GAFMURS2FM Transceiver

6. Instruction Manual 1) Safety Information Safety Information For MURS UNIT Your wireless handheld portable transceiver contains a low power(2watts) Transmitter. When the Push-to Talk (PTT) button is pushed it sends out radio frequency (RF) signals. This device is authorized to operate at a duty factor not to exceed 50%. In August 1996, the Federal Communications Commission (FCC) adopted RF exposure guidelines with safety levels for hand-held wireless devices. Important Note: To maintain compliance with the FCC's RF exposure guidelines, hold the transmitter and antenna at least 1 inch (2.5 centimeters) from your face and speak in a normal voice, with the antenna pointed up and away from the face. If you wear the handset on your body while using the headset accessory, use only the manufacturers supplied belt clip for this product and ensure that the antenna is at least 1 inch (2.5 centimeters) from your body when transmitting. Use only the supplied antenna. Unauthorized antennas, modifications, or attachments could damage the transmitter and may violate FCC regulations. THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. 2) General a) General This equipment, MURS is called 2 way portable handheld radios. The frequency range is 151.820°≠154.600MHz, VHF operating channels for International 2 way portable radios. b) Characteristic a. All active devices in this radio is composed of semiconductor and high density IC. b. To design this radio in compact and weight approximately 140g including Battery. c. CPU of this equipment is HD4074899TE from HITACHI. d. It’s power can operate by use of alkaline 4 cell (1.5V AA) battery. c) Composition This radio is composed of following. a. Transmitter (W/Antenna) b. Belt clip c. Ni-MH battery (option) 3) Specification a) General Specification a. Frequency Range: 151.820 °≠ 154.600MHz Weather Range: 161.650 ~ 163.275 (Receiver Only) b. Output Impedance: 50•ÿUnbalanced c. Modulation Type: 8K0F3E d. Communication Mode: Half duplex e. Channel Capacity: 5 channels(MURS), 10 channels(WX) f. Channel spacing: 12.5 KHz g. Power: 6.0V(alkaline) h. Battery Life: ALCA.2600mAh >40 hours (Tx5%, Rx5%, Stand-by 90%) i. Operating Temperature: -20°...°≠+60°... j. Dimension: 95.5(H) x 50(W) x 26(D) mm k. Weight: 140g(with Battery) b) Electrical Specification a. Transmitter 1. Output power: Max. 2.0W 2. Frequency Stability: °æ2.5 ppm (-20°...°≠+60°...) 3. Modulation Method: FM 4. Oscillation Method: PLL SYNTHESIZER 5. Max. Frequency Deviation : < °æ2.5 KHz (with tone) 6. Cooling Method: air-cooling Method 7. Spurious Emission: < 60dB 8. FM Hum/Noise: > -40dB(1kHz 60% modulation, w/CCITT) 9. Distortion: < 5% (1kHz 60% modulation) 10. Tx Audio Response: 6dB /OCT °æ3dB PRE-EMPHASIS (300Hz°≠2.5kHz) b. Receiver 1. Receive Method: Double Super Heterodyne 2. Receive Sensitivity: < 0.28uV(20dB SINAD w/CCITT) 3. Squelch Sensitivity: 6°≠8dB(12dB SINAD) 4. Bandwidth: > 3kHz(6dB ATT point) 5. Selectivity: < -60dB(12.5kHz) 6. Local Frequency Stability: °æ2.5ppm(-20°...°≠+60°...) 7. Spurious Response: > 40dB 8. Audio output: 200mW(Internal 8•ÿ load THD 10%) Ext.100mW 9. Distortion: < 5% (1kHz 60% Modulation) 10. RX Audio Response: 6dB/OCT °æ3dB DE-EMPHASIS (300Hz°≠2.5kHz) 11. S/N Ratio: < 40dB(1kHz 60% modulation w/CCITT) 12. IF: 1'st IF = 21.7MHz 2'nd IF = 450kHz 13. Local Frequency: 1st Local Frequency = fc - 21.7MHz 2nd Local Frequency = 21.25MHz 4) Operation a) Key Name a. Function and Controls 1. Antenna 2. Belt Clip 3. Detachable Belt Clip Button 4. Power Switch 5. Mode/Scan Button 6. Vox Button 7. Lock Button 8. Wx Button 9. Built-in Microphone 10. Battery Cover 11. Charge Terminal 12. External Mic/Speaker 13. LCD Display 14. Push-To-Talk (PTT) 15.Monitor Button 16. Call Button 17. Up Down Button 18. Built-in Speaker b) Icons on LCD a. RSSI (Receiving Signal Strength Indicator) Icon Indicates the