Alignment

FCC ID: K66VX-4000UE

Parts List/Tune Up Info

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FCCID_130474

VDC, 15A Alignment 50-ohm Non-reactive Dummy Load: 100W at 1000 MHz Frequency Counter: >0.1 ppm accuracy at 1000 MHz The VX-4000 has been carefully aligned at the factory AF Signal Generator for the specified performance across the frequency range DC Voltmeter: high impedance specified for each version. RF Sampling Coupler(attenuation pad) Realignment should therefore not be necessary except AF Dummy Load: 4 ohm, 20W in the event of a component failure, or alteration of Oscilloscope version. All component replacement and service should Spectrum Analyzer be performed only by an authorized Yaesu representative, IBM PC/compatible computer w/Yaesu CT-71 or the warranty policy may be voided. programming cable and CE-35 channel programming The following procedures cover the sometimes critical editor. and tedious adjustments that are not normally required once the transceiver has left the factory. However, if damage occurs and some parts are replaced, 50-ohms RF Signal realignment may be required. If a sudden problem occurs Dummy load Generator during normal operation, it is likely due to component RF Sampling failure; realignment should not be done until after the Inline Wattmeter Coupler faulty component has been replaced. Transceiver We recommend that servicing be performed only by authorized Yaesu service technicians who are Deviation Meter CT-70 experienced with the circuitry and fully equipped for CT-29 Connection repair and alignment. Therefore, if a fault is suspected, Frequency Cable Power Supply contact the dealer from whom the transceiver was Counter IBM PC 13.8V DC purchased for instructions regarding repair. COM port Authorized Yaesu service technicians realign all circuits and make complete performance checks to ensure compliance with factory specifications after replacing any faulty components. Those who do undertake any of the Alignment Preparation & Precautions following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at A dummy load and inline wattmeter must be connected to realignment are not covered by the warranty policy. Also, the main antenna jack in all procedures that call for Yaesu must reserve the right to change circuits and transmission, except where specified otherwise. Correct alignment procedures in the interest of improved alignment is not possible with an antenna. After performance, without notifying owners. Under no completing one step, read the following step to determine circumstances should any alignment be attempted unless whether the same test equipment will be required. If not, the normal function and operation of the transceiver are remove the test equipment (except dummy load and clearly understood, the cause of the malfunction has wattmeter, if connected) before proceeding. been clearly pinpointed and any faulty components Correct alignment requires that the ambient temperature replaced, and the need for realignment determined to be be the same as that of the transceiver and test absolutely necessary. The following test equipment equipment, and that this temperature be held constant (and thorough familiarity with its correct use) is necessary between 20 and 30°C (68 86F). When the transceiver is for complete realignment. Correction of problems caused brought into the shop from hot or cold air it should be by misalignment resulting from use of improper test allowed some time for thermal equalization with the equipment is not covered under the warranty policy. environment before alignment. If possible, alignments While most steps do not require all of the equipment should be made with oscillator shields and circuit boards listed, the interactions of some adjustments may require firmly affixed in place. Also, the test equipment must be that more complex adjustments be performed afterwards. thoroughly warmed up before beginning. Do not attempt to perform only a single step unless it is Before beginning, connect the transceiver and PC using clearly isolated electrically from all other steps. Have all the CT-71 programming cable as described in the test equipment ready before beginning, and follow all of EEPROM Programming chapter, and download the the steps in a section in the order presented. EEPROM data from the transceiver to the computer. Store this data in a disk file so that it can be saved and retrieved later. Using the table below, program the Required Test Equipment channel, CTCSS, and DCS alignment settings for your transceiver version. Upload this file to the transceiver. RF signal generator: calibrated output level at 1000 MHz (0 dBµ =1.0 µV - closed circuit) Note: Signal levels in dB referred to in this procedure are Deviation Meter (linear detector) based on 0 dBm = 0.5 mV (closed circuit). AF Millivoltmeter SINAD Meter Caution: Do not connect this line to ground, and be Inline Wattmeter with 5% accuracy at 1000 MHz certain that the speaker has adequate capability to Regulated DC Power Supply: adjustable from 10 to 17 handle the audio output from the radio.

