GW Instek GRF-1300 User Manual
  1. Manuals
  2. Brands
  3. GW Instek Manuals
  4. Fitness Equipment
  5. GRF-1300
  6. User manual
GW Instek GRF-1300 User Manual

GW Instek GRF-1300 User Manual

Rf & communication trainer
Hide thumbs Also See for GRF-1300:
Table of Contents

Advertisement

Quick Links

Download this manual
RF & Communication Trainer
GRF-1300
STUDENT BOOK
USER MANUAL and TEXT BOOK
GW INSTEK PART NO. 82RF-13000M01
ISO-9001 CERTIFIED MANUFACTURER
GlobalTestSupply
www.
.com
Find Quality Products Online at:
sales@GlobalTestSupply.com

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the GRF-1300 and is the answer not in the manual?

Questions and answers

Related Manuals for GW Instek GRF-1300

Summary of Contents for GW Instek GRF-1300

  • Page 1 RF & Communication Trainer GRF-1300 STUDENT BOOK USER MANUAL and TEXT BOOK GW INSTEK PART NO. 82RF-13000M01 ISO-9001 CERTIFIED MANUFACTURER GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 2 This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will Corporation. The information in this manual was correct at the time of printing. However, Good Will continues to improve its products and therefore reserves the right to change the specifications, equipment, and maintenance procedures at any time without notice.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Table of Contents SAFETY INSTRUCTIONS ..............2   ABOUT THIS BOOK ............... 5   INTRODUCTION to the GRF-1300 ..........5   Package Contents ....................7   Product Specifications and Function ................ 7   Usage Instructions ....................8  ...

  • Page 4: Safety Instructions

    AFETY INSTRUCTIONS This chapter contains important safety instructions that should be followed when operating and storing the GRF-1300. Read the following before any operation to ensure your safety and to keep the GRF-1300 in the best condition. Safety Symbols These safety symbols may appear in this manual or on the instrument.
  • Page 5  Disconnect the power cord before cleaning the device. Cleaning the  GRF-1300 Use a soft cloth dampened in a solution of mild detergent and water. Do  not spray any liquid into the device. Do not use chemicals containing harsh products such as benzene, toluene, ...
  • Page 6 GRF-1300 User Manual and Teaching Materials Power cord for the United Kingdom When using the device in the United Kingdom, make sure the power cord meets the following safety instructions. NOTE: This lead/appliance must only be wired by competent persons...

  • Page 7: About This Book

    The GRF-1300 is a well designed training kit capable of producing a 3MHz baseband signal and a carrier signal up to 900MHz. The GRF-1300 is also able to perform AM and FM RF circuit experiments as well. The practical exercises in the training kit meet the needs of most general RF courses.
  • Page 8 Connecting different modules together can create a number of different RF circuit experiments. Specific experiments will be highlighted in later chapters. The GRF-1300 RF & Communication Trainer is designed to modulate an audio signal with a carrier waveform. The system takes into account the difficulties arising from RF circuit theory and knowledge.

  • Page 9: Introduction To The Grf-1300

    INTRODUCTION to the GRF-1300 Package Contents This package contains the GRF-1300 unit, RF cable – 2 * 10cm, RF cable 1* 80cm, a user manual CD, a student book, an antenna, a power cord and so on. Title Photo Note...

  • Page 10: Usage Instructions

     WAVE Select is used to select three different baseband waveforms. When the waveform is selected, the corresponding LED light will be lit  The Reset button is used to reset the GRF-1300. When reset, the GRF- 1300 will output a 0.10MHz sine wave baseband signal and a carrier signal with a frequency 880MHz.
  • Page 11 INTRODUCTION to the GRF-1300  TP4 (test point 4) is used to used to monitor the output signal from the output port.  The potentiometer knob is used to adjust the voltage of the output baseband signal. Turn clockwise to increase the amplitude and turn anticlockwise to decrease its amplitude.
  • Page 12 Figure A-7. Circuit location of each test point 8. Install the GRF-1300 driver onto the PC.  Connect the GRF-1300 to the PC. Below are the steps for installing the software. Add the install software to the install directory. Click next and a window as shown below appears.
  • Page 13 INTRODUCTION to the GRF-1300 Figure A-9. Installation procedure is complete  After the software installation is complete, users can perform a system error check by sending commands to the GRF-1300 using Hyper Terminal. Figure A-10. Operation interface for HyperTerminal GlobalTestSupply www.
  • Page 14 GRF-1300 User Manual and Teaching Materials 9. Below is a table listing each instruction and a description of each function. Instruction Function *IDN? Returns the manufacturer, model name and serial number. Returns the value on the digital display of the FM/RF module.

