PW2VTX2KW2 KW VHF TV TRANSMITTER

V T X 2 K W - A INSTRUCTION MANUAL SN: PINEAPPLE TECHNOLOGY, INC. DRAFT PINEAPPLE TECHNOLOGY, INC. VTX2KW-A Operating and Service Manual TABLE OF CONTENTS Page 1 Section I — SAFETY NOTICES ........................................................................2 **READ THIS SECTION BEFORE INSTALLATION** Section II — TRANSMITTER SPECIFICATIONS ..............................................3 Section III — TRANSMITTER INSTALLATION .................................................5 Section IV — TRANSMITTER TURN-ON PROCEDURE ....................................6 Section V — THEORY OF OPERATIONS A. Introduction ............................................................................................................................7 B. ACDIS2 ..7 C. AC2008 2KW Power Module ................................................................................................8 D. PAS10 and ADP500 Performance Monitor ............................................................................8 E. Remote Monitor and Control W/ABS ....................................................................................9 F. Modulator/Driver ..................................................................................................................10 G. VS500 4-Way Splitter ...........................................................................................................10 H. MFA1KW PA Mainframe Assembly ....................................................................................10 I. V600LDV2 Integrated Amplifier Assembly .........................................................................11 J. VC2KW-4 Power Combiner with Coupler ..........................................................................11 K. BPV2KW Band Pass FIlter ..................................................................................................11 Section VI — SCHEMATIC AND PARTS LISTS A. VTX2KW-A .........................................................................................................................12 B. ACDIS2 14 C. MFA1KW .............................................................................................................................17 1. 1A0035 Status Board ........................................................................................................19 D. V600LDV2 ...........................................................................................................................21 1. VH200LD .........................................................................................................................23 2. 1A0025 Power Distribution and Monitor .........................................................................26 E. VS500 4-Way Splitter ...........................................................................................................28 F. VC2KW 4-Way Combiner ...................................................................................................29 G. PAS10 and ADP500 PA Monitor ..........................................................................................30 H. 1A5001/2 Isolator Assembly ................................................................................................40 Section VII — RECOMMENDED ROUTINE MAINTENANCE ..........................42 Section VIII — ADJUSTMENTS AND TUNING ..............................................43 Section IX — PROBLEM SOLVING / TROUBLE SHOOTING ..........................45 Section X — WARRANTY ..............................................................................47 Section XI — EXTENDED WARRANTY ..........................................................48 PINEAPPLE TECHNOLOGY, INC. VTX2KW-A Operating and Service Manual I — SAFETY NOTICES I — SAFETY NOTICES **READ THIS SECTION BEFORE INSTALLATION** SEVERE ELECTRICAL SHOCK OR BURNS MAY OCCUR IF THIS EQUIPMENT IS USED IMPROPERLY. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NEVER WORK ON THIS EQUIPMENT ALONE. ALWAYS HAVE ANOTHER PERSON PRESENT WHILE WORKING ON ELECTRICAL CIRCUITS OR MOVING EQUIPMENT. COMMUNICATIONS TO EMERGENCY SERVICES SHOULD BE AVAILABLE AT ALL TIMES. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ BEFORE CONNECTING THIS EQUIPMENT TO ANY AC ELECTRICAL SOURCE READ THE SEC- TION ON INSTALLATION. ALL ELECTRICAL WIRING FOR THIS EQUIPMENT MUST BE PER- FORMED BY QUALIFIED ELECTRICIANS. ALL WIRING MUST BE COMPLIANT WITH LOCAL ELECTRICAL CODES. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ POWER AMPLIFIERS AND SUPPLIES ARE HEAVY. TO INSTALL THIS EQUIPMENT IN RACKS, USE TWO (2) PERSONS TO AVOID POSSIBLE INJURIES. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NEVER OPEN THE CABINET ENCLOSURE OR UNPLUG CABLES OR WIRES WHILE THIS EQUIPMENT IS OPERATING. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ALL SERVICE WORK MUST BE PERFORMED BY QUALIFIED TECHNICIANS ONLY. IF ONE IS NOT AVAILABLE LOCALLY, CONTACT PINEAPPLE TECHNOLOGY, INC. FOR A LIST IN YOUR AREA. Page 2 PINEAPPLE TECHNOLOGY, INC. VTX2KW-A Operating and Service Manual II — VTX2KW-A SPECIFICATIONS II — VTX2KWA SPECIFICATIONS OPERATING Power Output ......................................................2 KW Peak Sync Aural Power .........................................................200 Watts RF Output Impedance ..........................................50 ohms Operating Frequency Range ................................Channel 7 thru 13 NTSC Frequency Stability ..............................................1 PPM or better Harmonic and Spurious .......................................-60 dB or better ref to P-sync Power Consumption ............................................8 KW Maximum AC Line Voltage ..................................................208-240 V AC SINGLE PHASE VIDEO PERFORMANCE Visual Frequency Response .................................+/- 1 dB across the TV Channel -1.25 MHz to 4.75 MHz relative to visual carrier. Differential Gain ..................................................<7 % Differential Pha…