receiving signal strength b. Monitor or Receiving Indicator Appears busy icon when the monitor button is long (about 0.5 sec.) used. Short press the Mon button and would be emitting the backlight lamp during 5 seconds. c. CTCSS Indicator Tone digits blink before when the select CTCSS tone CH. d. Auto Channel Scan Indicator SCAN icon appears in the auto scan mode or when the auto scan mode is activated. e. Key Lock Indicator Blinks in auto lock selection mode or when the key lock is activated. f. VOX Indicator VOX icon blinks in VOX selection mode or appears when VOX is activated. g. Battery Level Indicator Battery Level Meter indicates the remaining battery strength. h. Power Save Display P/SAVE icon blinks when the power save is activated. the rate at which the icon blinks varies with the power saving ratio. j. Rx Indicator Appears and RX icon when a signal is being received. l. Hi/Lo indicator When use Hi/Lo power wanted power state. m. Large Segment Display Indicates the channel number in use at the normal mode. When the Function Button is pressed. n. Small Segment Display Displays the CTCSS tone option at the normal mode. o. Roger beep Segment Display ROGER icon appears when the Roger beep activates. p. Tx Indicator Appears and TX icon when a signal is being transmission r. Appears and WX icon when a signal is being received (weather band) c) Key Function a. Power Volume - When power is on, briefly to press the unit on. A short confirming melody will play. b. Mode button - Press this button briefly to enter function edit mode in standby mode. c. Up/Dn button - In the function edit mode, press briefly to shift from the current option in each sub-menu to the next option in the same sub menu. d. Push-to-Talk (PTT) button - Press it firmly and speak into the Built-in Microphone to transmit. - Release it to revert to standby mode. When an incoming call is received, - Call…

Text truncated - open the document above for the full version.

6. Instruction Manual 1) Safety Information Safety Information For MURS UNIT Your wireless handheld portable transceiver contains a low power(2watts) Transmitter. When the Push-to Talk (PTT) button is pushed it sends out radio frequency (RF) signals. This device is authorized to operate at a duty factor not to exceed 50%. In August 1996, the Federal Communications Commission (FCC) adopted RF exposure guidelines with safety levels for hand-held wireless devices. Important Note: To maintain compliance with the FCC's RF exposure guidelines, hold the transmitter and antenna at least 1 inch (2.5 centimeters) from your face and speak in a normal voice, with the antenna pointed up and away from the face. If you wear the handset on your body while using the headset accessory, use only the manufacturers supplied belt clip for this product and ensure that the antenna is at least 1 inch (2.5 centimeters) from your body when transmitting. Use only the supplied antenna. Unauthorized antennas, modifications, or attachments could damage the transmitter and may violate FCC regulations. THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. 2) General a) General This equipment, MURS is called 2 way portable handheld radios. The frequency range is 151.820-154.600MHz, VHF operating channels for International 2 way portable radios. b) Characteristic a. All active devices in this radio is composed of semiconductor and high density IC. b. To design this radio in compact and weight approximately 140g including Battery. c. CPU of this equipment is HD4074899TE from HITACHI. d. It’s power can operate by use of alkaline 4 cell (1.5V AA) battery. c) Composition This radio is composed of following. a. Transmitter (W/Antenna) b. Belt clip c. Ni-MH battery (option) 3) Specification a) General Specification a. Frequency Range: 151.820 - 154.600MHz Weather Range: 161.650 ~ 163.275 (Receiver Only) b. Output Impedance: 50 ohms Unbalanced