778D Dual Directional Coupler Operating and Service Manual
Contents
1. Frequency Maximum Magnitude Error A Range GHz Swept Frequency Fixed Frequency 0 1 to 1 0 015 0 04 0 05 T 2 0 015 0 05 I 1102 0 025 0 04 I 0 05 I 0 025 0 05 I reflection coefficient of unknown Errors include directivity tracking and source match errors but do not include any detection errors They are also based on the following conditions auxiliary arms are terminated in matched loads VSWR lt 1 2 the mean of open and short circuit readings is set to 1 0 and the short circuit phase reading is measured over a band of frequencies and the mean is set to 180 6 Agilent 778D Operating and Service Manual Impedance Measurement VHF OSCILLATOR Power Leveling Maintenance B DOUBLER Figure 5 Operation The 778D is also well suited for measurements of impedance when used with the Agilent 8508A vector voltmeter see Figure 5 Again a reflectometry technique is used With the vector voltmeter however both magnitude and phase of the reflection coefficient can be measured VECTOR VOLTMETER LINE STRETCHER UNKNOWN Setup for Impedance Measurement Data can be read from the two meters of the vector voltmeter and transferred directly to a Smith Chart to provide impedance information of such devices as antennas or other passive components In addition with an appropriate bias supply active components such as transistors can also be quickly measure2. Warranty service for products installed by Agilent Technologies and certain other products designated by Agilent Technologies will be performed at Buyer s facility at no charge within Agilent Technologies service travel areas Outside Agilent Technologies service travel areas warranty service will be performed at Buyer s facility only upon Agilent Technologies prior agreement and Buyer shall pay Agilent Technologies round trip travel expenses In all other areas products must be returned to a service facility designated by Agilent Technologies For products returned to Agilent Technologies for warranty service Buyer shall prepay shipping charges to Agilent Technologies and Agilent Technologies shall pay shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Agilent Technologies from another country Agilent Technologies warrants that its software and firmware designated by Agilent Technologies for use with an instrument will execute its programming instructions when properly installed on that instrument Agilent Technologies does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse op
3. a termination with a total SWR of 1 005 or less SWR Measurement SWR in this procedure will be measured in terms of reflection coefficient Because the directional couplers used in this procedure have finite directivity the measurement error due to directivity is taken into consideration in determining the test limits 1 Connect the equipment as shown in Figure 9 SWEEP NETWORK OSCILLATOR ANALYZER HARMONIC GENERATOR CRYSTAL DETECTOR CRYSTAL DETECTOR STEP i posse A TERMINATION E I LOW REFLECTION TERMINATION 1 en eee 207 2 NER LOW REFLECTION T TERMINATION Figure 9 SWR Measurement Setup 2 Set controls as shown in Table 4 on page 12 3 Set sweep oscillator to sweep an octave band in the range 0 1 to 2 GHz with no modulation 4 To establish a reference remove the termination This open will give a condition of 100 reflection If a good short is available use it also and 14 Agilent 778D Operating and Service Manual 10 11 12 13 14 Performance Testing take the amplitude reference as the average between the shorted and open conditions Be sure network analyzer is phase locked over entire range The display on the polar display should be an unbroken circle If not adjust network analyzer SWEEP STABILITY and or AMPLITUDE controls to phase lock over the entire sweep Push and hold the polar display s BEAM CTR push button and adjust HORIZ POS and V
4. and the stability of coupling with time make the 778D useful also as a wideband attenuator or for power monitoring applications To achieve its broad frequency coverage the 778D s directivity is optimized for mainline energy flowing in one direction This means that there is a preferred orientation for the 778D To achieve the measurement accuracies in the specifications the test device or system should be connected where the 778D is labeled TEST PORT To accommodate test devices with Type N or APC 7 connectors a choice of connectors is available on the TEST PORT see Options outlined in Specifications on page 2 With the APC 7 precision sexless connector on the output the coupler can be conveniently