  • Page 15: Overview Of The Time And Frequency Domain

    OVERVIEW of the TIME and FREQUENCY DOMAIN VERVIEW of the TIME and FREQUENCY DOMAIN Observation from a different perspective When a signal is said to be in the time domain, it means that the signal is expressed as a function of time. For example, if we describe a sine wave signal that repeats once each microsecond (μsec, 10 ), it means that the period of the signal is 1 microsecond.
  • Page 16 GRF-1300 User Manual and Teaching Materials What about a square wave? We will now explain how a square waveform and sine waveform are different to each other in the frequency domain. If we input a square wave with a period of 1 microsecond into a spectrum analyzer, its waveform performance (we usually to say its spectrum or frequency distribution) is as follows.
  • Page 17 GRF-1300 User Manual and Teaching Materials N INTRODUCTION to SPECTRUM ANALYZERS Spectrum analyzers are one of the most important instruments for RF microwave measurements. Being familiar with spectrum analyzers in general is very important for operating high frequency microwave equipment or for performing communication measurements.

  • Page 18: An Introduction To Spectrum Analyzers

    AN INTRODUCTION to SPECTRUM ANALYZERS Next, we are going to introduce the other basic functional blocks that a spectrum analyzer is composed of. These blocks are often mentioned when instructed on how to use a spectrum analyzer. Attenuator An attenuator on the RF input path can increase the dynamic range of the input signal level or provide more input protection to the spectrum analyzer.
  • Page 19 GRF-1300 User Manual and Teaching Materials Signal under test Results RBW1 RBW2 Figure B-4. The effect of different RBWs (1) After passing the narrower RBW1 filter, the components of the two tone signal are clearly distinguished from each other as a result. But in the wider RBW2 filter, the result is not as clear as RBW1.

  • Page 20: Detector

    AN INTRODUCTION to SPECTRUM ANALYZERS Detector Following the RBW filter, the detector detects the power and coverts it to DC voltage via an ADC so that it can be displayed. Figure B-6. Detector Video Bandwidth Filter However, a filter is employed after the detector to filter out the noise generated by the detector.
  • Page 21 In this chapter we will explain the basic operating principals of a spectrum analyzer and introduce the measurement experiments. Prior to this, we will briefly explain how to operate the GW Instek GSP-730 spectrum analyzer. For more detail about its operation, please refer to the GSP-730 user manual.

  • Page 22: Rf Communication And Signals Experiments

    RF COMMUNICATION and SIGNALS EXPERIMENTS Experiment 1: Basic Operation of a Spectrum Analyzer In addition to the sky, oceans and forests, there is an invisible, intangible, Relevant information inaudible and complex electromagnetic network in our living environment. This network is intertwined with wireless signals of various frequency bands. Although these signals are invisible and intangible, we can use a spectrum analyzer to understand and analyze these wireless signals.
  • Page 23 GRF-1300 User Manual and Teaching Materials The Frequency, Amplitude and Span keys as well as the keypad and unit keys. There are two ways to set the frequency. If the frequency of the signal that you want to measure is known, then we can set the frequency using the center frequency and span functions.
  • Page 24 RF COMMUNICATION and SIGNALS EXPERIMENTS Frequency Step6 Set the center frequencies to each of the three frequency points Step7 6. Testing the wireless signals in the environment is shown in the picture below. Antenna Experiment results Frequency: _____Amplitude:_____ Frequency: _____Amplitude:_____ Table 1-1.

  • Page 25: Experiment 2: Measuring A Baseband Waveform

    2. To understand how to use the GRF-1300 system to output a baseband signal. Set the GRF-1300 to output a 1MHz sine waveform and use the GSP-730 to Experiment measure its spectrum. The working principle of a spectrum analyzer has been principles introduced in a previous chapter.
  • Page 26 RF COMMUNICATION and SIGNALS EXPERIMENTS 4. Set the GSP-730 as follows:  Center frequency: 2.5MHz  Start frequency: 0kHz, Stop frequency: 5MHz  Reference level: 10dBm  RBW: Auto Step1 When the first step is done, steps 2 and 3 (below) will have already been automatically set.
  • Page 27 GRF-1300 User Manual and Teaching Materials Putting 10 mW into the above formula, we get 10 * log (10/1) = 10 * 1 = 10dBm. Similarly if we input 100 mW into the above formula, X = 10 * log (100mW/1mW) = 10 * 2 = 20dBm.

