BZ5TTS250MV250 Watt VHF Translator

BZ5TTS250MV Application for FCC Certification Modulator Input 250 Watt VHF Translator AUDIO FREQUENCY RESPONSE Tabulated below, are the frequency response measurements for various percentages of modulation in accordance with Part 73.1570(b)(3). The tabulated data, below, is in graphed form on the following pages. AUDIO FREQUENCY RESPONSE REFERENCE 50Hz AT 0dB INTO 600 OHMS MODULATION FREQUENCY(Hz) 50% 100% 50 -1.53 -1.50 100 -1.55 -1.52 400 -1.62 -1.60 1000 -0.73 -0.70 5000 +6.98 +6.90 10000 +12.44 +12.35 15000 +15.76 +15.61 Tabulated below, are the harmonic distortion measurements. AUDIO HARMONIC DISTORTION LEVEL (%) MODULATION FREQUENCY(Hz) 50% 100% 50 0.153 0.156 100 0.155 0.152 400 0.143 0.140 1000 0.122 0.110 5000 0.155 0.149 10000 0.254 0.253 15000 0.342 0.337 The output noise level (FM measured as prescribed in the band of 50 to 15000Hz) was 71dB below the level representing +25kHz frequency swing. The system noise output (AM) in the same band was 65dB below the level representing 100% amplitude modulation.

BZ5TTS250MV Application for FCC Certification Modulator Input 250 Watt VHF Translator POWER MEASUREMENTS Power requirements for the 250 Watt VHF Translator were determined as follows: 1. The translator’s visual power meter measures the peak visual power by reading the average levels of a detected sample of the output. The meter is calibrated by multiplying the above visual power reading by 168%. The visual metering circuitry has a negligible response to the aural power due to the large (>10MHz) detector bandwidth. When the detector bandwidth is this large, the detector does not peak detect the intercarrier beat product. 2. The aural power is measured by reading the peak level of the detected 4.5MHz intercarrier product. The level of this product has a direct correspondence to the aural power and is independent of the visual power as long as the peak visual power exceeds the aural power. SUPPLY CURRENT SUPPLY CURRENT MEASURED MEASURED TO O/P DEVICES TO O/P DEVICES VISUAL PWR AURAL PWR VISUAL ONLY VISUAL & AURAL NOTE 1 NOTE 2 NOTE 3 NOTE 3 150 Watts 25 Watts 8.45 Amps 8.95 Amps Note 1: Measured on the Bird Model 43 Wattmeter with the visual carrier modulated by the standard synchronizing signal at 75% of peak amplitude and the aural carrier disabled. Note 2: Measured on the Bird Model 43 Wattmeter with the visual carrier disabled. Note 3: The voltage across the output devices on all models is +50 volts. The output devices are operated Class ‘AB’.

BZ5TTS250MV Application for FCC Certification Modulator Input 250 Watt VHF Translator ATTENUATION VS FREQUENCY CHARACTERISTICS MODULATING FREQUENCY(MHz) UPPER FCC LIMIT LOWER FCC LIMIT REF = VISUAL CARRIER(MHz) SIDEBAND (dB) SIDEBAND (dB) +0.2 0 Reference - - -0.5 -0.5 - - +0.5 -0.1 - - +1.25 -0.3 -25 >-20 +2.0 -0.4 -28 >-20 +2.5 -0.4 -39 >-20 +3.0 -0.3 -46 >-20 +3.5 -0.3 -54 >-20 +3.58 -0.2 -56 >-42 +4.1 -0.3 -64 >-20 +4.18 -0.2 -70 >-20 +4.75 -26.3 >-20 -72 >-20 +5.0 -26.7 >-20 -73 >-20 +6.0 -62 >-20 -76 >-20 +7.0 -70 >-20 -77 >-20 +8.0 -88 >-20 -82 >-20 +9.0 -97 >-20 -86 >-20 +10.0 -104 >-20 -87 >-20