converted to other types of connectors by the use of an adapter Adapters are available to the SMA OSM TNC GR900 and others so that the coupler becomes a versatile device for making measurements on many different types of connectors The Amphenol APC 7 is a sexless connector with very low SWR This precision connector makes possible the construction of adapters with low SWR Agilent 778D Operating and Service Manual 1 Specifications Specifications Specifications for the 778D are shown in the following table Characteristic Value Frequency range 100 to 2000 MHz usable below 100 MHz Directivity See figure on page 1 Auxiliary arm 0 1 to 1 0 GHz Auxiliary arm 1 0 to 2 0 GHz A 36 dB B 30 dB A 32
5. range with AMPL VERNIER control or AMPLITUDE TEST CHANNEL GAIN dB Draw a horizontal line with a grease pencil on the CRT somewhere above the middle X axis line Place the average of the reference trace on the grease pencil line by adjusting the oscilloscope VERTICAL POSITION control Put the low reflection termination back on the coupler as shown in Figure 8 Increase the network analyzer TEST CHANNEL GAIN DB by the amount of the directivity specification for this frequency range The entire trace should stay below the grease pencil line If a portion of the trace goes above the line the coupler may or may not be out of specification the reflection from the load may be adding to the directivity of the coupler Test these ambiguous frequencies with the fixed frequency testing following Repeat this test at the other frequency range given in the Specifications on page 2 Then turn the coupler around to test the directivity at port B and repeat the above tests Agilent 778D Operating and Service Manual 13 Performance Testing Termination In the preceding of the following tests use the best termination obtainable The accuracy of the tests will depend to a great extent upon the quality of the termination Note that the quality of the termination includes any adapter necessary for connection The adapter reflection coefficient will add vectorially to the termination reflection coefficient These instructions assume the use of
6. 9 7599 Australia 5947 Asia Call Center Numbers New Zealand tel O 800 738 378 fax 64 4 495 8950 Europe tel 31 20 547 2323 fax 31 20 547 2390 tel 1 800 629 485 fax 61 3 9210 Country Phone Number Fax Number Singapore 1 800 375 8100 65 836 0252 Malaysia 1 800 828 848 1 800 801664 Philippines 632 8426802 632 8426809 1 800 16510170 PLDT 1 800 16510288 PLDT Subscriber Only Subscriber Only Thailand 088 226 008 outside Bangkok 66 1 661 3714 662 661 3999 within Bangkok Hong Kong 800 930 871 852 2506 9233 Taiwan 0800 047 866 886 2 25456723 People s Republic of China 800 810 0189 preferred 10800 650 0021 10800 650 0121 India 1 600 11 2929 000 800 650 1101 vi Agilent 778D Operating And Service Manual WARNING CAUTION Instrument Markings Safety and Regulatory Information Review this product and related documentation to familiarize yourself with safety markings and instructions before you operate the instrument This product has been designed and tested in accordance with international standards The WARNING notice denotes a hazard It calls attention to a procedure practice or the like that if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met The CAUTION notice denotes a hazard It calls at
7. Advanced Test Equipment Rentals A ished 1981 www atecorp com 800 404 ATEC 2832 E Agilent Technologies 778D Dual Directional Coupler Operating and Service Manual Manual part number 00778 90013 Printed in USA March 2001 Supersedes June 2000 Revision 2 0 Notice The information contained in this document is subject to change without notice Agilent Technologies makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material Agilent Technologies assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Agilent Technologies This document contains proprietary information which is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated to another language without prior written consent of Agilent Technologies RESTRICTED RIGHTS LEGEND Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and subparagraphs c 1 and c 2 of the Commercial Computer