  • Page 28: Experiment 3: Different Baseband Waveforms And Their Harmonic Measurement

    We will become familiar with using a spectrum analyzer and how to use the Experiment contents GRF-1300 by analyzing the spectrum of a simple triangle and square wave signal. Experiment steps 1. Turn on the GRF-1300 and the GSP-730. 2. Set the GRF-1300 baseband as follows: GlobalTestSupply www.
  • Page 29  Turn the input amplitude knob clockwise to the end. Step1 Step2 Step3 3. Connect the baseband signal from the output port on the GRF-1300 to the input terminal on GSP-730 with the RF cable. 4. Set the GSP-730 as follows:  Center frequency: 15MHz ...
  • Page 30 RF COMMUNICATION and SIGNALS EXPERIMENTS 6. Select the square wave on the GRF-1300 Baseband module. Do the same spectrum measurements that were performed in the previous steps. Step8 Wave Select 7. Observe the square wave spectrum that appears on the spectrum analyzer.
  • Page 31 GRF-1300 User Manual and Teaching Materials A(t) Table 3-3. Table 3-4. 1MHz square wave spectrum test Time domain waveform of the 1MHz results. square wave. 2. For the triangle waveform, measure the harmonic ratio of the 3 and 5 harmonic. For the square waveform, measure the harmonic ratio of the 2 and 3 harmonic.
  • Page 32 RF COMMUNICATION and SIGNALS EXPERIMENTS 1. Compare the measurement results from the frequency domain and the Question time domain, and consider the relationship to the Fourier series theory. 2. Analyze the difference between the triangle and square wave spectrum. Write their Fourier series in the form of a trigonometric function. What relationship do you find between each harmonic and each term in the series? There are different ways to set the center frequency on a spectrum analyzer.

  • Page 33: Experiment 4: Measurement Of The Rf Carrier

    800mm Adapter N-SMA Experiment goals Measure an RF signal from the GRF-1300 RF & Communication Trainer. Also perform measurements on more important parameters such as phase noise and harmonic distortion. A Phase locked loop (PLL) is a phase error control system. It compares the...
  • Page 34 Measure the RF state. signal spectrum and harmonic distortion. 2. Connect the RF/FM output port on the GRF-1300 to the input terminal on GSP-730 with the RF cable. 3. Set the GSP-730 as follows:  Span: Full Span  Reference level: 0dBm ...
  • Page 35 2. Set the GRF-1300 RF Synthesizer/FM as follows:  Carrier frequency: 875MHz Step1 3. Connect the RF/FM output port on the GRF-1300 to the input terminal on GSP-730 with the RF cable. 4. Set the GSP-730 as follows:  Center frequency: 875MHz ...
  • Page 36 RF COMMUNICATION and SIGNALS EXPERIMENTS Step4 Step5 5. Record the carrier power. Set the deviation of the carrier frequency to a deviation (  of 100kHz. Use the Delta marker function on the spectrum analyzer to measure the value. Step6 Record the value, then calculate the phase noise according to the formula, and record the spectrum and measurement results in Table 4-3.
  • Page 37 GRF-1300 User Manual and Teaching Materials 1. Measurement of the RF signal spectrum. Experiment results Table 4-1. RF Signal Spectrum 2. RF Signal Harmonic measurements 2nd Harmonic measurement 3rd Harmonic measurement Table 4-2. RF Signal Spectrum GlobalTestSupply www. .com Find Quality Products Online at:...
  • Page 38 RF COMMUNICATION and SIGNALS EXPERIMENTS 3. Phase noise measurement results Table 4-3. Phase Noise measurement results Carrier power Experiment results 875MHz Carrier frequency:_____ Output power:_____ Phase noise:_____ 900MHz Carrier frequency:_____ Output power:_____ Phase noise:_____ 910MHz Carrier frequency:_____ Output power:_____ Phase noise:_____ 1.

