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Axcera 430B Manual

1000 watt high-band vhf transmitter
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FCC TYPE ACCEPTANCE REPORT
430B
1000 WATT HIGH-BAND
VHF TRANSMITTER
AXCERA, LLC
103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA
(724) 873-8100 • FAX (724) 873-8105
www.axcera.com • info@axcera.com

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  • Page 1 FCC TYPE ACCEPTANCE REPORT 430B 1000 WATT HIGH-BAND VHF TRANSMITTER AXCERA, LLC 103 FREEDOM DRIVE P.O. BOX 525 LAWRENCE, PA 15055-0525 USA (724) 873-8100 • FAX (724) 873-8105 www.axcera.com • info@axcera.com...

  • Page 2: Table Of Contents

    1.4 Rear view, Axcera-430B Transmitter w/Manufacturer's Label ....1-2 CHAPTER 2 EXTERNAL PHOTOS 2.1 Front view, complete Axcera-430B Transmitter ........2-1 2.2 Rear view, Axcera-430B Transmitter (rear top of cabinet) ....... 2-2 2.3 Rear view, Axcera-430B Transmitter (rear bottom of cabinet)....2-3 2.4 Output Bandpass Filter..............2-4...
  • Page 3 7.2.12.13 IF Attenuator Board ...........7-18 7.2.12.14 x4 Multiplier Board .............7-18 7.2.12.15 VHF Filter/Mixer Board ..........7-19 7.2.12.16 High-Band VHF Filter/Amplifier Board......7-19 CHAPTER 8 OPERATIONAL DESCRIPTION - MODEL Axcera-430B 8.1 General Description ................. 8-1 8.2 Technical Specifications..............8-1 8.3 Performance Specifications..............8-1 8.4 System Overview ................

  • Page 4: Chapter 1 Id Label/Location Info

    Axcera-430B FCC Type Acceptance Report ID Label/Location Info 1. ID LABEL/LOCATION INFO Front Panel FCC Label 1.2 Rear Panel Manufacturer’s Label February 2004...

  • Page 5: Front View, Axcera-430B Transmitter W/Fcc Label

    Axcera-430B FCC Type Acceptance Report ID Label/Location Info 1.3 Front view, Axcera-430B Transmitter with FCC ID Label 1.4 Rear view, Axcera-430B Transmitter with Manufacturer’s Label February 2004...

  • Page 6: Chapter 2 External Photos

    Axcera-430B FCC Type Acceptance Report External Photos 2. EXTERNAL PHOTOS 2.1 Front view, complete Axcera-430B Transmitter February 2004...

  • Page 7: Rear View, Axcera-430B Transmitter (Rear Top Of Cabinet)

    Axcera-430B FCC Type Acceptance Report External Photos 2.2 Rear view, Axcera-430B Transmitter (rear top of cabinet) February 2004...

  • Page 8: Rear View, Axcera-430B Transmitter (Rear Bottom Of Cabinet)

    Axcera-430B FCC Type Acceptance Report External Photos 2.3 Rear view, Axcera-430B Transmitter (rear bottom of cabinet) February 2004...

  • Page 9: Output Bandpass Filter

    Axcera-430B FCC Type Acceptance Report External Photos 2.4 Output Bandpass Filter Assembly February 2004...

  • Page 10: Chapter 3 Schematics

    Axcera-430B FCC Type Acceptance Report Schematics 3. SCHEMATICS The schematics for the Axcera-430B system are provided as separate PDF files. February 2004...

  • Page 11: Chapter 4 Test Report

    Axcera-430B Type Acceptance Report Test Report 4. TEST REPORT 4.1 RF Power Measurements Figure 4-1 shows the test equipment setup for the RF power measurements. Narda Directional Coupler Bird Tektronix Transmitter Bird 50 Ohm TSG95 Under Test Model 43 Termination...

