GAFWT-SGWalkie Talkie

MIC AMP RF OSC 40.680MHz RF AMP RF FILTER RF AMP OSC 49.405MHz AUDIO AMP ANT DEMODULATOR KA3361 FILTER 455KHz

MIC AMP RF OSC 49.860MHz RF AMP RF FILTER RF AMP OSC 40.225MHz AUDIO AMP ANT DEMODULATOR KA3361 FILTER 455KHz

Columbia Telecommunications Group Inc. FCC ID: GAFWT-SG EXHIBIT C - EUT PHOTOGRAPHS Chassis - Front View Chassis - Rear View Columbia Telecommunications Group Inc. FCC ID: GAFWT-SG Chassis - Top View Chassis - Bottom View

EXHIBIT A - FCC PRODUCT LABELING AND WARNING STATEMENT FCC ID Label Specifications: Text is black in color and is left justified. Labels are printed in indelible ink on permanent adhesive backing and shall be affixed at a conspicuous location on the EUT. Proposed Label Location on EUT Bottom side of EUT FCC Warning Statement The device shall bear the following FCC Warning Statement. If the EUT is too small or for such use that it is not practicable to place the statement on it, the statement could be put in the conspicuous location of the user manual or the pamphlet supplied to the user or, alternatively, shall be placed on the container in which the device is marketed. “ 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.” FCC ID: GAFWT-SG

Columbia Telecommunications Group Inc. FCC ID: GAFWT-SG Main Board - Component View Main Board - Solder View

CIRCIUT DESCRIPTION MODEL: 1. Receiver Section Radio Signal received by the Antenna, passing through the band pass filter T5 T3 and T8.The RF amplified by Q1 and T6 via 3361CP with XTAL1 three times Self-oscillator signal formed interval frequency, to get intermediate-frequency signals 455Hz. The signal is amplified restrictedly and demodulated by volume control and audio amplifiers Q8 Q7. the sound is then produced by speaker. 2.Transimtter Section In the transmitter section audio signal amplified by Mic Q2 and Q3, and then demodulated with circuit of crystal that formed by Q4 and D2 The signal amplified threefold by Q5. That via low pass filter and is connected the antenna output. 4.POWER SUPPLY Supply voltage of 9v dc is needed to power onwhole circuitry by a 9v battery.

TUNE-UP PROCEDURE UNIT:A 1. TRANSMITTING 1.1 FREQUENCY ADJUSTMENT a) Connect the frequency counter to ANT point. b) Adjust T4 c) Specification: 40.68MHz +/- 100Hz 1.2 TX POWER CHECK a) Connect the RF level meter to the ANT point (RF impedance: 50 Ω ) b) Check the TX Power c) Specification: -10+/-1.5dBm 1.3 MODULATION SENSITIVITY CHECK a) Connect the deviation meter to the ANT point. b) Apply the audio signal 1KHz, 3 mVrms to the test point M+, M- . c) Specification: 2.0KHz Dev +/- 0.3KHz 2. RECEIVING 2.1 QUAD COIL ADJUSTMENT a) Connect the DC voltmeter to the test point AF(IC1 Pin9). b) Adjust the T2. c) Specification: 2.3Vdc +/- 0.2V 2.2 SENSITIVITY CHECK a) Connect the Sinnader meter to test point SP+ ,SP-. b) Reduce the RF output level of signal generator to get the 12dB of Sinnader. c) Specification: <-108dBm 2.3 SPEAKER OUTPUT LEVEL CHECK a) Connect the Audio level meter to test point SP+,SP-. b) Connect the 150Ω load to test point SP+,SP-. c) Turning the volume till its maximum level. d) Adjust the modulation deviation of RF signal generator.(1kHz,2kHz dev) e) Specification: Level =200-250mv. TUNE-UP PROCEDURE UNIT:B 3. TRANSMITTING 3.1 FREQUENCY ADJUSTMENT d) Connect the frequency counter to ANT point. e) Adjust T4 f) Specification: 49.86MHz+/-20Hz 3.2 TX POWER CHECK d) Connect the RF level meter to the ANT point (RF impedance: 50Ω) e) Check the TX Power f) Specification: -12/-1.5dBm 3.3 MODULATION SENSITIVITY CHECK d) Connect the deviation meter to the ANT point. e) Apply the audio signal 1KHz, 3mVrms to the test point M+, M- . f) Specification: 3.0KHz Dev +/- 0.3KHz 4. RECEIVING 4.1 QUAD COIL ADJUSTMENT d) Connect the DC voltmeter to the test point AF(IC1 Pin9). e) Adjust the T2. f) Specification: 2.3Vdc +/- 0.2V 4.2 SENSITIVITY CHECK d) Connect the Sinnader meter to test point SP+ ,SP-. e) Reduce the RF output level of signal generator to get the 12dB of Sinnader. f) Specification: <-108dBm 4.3 SPEAKER OUTPUT LEVEL CHECK f) Connect the Audio level meter to test point SP+,SP-. g) Connect the 150Ω load to test point SP+,SP-. h) Turning the volume till its maximum level. i) Adjust the modulation deviation of RF signal generator.(1kHz,2kHz dev) j) Specification: Level =200-250mv.