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December 23, 2004 FCC Office of Equipment Authorization To Whom It May Concern: ATTESTATION STATEMENT I hereby certify the measurements and test results were made and recorded in accordance with accepted engineering practices and do constitute an accurate representation of the product performance of the documented VTX2KW TV transmitter serial number 001. Signed, Gregory L. Best President, Greg Best Consulting, Inc. GREG BEST CONSULTING, INC. 5541 Vantage Vista Drive Colorado Springs, CO 80919 719-592-9781

BLOCK DIAGRAM VTX2KW TV TRANSMITTER VHF Exciter RF Combiner Bandpass Filter & Coupler Control & Power Metering Circuits Solid State Power Supply ( X4 ) Solid State Driver 2000 watt Visual 200 watt Aural RF Splitter Solid State Power A mplifiers AC Voltage Distribution Cabinet fan Assembly Video Audio

1 December 23, 2004 FEDERAL COMMUNICATIONS COMMISSION OFFICE OF EQUIPMENT TECHNOLOGY 445 12 ST. SW WASHINGTON, DC 20554 PINEAPPLE TECHNOLOGY INCORPORATED APPLICATION FOR VTX2KW TV TRANSMITTER TYPE CERTIFICATION Pineapple Technology Inc. (PTI) has designed, built, tested and intends to market a Television transmitter with model VTX3KW. Type certification is sought over the range of 500 W to 2.0 kW visual output power. This transmitter is a common amplification system with 10% aural power. The attached documentation of the user manual is a preliminary version of the documentation. A final documentation package will be submitted upon its completion from the publisher. The submission of the following exhibits is expected to demonstrate compliance with applicable Part 2, Part 73, and Part 74 rules and regulations. Sincerely, Greg Best President Greg Best Consulting, Inc. 9223 N. Manning Ave. Kansas City, MO 64157 816-792-2913

VTX2KW EXTERNAL CONSTRUCTION PHOTOGRAPHS VTX2KW FRONT TOP VIEW VTX2KW MIDDLE FRONT VIEW VTX2KW BOTTOM FRONT VIEW VTX2KW REAR VTX2KW LEFT SIDE VTX2KW RIGHT SIDE