8. ERT POS controls to place the dot in the center of the graticule To bring the dot onto the display rotate each positioning control about five turns counterclockwise or until a slight increase in resistance to movement is encountered Then turn each control two and one half turns clockwise Center the trace on the outer graticule circle using the network analyzer position and amplitude controls If a good short is available average the position between the open and shorted indications Note TEST CHANNEL GAIN reading Increase TEST CHANNEL GAIN by 26 dB The outer graticule is now calibrated to a reflection coefficient of 0 05 and the inner graticule to 0 01 Connect the mainline of the 778D under test in place of the termination shown in Figure 9 Terminate the mainline of the 778D under test with the best termination available A poorer termination may be used to terminate the auxiliary arms The indication should be less than the following limits 0 1 to 1 0 GHz 0 032 1 0 to 2 0 GHz 0 022 If these limits are exceeded at any frequency set the sweep oscillator for CW operation at this frequency Remove the 778D under test from the reflectometer and connect a low reflection termination to the reflectometer With the VERT and HORIZ Position controls set the dot to the center of the graticule This effectively cancels out the directivity signal at this frequency Remove the low reflection termination and reconnect the 778D under t
9. LOSCOPE ANALYZER OSCILLATOR TkHz LOW PASS FILTER HARMONIC CONVERTER LOW REFLECTION TERMINATION Swept Frequency Directivity Setup 2 Set the controls as shown in Table 4 on page 12 Control Settings Characteristic Setting Network Analyzer Frequency range 1 to 2 GHz set Sweep Stability Vernier to phase lock display Amplitude test Channel Gain 20 dB Sweep Oscillator see network analyzer manual for proper output level Function Start Stop Start CW 1 0GHz Stop A F 2 0 GHz Sweep Selector Auto Sweep Time 1 0 0 1 set vernier to phase lock display 12 Agilent 778D Operating and Service Manual Performance Testing Table 4 Control Settings Continued Characteristic Setting Vertical Sens 50 mV calibration to make 1 dB gain change on network analyzer equal 1 cm vertical change on CRT Horizon Sens 1V cm Sweep Mode Ext Input DC 3 establish a reference remove the low reflection termination This 10 11 open will give a condition of 100 reflection If a good short is available use also and take the amplitude reference as the average between the shorted and open conditions Be sure network analyzer is phase locked over entire range The display on the oscilloscope should be an unbroken line If not adjust network analyzer SWEEP STABILITY and or AMPLITUDE controls to phase lock over the entire sweep Zero network analyzer phase gain meter on 10 dB AMPLITUDE
10. Software Restricted Rights clause at FAR 52 227 19 for other agencies Agilent Technologies Inc 1400 Fountaingrove Parkway Santa Rosa CA 95403 1799 U S A Copyright 2000 2001 Agilent Technologies Inc ii Agilent 778D Operating And Service Manual What You ll Find In This Manual Overview page 1 Specifications page 2 Installation and Shipping page 3 Operation page 5 Performance Testing page 9 Agilent 778D Operating And Service Manual iii Certification Warranty Warranty Custom systems are warranted by contractual agreement between Agilent Technologies and the customer Agilent Technologies Inc certifies that this product met its published specifications at the time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology NIST formerly NBS to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members This Agilent Technologies system product is warranted against defects in materials and workmanship for a period corresponding to the individual warranty periods of its component products Instruments are warranted for a period of one year During the warranty period Agilent Technologies will at its option either repair or replace products that prove to be defective
11. cations Adapter 2 Type N male to male 1 kHz Filter Adapter Rejects 1 kHz and above LT INT TE AT YT TT H BRS Shek wees 50 75 1 0 1 25 150 175 20 FREQUENCY GHz Figure 7 Typical Coupling Variation with Frequency 10 Agilent 778D Operating and Service Manual Swept Frequency Directivity NOTE Performance Testing Table 3 Performance Test Record Tested by Date Dual Directional Coupler Instrument Serial Number Directivity Auxiliary Arm 0 1 to 1 0 GHz 1 0 to 2 0 GHz A dB lt 36dB dB lt 32dB B dB x 30dB dB lt 30dB SWR Measurement Primary Line Sl ___________ lt 1 1 Auxiliary Arm lt 1 1 x1 1 Directivity in dB is equal to P 10 log when Pmain flows reversed when Pmain flows forward aux where P Power aux auxiliary arm main main arm The power input to the main arm is the same for both measurements To measure the directivity proceed as follows 1 Connect the equipment as shown in Figure 8 on page 12 the purpose of the 1 kHz low pass filter input to the oscilloscope is to reduce noise Agilent 778D Operating and Service Manual 11 Figure 8 Table 4 Performance Testing The setup as shown will measure the directivity of port A To measure the directivity of port B reverse the coupler NETWORK SWEEP OSCIL
