ONDRF5615Base Unit

ETC Report No.:ET88R-07-021Sheet 11 of 39 Sheets FCC ID.:ONDRF5615 4. MODULATION CHARACTERISTICS 4.1Provisions Applicable According to §2.1047 (a), for Voice Modulated Communication Equipment, the frequency response of the audio modulating circuit over a range of 100 to 5000 Hz shall be measured. 4.2Measurement Method A) Frequency response of audio circuits 1. Position the EUT as shown in figure 2. 2. Vary the modulating frequency from 100 Hz to 5000 Hz with varying the input voltage from 0V to maximum permitted input voltage, and observe the change in output. B) Modulation Limit 1. Position the EUT as shown in figure 2, adjust the audio input frequency to 100 Hz and the input level from 0V to maximum permitted input voltage with recording each carrier frequency deviation responding to respective input level. 2. Repeat step 1 with changing the input frequency for 200, 500, 1000, 3000, and 5000 Hz in sequence. C) Frequency response of all circuits 1. Position the EUT as shown in figure 2. 2. Vary the modulating frequency from 100 Hz to 15000 Hz with constant input voltage (derived from 5.4(a) of this test report), and observe the change in output. ETC Report No.:ET88R-07-021Sheet 12 of 39 Sheets FCC ID.:ONDRF5615 Figure 2 : Modulation characteristic measurement configuration Modulation Analyzer Audio Generator EUT 4.3Measurement Instrument EquipmentManufacturerModel No.Next Cal. Date Modulation AnalyzerHewlett-Packard8901ADec. 03, 1999 Multifunction SynthesizerHewlett-Packard8904ADec. 02, 1999 OscillscopeLecroy9350ADec. 01, 1999 4.4Measurement Result A). Frequency response 1) Headset Uint 0.01 0.1 1 10 5 1015202530354045505560 Input Level (mV) Output Level (V) 100 Hz200 Hz500 Hz1 kHz3 kHz5 kHz10 kHz ETC Report No.:ET88R-07-021Sheet 13 of 39 Sheets FCC ID.:ONDRF5615 2) Base Uint 0.01 0.1 1 10 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.911.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.922.1 2.2 2.3 2.4 2.5 Input Level (V) Output Level(V) 100 Hz200 Hz500 Hz1 kHz3 kHz5 kHz10 kHz B). Modulation Limit 1) Headset Uint 2 2.5 3 3.5 4 4.5 5 5.5 5 1015202530354045505560 Input Level (Vp-p) kHz 100 Hz200 Hz500 Hz1 kHz3 kHz5 kHz ETC Report No.:ET88R-07-021Sheet 14 of 39 Sheets FCC ID.:ONDRF5615 2) Base Uint 0 5 10 15 20 25 0.511.522.533.544.55 Input Level (Vp-p) kHz 100 Hz200 Hz500 Hz1 kHz3 Hz5 kHz C). Frequency response of all circuits -25 -20 -15 -10 -5 0 5 10 15 0.10.20.30.40.50.60.70.80.9123456789101112131415 Input Frequency (kHz) Frequency Response (dB ) Headset UnitBase Uint