  • Page 12: Modulation Characteristics

    Axcera-430B Type Acceptance Report Test Report 4.2 Modulation Characteristics 4.2.1 Video Modulation The test setup shown in Figure 4-1 was used to adjust the video signal to obtain a white picture level. Using the Tektronix 1350 demodulator chopper function, the modulation was accurately measured to be 87.5% while maintaining a depth of modulation at...

  • Page 13: Video Envelope Delay

    Axcera-430B Type Acceptance Report Test Report 4.2.2 Video Envelope Delay Using the test setup in Figure 4-1, the envelope delay was measured and the data recorded as shown in Table 4-1. A sinx/x test pattern was used. Table 4-1. Envelope Delay Measurements...

  • Page 14: Rf Sideband Response

    Axcera-430B Type Acceptance Report Test Report Table 4-2. Detected Video Frequency Response VIDEO FREQUENCY RELATIVE RESPONSE 200 kHz +2 dB 500 kHz 0 dB 750 kHz 0 dB 1.0 MHz +0.1 dB 1.25 MHz 0 dB 1.5 MHz 0 dB 2.0 MHz...
  • Page 15 Axcera-430B Type Acceptance Report Test Report Table 4-3. RF Sideband Response OUTPUT FREQUENCY VIDEO FREQUENCY RESPONSES (MHz) 175.25 Carrier 175.45 +200 KHz 0 (reference) 175.50 +250 -1.0 175.75 +500 -4.0 176.00 +750 -4.1 176.25 +1000 -4.0 177.25 +2000 -4.0 178.25 +3000 -4.4...

  • Page 16: Audio Modulation

    Axcera-430B Type Acceptance Report Test Report 4.2.6 Audio Modulation The FM deviation and distortion was measured using the test setup shown in Figure 4-5. 50 Ohm Tektronix Transmitter Coupler Load TSG95 Under Test Video Video Generator Input Audio Input Amber 3501...

  • Page 17: Am And Fm Noise

    Axcera-430B Type Acceptance Report Test Report Note: The HP modulation analyzer provides a calibrated audio output level that is suitable for determining the FM deviation. De-emphasis can be switched on or off for this measurement; it was switched off for the purposes of these tests. For the distortion measurements, the de-emphasis was switched on (pursuant to 73.687.b.3[I] of the FCC rules).
  • Page 18 Axcera-430B Type Acceptance Report Test Report Figure 4-7. Channel-Occupied Bandwidth Figure 4-8. Aural Carrier-Occupied Bandwidth February 2004...

  • Page 19: Conducted Spurious Emissions

    Axcera-430B Type Acceptance Report Test Report 4.4 Conducted Spurious Emissions Using the test setup shown in Figure 4.1, the spectrum outside of the specified channel was observed and the data was recorded on all products above the 70-dB noise floor of the spectrum analyzer.

  • Page 20: Radiated Emissions

    Axcera-430B Type Acceptance Report Test Report Figure 4-10. Products Above the 70-dB Noise Floor of the Spectrum Analyzer (2 of 2) 4.5 Radiated Emissions Using the test setup shown in Figure 4-11, with the transmitter operating at full power, the spectrum analyzer was moved 20 meters from the transmitter and connected to a dipole antenna cut to 175 MHz.
  • Page 21 Axcera-430B Type Acceptance Report Test Report Video Transmitter 50 Ohm Under Generator Termination Test 20 Meters HP 8560E Spectrum Dipole Analyzer Figure 4-11. Test Setup for Measuring Radiated Emissions Three levels were compared to the following reference level. If all of the power of the transmitter was radiated by an isotropic radiator, the power density at 20 meters would be: P = Pt/4πR...

