Harris Platinum Series Technical Manual

Harris Platinum Series Technical Manual Manual pdf 70 page image

dress and abrasions. High-current wires may be physically joltedfrom their positions by current surges at turn-on.RF cables rarely give trouble, but should be checked for tightconnection. Inspect for signs of cables being pinched at slidingassemblies (exciter and slave controllers).5.8 Inspect MOVsPeriodically visually inspect all MOVs to ensure proper transientprotection. Replace if any damage is suspected, especially afterthunderstorms.5.9 Recommended Test EquipmentSee Table 5-3.5.10 Annual and Leap Year Clock AdjustmentThe 24-hour clock/calendar function in the transmitter needs tobe set to the new year annually.The calendar does not recognize Feb 29. In a leap year, the dateadvances to March 1 on that date and must be reset to March 1the following day.Use the Enter Time and Date selection in the front panel SETUPmenu to display the TIME AND DATE ENTRY SCREEN. Theprocedure for using this screen to set the date and time may befound in Section III of this technical manual.5.11 RF Power Measurements5.11.1 Through-Line MetersThrough-line wattmeters of known accuracy are acceptable forpower measurements. However, once calibrated, the line section,sensing element, and meter must be used together as a set. Themeter range should be chosen so that the measurement falls inthe upper third of the scale movement. Different power rangeelements may be required for aural or individual visual PAmeasurements.5.11.2 Calorimetric MeasurementsThree measurements are required to use a water-cooled cal-orimetric RF load to determine average power: flow rate throughthe load in gallons per minute (G.P.M.), and water temperaturesin degrees Celsius at the calorimeter inlet (Tin) and outlet (Tout).If water is used to cool the load, the following formula applies:P average (kW)= 0.264 x (Tout -Tin) x G.P.M.CAUTIONThe factor 0.264 in the above formula applies only if water is used as thecoolant in the load. If a glycol coolant mixture is used, consult the glycolsupplier to obtain the correct specific gravity factor based on their coolantformulation.The formula listed in paragraph 5.11.3 for your transmittersystem can then be used to convert the resulting average powerfigure to a peak-of-sync power level.Vestigial Sideband Demodulator Tektronix 1450 or EquivalentOption 1 37 MHz IF, NTSC CCIR-M (USA and others)Option 2 38.9 MHz IF, CCIR-G, PALTektronix Sideband AnalyzerConsisting of:1405 Sideband Adaptor2710, 490, or 2750 Spectrum AnalyzerTektronix 1910 Signal Generator or equivalentTektronix 1780 Video Measurement SetAural Stereo Generator, Orban 8182A ro equivalentAural Demodulator Tektronix 751, TFT-850, or equivalent forstereoTime & Frequency Technology 701, 702, or equivalent formonauralA method of measuring transmitter frequency with twosources. (Frequency Counter, Frequency Counter on De-modulator, Outside Frequency Measuring Service.)Audio Oscillator and Distortion Analyzer (Sound Technology1710A or equivalent).Boonton 92C RF Voltmeter with 50 ohm adaptorAsaca 201-1 Envelope Delay Measuring SetScope CameraVarious RF Adaptors and ConnectorsType N plug to BNC jackType BNC plug to Subminiax PlugType BNC plug to Subminiax JackType BNC barrelBird Model 43 Wattmeter with elements from 1W to 1000WAdaptor 1 5/8" coax to N connectorManometer Dwyer model 40-1 (range 0.1-0-1.0"WC) or equalTee kit Dwyer A-604T or equalFluke Multimeter and Style C Current ProbeTable 5-3. Recommended Test Equipment5-4 888-2365-001 Rev. B: 1/11/1999WARNING: Disconnect primary power prior to servicing.