c. Modulation Type: 8K0F3E d. Communication Mode: Half duplex e. Channel Capacity: 5 channels(MURS), 10 channels(WX) f. Channel spacing: 12.5 KHz g. Power: 6.0V(alkaline) h. Battery Life: ALCA.2600mAh >40 hours (Tx5%, Rx5%, Stand-by 90%) i. Operating Temperature: -20 degrees C - +60 degrees C j. Dimension: 95.5(H) x 50(W) x 26(D) mm k. Weight: 140g(with Battery) b) Electrical Specification a. Transmitter 1. Output power: Max. 2.0W 2. Frequency Stability: +/- 2.5 ppm (-20 degrees C - +60 degrees C 3. Modulation Method: FM 4. Oscillation Method: PLL SYNTHESIZER 5. Max. Frequency Deviation : < +/- 2.5 KHz (with tone) 6. Cooling Method: air-cooling Method 7. Spurious Emission: < 60dB 8. FM Hum/Noise: > -40dB(1kHz 60% modulation, w/CCITT) 9. Distortion: < 5% (1kHz 60% modulation) 10. Tx Audio Response: 6dB/OCT +/-3dB PRE-EMPHASIS (300Hz +/-2.5kHz b. Receiver 1. Receive Method: Double Super Heterodyne 2. Receive Sensitivity: < 0.28uV(20dB SINAD w/CCITT) 3. Squelch Sensitivity: 6-8dB (12dB SINAD) 4. Bandwidth: > 3kHz(6dB ATT point) 5. Selectivity: < -60dB(12.5kHz) 6. Local Frequency Stability: +/- 2.5ppm (-20 degreesC - +60 degrees C 7. Spurious Response: > 40dB 8. Audio output: 200mW(Internal 8 ohm load THD 10%) Ext.100mW 9. Distortion: < 5% (1kHz 60% Modulation) 10. RX Audio Response: 6dB/OCT +/-3dB DE-EMPHASIS (300Hz +/-2.5kHz 11. S/N Ratio: < 40dB(1kHz 60% modulation w/CCITT) 12. IF: 1'st IF = 21.7MHz 2'nd IF = 450kHz 13. Local Frequency: 1st Local Frequency = fc - 21.7MHz 2nd Local Frequency = 21.25MHz 4) Operation a) Key Name a. Function and Controls 1. Antenna 2. Belt Clip 3. Detachable Belt Clip Button 4. Power Switch 5. Mode/Scan Button 6. Vox Button 7. Lock Button 8. Wx Button 9. Built-in Microphone 10. Battery Cover 11. Charge Terminal 12. External Mic/Speaker 13. LCD Display 14. Push-To-Talk (PTT) 15.Monitor Button 16. Call Button 17. Up Down Button 18. Built-in Speaker b) Icons on LCD a. RSSI (Receiving Signal Strength Indicator) Icon Indicates the receiving signal strength b. Monitor or Receiving Indicator Appears busy icon when the monitor button is long (about 0.5 sec.) used. Short press the Mon button and would be emitting the backlight lamp during 5 seconds. c. CTCSS Indicator Tone digits blink before when the select CTCSS tone CH. d. Auto Channel Scan Indicator SCAN icon appears in the auto scan mode or when the auto scan mode is activated. e. Key Lock Indicator Blinks in auto lock selection mode or when the key lock is activated. f. VOX Indicator VOX icon blinks in VOX selection mode or appears when VOX is activated. g. Battery Level Indicator Battery Level Meter indicates the remaining battery strength. h. Power Save Display P/SAVE icon blinks when the power save is activated. the rate at which the icon blinks varies with the power saving ratio. j. Rx Indicator Appears and RX icon when a signal is being received. l. Hi/Lo indicator When use Hi/Lo power wanted power state. m. Large Segment Display Indicates the channel number in use at the normal mode. When the Function Button is pressed. n. Small Segment Display Displays the CTCSS tone option at the normal mode. o. Roger beep Segment Display ROGER icon appears when the Roger beep activates. p. Tx Indicator Appears and TX icon when a signal is being transmission r. Appears and WX icon when a signal is being received (weather band) c) Key Function a. Power Volume - When power is on, briefly to press the unit on. A short confirming melody will play. b. Mode button - Press this button briefly to enter function edit mode in standby mode. c. Up/Dn button - In the function edit mode, press briefly to shift from the current option in each sub-menu to the next option in the same sub menu. d. Push-to-Talk (PTT) button - Press it firmly and speak into the Built-in Microphone to transmit. - Release it to revert to stand…

Text truncated - open the document above for the full version.