VTX2KW INTERNAL CONSTRUCTION PHOTOGRAPHS VTX2KW TOP BACK VIEW VTX2KW LOWER BACK VIEW

VTX2KW THEORY OF OPERATION Introduction The VTX2KW Television Transmitter is a TV transmitter capable of providing 2 kW of visual RF power and 200 watts of aural power at the output of the transmitter. The transmitter is comprised of a precision modulator and upconverter, 4 way power splitter, 4 solid state common amplification RF power amplifiers operating in parallel, a 4 way power combiner, 4 DC power supplies, RF filter to eliminate spurious products and harmonics, cooling system, AC voltage distribution system, control and monitoring system for the human interface, and all necessary hardware to assemble the transmitter into the transmission facility. The transmitter system is housed in one 19 inch rack. System Operation RF SIGNAL GENERATION Video and audio are fed to the high quality TV modulator/upconverter where the high quality TV visual and aural signals are produced. The upconverter converts the modulated TV signal to its desired channel and eliminates the image frequency product. The signal is fed to a 4 way splitter that distributes an in-phase and equal amplitude signal to each of the 4 power amplifiers. Each power amplifiers accepts the RF signal and is capable of producing a 600 watt peak of sync NTSC TV waveform. The 4 way combiner accepts all 4 RF signals and combines the signals to one common output connector. The output signal from the combiner feeds a directional coupler. The output signal from the directional coupler passes through a bandpass filter that reduces all out of channel intermodulation products and harmonics to an acceptable level consistent with FCC rules. POWER SUPPLY SYSTEM The incoming main three phase AC power passes through a circuit breaker control panel that distributes the power to various assemblies throughout the transmitter. From the circuit breaker panel, separate single phase AC lines are fed to the modulator/upconverter, driver, control and monitoring system, and air cooling system, as well as auxiliary outlets for the transmitter. The VTX2KW utilizes 4 power supplies. Input AC voltage is fed to each of the DC power supplies via one power supply frame designed to house all of the power supplies. Each one of the DC power supplies converts the AC line voltage to approximately 31 volts DC. Its voltage is held constant independent of modulated RF waveform type and overall load. All of the DC outputs from the power supplies are connected in parallel. The power supplies share the load current required by the amplifier group. The entire load current required by the power amplifiers can be provided by 4 power supplies. The parallel connection and smart circuitry of the power supplies allows all power supplies to share the load. This combination will also allow one power supply to fail and the transmitter can still operate at full power under normal picture content. SOLID STATE POWER AMPLIFIER Each solid state power amplifier (PA) consists of 2 stages of amplification using LDMOS technology. The power gain of each power amplifier is approximately 35 dB. Within each power amplifier, the first stage serves as a low distortion linear amplifier that increases the power of the combined visual and aural signal roughly 13 dB. This output signal is routed to 4 parallel configured final amplifiers. The driver and final amplifier transistors receive DC voltage from the power supply frame elsewhere in the rack via connections on the rear of the amplifier. VSWR and over-temperature protection is provided in order that the transistors are not damaged from high reflected power operating conditions. The heatsink temperature is monitored and whenever it exceeds a pre- determined temperature, a front panel LED indicator is illuminated and the power amplifier module shuts off. Integral fans provide direct cooling air to the amplifier heatsinks to ensure that the heat is removed efficiently from the PA modules. When the temperature decreases back below the threshold, the power amplifier automatically re-enables to the “On” state. POWER SUPPLY The power supply architecture is a very efficient DC switching power supply unit. Each power supply is hot-pluggable and is inserted and removed from the front of the transmitter. The unit accepts voltage from a 50 or 60 Hz source. The output voltage is tightly regulated in order to eliminate any amplitude modulation on the output RF signal. Current limit protection is built in to the power supply should it accidentally encounter a very high current demand. Each power supply is cooled by internal fans. RF SPLITTER AND COMBINER The RF splitter is an assembly that separates the RF signal into equal amplitude and in-phase signals for each port. The RF combiner reverses the process and combines all amplifier outputs together. Each group of input cable, power amplifier, isolator and output cables is matched for the same transmission phase angle and amplitude to be present at the RF combiner input RF FILTER The RF filter is a multiple section bandpass filter designed to pass signals in the designated channel and reject all others. Connections for the RF input and output are made through 50 ohm connectors. The filter is tuned to a specific TV channel. CONTROL AND MONITORING SYSTEM The control and monitoring system of the transmitter provides the following functions: Forward Visual, forward Aural, and combined reflected power output level monitoring Status lights for all power amplifier modules Metering for all power amplifier currents RF sample port for monitoring the forward signal using separate test equipment Power Amplifier enable/disable switch AIR COOLING SYSTEM An exhaust fan on the top of the cabinet provides cooling for the system. Cool air is drawn through the front of the transmitter by highly reliable fans in the individual amplifier modules and exhausted at the back of the amplifiers. The exhaust fan pulls the warm air from the amplifiers up to the top of the cabinet.

