B&K 4070A External FSK Mode, Ext FSK Mark 1,000,000.00 Hz Space 2,000,000.00 Hz 10.0 dBm

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5.10 External FSK Mode

Introduction

External FSK Frequency Shift Key generates a frequency shift keyed signal of fixed amplitude. External signal is used to toggle the output signal frequency between mark frequency and the space frequency. Mark and space frequencies, level and DC offset values could be manually entered from the front panel keypad in this mode.

External signal gating option is available in this mode. External FSK mode could be entered by pressing “Mode”> “FSK” >”2” key at any time.

External FSK Mode Parameters

The External FSK mode has the following front panel display:

			Ext FSK:	Mark: 1,000,000.00 Hz
			Ext FSK:	Mark: 1,000,000.00 Hz
			Space: 2,000,000.00 Hz	-10.0 dBm
2
2

Figure 5.10-1: External FSK mode display

1. Mark Frequency

1

3

In this field enter the Mark frequency, from 0 Hz (DC) to 21.5 MHz in 0.01 Hz steps. When the voltage on the Ext FSK In connector is high (+3V to +10V), the output frequency will be set to this value.

2. Space Frequency

In this field enter the Space frequency, from 0 Hz (DC) to 21.5 MHz in 0.01 Hz steps. When the voltage on the Ext FSK In connector is low (0V to -10V), the output frequency will be set to this value.

3. Level

In this field enter the output level, from 4 mVp -p to 10 Vp -p in 1 mV steps or from -44.0 dBm to +24.0 dBm in 0.1 dBm steps.

NOTE: For wideband FSK (where the difference between Mark and Space frequencies is > 1.0 MHz), the output level may shift slightly between the mark and space frequencies. The 4070A has internal leveling circuitry, which is disabled in this mode, in order to offer faster FSK switching rates.

NOTE: The level specified is a 50O loaded level. This is the level of the signal, which will appear across a 50O load connected to the SIG Out connector. Into an open circuit, the output swing will be twice the value entered.

Offset

By pressing this key, you may enter an offset voltage for the output signal. For more information on output offsets refer to section 4.4.

Ext FSK Input

Apply the digital data to be modulated to this connector. When this input is high, the output frequency is set to the Mark value. When this input is low, the output frequency is set to the Space value. For more information on this input refer to chapter 2.0.

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BK Precision 4070A User Manual Rev.2.2