TIMCO ENGINEERING, INC. P.O. BOX 370 849 N.W. STATE ROAD 45 NEWBERRY, FL 32669 PHONE: 888-472-2424 OR 352-472-5500 FAX: 352-472-2030 EMAIL: [email protected] 9/28/01 Mr. Stan Lyles Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 Ref: COLUMBIA TELECOMMUNIATIONS GROUP INC.’S FCC ID: GAFMURS2 CONFIRMATION # EA101950, CORRESPONDENCE ID #: 20779 Dear Mr. Lyles: The battery end-point frequency in this case was the same as the minus 15% frequency and was inadvertently omitted because they were the same. Battery End Point Voltage 4.8 VDC ppm = -0.35 Should you have any questions or require any further information, please advise. Regards, Mario R. de Aranzeta Engineer Sharon A. Hoffman TIMCO ENGINEERING, INC.

7. Circuit Description 1) Frequency synthesizer Frequency synthesizer consists of VCO, PLL IC (built in Prescaler) and loop filter. a) VCO VCO is composed of one VCO. Oscillation circuit takes colpitts circuit using variable Diode. And VCO is composed of D71, Q71,72 C75,76,77,14,15,19,20 and L71. VCO control voltage through loop filter adjusts frequency and Microphone signal through Modulation terminal makes modulation. b) PLL IC PLL IC is adjustable IC to produce the wished frequency, which VCO provides through loop filter. It has internal counter using 21.25MHz reference frequency to make 6.25kHz as reference Signal. VCO frequency from prescaled input is divided signal is compared with Reference signal phase in phase comparator. Built-in charger pump changes voltage (until two signals are in phase) and charged voltage supplies VCO through loop filter to produce the desired frequency. Frequency data associated with channel goes to PLL IC by CPU through CLOCK, DATA. PLL IC enables by strobe line of CPU. c) Loop Filter Loop filter is composed of R72, 73,101,C70,71,72,73 and changes pulse from pin14 to DC. and eliminates harmonic component in pulse. It helps VCO oscillate clearly as DC voltage is supplied into Varicap. 2) Receiver This is composed of Dual Conversion Super Heterodyne. First IF is 21.7MHz. Local oscillator frequency is lower in 1'st IF than Rx frequency. It is called low side injection. Second IF is 450kHz. 2nd local oscillator frequency comes to 21.25MHz. a) Rx/Tx Conversion Circuit Rx signal goes to Rx/Tx conversion circuit through FIXED antenna connector, low pass filter (L333, 334, 209,C334, 336,337,339,) and receiver resonance circuit composed of L211, C213. When transmitting, voltage through R33B, L7, D211 212 supplies, D211,212 of receive input is short and Tx is on condition. When PIN diode is off in condition of Rx, L211 and C213 resonate serially and make impedance matching at receiver band-pass filter. b) Front End Front-End has Q211 to provide a high sensitivity and low noise feature. It employs Saw filter as band pass filter to eliminate image frequency and to produce enough pass band by Q101 input and output. c) Mixer Mixer has one base BFQ67W(Q221) to feature high low noise quality. It has RF signal through C7, F1 and Q211 RF signal from Local oscillator mixed. It develops 1'st IF, 21.7MHz. 1st IF goes to 1st IF amplifier Q231 (BFQ67W) base through X-tal filter F231. IF of mixing signals is selected and taken into X-tal filter. Output impedance of mixer is direct matched with input impedance of X-tal filter. Matching of filter satisfies pass bandwidth of filter, ripple elimination with in pass band, and attenuation characteristic of stop band. X-tal filter is composed of two pole monolithic X-tal filter, 8 kHz of IF bandwidth R231 is used as impedance matching with 1'st IF Amp Q231. d) IF AMP and Detection 1'st IF AMP Q231 supplies IF (U201) mixer input pin16 through output resistor R232 and C231 to need gain in insertion loss of X-tal filter and last stage circuit. Multi-use IF IC makes up of mixer IF AMP. pin1 2’nd local frequency enters to pin16. It supplies mixer of internal IC. Mixer output of IC through pin3 passes 450kHz ceramic filter, supplies 2'nd IF amplifier and limits. After 2'nd IF AMP has a process of enough gain and AM rejection, it comes to quadrature detection. Demodulated audio signal by T201 (Quad Coil) is amplified and comes out to pin9. Detected audio signal through R249, U801B,C,D R824 and input in audio amp. U602 through C830. e) Squelch Circuit Noise component of detected outputs has amplification Squelch threshold is controlled by Resistor R244,246,247 f) Audio Amplifier Demodulated audio signal enters to pin3 of U602. After above signal amplies in U602 pin5 through C830. It comes out to pin5 Then, It reaches at speaker. 3) Transmitter When Tx develops with pressing PTT switch, VCO output amplifies through Q321, Q7 transmit by antenna through low pass filter. Tx RF signal produced from Tx VCO Is amplified by Driver Q321 through C331 and entered Q7 Power TR input terminal with final amplification. After this stage, the signal is emitted at antenna through 50•ÿmatching circuit to low pass filter (L333, 334,209,C334, C336, 337,339) to eliminate harmonic. a) Audio Modulation and Audio Amplification Audio signal produced by external or internal microphone, limits amplification by U701. It enters to VCO through low pass filter and U801. Max. Frequency modulation deviation is R27 keeps noise and audio from entering to VCO at time of Tx. Audio modulation and Audio Amplification has characteristic of 6dB/OCT pre-emphasis by U801-D (BA10324).

