FT8800.pdf

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1、1 Dual Band FM Transceiver FT-8800R Technical Supplement Introduction This manual provides technical information necessary for servicing the FT-8800R Transceiver. Servicing this equipment requires expertise in handling surface-mount chip components. Attempts by non-qualified persons to service this

2、equipment may result in permanent damage not covered by the warranty, and may be illegal in some countries. Two PCB layout diagrams are provided for each double-sided circuit board in the transceiver. Each side of thr board is referred to by the type of the majority of components installed on that s

3、ide (“leaded” or “chip-only”). In most cases one side has only chip components, and the other has either a mixture of both chip and leaded components (trimmers, coils, electrolytic capacitors, ICs, etc.), or leaded components only. While we believe the technical information in this manual to be corr

4、ect, Vertex Standard assumes no liability for dam- age that may occur as a result of typographical or other errors that may be present. Your cooperation in pointing out any inconsistencies in the technical information would be appreciated. Specifications .2 Exploded View check with your dealer. 3 Ex

5、ploded View realignment should not be done until after the faulty component has been replaced. We recommend that servicing be performed only by au- thorized Vertex Standard service technicians who are ex- perienced with the circuitry and fully equipped for re- pair and alignment. Therefore, if a fau

6、lt is suspected, con- tact the dealer from whom the transceiver was purchased for instructions regarding repair. Authorized Vertex Stan- dard service technicians realign all circuits and make com- plete performance checks to ensure compliance with fac- tory specifications after replacing any faulty

7、components. Those who do undertake any of the following alignments are cautioned to proceed at their own risk. Problems caused by unauthorized attempts at realignment are not covered by the warranty policy. Also, Vertex Standard must re- serve the right to change circuits and alignment procedures in

8、 the interest of improved performance, without notify- ing owners. Under no circumstances should any alignment be attempt- ed unless the normal function and operation of the trans- ceiver are clearly understood, the cause of the malfunc- tion has been clearly pinpointed and any faulty compo- nents r

9、eplaced, and the need for realignment determined to be absolutely necessary. Required Test Equipment The following test equipment (and thorough familiarity with its correct use) is necessary for complete realignment. Correction of problems caused by misalignment result- ing from use of improper test

10、 equipment is not covered under the warranty policy. While most steps do not re- quire 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 single step unless it is clearly isolated elect

11、rically from all other steps. Have all test equipment ready before be- ginning, and follow all of the steps in a section in the or- der presented. ?Regulated DC Power Supply: adjustable from 11.5 to 16 VDC, 10 A ?RF Signal Generator with calibrated output level at 500 MHz ?Frequency Counter: 0.1 ppm

12、 accuracy at 500 MHz ?AF Signal Generator ?SINAD Meter ?Oscilloscope ?Spectrum Analyzer ?Deviation Meter (linear detector) ?AF Milivoltmeter ?AF Dummy Load: 8-Ohm, 5 W ?DC Voltmeter: high impedance ?Inline Wattmeter with 5% accuracy at 500 MHz ?50-Ohm non-reactive Dummy Load: 100 watts at 500 MHz ?V

13、HF/UHF Sampling Coupler Set up the test equipment as shown for the transceiver alignment, and apply 13.8 VDC power to the transceiver. Alignment Preparation & Precautions A dummy load and inline wattmeter must be connected to the main antenna jack in all procedures that call for transmission, except

14、 where specified otherwise. Correct alignment is not possible with an antenna. After complet- ing one step, read the following step to determine wheth- er the same test equipment will be required. If not, re- move the test equipment (except dummy load and watt- meter, if connected) before proceeding

15、. Correct alignment requires that the ambient temperature in the repair shop be the same as that of the transceiver and test equipment, and that this temperature be held constant between 68 C and 86 F (20 C 30 C). When the transceiver is brought into the shop from hot or cold air it should be allowe

16、d some time for thermal equaliza- tion with the environment before alignment. If possible, alignments should be made with oscillator shields and circuit boards firmly affixed in place. Also, the test equip- ment must be thoroughly warmed up before beginning. Notes: Signal levels in dB referred to in

17、 alignment are based on 0 dB = 0.5 V (closed circuit). DUAL BAND FM TRANSCEIVER FT-8800R Power Supply 13.8 VDC Pin 5 EXT SP Frequency Counter Deviation Meter Inline Wattmeter 50-ohm Dummy Load RF Sampling Coupler RF Signal Generator 8-ohm Dummy Load SINAD Meter AF Signal Generator 12 Alignment Enter