  • Page 39: Experiment 5: Am Signal Measurement

    GRF-1300 User Manual and Teaching Materials Experiment 5: AM Signal Measurement Message signals are usually of a low frequency. In general, these low Relevant information frequency signals are not appropriate for transmission. Therefore, modulation is required to transmit messages for communication and test systems.
  • Page 40 RF COMMUNICATION and SIGNALS EXPERIMENTS (Ω=2πf Ω t (5.1) (t) = U cosΩ t = U cos2πf Ω Ωm Ωm Ω then the carrier signal is t (5.2) (t) = U cosω t = U cos2πf Because the carrier frequency remains unchanged after amplitude modulation and the amplitude of an AM wave is proportional to the modulating signal, therefore, the modulated wave can be expressed as below: (t) = U...
  • Page 41 2. Measure the spectrum of the AM wave with different carrier frequencies and with modulating signals with different amplitudes. Experiment steps 1. Turn on the power to the GRF-1300 and GSP-730. 2. Set the GRF-1300 as follows: GlobalTestSupply www.
  • Page 42 RF COMMUNICATION and SIGNALS EXPERIMENTS  Set the GRF-1300 to the default power-on state.  Connect the output port on the Baseband module to the AM in port on the AM module with an RF cable.  Connect the RF/FM output port on the RF Synthesizer/FM to the RF in port on the AM module with an RF cable.
  • Page 43 GRF-1300 User Manual and Teaching Materials Step5 Step6 6. Turn the potentiometer counterclockwise to the half-way mark. Measure the voltage with the oscilloscope. By changing the output amplitude of the modulating signal, can you observe any change in the spectrum? Record the experiment in Table 5-4.
  • Page 44 RF COMMUNICATION and SIGNALS EXPERIMENTS 11. Use the DOWN button on the RF Synthesizer/FM module to change the frequency of the carrier signal. See if there is any change to the AM wave spectrum and record it Table 5-6. Step15 Step16 1.
  • Page 45 GRF-1300 User Manual and Teaching Materials Vpp: Carrier power: :_____ Modulation index: :_____ Lower sideband power: :_____ Conclusion: 2. Changing the modulating signal frequency. Table 5-5. Experiment results: Changing the modulating signal frequency. Modulating Experiment results frequency 100kHz Carrier power: :_____...
  • Page 46 RF COMMUNICATION and SIGNALS EXPERIMENTS 600kHz Carrier power: :_____ Lower sideband power: :_____ Conclusion: 3. Changing the carrier frequency. Table 5-6. Experiment results: Changing the carrier frequency. Carrier Experiment results Frequency 882MHz 880MHz GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 47 GRF-1300 User Manual and Teaching Materials 878MHz Conclusion: 1. If we change the frequency of the modulating wave but keep the Questions amplitude the same, will the AM wave be affected? 2. If the input cables on the AM modules were switched (Connect the baseband signal to the "RF in"...

  • Page 48: Experiment 6: Fm Signal Measurement

    Experiment Item Equipment Quantity Note equipment Spectrum analyzer GSP-730 RF & Communication GRF-1300 Trainer RF wire 100mm RF wire 800mm Adapter N-SMA 1. Understand the working principals of frequency modulation. Experiment goals 2.
  • Page 49 GRF-1300 User Manual and Teaching Materials  Figure 6-1. An FM signal varying to the change of a modulating signal In the positive half-period of the modulating signal, the frequency of the modulated signal is higher than the frequency of the carrier signal. At the peak of the positive half-period, the angular frequency of the modulated signal is at its peak.
  • Page 50 RF COMMUNICATION and SIGNALS EXPERIMENTS   Assume that,     In this formula, M is called the FM index, Δω is called the maximum angular frequency deviation, its value is proportional to the amplitude of the modulating signal. 2.
  • Page 51 =2.41 =0.5 The FM circuit in the GRF-1300 uses a phase-locked loop. Using a PLL circuit for FM modulation not only solves the center frequency stability problems in direct FM modulation but also the narrow FM range limitations when using a crystal oscillator.
  • Page 52 RF COMMUNICATION and SIGNALS EXPERIMENTS  Under the default state (the state from power-up), turn the potentiometer to the minimum position.  Connect the output port on the Baseband module to the FM in port on the RF Synthesizer/FM module with an RF cable. ...
  • Page 53 GRF-1300 User Manual and Teaching Materials Step7 7. Adjust the potentiometer to the maximum position. Repeat the above steps and record the results in Table 6-2. Step8 8. After the completing the experiment steps above, see if there is any change to the spectrum of the FM wave when the UP button on the baseband module is used to change the frequency of the modulating signal.
  • Page 54 RF COMMUNICATION and SIGNALS EXPERIMENTS 1. Changing the amplitude of the modulating signal. Experiment results Table 6-2. Experimental Results: Changing the amplitude of the modulating signal Modulating Experiment result voltage Vpp: Frequency deviation: FM index: Vpp: Frequency deviation: FM index: Vpp: Frequency deviation: FM index:...
  • Page 55 GRF-1300 User Manual and Teaching Materials 2. Changing the frequency of an FM signal. Table 6-3. Experimental results: Changing the frequency of the FM signal Modulating Experimental result frequency 100kHz 300Khz 600kHz 1MHz Conclusion GlobalTestSupply www. .com Find Quality Products Online at:...
  • Page 56 RF COMMUNICATION and SIGNALS EXPERIMENTS 3. Changing the carrier frequency Table 6-4. Experimental results: Changing the carrier frequency Carrier Experimental result frequency 875MHz 880MHz 890MHz Conclusion 4. Draw a table to record the time domain waveform of the AM wave that is measured by the oscilloscope.