January 3, 2005 Federal Communications Commission OET Equipment Authorization Branch Washington DC Dear Sir, This letter is to inform you that the schematics for the VTX2KW TV transmitter are contained in the user manual which has already been uploaded to the OET website. Sincerely, Greg Best President Greg Best Consulting, Inc. 9223 N. Manning Ave. Kansas City, MO 64157 816-792-2913

TEST REPORT PINEAPPLE TECHNOLOGY INC. VTX2KW TV TRANSMITTER TECHNICAL REPORT INTRODUCTION The following information is provided to support the technical performance of the Pineapple Technology VTX2KW TV Transmitter. The information is supplied for broadcast TV service according to applicable portions of FCC rules contained in Part 2, Part 73, and 74. 1. Power Output Measurements as indicated by FCC Rule Part 2.1046. 2. Frequency Measurements as identified by FCC Rule Part 2.1055. 3. Visual Frequency response measurements of the transmitter to be within the window specified by FCC Rule Part 74.750. 4. Occupied BW of aural signal specified by FCC Rule Part 2.1079. 5. Aural frequency response as identified by FCC Rule Part 73.687 6. Measurement of conducted harmonics and spurs +/- 3 MHz outside of channel as specified by FCC Rule Part 74.750 and Part 2 Rule 2.1051. 7. Measurement of cabinet radiation of spurs and harmonics as specified in FCC Rule 2.1053 and 2.1057. 8. Measurements of voltage and current to final amp stage as outlined in FCC Rule 2.1033. Measurements were conducted at transmitter visual power output levels of 2000 watts peak of sync and 500 watts peak of sync and constitute the range of power for which type certification is sought. The corresponding aural power levels are 200 watts and 50 watts. Measurements were taken on a unit with visual carrier frequency of 175.25 MHz and an aural carrier frequency of 179.75 MHz. The test equipment used for the measurements on the next few pages is listed at the back of this exhibit. All test equipment was calibrated prior to the use of the equipment by the supplier of the test equipment. RF POWER OUTPUT The equipment was configured as below shown in Figure 1. The loss through the RF output cable, directional coupler and attenuator was calibrated at the frequency of 175 MHz. The TSG-90 video generator was configured to produce a signal with 0 IRE video and sync. The audio generator and aural carrier were not energized. The visual portion of the transmitter was energized and the power was increased to the desired output power. The power was read on the HP-435 Power Meter and a reference level was established on the HP8590B Spectrum Analyzer. The TV demodulator and VM-700 were used to verify that sync compression was not causing distortion of the measurement. The aural carrier was energized and its output level was then raised to meet the precise 10 dB Visual/aural power ratio as observed on the spectrum analyzer. Pictures were also taken of demodulated video with 2 lines of a modulated stairstep (or reference white level) , and 2 fields of video to verify no signal distortions were present over the 500 watt to 2.0 kwatt power level range where certification is being sought. POWER OUTPUT HP 435 Power Meter reading HP 435 Power Meter reading at high power= 1200 watts at low power= 300 watts Peak of sync power = 1.68 times Peak of sync power = 1.68 times average power reading with a black average power reading with a black picture and “0” setup picture and “0” setup Peak of sync power = 1.20 x 1.68 Peak of sync power = 0.30 x 1.68 = 2.02 kwatts = 504 watts Tektronix TSG-90 Video Generator Tektronix 1410 Video Generator HP 200CD Audio Oscillator Tektronix VM700A HP 54601 Oscilloscope VTX2KW HP Power Meter MSI TV Demodulator Agilent 8590B Spectrum A nal y zer HP 8901B Modulation A nal y zer TEST EQUIPMENT CONFIGURATION 40 dB coupler A udio Video Video Quadrature Video Dashed line indicates onl y one instrument connected at a time. Bird + Narda Attenuator TWO HORIZONTAL LINES AND TWO FIELDS SHOWING CORRECT MODULATION DEPTH FOR REFERENCE WHITE AND SYNC LEVELS AT 2.0 KW Power Output = 2.0 kwatts Power Output = 2.0 kwatts