MURS.sch-1 - Fri May 18 15:18:01 2001 MURS.sch-2 - Fri May 18 15:23:24 2001

APPLICANT: COLUMBIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUMBIA\596ZAK1\596ZAK1TestReport.doc TABLE OF CONTENTS TABLE OF CONTENTS LIST APPLICANT: COLUMBIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 TEST REPORT: PAGE 1......COVER SHEET - GENERAL INFORMATION & TECHNICAL DESCR. PAGE 2......TECHNICAL DESCRIPTION CONTINUED PAGE 3......RF POWER OUTPUT PAGE 4......AUDIO FREQUENCE RESPONSE PAGE 5......MODULATION LIMITING – 300 Hz PAGE 6......MODULATION LIMITING – 1000 Hz, 3000 Hz PAGE 7......EMISSION BANDWIDTH PAGE 8-9....OCCUPIED BANDWIDTH PLOTS PAGE 10.....METHOD OF MEASURING OCCUPIED BANDWIDTH PAGE 11.....FIELD STRENGTH OF SPURIOUS EMISSIONS PAGE 12.....METHOD OF MEASURING RADIATED SPURIOUS EMISSIONS PAGE 13.....FREQUENCY STABILITY PAGE 14.....LIST OF TEST EQUIPMENT EXHIBITS CONTAINING: EXHIBIT 1.........FCC ID LABEL SAMPLE EXHIBIT 2.........SKETCH OF FCC ID LABEL LOCATION EXHIBIT 3A........EXTERNAL PHOTO - FRONT VIEW EXHIBIT 3B........EXTERNAL PHOTO – REAR VIEW EXHIBIT 3C-3D.....EXTERNAL PHOTO – SIDE VIEWS EXHIBIT 3E........EXTERNAL PHOTO - TOP VIEW EXHIBIT 3F-3G.....INTERNAL PHOTO - COMPONENT SIDE EXHIBIT 3H........INTERNAL PHOTO - SOLDER SIDE EXHIBIT 4.........BLOCK DIAGRAM EXHIBIT 5A-5B.....SCHEMATICS EXHIBIT 6.........USER'S MANUAL EXHIBIT 7.........CIRCUIT DESCRIPTION APPLICANT: COLUMBIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUMBIA\596ZAK1\596ZAK1TestReport.doc PAGE #: Page 1 of 14 GENERAL_INFORMATION_REQUIRED FOR_TYPE_ACCEPTANCE 2.1033(c)(1)(2)COLUMBIA TELECOMMUNICATIONS GROUP, INC.will manufacture the FCC ID: GAFMURS2 MULTI USER RADIO SERVICE TRANSCEIVER in quantity, for use under FCC RULES PART 95. The UUT is a PTT Radio with a maximum duty cycle of 50%. COLUMBIA TELECOMMUNICATIONS GROUP, INC. 174 MILBAR BLVD. FARMINGDALE NY 11735 USA 2.1033 (c) TECHNICAL_DESCRIPTION 2.1033(c)(3) Instruction book. A draft copy of the instruction manual is included as EXHIBIT 6. 2.1033(c) (4) Type of Emission: 9K6F3E 95.632 Bn = 2M + 2DK M = 3000 D = 2.0K Bn = 2(3.0)+2(1.8) = 9.6K Authorized Bandwidth – 11.25 kHz for frequencies: 151.820, 151.880, 151.940 MHz Authorized Bandwidth - 12.5 kHz for frequencies: 154.570, 154.600 MHz 2.1033(c)(5) Frequency Range: 1. 151.820 95.632 2. 151.880 3. 151.940 4. 154.570 5. 154.600 2.1033(c)(6)(7) Power Output shall not exceed 2.0 Watts effective 95.639 radiated power. There can be no provisions for 95.649 increasing the power or varing the power. The antenna is an intergral part to the unit, it cannot be removed without rendering the unit inoperative. In order to remove the antenna the case must unscrewed, then the PCB assemblies must be removed then the antenna can be removed. APPLICANT: COLUMBIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUMBIA\596ZAK1\596ZAK1TestReport.doc PAGE #: Page 2 of 14 2.1033(c)(9) Tune-up procedure. The tune-up procedure is included in the IN USER'S MANUAL. 