together should equal as close to 1/2 

wavelength equivalent as possible, at the test frequency.

Figure 7-2: RG-213 Jumper Cable with N-Male Connectors

MHZ 

INCHES

  25  =  153.23
  30  =  127.25
  35  =  108.69
  40  =    94.78
  45  =    83.95
  50  =    75.29
  55  =    68.21
  60  =    62.30
  65  =    57.31
  70  =    53.03
  75  =    49.32
  80  =    46.07
  85  =    43.20
  90  =    40.66
  95  =    38.38
100  =    36.33
105  =    34.47
110  =    32.78

MHZ 

INCHES

115  =  31.24
120  =  29.83
125  =  28.53
130  =  27.33
135  =  26.22
140  =  25.19
145  =  24.23
150  =  23.34
155  =  22.50
160  =  21.71
165  =  20.98
170  =  20.28
175  =  19.63
180  =  19.01
185  =  18.42
190  =  17.87
195  =  17.34
200  =  16.84

Summary of Contents for 44L1

Page 1: ...Model 44L1 L1P BROADBAND RF WATT METER OPERATION MANUAL ...

Page 2: ...y 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 Jumper Cable Cutting Chart 18 Telewave Inc 660 Giguere Court San Jose CA 95133 1 800 331 3396 408 929 440...

Page 3: ...l 44L1 L1P Wattmeter should not be considered a warranty issue Table 1 1 Model 44L1 L1P RF Wattmeter Specifications Parameter Characteristics Frequency Range Accuracy 2 to 200 MHz 7 percent of full scale Specified with N connectors only 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 44L1P 40 dB 2 dB RF Con...

Page 4: ...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 ...

Page 5: ...Page 4 Telewave Inc Model 44L1 L1P 1 8 7 6 5 4 3 2 9 Figure 2 1 Model 44L1 L1P Broadband RF Wattmeter Controls and Indicators ...

Page 6: ...asure ment or signal injection Model 44L1P 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 Displa...

Page 7: ... RESISTOR VAR CC 0 25W 10 50K OHM RESISTOR VAR CC 0 25W 10 50K OHM RESISTOR FXD CC 0 50W 5 7 5K OHM RESISTOR FXD CC 0 50W 5 7 5K OHM RESISTOR VAR CC 0 25W 10 50K OHM RESISTOR VAR CC 0 25W 10 50K OHM RESISTOR FXD CC 0 50W 5 62K OHM RESISTOR FXD CC 0 50W 5 62K OHM RESISTOR VAR CC 0 25W 10 50K OHM RESISTOR VAR CC 0 25W 10 100K OHM RESISTOR FXD CC 0 50W 5 130K OHM RESISTOR FXD CC 0 50W 5 130K OHM RESI...

Page 8: ... 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 improved accuracy An OFF position is provided on ...

Page 9: ...ry 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 Optional Accessories 4 06 The table below lists the most common accessories for the Model 44L1 L...

Page 10: ... 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...

Page 11: ...ment 5 03 The following procedure will assist the user in making an incident or forward power measurement Refer to Figure 2 1 Step Procedure 1 Set the Mode Switch to the FWD position 2 Apply RF power to the transmission line 3 Move the RF Range Switch to a lower range if necessary to obtain a reading in the upper third of the scale 4 Note the meter reading Reflected Power Measurement 5 04 The foll...

Page 12: ...he readings from Step 1 to the chart 3 The VSWR is read from the nearest sloping line For higher accuracy calculate the VSWR by the formula True Power at Load Calculations 5 06 The following procedure will assist the user in determining the actual power delivered to the load Step Procedure 1 Perform the procedures outlined in 5 03 and 5 04 Record the true incident and reflected power 2 Subtract th...

Page 13: ...ributed by inserting the Model 44L1 L1P Wattmeter alone is negli gible However the use of a jumper cable to connect the wattmeter in the system will change the characteristic impedance of the line especially in a system with high 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 44L1 L1P should be of an appro priate le...

Page 14: ...ere Court San Jose CA 95133 1 800 331 3396 1 408 929 4400 6 03 A Return Material Authorization RMA is required when prod ucts are returned to Telewave The following information will be requested in order to assign an RMA The Model 44L1 L1P serial number The ID plate is located on the top of the instrument Include the date of purchase and Purchase Order number if known A brief statement of the prob...

Page 15: ...ocation FORWARD RANGES R1 5 watt range R3 15 watt range R7 50 watt range R11 150 watt range R15 500 watt range REVERSE RANGES R2 5 watt range R6 15 watt range R10 50 watt range R14 150 watt range R18 500 watt range R18 R2 R1 R15 R6 R3 R14 R11 R10 R7 R20 R19 R13 R17 R5 R9 R8 R4 R12 R16 ...

Page 16: ...ss filter capable of handling at least the maximum continuous power used during calibration must be installed between the RF source and the Telewave meter f A calibrated digital power meter and remote sensor with accuracy of 0 5 or better traceable to NIST Insertion loss of all test equipment must be characterized g A 50 ohm inline attenuator capable of handling the maximum continuous power that w...

Page 17: ...eter reads 35 watts 4a Set the wattmeter RF Range Switch to the 150 watt scale 4b Set the RF source to produce 105 watts output 4c Adjust R11 until the Telewave wattmeter reads 105 watts 5a Set the wattmeter RF Range Switch to the 500 watt scale 5b Set the RF source to produce 325 watts output 5c Adjust R15 until the Telewave wattmeter reads 325 watts Step Procedure 1a Set the RF source to 100 MHz...

Page 18: ... 1 2 5 1 2 0 1 1 5 1 1 2 1 1 0 100 50 20 10 5 2 1 0 5 0 2 0 1 500 200 100 50 20 10 5 2 1 VSWR CHART 8 7 REFERENCE 7 01 Part 7 contains additional data for the Model 44L1 L1P RF Watt meter which is helpful in making low frequency and VSWR mea surements 7 02 Figure 7 1 below shows a nomograph for estimating VSWR from the measured incident and reflected power See 5 05 for cal culation procedures ...

Page 19: ...The jumper cable and wattmeter together should equal as close to 1 2 wavelength equivalent as possible at the test frequency Figure 7 2 RG 213 Jumper Cable with N Male Connectors MHZ INCHES 25 153 23 30 127 25 35 108 69 40 94 78 45 83 95 50 75 29 55 68 21 60 62 30 65 57 31 70 53 03 75 49 32 80 46 07 85 43 20 90 40 66 95 38 38 100 36 33 105 34 47 110 32 78 MHZ INCHES 115 31 24 120 29 83 125 28 53 1...

Page 20: ...allowed a charge of 5 of the original purchase price will be made to the Buyer to cover the Seller s cost of in spection and handling Shipping and packaging instructions must be obtained from the Seller before prod ucts are returned for adjustment The Buyer will pay for packing transportation and transit insurance costs for returned products The Seller reserves the right to discontinue models at a...

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