TWO HORIZONTAL LINES AND TWO FIELDS SHOWING CORRECT MODULATION DEPTH FOR REFERENCE WHITE AND SYNC LEVELS AT 500 WATTS Power Output = 500 watts Power Output = 500 watts As can be seen from the above photographs there is negligible distortion of the waveforms. FREQUENCY STABILITY MEASUREMENTS Frequency stability versus temperature and line voltage was measured in a controlled environment. For these tests the exciter RF output was fed to a frequency counter that has better than a 1ppm accuracy. The test equipment configuration is shown below. Frequency Stability versus line voltage variation Frequency Stability versus temperature The Variac was adjusted for nominal voltage and the frequency was recorded. Then the variac was adjusted to 85% and 115% of the nominal voltage and the frequency was recorded at each voltage level. The results are tabulated below. LINE VOLTAGE (Volts) Visual Frequency (MHz) Aural Frequency (MHz) 100 (85%) 175.250290 179.750393 121 (nominal) 175.250281 179.750380 140 (115%) 175.250277 179.750376 For the temperature stability measurements the exciter was placed inside a Tenney temperature chamber equipped with a MicroTenn II temperature controller. The exciter frequency was measured on the frequency counter. Measurements were first recorded at room temperature. The temperature in the chamber was changed to each of the points identified in the table below. The chamber followed a prescribed rate of change to reach each temperature and was then allowed to stabilize at the desired temperature for 10-15 minutes at which time frequency measurements were made. The temperature was cycled hot to 50°C and then gradually decreased until the entire range was covered. Temperature °C Time Visual Frequency (MHz) Aural Frequency (MHz) 25 1:30 175.250226 179.750232 50 2:50 175.250224 179.750230 40 3:10 175.250226 179.750231 30 3:20 175.250226 179.750232 20 3:30 175.250225 179.750233 10 3:45 175.250224 179.750230 0 4:00 175.250224 179.750229 -10 4:10 175.250224 179.750229 -20 4:20 175.250225 179.750231 -30 4:30 175.250227 179.750233 The recorded data indicates that the frequency stability requirements of FCC Rule 2.1055 were met. Exciter Frequency Counter Variac AC Input AC OutputRF Output Exciter Frequency Counter Temperature Chamber RF Output

VISUAL TRANSMITTER FREQUENCY RESPONSE MEASUREMENTS The test equipment configuration of Figure 1 was used with the 1410 video generator supplying the video input waveform. For this test, the aural carrier was left energized. A variable frequency sine wave of 90 IRE Peak-to-Peak amplitude from 200 kHz to 4.5 MHz with pedestal set at 52.5 IRE input video waveform was used. The modulation output was increased until the maximum excursion reached reference white and 10 IRE as shown in the photo below. The frequency of the variable sine wave was varied between 200 kHz to 4.5 MHz in 500 kHz steps. The RF sideband output level was measured for the sidebands below and above the visual carrier. The frequency response was plotted. The plots were scanned and are shown beginning on the next page. Spectrum plots for both 2.0 kW and 500 Watt power output conditions are displayed to confirm that the radiated envelope meets the requirements as outline in Part 74 Rule 750. FREQUENCY RESPONSE INPUT WAVEFORM The sweep amplitude of 90 IRE establishes a spectrum component at -14 dB reference to peak of sync output power. The frequency response measurements are tabulated below for upper and lower sideband values at power levels of 2 kW and 500 Watts and plotted on the next page to demonstrate compliance with the frequency response Rule 74.750. The tabulated values are compared to the -14 dB reference in the tables but plotted on an absolute level. Power Level Pout = 2 kW Pout =500 W Frequency LSB USB LSB USB 200 kHz -15 dB -15 dB -15 dB -15 dB 500 kHz -16 dB -16 dB -15 dB -15 dB 1.0 MHz -40 dB -15.5 dB -18 dB -14.5 dB 1.5 MHz -48 dB -15 dB -45 dB -14.5 dB 2.0 MHz -51 dB -15 dB -45 dB -14.5 dB 2.5 MHz -48 dB -15 dB -46 dB -14.5 dB 3.0 MHz -49 dB -15.5 dB -46 dB -14.3 dB 3.5 MHz -57 dB -16 dB -56 dB -14.5 dB 4.0 MHz -63 dB -16 dB -64 dB -14.3 dB 4.2 MHz -68 dB -16 dB -69 dB -14.5 dB 4.4 MHz -68 dB -25 dB -70 dB -22 dB PLOT OF SPECTRUM AT POWER OUTPUT =2.0 kwatts PLOT OF SPECTRUM AT POWER OUTPUT =500 watts

