K66VXA-120Air Band Transceiver

VXA-120 AVIATOR PROII OPERATING MANUAL 1 INTRODUCTION The Yaesu VXA-120 Aviator ProII is compact, stylish, solid hand-held transceiver providing communica- tion (transmit and receive) capability on the International Aircraft Communication Band (“ COMCOM COMCOM COM” band: 118 ~ 136.975 MHz), additionally provides receive on the “ NAVNAV NAVNAV NAV” band (108 ~ 117.975 MHz). The VXA-120 includes our exclusive two-mode display with upright or inverted for easy viewing when on your belt, NOAA weather band monitoring capability, 8 character Alpha/Numeric Display, 50 Memory Chan- nels and 100 Book Memory Channels. We recommend that you read this manual in its entirety, so as to understand the many features of the VXA-120 completely. Keep this manual handy, so you may use it for reference. VXA-120 AVIATOR PROII OPERATING MANUAL 2 CONTROLS & CONNECTORS ( TOP PANEL ) Antenna Jack This SMA jack accepts thee supplied flexible antenna, or another antenna designed to provide 50 Ω impedance on the Aircraft Communication Band. POWER/VOLUME Knob Turn this control clockwise to turn the radio on and to increase the volume. Counterclockwise ro- tation into the click-stop will turn the radio off. CHANNEL Selector Knob This is 20-position detended rotary switch tunes the operating frequency or selects the memory channels. Pressing this knob momentarily selects the tun- ing methods among VFO (Variable Frequency Oscillator), MR (Memory Recall), BOOK (Pre- Programmed Memories), and WX (Weather Channel Memories) mode. LCD (Liquid Crystal Display) The display shows the selected operating condi- tions as indicated on the next page. The display may be changed inverted viewing via the Menu; see page 29 for details. BUSY/TX Indicator Lamp This lamp glows green when a signal is being received and red when transmitting. VXA-120 AVIATOR PROII OPERATING MANUAL 3 CONTROLS & CONNECTORS ( LCD DISPLAY ) This indicator con- firms that the A UTO- MATIC NOISE LIMITER is activated. See page 17. This icon is the “Low Battery” indi- cator, which blinks when the battery voltage becomes too low for proper operation. This indicator con- firms that D UAL WATCH is active. See page 24. This indicator con- firms that the “Split” (Duplex) mode is activated. See page 26. This indicator con- firms that this channel will be skipped during scan. See page 23. These digits provide frequency or alphanumeric information about the channel you are using. This icon indicates that the “Book” Memory Bank is in use. See page 14. This indicator con- firms that Second- ary Key Function is active. See page 5. VXA-120 AVIATOR PROII OPERATING MANUAL 4 CONTROLS & CONNECTORS ( FRONT PANEL ) Loudspeaker The internal speaker located in this position. Microphone Speak across this opening in a normal tone voice while pressing the PTT switch. Keypad Several keys have dual functions. The color of the label determines the way in which you acti- vate the function: The white labels represent the primary functions of the keys (activated by simply pressing the key momentarily). The yellow labels represent the secondary func- tions of the keys (activated by pressing the [ F ] key first, then the indicated key). On the keypad, primary functions (white) are la- beled to the left, while the secondary functions (yellow) are labeled to the right. These functions are described in detail on the next page. Battery Pack Latch Open this latch for battery removal. VXA-120 AVIATOR PROII OPERATING MANUAL 5 CONTROLS & CONNECTORS ( KEYPAD ) Primary Function ( Press Key ) Secondary Function ( Press + ) Primary Function ( Press Key ) Primary Function ( Press Key ) Primary Function ( Press Key ) Frequency Entry Digit 1 Frequency Entry Digit 2 Frequency Entry Digit 3 Frequency Entry Digit 4 Frequency Entry Digit 5 Frequency Entry Digit 6 Frequency Entry Digit 7 Frequency Entry Digit 8 Frequency Entry Digit 9 Frequency Entry Digit 0 Selects Memory Display Type (page 19) Locks the Keypad Selects Emergency Channel ( 121.5 MHz ) NoneNoneNone None NoneNone Activates Automatic Noise Limiter Activates Split ( Duplex ) mode On/Off Switch for Keypad Beeper Allows Skipping of Channel during Scan Activates Scanning Activates “Secondary” Key mode Activates Dual Watch Memory “Write” Command Split-Memory “Write” Command Secondary Function ( Press + ) Secondary Function ( Press + ) Secondary Function ( Press + ) NoneNoneNone None VXA-120 AVIATOR PROII OPERATING MANUAL 6 PTT ( PUSH TO TALK ) Switch Press this button to transmit when you are oper- ating in the “ COMCOM COMCOM COM” band. Release this button to return to the “R ECEIVE” mode. See page 15. MONITOR Switch This button may be pressed to “open” the squelch manually, allowing you to listen for very weak signals. Press and hold this button for 2 seconds, to “open” the squelch continuously. Press this button again to resume normal (quiet) monitor- ing. See page 12. LAMP Switch Press this switch momentarily, to activate the back-lighting lamp for the display. Press and hold this switch for 2 seconds, to activate the back- lighting lamp continuously. To turn the lamp off, press this switch again. The LAMP switch may be configured in several ways via the Menu; see page 28 for details. CONTROLS & CONNECTORS ( LEFT SIDE ) VXA-120 AVIATOR PROII OPERATING MANUAL 7 CONTROLS & CONNECTORS ( RIGHT SIDE ) MIC/EAR Jack You may connect the (optional) CT-60 Headset Cable or the (optional) MH-44 A4B Speaker/Mi- crophone to this jack. Never connect the any Speaker/Micro- phone that is not recommended by the manufacturer. Because these jack connections are unique using a Speaker/Microphone that is not specified by Yaesu will damage the VXA-120. EXT DC Jack When an external 12-Volt DC power source is available, you may connect the E-DC-5B Exter- nal DC Cable here. Do not connect any wire to this jack if that wire is connected directly to a 28-Volt DC source. Connecting the VXA-120 di- rectly to a source which exceeds 15.0 Volts DC will result in damage to the unit. VXA…

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849 NW State Road 45 • P. O. Box 370 • Newberry, Florida 32669 USA Telephone (352) 472-5500 • (888) 472-2424 • FAX (352) 472-2030 • email: [email protected] Memorandum February 8, 2000 Mr. Joe Dichoso: Regarding the application for Yaesu Musen Co Ltd’s Air Band Transceiver: FCC ID: K66VXA-120 Form 731 Confirmation #: EA96244 Date Submitted: 12/14/99 An error was made during the submission process. Could you please correct the emission designator on the 731 form (and subsequent grant). Line one in item 12 (equipment specifications) should have an emission designator of 6K00A3E instead of 3K20A3E, which is incorrect. Your assistance in this matter is greatly appreciated. Thanks, ERIC F. DOBSON