  • Page 57: Experiment 7: Using A Spectrum Analyzer In Communication Systems

    GRF-1300 User Manual and Teaching Materials Experiment 7: Using a Spectrum Analyzer in Communication Systems ACPR and OCBW are important parameters in the measurement of RF Relevant information modulated signals. It is very important to master using a spectrum analyzer to measure ACPR and OCBW.
  • Page 58 RF COMMUNICATION and SIGNALS EXPERIMENTS 输入信号     Figure 7-1. RF power amplifier input and output carrier ACPR  channel space bandwidth     Figure 7-2. Definition of ACPR In accordance with the definition of ACPR (Figure 7-2), we know that ACPR =10 log (P carrier...
  • Page 59 GRF-1300 User Manual and Teaching Materials 1. Measure the ACPR from the FM signal produced by the GRF-1300. Experiment contents 2. Measure the OCBW from the FM signal produced by the GRF-1300. Experiment steps 1. Turn on the GRF-1300 and GSP-730.
  • Page 60 RF COMMUNICATION and SIGNALS EXPERIMENTS 2MHz 5. Measure the ACPR and OCBW after these settings are performed. Step1 ACPR measurement Step2 Set the bandwidth of the main channel to 2MHz. Step3 Set the main channel space to 5MHz. Step4 Set the bandwidth of the 1 adjacent channel 0.8MHz.
  • Page 61 GRF-1300 User Manual and Teaching Materials Record the measurement data in Table 7-2 Step5 Adjust the frequency deviation of FM wave by adjusting the potentiometer of GRF-1300. Measure the OCBW again and record the results to table 7-2. Record the measurement data in Table 7-2 1.
  • Page 62 RF COMMUNICATION and SIGNALS EXPERIMENTS Table 7-2. OCBW measurement results OCBW％：_________ Test No. CH Power OCBW Average Describe the definition for ACPR? Questions Taking multiple measurements and the getting average value is required for Caution ACPR and OCBW measurements. Using the Average function cannot be used as it uses a logarithmic method to calculate the average.

  • Page 63: Experiment 8: Measurement Of Communication Products

    GRF-1300 User Manual and Teaching Materials Experiment 8: Measurement of communication products The computer mouse has experienced nearly four decades of evolution and Relevant development since its inception in 1968. With the popularity of consumer information oriented computers over the past decade, the mouse has seen tremendous progress.
  • Page 64 RF COMMUNICATION and SIGNALS EXPERIMENTS  Center frequency: 2.4GHz  Span: 200MHz  Reference level: -20dBm  RBW: Auto Step1 Step2 Span Step3 Amplitude Step4 3. Turn the wireless mouse on. Step5 Peak Step6 Search 4. A connection diagram is shown below. Antenna 5.
  • Page 65 GRF-1300 User Manual and Teaching Materials What are the advantages for a wireless mouse to operate in the 2.4 G Question bandwidth? Use the Peak Hold function on the spectrum analyzer to capture the signal emitted from the wireless mouse. It is not easy to dynamically measure the signal.