  • Page 22: Frequency Stability

    Axcera-430B Type Acceptance Report Test Report With the receive dipole antenna cut to 175.25 MHz, the cabinet radiation was also checked, within very close proximity to the trays of the transmitter, and the received level that was recorded, and is shown below, did not exceed a power density above -6dBm: Pr/A = 0.025 mw/cm...
  • Page 23 Axcera-430B Type Acceptance Report Test Report Table 4-11. Calculated Frequency Errors 45.75-MHz OVEN DUAL OVEN TOTAL OUTPUT OSCILLATOR OSCILLATOR TEMP (° ° C) ERROR ERROR ERROR (kHz) ∆ ∆ kHz ∆ ∆ -0.068 -0.644 0.061 -0.032 -0.371 0.057 -0.031 -0.305 0.043...

  • Page 24: Test Equipment

    Axcera-430B Type Acceptance Report Test Report 4.7 Test Equipment The test equipment that was used to analyze the Axcera-430B system is listed in Table 4-13. Table 4-13. Test Equipment MODEL MANUFACTURER DESCRIPTION SERIAL # TSG95 Tektronix Video Generator 10647 1350...

  • Page 25: Chapter 5 User's Manual

    Axcera-430B Type Acceptance Report Users Manual 5. USER’S MANUAL The user’s manual for the Axcera-430B system is provided as separate Word and PDF files. February 2004...

  • Page 26: Chapter 6 Internal Photos

    Axcera-430B FCC Type Acceptance Report Internal Photos 6. INTERNAL PHOTOS 6.1 Top view, Exciter Tray February 2004...

  • Page 27: Top View, 600-Watt Amplifier Tray

    Axcera-430B FCC Type Acceptance Report Internal Photos 6.2 Top view, 600-watt Amplifier Tray February 2004...

  • Page 28: Chapter 7 Parts List/Tune-Up Info

    -VHF coupler -VHF splitter/combiner assemblies 7.2 Tune-up Information The 430B transmitter was aligned at the factory and should not require additional alignments to achieve normal operation. This transmitter operates using the baseband audio and video inputs or, if the (optional) 4.5-MHz composite input kit is purchased, either a single composite video + 4.5-MHz...

  • Page 29: High-Band Vhf Exciter T Ray With Baseband Video And Audio

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Switch on the main AC and the VHF exciter circuit breakers on the AC distribution panel behind the rear cabinet door. 7.2.1 High-Band VHF Exciter Tray with Baseband Video and Audio Inputs The (A4) high-band VHF exciter tray (1070901) has adjustments for video levels, audio modulation levels, and other related parameters.

  • Page 30: Vhf Exciter Tray With Either Baseband Or 4.5-Mhz Composite Input

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Adjust C19 for an overall peak-to-peak variation of less than ±.3 dB from 4.4 MHz to 4.6 MHz. Recheck the frequency response; it may have changed with the adjustment of the envelope delay.

  • Page 31: Linearity Corrector Adjustment

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Locate (A9) the IF phase corrector board (1227-1250) mounted in the VHF exciter. The amplitude correction portion of the board is not utilized in this configuration. As a result, jumper W3 on J10 should be in the Disable position, to +6.8 VDC, and R35 and R31 should be fully counter-clockwise (CCW).

  • Page 32: Phase And Gain Adjustment Of The Vhf Amplifier Trays

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Adjust pots R34, R37, and R40 CW on the IF ALC board, as needed, to give correction at sync or at low luminance levels as viewed at the left-most edge of the waveform monitor.

  • Page 33: Calibration Of The Reflected Output Level Of The Transmitter

    Note: The bandpass filter is factory swept and should not be tuned without the proper equipment. Do not attempt to tune the filters without a sweep generator or, preferably, a network analyzer. If tuning is required, consult the Axcera Field Support Department before attempting to make any adjustments.

  • Page 34: Vhf High-Band Amplifier Trays

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info To tune the filter, connect a sweep signal to the input of the filter and adjust the five tuning bolts for a 6-MHz bandwidth and a flat-frequency response across the desired band.