18、ing the Alignment mode Alignment of the FT-8800R is performed using a front-panel software-based procedure. To perform alignment of the trans- ceiver, it must first be placed in the “Alignment Mode,” in which the adjustments will be made and then stored into memory. To enter the Alignment mode: 1.Pr

19、ess and hold in the “Left” band V/M key and the Hyper Memory 6 key while turning the radio on. Once the radio is on, release these two keys. 2.Press the front panel keys in the following sequence. “Left” band LOW ? “Left” band V/M ? “Left” band HM ? “Left” band SCN ? “Right” band LOW ? “Right” band

20、V/M ? “Right” band HM ? “Right” band SCN. 3.You will now note the appearance of “b-0 REF.xxH” on the display, this signifies that the transceiver is now in the “Alignment” mode. PLL Reference Frequency 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Righ

21、t” band. 2.Tune the “Right” band frequency to 435.050 MHz. 3.Press and hold in the in the “Left” DIAL knob, if needed, to set the Alignment parameter to “b-0 REF.xxH.” 4.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the counter frequency readin

22、g is 435.050 MHz (100 Hz). 5.Press the “Right” band SCN key. 6.Press and hold in the in the “Right” DIAL knob, if needed, to set the Alignment parameter to “A-0 REF.xxH.” 7.Tune the “Left” band frequency to 435.050 MHz. 8.Connect the frequency counter fed through the 0.001 F capactor to the TP1104.

23、9.Adjust the “Right” DIAL knob, as needed, so that the counter frequency reading is 387.800 MHz (100 Hz). RF Front-end Tuning 1.Connect the DC voltmeter to TP1020 on the MAIN Unit, then inject a 439.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Gene

24、rator. 2.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 3.Tune the “Right” band frequency to 439.050 MHz. 4.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-1 TUN.xxH.” 5.Adjust the “Left” DIAL knob, as neede

25、d, so that the DC voltmeter reading is 1.1 V. 6.Tune the “Right” band frequency to 145.050 MHz. 7.Inject a 145.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 8.Adjust the “Left” DIAL knob, as needed, so that the DC voltmeter reading is 1.2

26、 V. 9.Press the “Right” band SCN key. 10. Press and hold in the in the “Right” DIAL knob, if needed, to set the Alignment parameter to “A-1 TUN.xxH.” 11. Connect the DC voltmeter to TP1023 on the MAIN Unit. 12. Tune the “Left” band frequency to 439.050 MHz. 13. Inject a 439.050 MHz signal at a level

27、 of +10 dB (with 1 kHz modulation 3.5 kHz deviation) from the RF Signal Generator. 14. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.1 V. 15. Tune the “Left” band frequency to 145.050 MHz. 16. Inject a 145.050 MHz signal at a level of +10 dB (with 1 kHz modulation 3.

28、5 kHz deviation) from the RF Signal Generator. 17. Adjust the “Right” DIAL knob, as needed, so that the DC voltmeter reading is 1.2 V. TP1020 TP1023 MAIN UNIT TEST POINTS 13 Alignment TX Power Output 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right”

29、 band. 2.Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.” 3.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-2 PWR.xxH.” 4.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so tha

30、t the wattmeter reading is 5 Watts (0.5 Watt). 5.Increase the Transmit Power Level to “MID2.” 6.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (0.5 Watt). 7.Increase the Transmit Power Level to “MID1.” 8.Press t

31、he PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (0.5 Watt). 9.Increase the Transmit Power Level to “HIGH.” 10. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wa

32、ttmeter reading is 35 Watts (0.5 Watt). 11. Tune the “Right” band frequency to 146.050 MHz, then set the Transmit Power Level to “LOW.” 12. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 5 Watts (0.5 Watt). 13. Increase

33、the Transmit Power Level to “MID2.” 14. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 10 Watts (0.5 Watt). 15. Increase the Transmit Power Level to “MID1.” 16. Press the PTT switch to activate the transmitter, and adjus

34、t the “Left” DIAL knob, as needed, so that the wattmeter reading is 20 Watts (0.5 Watt). 17. Increase the Transmit Power Level to “HIGH.” 18. Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the wattmeter reading is 50 Watts (0.5 Watt). TX Deviati

35、on 1.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 2.Tune the “Right” band frequency to 440.050 MHz, then set the Transmit Power Level to “LOW.” 3.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-3 DEV.xxH.”