12. d and their characteristics determined with this setup The 778D is well suited for these types of measurements since both the phase and magnitude variation between the coupling arms have been closely controlled in the design of the coupler The 778D has cyclic coupling variations of up to 2 dB For this reason it is not recommended for power leveling that requires flatness exceeding these tolerances A typical coupling curve is shown in Figure 7 on page 10 The directional coupler should need very little maintenance besides keeping it clean and protecting the connector faces Agilent 778D Operating and Service Manual 7 Operation NETWORK SWEEP OSCILLOSCOPE ANALYZER OSCILLATOR lkHz LOW PASS FILTER HARMONIC CONVERTER LOW REFLECTION TERMINATION Figure 6 Typical Coupling Variation with Frequency 8 Agilent 778D Operating and Service Manual Table 2 Performance Testing Performance Testing Use the following procedure for initial inspection performance testing or whenever the coupler performance is suspected Table 2 lists equipment necessary for testing Other equipment may be substituted provided its specifications equal or exceed the specifications listed under Critical Specifications The coupler should be tested on a swept frequency basis to assure that there are no out of specification narrow frequency bands between the spot frequencies tested on a fixed frequency basis If
13. dB B 30 dB Coupling Attenuation nominal coupling above 450 MHz is 20 dB nominal coupling above 450 MHz is 20 dB increasing with a slope of 0 006 dB MHz for decreasing frequency Coupling variation 1 5 dB from nominal Cyclical variation Frequency is similar to Figure 7 on page 10 Tracking Auxiliary outputs typically track within 0 7 dB Phase tracking typically 49 SWR Primary Line 1 1 Auxiliary Arms 1 1 Maximum main line power 50 W average 500 W peak Accessories available adapters 2 11533A APC 7 to SMA male 11534A APC 7 to SMA female 11525A APC 7 to Type N male 11524A APC 7 to Type N female Connectors Choice of main line connectors see options Auxiliary Arms have Type N female All Type N connectors stainless steel compatible with MIL C 39012 and MIL C 71 Dimension 16 3 4 in long x 4 3 8 in high x 1 3 16 in wide 425 mm x 111 mm x 30 mm Net weight 3 3 4 Ib 1 5 kg Options available 778D Type N female output Type N male input connectors Option 011 APC 7 output Type N female input connectors Option 012 Type N male output Type N female input connectors 1 See Figure 6 on page 8 for a typical coupling curve 2 Adapters from APC 7 to TNC GR 900 GR 874 as well as the above are available from Amphenol RF Division Danbury CN 2 Agilent 778D Operating and Service Manual Unpacking and Inspection CAUTION Figure 1 Repackaging for Shipme
14. eration outside of the environmental specifications for the product or improper site preparation or maintenance iv Agilent 778D Operating And Service Manual Assistance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY YEAR 2000 Agilent Technologies warrants that each Agilent Technologies hardware software and firmware product on Agilent Technologies Corporate Price List dated July 1 1998 or later delivered under the product s contract of sale will be able to accurately process date data including but not limited to calculating comparing and sequencing from into and between the twentieth and twenty first centuries and the years 1999 and 2000 including leap year calculations when used in accordance with the product documentation provided that all other products that is hardware software firmware used in combination with such Agilent Technologies product s properly exchange date data with it If the agreement requires that specific Agilent Technologies products must perform as a system in accordance with the foregoing warranty then tha
15. est The indication should be less than 0 045 0 1 to 2 0 GHz Agilent 778D Operating and Service Manual 15