  • Page 35: High-Band Vhf Driver Pallet

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info The idling current, no RF drive applied, of the device Q1 is set for 250 mA. To set the current, remove the RF drive, measure the voltage across R20 (two 1Ω resistors in parallel on the filter/amplifier board) and adjust R13 for .125 volts (using Ohms’...
  • Page 36 Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info 2. Connect a sync and black test signal to the video input jack of the remote interface panel. 3. Adjust manual gain pot R5 on the AGC control board for: • Sync + black 0 IRE setup; wattmeter=360 watts Sync + black 7.5 IRE setup;...

  • Page 37: Board Level Alignment Procedures

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info 7.2.12 Board Level Alignment Procedures 7.2.12.1 (Optional) 4.5-MHz Composite Input Kit If the (optional) 4.5-MHz composite input kit is purchased, the tray is capable of operating by using either the 4.5-MHz composite input or the baseband audio and video inputs.

  • Page 38: Optional) 4.5-Mhz Bandpass Filter Board

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info response. Adjust R32, video gain, for a signal level of 1 Vpk-pk on the oscilloscope. The output at J6 and J7 on the board should be video-only, without the 4.5-MHz aural subcarrier.
  • Page 39 Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Step 9 below describes how to set the modulation depth through the use of a television demodulator or a zero-spanned spectrum analyzer tuned to the visual IF frequency. Figure 7-1. Waveform The following test setup is for the adjustment of the depth of modulation and ICPM at IF: Remove the cable that is on J18 and connect the double-sideband, 45.75-MHz...

  • Page 40: Aural If Synthesizer Board, 4.5 Mhz

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Set the waveform monitor to display ICPM. Preset R53 fully CCW, adjust C78 for the greatest effect at white on the ICPM display, and then adjust R53 for minimum ICPM. Recheck the depth of modulation and, if necessary, adjust R152, depth of modulation.

  • Page 41: Alc Board (Part 1 Of 2)

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Center the aural carrier on the spectrum analyzer with the spectrum analyzer set to the following: Frequency/Division – 10 kHz Resolution bandwidth – 3 kHz Time/Division – 50 msec Trigger – Free run Adjust L5 for approximately +3.5 VDC at TP2.

  • Page 42: If Phase Corrector Board

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info To align the ALC board, preset the following controls on the tray: A. ALC Board (1265-1305) Connect jumper W1 on J4 to Disable, between pins 2 and 3 (to disable linearity correctors). Connect jumper W3 on J6 to Manual, between pins 2 and 3 (for manual gain control).

  • Page 43: Channel Oscillator Board, Dual Oven

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info Disconnect the plug that is on J12, the IF output, and monitor J12 with a spectrum analyzer. Verify an output of approximately 0 dBm. If necessary, adjust R99 to increase the output level. If less of an output level is needed, move jumpers J27 and J28 to pins 2 and 3 and then adjust R99.

  • Page 44: If Attenuator Board

    Axcera-430B FCC Type Acceptance Report Parts List/Tune-up Info the station a means of automatically repeating its identification call sign at a given time interval to meet FCC requirements. The starting circuit is made up of U1B and U1D, which are connected as a flip-flop, with gate U1A used as the set.

  • Page 45: High-Band Vhf Filter/Amplifier Board

    Reconnect the cable from J6 to J1 on the filter/amplifier board. Monitor J2, the RF output of the board, and peak C17 for the maximum signal level. Tune manual gain adjust R9 for a +8 dBm peak visual output. This completes the tune-up procedures for the 430B transmitter. February 2004 7-18...

  • Page 46: Chapter 8 Operational Description - Model Axcera-430B

    8. OPERATIONAL DESCRIPTION - MODEL AXCERA-430B General Description The 430B is a complete 1000-watt VHF solid-state internally diplexed television transmitter. It operates at a nominal visual output power of 1000 watts peak sync and an average aural output power of 100 watts, at an A/V ratio of 10 dB, 10% sound, or 50 watts at 13 dB, 5% sound.
  • Page 47 Axcera-430A FCC Type Acceptance Report Operational Description Low Frequency Linearity ..............5% Intermodulation Distortion ............-52 dB Amplitude Variation Over One Field ..........2% Regulation Of Output ..............3% Envelope Delay vs. Frequency.........Per FCC curves 2T Pulse ..................2% 12.5T Pulse.................5% Modulation Capability..............1% AM Noise ................-55 dB Harmonic Emission ..............

