Ramsey Electronics SG560 Guía de usuario Pagina 64
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ADVANCED FEATURES
4.40 Sweep Generator
The sweep generator is used for testing frequency response of filters, flatness of cables, and
similar tests. This function can be used in conjunction with a spectrum analyzer or the self-
calibrated RSSI meter on the COM3010 with the LINK activated.
On the GENERATE screen:
The FB Field represents the Frequency at which the sweep begins. It is accessed through the
GENERATE key. Any frequency from 100 kHz to 1000 MHz can be entered.
The FE Field represents the Frequency at which the sweep is to end. This is accessed through
the FM key. Again any frequency from 100 kHz to 1000 MHz can be entered.
The L Field represents the RF Level to be used. It may be accessed through the LEVEL key.
Levels from 0 dBm to -140 dBm can be entered and the mV and uV scales may also be used.
The DLY Field represents the time between changes in frequency. Access is obtained through
the COUNT key and selected through the UP/DOWN arrow keys. The time between changes
in frequency will depend on whether internal or external modulation is turned on. Usually
sweeps will be performed with the modulation off. Slowing the sweep speed will allow the
slower response of the receiver RSSI to be indicated when you are sweeping filters.
On the RECEIVE screen:
The TYPE field contain three types of sweeps to choose from. Access to this field is gained
through the RECEIVE FM key. The Log methods will take increasingly larger steps as the
sweep goes up in frequency, so there will be more points at low frequencies than at high
frequencies; this is determined by the Log function selected. The types of sweeps available
are:
Linear- which produces a linear sweep with even frequency spacing.
Decade- produces a sweep where the frequency step sizes increase by a factor of 10.
Octave- produces a sweep where the step sizes increase by a factor of 2.
The NUM field selects the number of points or frequencies to be included in the sweep. It is
accessed through the RECEIVE AM key. The user can select from 1 to 10,000 points by direct
entry from the keypad or scrolling with the UP/DOWN arrows. For example, if there are 555
points for a sweep from 10 MHz to 1 GHz they will be stepped at 25mS intervals which will
be an entire sweep time of 0.025*555 = 13.8 seconds. The steps are rounded to the nearest
Generate Frequency step size unless you have rounding turned off in the Options menu. If
the step size is set to a large value and the number of points you wish to sweep makes for a
smaller step size, the COM3010 will display an error telling you that some of the points will
not be swept. The remedy is to reduce the Generate Frequency step size before sweeping.
This feature allows you to sweep directly on channel steps if desired.
RECEIVE Level Meters
Counter Freq Meters
GENERATE TX Level
Modulation Seq/Reg
- COM3010 SERVICE MONITOR 1
- 1.00 INTRODUCTION 5
- 1.01 Opening the Box 6
- 1.02 Overview 8
- 2.00 BASIC OPERATION 13
- 2.01 Generating a Frequency 14
- Modulation Seq/Reg 15
- GENERATE TX Level 15
- 2.05 Muting the Generator 16
- External 17
- 2.06.03 Generating CTS 20
- 2.06.04 Generating DCS 21
- 2.06.05 Modulation Steps 22
- RECEIVE Level Meters 23
- Counter Freq Meters 23
- 2.07 Receiving a Frequency 25
- 2.11 Using the Level Meters 29
- 3.10 Transmitter Tests 35
- 3.10.02 Power Measurements 37
- H, depending on frequency 39
- 3.20 Receiver Tests 41
- 3.20.02 SINAD Measurements 42
- 3.20.05 Two-Tone Paging 46
- FIGURE-1 51
- ISO-T CALIBRATION 51
- FIGURE-2 52
- DESENS TEST SETUP 52
- REPEATER 52
- RX PASS – RECEIVER SIDE 54
- TX PASS – TRANSMITTER SIDE 55
- 4.00 ADVANCED FEATURES 57
- 4.10 Memories 58
- Memories (Continued) 59
- 4.20 Smart Link 61
- 4.30 Scanner 62
- 4.30 Scanner (Continued) 63
- 4.40 Sweep Generator 64
- 4.50 User Options: 66
- General Options: 67
- On the GENERATE screen: 67
- General Options (Continued) 68
- On the RECEIVE screen: 68
- Serial Port Options 68
- Clear Memories: 69
- 4.60 Battery Power Saver 69
- 5.00 USER CALIBRATIONS 71
- 5.00 USER CALIBRATIONS 72
- 6.00 DETAILED INFORMATION 77
- Attenuator Table 80
- 6.50 RS232 Communications 83
- 6.50.02 SYS Commands 86
- 6.50.03 SET Commands 87
- 6.50.04 MEM Commands 89
- 6.50.05 GET Commands 90
- 7.00 APPENDIX 95
- APPENDIX B 98
- CTS TONE FREQUENCY LIST: 98
- APPENDIX C 98
- DCS CODE LIST: 98
- APPENDIX D 99
- TWO TONE MODES: 99
- APPENDIX E 99
- GENERAL OPTIONS TABLE 99
- COM3010 SPECIFICATIONS 100
- Certification 103
- Warranty 103
- COM3010 104
- January 2005 104
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