  • Page 66: Experiment 9: Production Line Applications

    In this experiment, we will imagine that the GRF-1300 is in a production line environment. We will use the limit line function to perform a simple test to see if a product has passed the test and return the test results using remote commands.
  • Page 67 1. Turn on the GRF-1300 and GSP-730. Experiment steps 2. Set the GRF-1300 to the power-on default state. 3. Connect the RF wire from the output port on the baseband module to the FM in port on the RF Synthesizer/FM module.
  • Page 68 Step7 6. According to the procedures above, students can set the limit lines. 7. Adjust the amplitude knob on the GRF-1300. Observe the Pass/Fail test results and record the results to table 9-1. 8. The same functionality can be achieved by sending remote commands from a PC using HyperTerminal.
  • Page 69 GRF-1300 User Manual and Teaching Materials Experiment results 5MHz frequency deviation test results. 10MHz frequency deviation test results. Table 9-1. Results for adjusting the position of the amplitude knob. GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 70: Test For Learning Outcomes

    Experiment Aim: 1. Understand how and why a phase locked loop enters the lock state or loses the lock state. 2. Have an understanding of the overall communication system. The instructor will send remote commands to the GRF-1300 and create a Experiment Contents malfunction.
  • Page 71 GRF-1300 User Manual and Teaching Materials 2: FM Fault Simulation Fault 1: Fault description: _____________________________________________________________________ __________________________________________________________________ Hypothesis: _____________________________________________________________________ __________________________________________________________________ Verification: _____________________________________________________________________ __________________________________________________________________ Fault 2 Fault description _____________________________________________________________________ __________________________________________________________________ Hypothesis: _____________________________________________________________________ __________________________________________________________________ Verification: _____________________________________________________________________ __________________________________________________________________ Fault 3 Fault description: _____________________________________________________________________ __________________________________________________________________...
  • Page 72 TEST for LEARNING OUTCOMES Fault description: _____________________________________________________________________ __________________________________________________________________ Hypothesis: _____________________________________________________________________ __________________________________________________________________ Verification: _____________________________________________________________________ __________________________________________________________________ Fault 2 Fault description _____________________________________________________________________ __________________________________________________________________ Hypothesis: _____________________________________________________________________ __________________________________________________________________ Verification: _____________________________________________________________________ __________________________________________________________________ Fault 3 Fault description _____________________________________________________________________ __________________________________________________________________ Hypothesis: _____________________________________________________________________ __________________________________________________________________ Verification: _____________________________________________________________________ __________________________________________________________________ Fault 4 Fault description: _____________________________________________________________________ __________________________________________________________________ Hypothesis:...
  • Page 73 GRF-1300 User Manual and Teaching Materials NOTES GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 74 TEST for LEARNING OUTCOMES NOTES GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 75 GRF-1300 User Manual and Teaching Materials NOTES GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
  • Page 76 TEST for LEARNING OUTCOMES NOTES GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 77: Appendix

    GRF-1300 User Manual and Teaching Materials PPENDIX We have included some commonly-used conversion tables for use with the questions. dBm Conversion Table dBm, dBuV and dBmV are all absolute units. i.e., they represent a physical quantity. The corresponding conversion tables are below:...

  • Page 78: Resistor Values In Π-Type Resistance Attenuators

    APPENDIX What is the difference between 0dBm and-50dBm? Is it 50dB or 50dBm? Question 50dB Answer 0dBm = 1mW, -50dBm = 10 mW, therefore the difference of both is 10 times Explanation which equal to 50dB or a difference of 0.99999mW And 0.99999mW is equal to -0.0000434dBm ≈...

  • Page 79: Resistor Values In T-Type Resistance Attenuators

    GRF-1300 User Manual and Teaching Materials Resistor Values in T-type Resistance Attenuators 50Ω 50Ω 2.88 433.34 2.88 5.73 215.24 5.73 8.55 141.93 8.55 11.31 104.83 11.31 14.01 82.24 14.01 16.61 66.93 16.61 19.12 55.80 19.12 21.53 47.31 21.53 23.81 40.59 23.81...

  • Page 80: Modulation Index And Sideband Amplitude Comparison Table

    APPENDIX Modulation Index and Sideband Amplitude Comparison Table GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...

  • Page 81: Declaration Of Conformity

    GRF-1300 User Manual and Teaching Materials Declaration of Conformity GOOD WILL INSTRUMENT CO., LTD. No. 7-1, Jhongsing Rd, Tucheng Dist., New Taipei City 236. Taiwan. GOOD WILL INSTRUMENT (SUZHOU) CO., LTD. No. 69 Lushan Road, Suzhou City(Xin Qu), Jiangsu Sheng, China. declare that the below mentioned product Type of Product: RF &...

Table of Contents