February 24, 2000 FAA Spectrum Engineering Division 800 Independence Avenue S.W. Washington, DC 20591 REF: YAESU MUSEN CO., LTD.’S FCC ID: K66VXA-120 To Whom It May Concern: The application for approval for Yaesu Musen Co., Ltd.’s FCC ID: K66VXA-120 was submitted to the Federal Communications Commission on 12/14/99. We tested the device in accordance to FCC Rules and regulations Part 87 and found that it complies with the requirements. The specifications are listed below: FREQUENCY RANGE: 118-136.975 MHz RATED RF POWER OUTPUT IN WATTS: 1.0 FREQUENCY TOLERANCE: .0020 % EMISSION DESIGNATOR: 6K00A3E ANTENNA CHARACTERISTICS: FLEXIBLE ANTENNA THAT PROVIDES 50 OHM IMPEDANCE ON THE AIRCRAFT COMMUNICATION BAND Please send a reply to this notification to: Sharon A. Hoffma n TIMCO ENGINEERING, INC. P.O. BOX 370 NEWBERRY, FL 32669 Should you have any questions with regards to this, please advise. Regards, Sharon Hoffman SAH/ hs Enc SAH/ hs

VXA-120 Circuit Description 1 VXA-120 CIRCUIT DESCRIPTION Receive Signal Path Incoming RF from the antenna jack is passed through a low-pass filter and high-pass filter consisting of coils L1025, L1027, L1028, L1030, L1031 & L1034, capacitors C1231, C1235, C1236, C1238, C1240, C1242, C1243, C1244, C1245, C1246 & C1248 and antenna switching diodes D1032 and D1033 (both RLS135) to the receiver front end section. Signals within the frequency range of the transceiver is applied to the receiver front end which contains RF amplifier Q1059 (2SC5226) and varactor-tuned band-pass filter consisting of coils L1013, L1016, L1021, L1022, L1032 & L1033, capacitors C1192, C1193, C1194, C1200, C1202, C1204, C1206, C1211, C1217, C1237, C1243 & C1247, and diodes D1027, D1029, D1030 & D1037 (all HVU350), then applied to the 1st mixer Q1061 (2SC5226). Buffered output from the VCO is amplified by Q1023 (2SC5226) to provide a pure 1st local signal between 143.4 and 172.4 MHz for injection to the 1st mixer. The 35.4 MHz 1st mixer product then passes through monolithic crystal filter XF1001 (35M15A1, 7.5 kHz BW) which strips away all but the desired signal, which is then amplified by mixer postamp Q1056 (2SC4215Y). The amplified 1st IF signal is applied to the AM/FM IF subsystem IC Q1047 (TK10931V), which contains the 2nd mixer, limiter amplifier, and AM/FM detector. A 2nd local signal is generated by PLL reference/2nd local oscillator Q1040 (2SC4116GR) from the 17.475 MHz crystal X1002 to produce the 450 kHz 2nd IF when mixed with the 1st IF signal within Q1047. The 2nd IF then passes through the ceramic filter CF1001 (CFWM450F) to strip away unwanted mixer products. In the FM mode, a 2nd IF signal from the ceramic filter CF1001 applied to the limiter amplifier section of Q1047, which removes amplitude variations in the 450 kHz IF before detection of the speech by the ceramic discriminator CD 1001 (CDBM450C24). Detected audio from Q1047 is passed through the de-emphasis, consisting of the resistors R1081, R1089, R1093 & R1135, capacitors C1084, C1092, C1093, C1095 & C1136, and Q1033-2 (NJM2904V), then applied to the AF amplifier Q1005 (NJM2904V). In the AM mode, detected audio from Q1047 is passed through the audio amplifier Q1033-1 YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 10 VXA-120 Circuit Description 2 (NJM2904V) and ANL circuit, then applied to the AF amplifier Q1033-2 (NJM2904V). When impulse noise received, a portion of the AM detector output signal from the AM/FM IF subsystem Q1047, including pulse noise is rectified by D1019 (1SS355). The resulting DC is applied to the ANL MUTE gate Q1028 (FMG2), thus reducing the pulse noises. The processed audio signal from Q1033-2 passes through the audio mute gate Q1014 (DTC124TU) and the volume control to the audio power amplifier Q1005 (TDA72330), providing up to 0.3 Watts to the headphone jack or 8 Ω loudspeaker. A portion of the AF signal from the AM/FM IF subsystem Q1047 converted into DC voltage within the IC, and then passes through the AGC