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Contents User’s Manual Page Model 4070A User’s Manual +K Precision CorpTable of Contents Warranty information Remote operationArbitrary waveform system DC Operation OptionIntroduction Description Feature summary ModesSync out connector Installation and setupSIG Out connector External Modulation In connector External Trigger/Gating/FSK/BPSK input External Reference Input / Ext Arb. Clock connector External Arb Sync In / Out connectorRS232 Interface connector Line in connectorMode key Operating controls and keysField arrow keys Recall / Store keyNumeric keys 0 to 9, Trigger keyÉ, ê, è, ç keys Clear key One Touch Mode KeysMHz/dBm, KHz/Vp-p/Sec, Hz/mVp-p/mS keys Operating mode selection Operating guideChanging frequency Changing levelModifying an existing value Changing valuesEntering a new value Basic Sinewave CW Mode Mode descriptionsSinewave Mode 000,000.00 Hz 10.0 dBm Internal AM Mode External AM Mode External AM Mode ParametersExternal AM Input gain 000,000.00 Hz PEP level -10.0 dBm Input GainInternal FM Mode Internal FM Mode ParametersInt FM 1,000 Hz Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Peak Frequency DeviationExternal FM Mode Parameters External FM ModeExternal FM Pk dev 10,000 Hz 000,000.00 Hz 10.0 dBm Internal PM Mode Internal PM Mode ParametersPeak Phase Deviation Int PM 1,000 Hz Pk dev 180 deg 000,000.00 Hz 10.0 dBmExternal PM Mode Parameters External PM ModeExternal PM Pk dev 180 deg 000,000.00 Hz 10.0 dBm Sweep Mode Up / Down sweep Sweep timeInternal FSK Mode Internal FSK Mode ParametersMark Frequency Space FrequencyExternal FSK Mode External FSK Mode ParametersExt FSK Mark 1,000,000.00 Hz Space 2,000,000.00 Hz 10.0 dBm Ext FSK InputBurst Mode Trig Ton 10,000 mS 000,000.00 Hz Off 10.0 dBm Burst Mode IntroductionBurst frequency Internal SSB Mode Internal SSB Mode ParametersInt SSB 1,000 Hz Upper Sideband 000,000.00 Hz 10.0 dBm Upper/Lower Sideband selectionsExternal SSB Mode Parameters External SSB ModeExternal SSB Upper Sideband 000,000.00 Hz +10.0 dBm Dtmf Generation Mode Dtmf generation # Duration 200 mS Delay Level -10.0 dBmDtmf Generation Mode Parameters BackgroundDtmf Delay Dtmf DurationDtmf Detection Mode Dtmf Detection Mode ParametersDtmf detection on Ext Mod input 3 # a Dtmf detected digitsPower & Voltage Measurement Mode Power & Voltage Measurement Mode ParametersPower Level Voltage LevelRemote Mode Arbitrary ModeOther mode Internal Bpsk Mode Parameters Internal Bpsk ModeInt Bpsk 1,000 Hz 000,000.00 Hz 10.0 dBm External Bpsk Mode Parameters External Bpsk ModeExternal Bpsk 000,000.00 Hz 10.0 dBm Dualtone Generation Mode 10,000 Hz F2 Ton 000 mS Toff 10.0Dualtone Examples Data Modulation Mode Using the Data Modulation ModeData Modulation Mode Parameters Baud RateDownloading Modulation Message Data Example MessageTriggering the Transmission Saving the MessageVoltage Controlled Oscillator VCO Mode VCO Mode ParametersStart End 1,000,000.00 Hz 10.0 dBm End FrequencyRemote Operation ConnectingChecking your connection with Hyper Terminal Remote Control Operation Remote Control Programming RulesRemote Control Commands Reset 4070A to Sine wave mode× Ø Returns CE1,0 Enable, Disable LCD echo to terminal K1.0 Enable, Disable front panel keys and rotary knobReport hardware and software versions Linear Trig Up Time 10,000 mS F0-9 Move cursor to field 0 to? or H Print help menu Return a CRemote Control Examples ExampleQuick Start Guide Arbitrary Waveform ModePin 9-pin cable Pin 25 pin cable adapter Introduction to the Arbitrary Waveform System Description of the Arbitrary Waveform GeneratorSwitching Modes Feature SummaryFunction Generator Pulse GeneratorArbitrary Waveform Mode Int Clock / Ext Clock / Lock Master Lock slave modePhase Continuous/Triggered modeFunction Generator Mode Function Gen Wave Pos Ramp Rep Freq 100,000 Hz 000 mVWaveform Repetition FrequencyPositive Only Pulse Generator ModeDuty Cycle Using WAVELOAD.EXE Downloading arbitrary waveformsSaving Arbitrary Waveforms Cwaveload /COMx /y /baudz filename.extUsing your own program Floating Point Format Data FormatsRules for Floating Point format Time & Value Floating Point Format Example #2Digital Format Integer Format Rules for Hexadecimal format Hexadecimal FormatExample The data value E468 is handled as follows Rules for Binary format Binary FormatExample Arb Multiple Units LockingGenerator More on Phase Offsets Phase ResolutionStarting Address = Number of waveform points * Phase Offset Waveform Size RestrictionsExample Arb Program Program Listing ARB.BASClose System Subroutines Return Print #1, a Send integer value to 4070A Return Return Wiring Diagram DC Operation Option4070A Specifications Operating ModesSoftware CD RemoteHardware Setup Appendix aCLS CLS Print Print Subroutines END SUB Television Remote Control Example Appendix BCLS Make sure a 4070A is attached to the serial port Print Limited Two-Year Warranty Service Information Savi Ranch Pkwy Yorba Linda, CA 92887 USA TEL