2.1033(c)(8) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY High - Vce = 6.0 Volts DC Ice = 0.5A Pin = 3 Watts Low - Vce = 6.0 Volts DC Ice = 0.13A Pin = 0.78 Watts 2.1033(c)(10) Complete Circuit Diagrams: The circuit diagram is included as EXHIBIT 5A & 5B of this report. The block diagram is included as EXHIBIT 4 of this report. 2.1033(c)(11) A photograph or a drawing of the equipment identification label is included as exhibit No. 1. 2.1033(c)(12) Photographs(8"X10") of the equipment of sufficient clarity to reveal equipment construction and layout, including meters, labels for controls, including any view under shields - See EXHIBIT 3A-3H. 2.1033(c)(13) Digital modulation is not not used in this device. 2.1033(c)(14) The data required by 2.1046 through 2.1057 is submitted below. APPLICANT: COLUBMIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUBMIA\596ZAK1\596ZAK1TESTREPORT.DOC PAGE #: Page 3 of 14 2.1046(a) RF_power_output. 95.639(g) RF power is measured by measuring the radiated power at 3 meters and then replacing the transmitter with a signal generator to determine the effective radiated power. The ERP shall not exceed 2.0 Watts. MEASURED POWER OUTPUT = 0.5 Watts ERP HIGH POWER .033 Watts ERP LOW POWER R.F. POWER OUTPUT HP TEST SET UP Spectrum Analyzer TRANSMITTER UNDER TEST WITH INTERNAL ANTENNA <-- 3.0 meters---> SIGNAL DIPOLE Tuned, Calibrated GENERATOR ANTENNA Antenna which may be raised from 1 to 4 meters above ground and changed in polarization Equipment placed 80cm above ground on a rotatable platform. APPLICANT: COLUBMIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUBMIA\596ZAK1\596ZAK1TESTREPORT.DOC PAGE #: Page 4 of 14 2.1047(a)(b) Modulation_characteristics: AUDIO_FREQUENCY_RESPONSE The audio frequency response was measured in ac- cordance with TIA/EIA Specification 603. The audio frequency response curve is shown below. The audio signal was fed into a dummy microphone circuit and into the microphone connector. The input required to produce 30 percent modulation level was measured. Columbia Telecomm GAFMURS2 0 0.5 1 1.5 2 2.5 3 3.5 4 100100010000 Frequency rms mVolts audio response APPLICANT: COLUBMIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUBMIA\596ZAK1\596ZAK1TESTREPORT.DOC PAGE #: Page 5 of 14 2.1047(b) Audio input versus modulation The audio input level needed for a particular per- percentage of modulation was measured in accor- dance with TIA/EIA Specification 603. The audio input curves versus modulation are shown below. Curves are provided for audio input frequencies of 300, 1000, and 3000 Hz. Modulation Limiting Columbia Telecomm GAFMURS2 0 100 200 300 400 500 600 050100150200 rms mVolts Deviation 300 Hz APPLICANT: COLUBMIA TELECOMMUNICATIONS GROUP, INC. FCC ID: GAFMURS2 REPORT #: T:\C\COLUBMIA\596ZAK1\596ZAK1TESTREPORT.DOC PAGE #: Page 6 of 14 Modulation Limiting COLUMBIA TELECOMMUNICATION GAFMURS2 0 500 1000 1500 2000 020406080100120 rms mVolts Deviation 1000 Hz Modulation Limiting Columb…

Text truncated - open the document above for the full version.