amplifier Q1063 (FMW1) and Q1064 (2SA1602A) to the inversion amplifiers Q1057 and Q1060 (both 2SC5226). These amplifier reduce the amplifier gain of the IF amplifier Q1056 and the RF amplifier Q1059 while receiving a strong signal. Squelch Control When signal is received, appear the DC squelch control voltage at pin 15 of AM/FM IF subsystem Q1047 according to the receiving signal strength. This DC is applied to pin 2 of microprocessor Q1012. The DC squelch control voltage is compared with the SQL threshold level by the microprocessor Q1012. If the DC squelch control voltage is higher, pin 49 of Q1012 goes high. This signal activates the AF MUTE gate Q1014 (DTC124TU), thus disabling the AF audio. Also, the microprocessor stops scanning, if active, and allows audio to pass through the AF MUTE gate Q1014. Transmit Signal Path Speech input from the microphone is passed through the microphone sensitivity potentiometer VR1001, and then applied to the ALC amplifier Q1003 (AN5123MS). The amplified speech signal is passed through the high-pass filter Q1006-1 (NJM2904V) and low-pass filter Q1006-2 (NJM2904V) to the AM modulator D1021 (RN739F). When using the optional headset, the SIDETONE signal from Q1008 (FMG2) becomes “HIGH”, VXA-120 Circuit Description 3 turning Q1011 (TC7S66FU) on, therefore a portion of the speech signal applied to the AF power amplifier Q1005 as a monitor signal. The carrier signal from the VCO Q1019 (2SC5226) passes through the buffer amplifier Q1023 (2SC5226) and TX/RX switch D1018 (MC2848) to the AM modulator D1021, where it is low- level modulation by an amplified speech signal. The modulated signal from D1021 is amplified by Q1043 (2SC5226), Q1049 (2SC3356) and Q1051 (2SK2973), and ultimately applied to the final amplifier Q1055 (2SK2975) which increases the signal level up to 4 watts output power. The transmit signal then passes through the antenna switch D1032 (RLS135), and is low-pass filtered to suppress away harmonic spurious radiation before delivery to the antenna. Automatic Transmit Power Control RF power output from the final amplifier is sampled by C1234/C1239 and is rectified by D1035 (1SS321). The resulting DC is fed through the Automatic Power Controller Q1050 (2SC4116GR) to the APC attenuator D1024 (RN739F), thus allowing control of the power output. Transmit Inhibit When the transmit PLL is unlocked, pin 7 of PLL chip Q1026 (MB15A01PFV1) goes to a logic low. The resulting DC “unlock” control voltage is switches off TX inhibit switches Q1029 (2SA1602A), Q1031 (RT1N241M), Q1035 (2SC4116GR), and Q1036 (DTA143EU) to disable the supply voltage to transmitter RF amplifiers Q1043 and Q1048, disabling the transmitter. Spurious Suppression Generation of spurious products by the transmitter is minimized by the fundamental carrier frequency being equal to the final transmitting frequency. Additional harmonic suppression is provided by a low-pass filter consisting of L1027, L1028 & L1030 an…

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VXA-120 Component Application Location Parts TypeNomenciatureApplication Q1001Transistor2SC4116GRRipple filter Q1002TransistorDTC143ZUAVCO Shift switch Q1003TransistorDTA143EURX SAVE switch Q1004TransistorDTA143EURX SAVE switch Q1005Transistor2SB1132Chag Regulator Q1006Transistor2SC5226VCO Q1007Transistor2SC5226Buffer amplifier Q1008Transistor2SB11323V regulator Q1009TransistorFMW13V regulator Q1010Transistor2SC5226Buffer amplifier Q1011TransistorDTA143EURX switch Q1012ICRH5RH501ADC-DC 5V regulator Q1013TransistorDTC144EUTX unlock switch Q1014ICMB15A01PFV-G-BNDPLL