  • Page 48: System Overview

    Axcera-430A FCC Type Acceptance Report Operational Description 8.4. System Overview The 430B (1303854) is made up of the trays and assemblies listed in Table 8-1. Table 8-1. 430B Major Trays and Assemblies MAJOR ASSEMBLY TRAY/ASSEMBLY NAME DRAWING NUMBER DESIGNATOR AC distribution panel...

  • Page 49: Control And Status

    Axcera-430A FCC Type Acceptance Report Operational Description 8.5 Control and Status Control and status information for the transmitter is provided by the meter and LED indicators on the front panel of the VHF exciter. The switches and LED indicators are part of (A17) the transmitter control board that is mounted so that the switches and LEDs can be operated or viewed from the front panel of the VHF exciter.
  • Page 50 Axcera-430A FCC Type Acceptance Report Operational Description 8.5.1 VHF Exciter Tray Table 8-2. VHF Exciter Tray Meters METER FUNCTION This meter reads power in terms of a percentage of the calibrated output power level on the upper scale. The voltage level or frequency level is read on one of the bottom two scales.

  • Page 51: Exciter Tray

    Axcera-430A FCC Type Acceptance Report Operational Description Table 8-3. VHF Exciter Tray Switches SWITCH FUNCTION The momentary switch S1 applies a ground to K1, a latching relay on the transmitter control board. K1 will switch either to Operate or to Standby depending on which Transmitter S1 direction S1 is pushed.
  • Page 52 Axcera-430A FCC Type Acceptance Report Operational Description Table 8-5. VHF Exciter Tray Samples SAMPLE DESCRIPTION A sample of the visual IF that is taken from f(IF) the sample jack on the IF carrier oven oscillator board. A sample of the intercarrier signal that is...

  • Page 53: Vhf High Band Amplifier Tray

    Axcera-430A FCC Type Acceptance Report Operational Description 8.5.2 VHF High High Band Amplifier Tray Table 8-6. VHF High Band Amplifier Tray Switches SWITCH FUNCTION Switches 220 VAC through a 15-amp circuit breaker-type On/Off Circuit Breaker CB1 protection device. The switch lights if AC is present. The AC is applied to the switching power supply in the tray.

  • Page 54: Input And Remote Connections

    Axcera-430A FCC Type Acceptance Report Operational Description Table 8-7. VHF High-Band Amplifier Tray Fault Indicators INDICATOR DESCRIPTION Indicates that the level of drive is too high. The protection circuit will limit the drive Overdrive (DS1) level to the set threshold. The fault is generated on the overdrive protection board.
  • Page 55 Axcera-430A FCC Type Acceptance Report Operational Description The remote connections listed in Table 8-10 are made to (A12) the A/V input and remote interface assembly. The remote connections are made to jacks J9 and J10 on the assembly. Refer to the interconnect drawing (1076203) for the proper pin remote connections.
  • Page 56 Axcera-430A FCC Type Acceptance Report Operational Description REMOTE JACK/PIN FUNCTION INTERFACE TYPE NUMBER Auto/Manual Indicator J9-19 Return Transmitter Manual 50 mA max current sink J9-20 Indicator VSWR Cutback Indicator 50 mA max current sink J9-23 VSWR Cutback Indicator J9-24 Return...

  • Page 57: Ac Input

    Axcera-430A FCC Type Acceptance Report Operational Description Table 8-11. VHF Amplifier Tray Remote Interface Connections with the A/V Input and Remote Interface Assembly REMOTE JACK/PIN FUNCTION INTERFACE TYPE NUMBER Forward Output Power (A6) 1V full scale at 1kΩ source J10-1...

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