OCCUPIED BANDWIDTH MEASUREMENTS The test equipment was configured as in Figure 1. The aural carrier was energized and increased in power until the desired Visual to Aural power ratio of 10 dB was met. The visual input waveform used was a “0” IRE video input level from the TSG-90 and the aural input signal was a 15 kHz sine wave taken from the HP 200CD audio generator. The aural deviation was increased until the desired level (85% of 25 kHz = 21.25 kHz) was indicated on the HP8901B modulation analyzer and on the calibrated deviation output of the MSI 320 TV demodulator. The output spectrum was observed on the HP 8590B spectrum analyzer noting the requirements as identified in FCC Rule Part 2.1079. As can be observed, the output spectrum meets these requirements. OCCUPIED BANDWIDTH—POWER OUTPUT = 2.0 kWatts (Scan width = 200 kHz) OCCUPIED BANDWIDTH—POWER OUTPUT = 500 Watts (Scan width = 200 kHz)

AURAL FREQUENCY RESPONSE The equipment configuration of Figure 1 was used. The visual and aural carriers were energized and the aural carrier was modulated by the HP200CD audio frequency generator. A reference level was set at 200 Hz and the audio generator level was adjusted to achieve 25 kHz deviation at each modulating frequency using the calibrated audio output (in mvolt/kHz) from the MSI 320 TV demodulator. An oscilloscope was used to compare the input voltage with the output demodulated voltage from the MSI 320 TV Demod to determine the response level. The following table of audio response was obtained by dividing the output audio level by the input level. This table is plotted on the graph shown below. The input termination to the VTX2KW was fixed at 600 ohms. FREQUENCY RESPONCE FREQUENCY (Hz)AMPLITUDE (dB) 50 0.0 100 0.0 200 Reference 500 0.2 1000 0.9 2000 2.6 5000 8.0 10000 13.3 13000 14.2 15000 14.6 AURAL FREQUENCY RESPONSE GRAPH WITH LIMITS The green line is the plotted results.

CONDUCTED SPURIOUS AND HARMONICS The following photographs indicate the spurious performance (> +/- 3 MHz) from the designated TV channel. As can be seen from the photos (one taken at 2.0 kW and the other taken at 500 W), the spurious levels are below 60 dB relative to the peak of sync of the visual carrier. The diamond in the top center of the screen indicates the true peak of sync value when the vertical interval portion of the picture is present. These photos indicate the desired 10 dB visual to aural power ratio. POWER OUTPUT = 2.0 kWatts POWER OUTPUT = 500 Watts CONDUCTED HARMONIC OUTPUTS The following data indicates the harmonic performance of the VTX2KW. Only the 2 nd harmonics were visible. The following table displays the actual value of the harmonic that takes into account the coupling factor of the directional coupler and loss of the cable used for the measurement. There was no value recorded when the instrument measured value was <-75dB relative to the visual peak of sync value as this was below the noise floor of the spectrum analyzer with the bandwidth used. Photographs of the spectrum containing the second harmonic are shown below. The pictures indicate that the harmonic levels are well below 60 dB compared to the diamond at the top of the screen which represents visual sync peak power. HARMONIC LEVELS VERSUS FREQUENCY AT 2.0 KW FREQUENCY OF HARMONIC (MHz) AMPLITUDE (Relative to visual Peak Sync at fundamental frequency (dB)) 350.5 (2 nd harmonic) -70 dB 525.75 (3 rd harmonic) <-75 dB 701 (4 th harmonic) <-75 dB 876.25 (5 th harmonic) <-75 dB 1051.5 (6 th harmonic) <-75 dB 1226.75 (7 th harmonic) <-75 dB 1402 (8 th harmonic) <-75 dB 1577.25 (9 th harmonic) <-75 dB 1752.5 (10 th harmonic) <-75 dB HARMONIC LEVELS VERSUS FREQUENCY AT 500 Watts FREQUENCY OF HARMONIC (MHz) AMPLITUDE (Relative to visual Peak Sync at fundamental frequency (dB)) 350.5 (2 nd harmonic) -70 dB 525.75 (3 rd harmonic) <-75 dB 701 (4 th harmonic) <-75 dB 876.25 (5 th harmonic) <-75 dB 1051.5 (6 th harmonic) <-75 dB 1226.75 (7 th harmonic) <-75 dB 1402 (8 th harmonic) <-75 dB 1577.25 (9 th harmonic) <-75 dB 1752.5 (10 th harmonic) <-75 dB POWER OUTPUT = 2.0 kWatts Photo of 2 nd Harmonic spectrum POWER OUTPUT = 500 Watts Photo of 2 nd Harmonic spectrum Both photographs are centered at the 2 nd Harmonic because only those harmonics were possibly visible. The fundamental frequency visual peak of sync reference value is located at the top of the screen on these photographs. The values indicate a maximum harmonic level of -70 dB when corrected for coupling and cable loss.