subsystem Q1015Transistor2SC5226Buffer amplifier Q1016Transistor2SA812TX unlock switch Q1017Transistor2SC4116GRTx switch Q1018TransistorDTA143EUTx switch Q1019FET2SK880GRVCV Buffer Q1020TransistorDTC124EUMode SW Q1021Transistor2SC4116GRReference Oscillator Q1022Transistor2SC5226Buffer amplifier Q1023TransistorFMW1TX unlock switch Q1024Transistor2SB1132TX unlock switch Q1025Transistor2SC4116GRRF amplifier Q2026ICTK10930VIF subsystem Q2027Transistor2SC3356Driver amplifier Q1028Transistor2SC4116GRAPC driver Q1029FET2SK2973Exciter amplifier Q1030TransistorFMS1APC driver Q1031Transistor2SC4215IF amplifier Q1032FET2SK2975Power amplifier Q1033ICNJM2904VAF amplifier Q1034Transistor2SC52261st mixer Q1035TransistorDTC144EUAGC Control Q1036Transistor2SC5226RF amplifier Q1037TransistorDTC124TUAF Mute SW Q1038TransistorFMG2ANL SW Q1039FET2SK2170AGC Control Q1041TransistorDTC143ZUAAPC Control Q1042TransistorDTC124TUPower Control Q1043TransistorDTA143EUAPC Control YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 8 Q1044TransistorDTC144EUAGC Control D1001Varactor DiodeHVU350VCO D1002Diode1SS355Ripple filter D1003DiodeSB40W03TRegulator switch D1005DiodeHSU277VCO Shift switch D1006Diode1SS344Chage stabilize D1007Diode02CZ2.0XVoltage limitter D1008Diode1SS302Fast switch D1009Diode1SS355SAVE switch D1010DiodeMA721DC-DC Osc. D1011DiodeDAN202KTX/RX switch D1012DiodeRN739FModulator D1013Diode1SS302Noise detect D1014DiodeRN739FPower atteneter D1015Diode1SS302IF level limitter D1016Varactor DiodeHVU350BPF tune D1017Varactor DiodeHVU350BPF tune D1018Varactor DiodeHVU350BPF tune D1019DiodeRLS135Antenna switch D1020DiodeRLS135Antenna switch D1021Diode1SS302RF level limitter D1022Diode1SS321Power detect D1023Varactor DiodeHVU350BPF tune D1024DiodeMA111ANL D1027DiodeRD5.1UMB2Voltage limitter

VXA-120 Alignment 1 VXA-120 Alignment Introduction The VXA-120 is carefully aligned at the factory for the specified performance across the Aircraft and Weather bands. Realignment should therefore not be necessary except in the event of a component failure. The following procedures cover the adjustments that are not normally required once the transceiver has left the factory. However, if damage occurs and some parts subsequently are replaced, realignment may be required. If a sudden problem occurs during normal operation, it is likely due to component failure; realignment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by authorized Yaesu service technicians who are experienced with the circuitry and fully equipped for repair and alignment. If a fault is suspected, contact the dealer from whom the transceiver was purchased for instructions regarding repair. Under no circumstances should any alignment be attempted unless the normal function and operation of the transceiver are clearly understood, the cause of the malfunction has been clearly pinpointed and any faulty components replaced, and realignment determined to be absolutely necessary. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy Yaesu reserves the right to change circuits and alignment procedures, in the interest of improved performance, without notifying owners. The following test equipment (and familiarity with its use) is necessary for complete realignment. While most steps do not require all of the equipment listed, the interactions of some adjustments may require that more complex adjustments be performed afterwards. Do not attempt to perform only a signal step unless it is clearly isolated electrically from all other steps. Have all test equipment ready before beginning, and follow all