16. ied power cord set Whenever it is likely that the protection has been impaired the product must be made inoperative and secured against any unintended operation Before Applying Power Verify that the product is configured to match the available main power source as described in the input power configuration instructions in this manual If this product is to be powered by autotransformer make sure the common terminal is connected to the neutral grounded side of the ac power supply viii Agilent 778D Operating And Service Manual Description Overview This coaxial dual directional coupler has a frequency range extending over four octaves from 100 MHz to 2 GHz Although the coupling factor increases 6 dB octave below 100 MHz directivity remains above 36 dB Thus the coupler can be used below 100 MHz as well as above The usefulness below 100 MHz is restricted only by the amount of signal source power and or the sensitivity of the RF detector connected to the coupler The unidirectional characteristic of the Agilent 778D dual directional coupler makes it an important tool in microwave measurement systems The 778D has the property of inducing in an auxiliary line a contra directional flow of power which is proportional to the power flowing in the main guide This coupler may be used in the measurement of reflection coefficients or SWR over a very wide frequency range The relatively constant coupling across several frequency bands
17. nector is recommended Using an adapter will degrade the effective directivity of the measurement REF LOAD m LOAD AUX TEST Signal Flow Operate the coupler at normal room temperature and do not temperature cycle the coupler in use or storage Heat cycling may degrade the performance of the coupler Figure 4 on page 6 shows an arrangement in which swept frequency measurements of reflection coefficient are easily made with the coupler Incident and reflected signals are detected from the auxiliary arms of the coupler The signals can then be displayed on an oscilloscope or X Y recorder to give a visual display of reflection coefficient or SWR Agilent 778D Operating and Service Manual 5 Errors Operation OSCILLOSCOPE SWEPT SWEEP FREQUENCY OSCILLATOR i INDICATOR UNKNOWN Figure4 Typical Reflectometry Setup The high directivity and close tracking of the auxiliary arms of this coupler make it particularly useful for this type of broadband measurement The high directivity insures accurate measurements by a true separation of the forward and reflected signals Close tracking of signal variation from the auxiliary arms gives a flat frequency response that makes readings easy to interpret Maximum errors in reflection measurement due to the coupler are as follows where reflection coefficient of device under test Maximum phase error sin AL T 1 90 Table 1 Errors
18. nt Using Original Packaging Installation and Shipping Installation and Shipping The coupler was carefully inspected mechanically and electrically prior to shipment Inspect it for mechanical damage incurred in transit and test electrical performance using the test procedure given under Performance Testing If there is damage or deficiency notify the carrier and the nearest Agilent Technologies office In the event of mechanical damage the packing materials and carton should be held for the carrier s inspection Protect the face of the connectors especially the APC 7 from damage Any scoring or burring of the mating surfaces causes discontinuity the resulting increase in SWR degrades performance see Figure 1 COUPLING SLEEVE CONTACTING SURFACES Care of APC 7 Connectors The same containers and materials used in factory packaging can be obtained through Agilent Technologies If the coupler is being returned to Agilent Technologies for servicing attach a tag indicating the type of service required return address and model number Also mark the container FRAGILE to assure careful handling In any correspondence refer to the coupler by full model number Agilent 778D Operating and Service Manual 3 Installation and Shipping Using Other Packaging The following general instructions should be used for repackaging with commercially available materials 1 Wrap the coupler in heavy paper or plastic If ship
19. ping to a Agilent Technologies office or service center attach a tag indicating the type of service required return address and model number 2 Use a strong shipping container A double wall carton made of 2 4 MPa 350 psi test material is adequate 3 Use enough shock absorbing material 3 4 inch layer around all sides of the coupler to provide firm cushion and prevent movement inside the container 4 Sealthe shipping container securely 5 Mark the shipping container FRAGILE to assure careful handling Load Bearing When installing be sure auxiliary equipment supports its own weight The coupler particularly the connectors is not designed to carry weight Load limits for APC 7 connectors are given in Figure 2 FULCRUM POINT at S E CONTACT PLANE Y TORQUE BENDING 3 389 N m MOMENT 2 1 2 ft lbs 2 033 N m 1 2 ft lbs Figure 2 Load Limits for APC 7 Connector 4 Agilent 778D Operating and Service Manual Signal Flow Figure 3 Coupler Temperature Reflectometer Measurements Operation Operation Unlike some other dual directional couplers this coupler is polarized For best performance the signal must flow through the coupler as shown in Figure 3 Observe the TEST PORT designation on the label DO NOT reverse the coupler since the directivity may be somewhat lower in the reverse direction To test devices with other types of connectors another coupler with the correct mating test port con