Because of the bridge audio amplifier circuit used in the Channel Frequency CTCSS DCS Narrow radio, it is necessary to construct and use a simple audio (simplex) Encode Encode /wide CH1 450.01MHz None None Wide load test adapter as shown in the schematic diagram CH2 465.01MHz None None Wide above, when conducting receiver alignment steps. CH3 479.99MHz None None Wide CH4 450.01MHz None None Narrow CH5 465.01MHz None None Narrow 3.5mm PLUG CH6 479.99MHz None None Narrow CH7 465.01MHz 151.4Hz None Wide Attenuated CH8 465.01MHz None 023 Wide Test Output(1/2) CH9 465.01MHz 151.4Hz None Narrow 2ohms 10W CH10 465.01MHz None 023 Narrow Ground UHF TYPE F + 470uF Channel Frequency CTCSS DCS Narrow 2ohms 10W (simplex) Encode Encode /wide CH1 480.01MHz None None Wide CH2 496.01MHz None None Wide CH3 511.99MHz None None Wide AF Test Adapter Schematic CH4 480.01MHz None None Narrow CH5 496.01MHz None None Narrow CH6 511.99MHz None None Narrow CH7 496.01MHz 151.4Hz None Wide Alignment Channel Frequencies CH8 496.01MHz None 023 Wide CH9 496.01MHz 151.4Hz None Narrow CH10 496.01MHz None 023 Narrow VHF TYPE A Channel Frequency CTCSS DCS Narrow (simplex) Encode Encode /wide CH1 134.01MHz None None Wide PLL & Transmitter CH2 147.01MHz None None Wide CH3 159.99MHz None None Wide Set up the test equipment as shown for transmitter CH4 134.01MHz None None Narrow alignment. CH5 147.01MHz None None Narrow CH6 159.99MHz None None Narrow Maintain the supply voltage at 13.8V DC for all steps. CH7 147.01MHz 151.4Hz None Wide CH8 147.01MHz None 023 Wide PLL VCV CH9 147.01MHz 151.4Hz None Narrow Connect the positive lead of the DC voltmeter to the test CH10 147.01MHz None 023 Narrow point TP1013 (VCV) on the Main Unit, as indicated in the figure, and the negative lead to chassis ground. VHF TYPE C Set the transceiver to the high band edge frequency Channel Frequency CTCSS DCS Narrow channel, then adjust coil on the Unit for 4.2 V on the (simplex) Encode Encode /wide CH1 148.01MHz None None Wide voltmeter. CH2 161.01MHz None None Wide CH3 173.99MHz None None Wide VHF: L1016 / UHF: L1021 CH4 148.01MHz None None Narrow CH5 161.01MHz None None Narrow Key the transmitter, and adjust coil on the Unit for 4.2 V CH6 173.99MHz None None Narrow on the voltmeter. CH7 161.01MHz 151.4Hz None Wide CH8 161.01MHz None 023 Wide CH9 161.01MHz 151.4Hz None Narrow VHF: L1017 / UHF: L1022 CH10 161.01MHz None 023 Narrow Next select to the low edge frequency channel and confirm about 1.0 V (0.8V – 1.2V) on the voltmeter. UHF TYPE A Channel Frequency CTCSS DCS Narrow Key the transmitter, and confirm about 1.0 V(0.8V – 1.2V) (simplex) Encode Encode /wide on the voltmeter. CH1 400.01MHz None None Wide CH2 415.01MHz None None Wide CH3 429.99MHz None None Wide CH4 400.01MHz None None Narrow CH5 415.01MHz None None Narrow CH6 429.99MHz None None Narrow PLL Reference Frequency CH7 415.01MHz 151.4Hz None Wide With the wattmeter, dummy load and frequency counter CH8 415.01MHz None 023 Wide CH9 415.01MHz 151.4Hz None Narrow connected to the antenna jack, and select band center CH10 415.01MHz None 023 Narrow frequency channel, key the transmitter and adjust TC1001 on the Main Unit, if necessary, so the counter frequency is within 100 Hz of the channel center UHF TYPE D frequency for the transceiver version.

alignment, and construct the audio test adapter as described in the box below. Transmitter Output Power (VHF) Select band center frequency channel, and select high With the transceiver set to band center frequency power output level. channel, and the RF signal generator tuned to the same Key the transmitter and adjust by control commands for frequency, set the generator for ±3.0kHz deviation (for high power from the computer for 50 ± 1 Watts as 25kHz steps) with 1kHz tone modulation, and set the indicated on the wattmeter. output level for 1µV at the antenna jack. Select band center frequency channel, and select low Adjust by control commands for tune from the computer power output level. for optimum SINAD, reducing signal generator output Key the transmitter and adjust by control commands for level as necessary for proper meter deflection. low power from the computer for 5 ± 0.1 Watts as indicated on the wattmeter. After the previous step, final signal generator level should be less than 0.25µV for 12dB SINAD. Transmitter Output Power (UHF) Select band center frequency channel, and select high Squelch Threshold power output level. Select band center frequency channel, and the RF signal Key the transmitter and adjust by control commands for generator turned to the same frequency, set the high power from the computer for 40 ± 1 Watts as generator for ±3.0 kHz deviation with 1kHz tone indicated on the wattmeter. modulation, and set the output level for -8dBµ at the antenna jack. Select band center frequency channel, and select low power output level. Adjust the squelch threshold level by control commands Key the transmitter and adjust by control commands for for squelch threshold from the computer so that it just low power from the computer for 5 ± 0.1 Watts as closes (BUSY LED turns off). indicated on the wattmeter. Transmitter Deviation Microphone Audio Modulation Level Select band center frequency channel, and adjust the AF generator for 25mV(-30dBm) output at 1 kHz to the microphone jack. Key the transmitter and adjust by control commands for maximum deviation from the computer for 4.2kHz ± 0.05kHz deviation as indicated on the deviation meter. CTCSS Modulation Level Select band center frequency channel, with 151.4 Hz CTCSS encode, and reduce the AF generator injection to zero. Key the transmitter and adjust by control commands for CTCSS deviation from the computer for 0.7kHz ± 0.05kHz deviation as indicated on the deviation meter. DCS Modulation Level Select band center frequency channel, with DCS 023 enabled, reduce the AF generator injection to zero. Key the transmitter and adjust by control commands for DCS deviation from the computer for 0.7 kHz ± 0.05 kHz deviation as indicated on the deviation meter. Receiver Set up the test equipment as shown for receiver


Document Created: 2000-07-14 02:05:16
Document Modified: 2000-07-14 02:05:16
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