of the steps in a section in the order presented. Correction of problems caused by misalignment resulting from use of improper test equipment is not covered under the warranty policy. Required Test Equipment ο Radio Tester with calibrated output level at 200 MHz ο In-line Wattmeter with 5% accuracy at 200 MHz ο 50-Ω, 10-W RF Dummy Load ο Regulated DC Power Supply adjustable from 3 to 15 VDC, 2A ο Frequency Counter: ±0.2 ppm accuracy at 200 MHz ο AF Signal Generator ο AC Voltmeter ο DC Voltmeter: high impedance ο VHF Sampling Coupler Alignment Preparation & Precautions A 50-Ω RF load and in-line wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except where specified otherwise. Correct alignment is not possible with YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 11 VXA-120 Alignment 2 an antenna. After completing one step, read the next step to see if the same test equipment is required. If not, remove the test equipment (except dummy load and wattmeter, if connected) before proceeding. Correct alignment requires that the ambient temperature be the same as that of the transceiver and test equipment, and that this temperature be held constant between 20~30 °C (68-86 °F). When the transceiver is brought into the shop from hot or cold air, it should be allowed some time to come to room temperature before alignment. Whenever possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up before beginning. Set up the test equipment as shown below for transceiver alignment, apply 7.2 VDC power to the transceiver. Refer to the drawings for Alignment Points. PLL Reference Frequency ο Connect the wattmeter, dummy load and frequency counter connected to the antenna jack, and tune the transceiver to 120.000 MHz. ο Transmit, and adjust TC1001 on the RF Unit, if necessary, so the counter frequency is 120.000 MHz (±100 Hz). TX Power Adjustment ο Connect the wattmeter and dummy load to the antenna jack, and tune the transceiver to 128.000 MHz. ο Transmit, and adjust VR1003 to obtain 1.1 W RF (carrier) power indicated on the wattmeter (without audio modulation input). TX Modulation Adjustment ο Connect the Radio Tester to the antenna jack, then adjust the AF generator output level for injection of 200 mV rms @ 1 kHz to the MIC jack. Leave the transceiver tuned to 127.500 MHz. ο Transmit, and adjust VR1002 to obtain 90 % modulation (±5 %) as indicated on the Radio Tester. ο Reduce the AF generator output level to 20 mV rms, then adjust VR1001 to obtain 30 % modulation (±3 %) on the Radio Tester. Internal System Alignment Routine This feature uses a programmed routine in the transceiver which replaces many previously-complex discrete component settings and adjustments with digitally-controlled settings via the CHANNEL selector knob. Transceiver adjustments include:
Squelch Hysteresis Adjustment
Squelch Threshold Adjustment
Squelch “Tight” Adjustment To begin, set the transceiver to 127.500 MHz, and turn the transceiver off. Then, press and holding the LAMP switch, PTT switch and the CHANNEL selector knob while turning the transceiver on.
Squelch Hysteresis Adjustment (HSSQ) VXA-120 Alignment 3  Press the CHANNEL selector knob, then select the squelch hysteresis level using the CHANNEL selector knob.  Next, press the CHANNEL selector knob.  Rotate the CHANNEL selector knob to select the next setting.
Squelch Threshold Adjustment (THSQ)  Inject a –9 dBμ (0.35 μV) RF signal (with a standard modulation: 30 % AM modulation @ 1 kHz), then press the CHANNEL selector knob twice.  Now rotate the CHANNEL selector knob to select the next setting.