20. t warranty will apply to those Agilent Technologies products as a system and Customer retains sole responsibility to ensure the year 2000 readiness of its information technology and business environment The duration of this warranty extends through January 31 2001 The remedies available under this warranty will be defined in and subject to the terms and limitations of the warranties contained in the contract of sale To the extent permitted by local law this warranty applies only to branded Agilent Technologies products and not to products manufacture by others that may be sold or distributed by Agilent Technologies Nothing in this warranty will be construed to limit any rights or remedies provided elsewhere in the contract of sale with respect to matters other than year 2000 compliance Product maintenance agreements and other customer assistance agreements are available for Agilent Technologies products For assistance call your local Agilent Technologies Sales and Service Office refer to Service and Support on page vi Agilent 778D Operating And Service Manual v Service and Support By internet phone or fax get assistance with all your test and measurement needs Online assistance United States tel 1 800 452 4844 Canada tel 1 877 894 4414 fax 905 282 6495 www agilent com find assist J apan tel 81 426 56 7832 fax 81 426 56 7840 Latin America tel 305 269 7500 fax 305 26
21. tention to an operating procedure practice or the like which if not correctly performed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met When you see this symbol on your instrument you should refer to the instrument s instruction manual for important information 4 This symbol indicates hazardous voltages MNI The laser radiation symbol is marked on products that have a laser output This symbol indicates that the instrument requires alternating current ac input The CE mark is a registered trademark of the European Community If it is ccompanied by a year it indicates the year the design was proven The CSA mark is registered trademark of the Canadian Standards Association Cn e 1SM1 A This text indicates that the instrument is an Industrial S cientific and Medical Group 1 Class A product CISPER 11 Clause 4 This symbol indicates that power line switch is ON This symbol indicates that power line switch is OFF or in STANDBY position Agilent 778D Operating And Service Manual vii Safety Earth LL This is a Safety Class I product provided with a protective earthing Ground terminal An uninterruptible safety earth ground must be provided from the main power source to the product input wiring terminals power cord or suppl
22. the results of swept frequency testing are doubtful or if the equipment for swept frequency testing is not available the fixed frequency test may be used Table 3 on page 11 provides a place to record the results Recommended Test Equipment Instrument Critical Specifications Sweep oscillator Frequency 0 1 to 2 0 GHz Modulation 1kHz square wave Leveling V proportional to RF Low pass filter Rejects second harmonics lowest frequency Rejection 250 dB at 1 25 fco Network analyzer No other network analyzer is recommended SWR meter Frequency compatible with sweep oscillator Accuracy 30 1 dB X Y recorder Impedance 200 K ohms V Sensitivity 250 mV in Crystal detector 2 Frequency 0 1 to 2 0 GHz Sensitivity 24 0 mV uW Coaxial attenuator Frequency 0 1 to 2 0 GHz Attenuation 20 dB or 10 dB Low reflection termination SWR x1 005 0 1 MHz to 2 0 GHz Type N connectors Oscilloscope Vertical Sensitivity gt 10 mV cm Horizontal S weep synchronized ext Termination 2 Frequency band of interest Load SWR lt 1 01 de to 2 GHz Dual directional coupler Frequency band of interest Directivity gt 40 dB Impedance 50 ohms coaxial Short 7 mm coaxial Type N Agilent 778D Operating and Service Manual 9 COUPLING dB BA 21 20 Performance Testing Table 2 Recommended Test Equipment Continued Instrument Critical Specifi
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