Harris Platinum HT EL 2000LS Technical Manual

Harris Platinum HT EL 2000LS Technical Manual Manual pdf 50 page image

5.7.3.1 Transmitter Visual Forward Power Calibrationa. Adjust the transmitter vision output power to the correctaverage value calculated using information in paragraph5.6.2.b. Connect a DVM to the Interface Logic Board 1A7 TP8(Visual Forward Power).c. Adjust R39 (VIS FWD CAL) for 2.6 V at TP8.d. Select VIS FWD on the Exciter Meter.e. On the Exciter Meter Adjust R5 (VIS FWD CAL) for anumeric reading of 2000.f. Adjust R101 (VIS FWD CAL) for full scale reading onthe Bar Graph.5.7.3.2 Transmitter Visual Reflected Power Calibrationa. Connect the visual reflected power sample cable to theforward power port of the visual output directional cou-pler.b. Connect a DVM to the Interface Logic Board 1A7 TP7(Visual Reflected Power).c. Adjust R13 (VIS REF CAL) for 1.46 V at TP7. This is 5Db less for the coupler ratio.d. Select VIS REF on the Exciter Meter.e. Adjust R6 (VIS REF CAL) for a numeric reading of 2000.f. Adjust R99 (VIS REF CAL) for full scale reading on theBar Graph.5.7.3.3 Transmitter Aural Forward Power Calibrationa. Adjust the transmitter aural RF output to 200 watts CW.b. Connect a DVM to the Interface Logic Board 1A7 TP6(Aural Forward Power).c. Adjust R16 (AUR FWD CAL) for 2.6 V at TP6.d. Select Aural FWD on the Exciter Meter.e. On the Exciter Meter Adjust R7 (AUR FWD CAL) for anumeric reading of 200.0 watts.f. Adjust R100 (AUR FWD CAL) for full scale reading onthe Bar Graph.5.7.3.4 Transmitter Aural Reflected Power Calibrationa. Connect the aural reflected power sample cable to theforward power port of the aural output directional coupler.b. Connect a DVM to the Interface Logic Board 1A7 TP5(Aural Reflected Power).c. Adjust R23 (AUR REF CAL) for 1.3 V at TP5. This is 6Db less for the coupler ratio.d. Select AURAL REF on the Exciter Meter.e. Adjust R8 (AUR REF CAL) for a numeric reading of200.0 watts.f. Adjust R98 (AUR REF CAL) for full scale reading on theBar Graph.5.7.4 VSWR Fault And Foldback Adjustments5.7.4.1 Initial Setup for Adjustmenta. Start with the transmitter OFF.b. Reduce Visual and Aural Exciter output to zero.c. Place JP1 and JP2 in 2-3 position to disable foldback.5.7.4.2 Visual High VSWR Adjustmenta. Move the coax cable 1A7P7 from 1A7J7 to 1A7J8.b. Select the VIS REF meter position.c. Turn on the transmitter and slowly increase visual outputpower until the VIS REF meter reads 200 watts. This isthe level for a VSWR of 2.0:1.d. Adjust R69 (VIS HIGH VSWR), on 1A7 (Interface logicBoard), until the HIGH VSWR light on the Exciter justlights and the voltage on 1A7 TP11 changes from 5V to0V.5.7.4.3 Visual VSWR Foldback Adjustmenta. Reduce the visual power to zero.b. Move the jumper JP1 to 1-2 position to enable the fold-back function.c. Slowly increase the visual output power until the VIS REFmeter reads 20 watts. This is the level for a VSWR of 1.2:1.d. Adjust R48 (VIS FB SET), on 1A7 (Interface LogicBoard), until the FOLDBACK ACTIVE light on the Ex-citer just lights.e. Restore the visual sample coaxes to the proper location.5.7.4.4 AURAL HIGH VSWR Adjustmenta. Move the coax cable 1A7P9 from 1A7J9 to 1A7J10.b. Select the AURAL REF meter position.c. Turn on the transmitter and slowly increase Aural outputpower until the AURAL REF meter reads 20 watts. Thisis the level for a VSWR of 2.0:1.d. Adjust R74 (AUR HIGH VSWR), on 1A7 (Interface logicBoard), until the HIGH VSWR light on the Exciter justlights and the voltage on 1A7 TP12 changes from 5 V to0.5.7.4.5 Aural VSWR Foldback Adjustmenta. Reduce the aural power to zero.b. Move the jumper JP2 to 1-2 position to enable the fold-back function.c. Slowly increase the visual output power until the AURALREF meter reads 5.5 watts. This is the level for a VSWRof 1.4:1.d. Adjust R53 (AUR FB SET), on 1A7 (Interface LogicBoard), until the FOLDBACK ACTIVE light on the Ex-citer just lights.e. Restore the visual sample coaxes to the proper location.5.8 Transmitter AGC Adjustment5.8.1 Visual AGC:a. Preset the following:1. JP12 to position 2-3 AGC out2. JP13 to positions 1-2 and 3-4 3 dB Attenuator out3. JP14 to positions 1-2 and 3-4 2 dB Attenuator outb. Turn on the transmitter ON and increase the visual drivefor 2000 watts peak of sync with a black picture.Platinum™ Series5-4 888-2457-001WARNING: Disconnect primary power prior to servicing.