Squelch “Tight” Adjustment (TISQ)  Increase the RF signal level to +15 dBμ (5.6 μV), then press the CHANNEL selector knob twice.  Press and hold the in the CHANNEL selector knob for 2 second to save all setting and exit. Resetting the CPU If you are unable to gain control of the transceiver (or if you want to clear all memories and settings to their fa…

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TABLE OF CONTENTS LIST APPLICANT: YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 TEST REPORT: PAGE 1......COVER SHEET - GENERAL INFORMATION & TECHNICAL DESCR. PAGE 2......TECHNICAL DESCRIP. CONTINUED. PAGE 3......RF POWER OUTPUT AND MODULATION CHARACTERISTICS PAGE 4......OCCUPIED BANDWIDTH PAGE 5......METHOD OF MEASURING SPURIOUS EMISSIONS AND SPURIOUS EMISSIONS AT ANTENNA TERMINALS PAGE 6......RADIATED SPURIOUS EMISSIONS PAGE 7......METHOD OF MEASURING RADIATED SPURIOUS EMISSIONS PAGE 8......FREQUENCY STABILITY PAGE 9......CERTIFICATION OF TECHNICAL DATA AND LIST OF TEST EQUIPMENT EXHIBIT CONTAINING: EXHIBIT 1..........POWER OF ATTORNEY LETTER EXHIBIT 2..........FCC ID LABEL SAMPLE AND SKETCH OF LOCATION EXHIBIT 3A.........FRONT VIEW EXTERNAL PHOTO EXHIBIT 3B.........REAR VIEW EXTERNAL PHOTO EXHIBIT 3C.........SIDE VIEW EXTERNAL PHOTO EXHIBIT 3D.........TOP VIEW EXTERNAL PHOTO EXHIBIT 3E.........REAR VIEW W/O BATTERY COVER PHOTO EXHIBIT 3F.........INTERAL COMPONENT SIDE PHOTO EXHIBIT 3G.........INTERNAL SOLDER SIDE PHOTO EXHIBIT 4..........BLOCK DIAGRAM EXHIBIT 5..........SCHEMATIC - MAIN UNIT EXHIBIT 6..........SCHEMATIC - VR EXHIBIT 7..........SCHEMATIC - SW UNIT EXHIBIT 8A-B.......PART LIST EXHIBIT 9..........USER'S MANUAL EXHIBIT 10A-E......CICRCUIT DESCRIPTION EXHIBIT 11A-C......ALIGNMENT PROCEDURE EXHIBIT 12.........AUDIO FREQUENCY RESPONSE PLOT EXHIBIT 13A........MODULATION LIMITING PLOT - 300 Hz EXHIBIT 13B........MODULATION LIMITING PLOT - 1000 Hz EXHIBIT 13C........MODULATION LIMITING PLOT - 3000 Hz EXHIBIT 14.........OCCUPIED BANDWIDTH CW PLOT EXHIBIT 15.........OCCUPIED BANDWIDTH PLOT APPLICANT: YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 DATE: DECEMBER 6, 1999 REPORT #: T:\CUS\Y\YAE\YAE471A9\YAE471A9.RPT TABLE OF CONTENTS GENERAL_INFORMATION_REQUIRED FOR_TYPE_ACCEPTANCE 2.983 (a,b,c) YAESU MUSEN CO., LTD. will sell their FCC ID: K66VXA-120 in quantity, for use under FCC RULES PART 87, AERONAUTICAL GROUND STATION. This UUT has an antenna connector. 2.983 (d) TECHNICAL_DESCRIPTION (2) Type of Emission: 3K20A3E ALLOWED AUTHORIZED BANDWIDTH = 25KHz. Frequency Range: Part 87: 118-137MHz, TEST FREQ = 127.000MHz. (3) Power Range and Controls:The output of this UNIT is NOT adjustable. (4) Maximum Output Power Rating: 1.0 Watt average power into 50 ohms resistive load. (5) DC Voltages and Current into Final Amplifier: FINAL AMPLIFIER ONLY 7.2VDC Vce = 7.20Volts Ice = 0.90A. 2.983(d) (6) Function of each electron tube or semiconductor device or other active circuit device: See Exhibit 8A-8B. 2.983(d) (7) Complete Circuit Diagrams: The circuit diagram is included as Exhibit #: 5-7. The block diagram is also included as Exhibit #: 4. (8) Instruction book. The instruction manual is included as Exhibit # 9. (9) Tune-up procedure. The tune-up procedure is given as Exhibit # 11A-11C 2.983(d)(10) Description of all circuitry and devices provided for determining and stabilizing frequency. The frequency Stability of the K66VXA-120 is described in Exhibit # 10A-10E. APPLICANT: YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 DATE: DECEMBER 6, 1999 REPORT #: T:\CUS\Y\YAE\YAE471A9\YAE471A9.RPT PAGE #: 1 2.983(d) (11) Description of any circuits or devices employed for suppression of spurious radiation, for limit- ing modulation, and for limiting power. The control circuits are described in Exhibit # 10A-10E. 2.983(d) (11) Description of any circuits or devices employed for suppression of spurious radiation, for limit- ing modulation, and for limiting power. Limiting Modulation: The transmitter audio circuitry is contained in the audio processing board and is controlled by that assembly dependent upon which combination of modulation. 