36、 4.Inject a 1 kHz audio tone at a level of 80 mV from the Audio Generator. 5.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (0.2 kHz) (USA Version: 4.2 kHz (0.2 kHz). 6.Tune the “Right” band frequency to 14

37、6.050 MHz, then set the Transmit Power Level to “LOW.” 7.Press the PTT switch to activate the transmitter, and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is 4.5 kHz (0.2 kHz) (USA Version: 4.2 kHz (0.2 kHz). DCS Tx Deviation 1.Press the “Sub” band DIAL knob momentari

38、ly, if needed, to switch the “Main” band to be the “Right” band. 2.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-4 DCS.xxH.” 3.Tune the “Right” band frequency to 440.050 MHz, then activate DCS with the 023 DCS code, and set the Trans- mit Power Level to “LOW.” 4.

39、Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.60 kHz and 0.80 kHz. 5.Tune the “Right” band frequency to 146.050 MHz, then activate DCS with the 023 DCS code, and set the Trans-

40、 mit Power Level to “LOW.” 6.Press the PTT switch to activate the transmitter (with no microphone input), adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is be- tween 0.60 kHz and 0.80 kHz. 14 CTCSS Tx Deviation 1.Press the “Sub” band DIAL knob momentarily, if needed, to

41、switch the “Main” band to be the “Right” band. 2.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-5 CTC.xxH.” 3.Tune the “Right” band frequency to 440.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Transmit Power Level to “LOW.” 4.Press the

42、 PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. 5.Tune the “Right” band frequency to 146.050 MHz, then activate the CTCSS Encoder with a 100 Hz tone, and set the Tran

43、smit Power Level to “LOW.” 6.Press the PTT switch to activate the transmitter (with no microphone input), and adjust the “Left” DIAL knob, as needed, so that the deviation meter reading is between 0.65 kHz and 0.75 kHz. Center Meter Sensitivity 1.Inject a 440.050 MHz signal at a level of 10 dB from

44、the RF Signal Generator. 2.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 3.Tune the “Right” band frequency to 440.050 MHz. 4.Press and hold in the in the “Left” DIAL knob to set the Alignment parameter to “b-6 CTRL/V.” 5.Press the “Left” ban

45、d LOW key. 6.Press the “Right” band SCN key. 7.Tune the “Left” band frequency to 440.050 MHz. 8.Press and hold in the “Right” DIAL knob to set the Alignment parameter to “A-6 CTRL/V.” 9.Inject a 440.050 MHz signal at a level of 10 dB from the RF Signal Generator. 10. Press the “Left” band LOW key. S

46、-Meter Sensitivity 1.Inject a 440.050 MHz signal at a level of 5 dB from the RF Signal Generator. 2.Press the “Sub” band DIAL knob momentarily, if needed, to switch the “Main” band to be the “Right” band. 3.Tune the “Right” band frequency to 440.050 MHz. 4.Press and hold in the in the “Left” DIAL kn

47、ob to set the Alignment parameter to “b-7 SM L/V.” 5.Press the “Left” band LOW key. 6.Increase the RF Signal Generator output level to +23 dB. 7.Press the “Left” band V/M key. 8.Tune the “Right” band frequency to 146.050 MHz. 9.Inject a 146.050 MHz signal at a level of 5 dB from the RF Signal Genera

48、tor. 10. Press the “Left” band LOW key. 11. Increase the RF Signal Generator output level to +23 dB. 12. Press the “Left” band V/M key. 13. Tune the “Right” band frequency to 230.050 MHz. 14. Inject a 230.050 MHz signal at a level of 5 dB from the RF Signal Generator. 15. Press the “Left” band LOW k

49、ey. 16. Increase the RF Signal Generator output level to +23 dB. 17. Press the “Left” band V/M key. 18. Tune the “Right” band frequency to 350.05 MHz. 19. Inject an 350.05 MHz signal at a level of 5 dB from the RF Signal Generator. 20. Press the “Left” band LOW key. 21. Increase the RF Signal Generator output level to +23 dB. 22. Press the “Left” band V/M key. 23. Tune the “Right” band frequency to 850.05 MHz. 24. Inject an 850.05 MHz signal at a level of +3 dB from the RF Signal Generator. 25. Press the “Left” band LOW key. 26. In