CABINET RADIATION The transmitter and test equipment were configured as shown below including the angles of measurement with respect to the transmitter cabinet. The photo on the subsequent page also shows one view of the physical set-up of the test equipment and equipment under test. The transmitter was operated at 2.0 kW peak sync power with a 10 dB visual/aural ratio with the video input signal being a Modulated Stairstep signal. The free space path loss and antenna gain characteristics were obtained at the fundamental frequency and at each of the harmonics of the visual carrier frequency in order to accurately assess the level of the signal radiated from the cabinet. Radiation from the cabinet was measured at a distance of 30 feet in 4 different physical rotation angles: 0, 90, 180, and 270 degrees (0 degrees being the front of the cabinet). All spectral components above -80 dB referenced to peak sync power radiated from the cabinet were recorded. The values are tabulated in the table on the next page following the photos. For frequencies below 1.05 GHz, an Amplifier Research log periodic antenna was used. For frequencies above 1.05 GHz, a set of dipoles for the measurement frequencies was used. TEST EQUIPMENT CONFIGURATION Tektronix 1410 Video Generator VTX2KW XMTR HP 8590B Spectrum Analyzer Bird + Narda Attenuator & HP Power Meter Log Periodic or Dipole Antenna Cabinet 0° Front 90° 180° 270° PHYSICAL CABINET RADIATION TEST CONFIGURATION This photograph shows the actual laboratory environment in which the cabinet radiation tests were conducted. The log periodic antenna, cable and spectrum analyzer is shown in the foreground and the VTX2KW is shown in the background. The transmitter was rotated 90 degrees for each of the measurement orientations. As indicated in the spreadsheet data on the following page, the worst case measurement was 62 dB at the second harmonic. (This photo on the next page shows this particular measurement). The measurement tables for the all views of the transmitter at each frequency are shown below. The results indicate that all radiated harmonics meet the FCC requirement of 60 dB as outlined in FCC rule 2.1053 and 2.1057. CABINET RADIATION DATA CABINET RADIATION SPREADSHEET VTX-2KW Front View 2 kW = 63 dBm Corrected level must be less than 3 dBm Distance is 30 feet Harmonic Frequency Measured Antenna Path Corrected Required Comparison to transmit level MHz Level Gain Loss Level Level dB Xmit freq. 175.25 -356.536.6-4.9 3 dBm 67.9 2nd 350.5 -356.542.61.1 3 dBm 61.9 3rd 525.75 -456.546.1-5.4 3 dBm 68.4 4th 701 -656.548.6-22.9 3 dBm 85.9 5th 876.25 -606.550.6-15.9 3 dBm 78.9 6th 1051.5 -656.552.2-19.3 3 dBm 82.3 7th 1226.75 -80053.5-26.5 3 dBm 89.5 8th 1402 -80054.7-25.3 3 dBm 88.3 9th 1577.25 -80055.7-24.3 3 dBm 87.3 10th 1752.5 -75056.6-18.4 3 dBm 81.4 CABINET RADIATION SPREADSHEET VTX-2KW Left Side View 2 kW = 63 dBm Corrected level must be less than 3 dBm Distance is 30 feet Harmonic Frequency Measured Antenna Path Corrected Required Comparison to transmit level MHz Level Gain Loss Level Level dB Xmit freq. 175.25 -306.536.60.1 3 dBm 62.9 2nd 350.5 -386.542.6-1.…

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