2.983(d) Limiting Power: There is no provision for limiting power, the design limits the power to 10Watts. There is NO provision for reducing the power. (12) Digital modulation. This unit does not use digital modulation. 2.983(e) The data required by 2.985 through 2.997 is sub- mitted below. APPLICANT: YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 DATE: DECEMBER 6, 1999 REPORT #: T:\CUS\Y\YAE\YAE471A9\YAE471A9.RPT PAGE #: 2 2.985(a) RF_power_output. RF power is measured by connecting a 50 ohm, resistive watt meter to the RF output connector. With a nominal voltage of 7.2VDC and the trans mitter properly adjusted the RF output measures: INPUT POWER: FOR 7.2V OPERATION (7.2)(0.9) = 6.48Watts OUTPUT POWER: FOR 7.2V OPERATION 1.0WATTS RF. POWER OUTPUT /-------------\ /---------\ /----------\ || |||| | Transmitter |-------------------| 50 ohm |------| RF | | under test | |Resistive| | VOLTMETER| \-------------/ | Load | | | | \---------/ \----------/ | | /---------\ | Power | | Supply | \---------/ 2.987(a)(b) Modulation_characteristics: AUDIO_FREQUENCY_RESPONSE The audio frequency response was measured in accordance with TIA/EIA Specification 603 Paragraph 2.2.6. 87.141 AUDIO_LOW_PASS_FILTER The audio low pass filter is not required in this unit. 2.987(b) Audio_input_versus_modulation See Exhibit # 13A-13C APPLICANT: YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 DATE: DECEMBER 6, 1999 REPORT #: T:\CUS\Y\YAE\YAE471A9\YAE471A9.RPT PAGE #: 3 2.989(c) Occupied_bandwidth: Data in the plots shows that frequencies removed from the assigned frequency by more than 50%(12.5KHz) up to and including 100% percent of the authorized bandwidth the attenuation must be at least 25dB. When the fre- quency is removed fromt he assigned frequency by more that 100% up to and including 250% of the authorized bandwidth the attenuation must be at least 35dB. When the frequency is removed from the assigned frequency by more than 250% of the authorized bandwidth the attenua- tion must be at least 43 + log pY dB. The plots show the transmitter modulated with 2500 Hz(the highest modulation frequency), adjusted for 50% modulation plus 16dB. The spectrum analyzer was set with the unmodulated carrier at the top of the screen. The test procedure diagram and occupied bandwidth plots follow. Microphone transmitter. Test procedure di…

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Yaesu Musen Co., LTD. K66VXA-120 0 5 10 15 20 25 30 35 40 45 100100010000 Frequency mV rms audio response YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 12

Modulation Limiting Yaesu Musen Co., LTD. K66VXA-120 0 10 20 30 40 50 00.020.040.060.08 rms Volts % Modulation 300 Hz YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 13A

Modulation Limiting Yaesu Musen Co., LTD. K66VXA-120 0 10 20 30 40 50 60 70 00.020.040.060.080.1 rms Volts % Modulation 1000 Hz YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 13B

Modulation Limiting Yaesu Musen Co., LTD. K66VXA-120 0 10 20 30 40 50 60 00.020.040.060.08 rms Volts % Modulation 3000 Hz YAESU MUSEN CO., LTD. FCC ID: K66VXA-120 EXHIBIT # 13C