20140808125331电路图.pdf

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1、T.M. No. 1071 001 TECHNICAL MANUAL FM TRANSMITTER 994 6745 001 HARRIS ORPORATI0N B Products Division Revision A: RadioFans.CN 收音机爱 好者资料库 FM-20H3 PM TRANSMITTER MANUAL REVISION HISTORY MCN ORJ MeN OR REV.NO.I REV. DATE A-I 01/18/82 ECN NO. ENG REQUEST DESCRIPTION OF CHANGE Revision A: January 1981 Ad

2、d Addendum entitled Harris Engineering Department Power Distribution Recommenda- tion. 888-1071-001 RadioFans.CN 收音机爱 好者资料库 / . (WARNINGI THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS. PERSONNEL MUST AT ALL TIMES onSERVE SAFETY WARNINGS, IN STRUCTIONS AND REGULA nONS. This manual is inte

3、nded as a general guide for trained and qua Ii fied personnel who arc aware of the dangers inherent in hand ing potentially hazardous elcctricaVeleclIonic circuits. It is nOl intended to contain a complete statement of all safety precautions which should be obscrvc , ., . ,. Ii . . . . y 9 . , . Saf

4、ety Notice . of Book 1 a r. . . III , w . . , , , . III . of Description . . . . . . . . . . . . Vacuum Tube Table . . . . . . . . FM-Technical Data . INSTALLATION Inspection Check Lis t . . Tube Handl SECTION 1 -GENERAL DESCRIFTION 1.1 Warranty This equipment is guaranteed under the Gates The terms

5、 and conditions are explained in the Gates Warranty which is printed inside the front cover of this manual. Most Gates manufactured items are guaranteed for one year, with the exception of tubes and moving parts, which are subject to specific warranties based upon hours of usage. The Warranty does n

6、ot extend to flno charge service in the field. 1.2 Safety Notice 1.3 This equipment employs voltages which are dangerous and may prove fatal if contacted operat personnel. Extreme caution should be exercised when working with the pment, Observe safty regulations, Do not change tubes or make adjustme

7、nts inside equipment with any voltages ON, ile your Gtes transmitter is fu inter- locked you should not on the interlock switches for r high operat voltages. It is always best to disconnect the primary power at the buil wall switch and discharge all tors with the groundin stick provided. e of Book T

8、his instruction book has been to assist in the installation, operation, and maintenance of the Gates FM-20H3 20 kW Transmitter. 1.4 Purpose of Equipment The Gates FM-20HJ is a FM broadcast transmitter with the iIity of del 21,500 Watts power output to the transmission line. The transmit ter is desi

9、for continuous broadcast operation in the 88.1 to 107,9 MH band. Performance will meet or exceed those ications required by the Federal Communication Commission for standard FM broadcast service. 1,5 Description The FM-20H3 transmitter is housed in two cabinets utilizing only ten square feet of floo

10、r space. The transmitter cabinet is wide .x 32-3 x 78 h The high vol power supply cabinet is 30 n x 30 X 49 high, and it may be positioned apart from the transmitter cabinet. Complete aCCeSs to the interior of both cabinets is possible by doors or removable panels. 1-1 Wrnine. disconnect primary pow

11、er to servicing. 1.6 1.7 1 2 Front doors are dGd 00 Ihe transmitter cabinet to offer a pleasing and symmetrical front view appearance. All necessary operational metering is provided by four meters located on the meter panel above the front doors. The following controls are also located on the meter

12、panel. (a) Filament ON (b) Filament OFF (c) Plate ON (d) Plate OFF ) Filament Voltage Meter Switch (IPA or FA) Controls listed below are located behind the front doors. VSWR Cal ( P.,Tr Cal (c) For Pwr-VSWR Cal-VSWR ( d) PA Filament (e) Multimeter (f) IPA Screen (g) PA Screen Raise-Lower (h) IPA Fil

13、ament (i) Remote Local (j) IPA O,L. Vacuum Tube Table vI V2, v3 4CX15,OOOA 4CX250B (k) Recycle 0) PA Remote Plate Current PA O.L. ( PA Remote Plate Vol (0) PA Plate (p) FA Outout (q) (r) (s) IPA Grid Tuning Function Power Amplifier (PA) Intermediate Power Amplifier ( FM-20H3 Data (Monaural) RF Outpu

14、t Output Termination Maximum VSWR Modulation Audio Input Audio t Audio Response Audio Distortion PM Noise Level AM Noise Level 7 to 21.5 kW 88.1 to 107.9 MHz 50 ohms Standard EIA 3-1/8 L 7:1 -80 dB + .001% + 100 kHz 600 ohms + 10 dBm, 2 dB 1 dB, 30-15,000 liz % or less, 30-15,000 Hz 65 dB below 100%

15、 FM modulation (400 Hz 50 dB below AM modulation Warnin, disconnect primary power prior to servic i- o -.; ,. Power Source Voltage 208/230/240/250 V., 3 phase, 60 Hz (See Caution Note, bottom of page) 115 V., 1 phase, 60 Hz Power Source Variation (Slow) Power Factor Power Input Requirement Ambient T

16、emperature Range Al ti tude Transmitter Cbinet Size Power Supply Cabinet Size Weight (Total) Front Door Swing FA Tube Dissipation (Maximum) Blower Air Flow + 5% .90 30 kW., 240 V; 300 W. 115 v. -200 C to +450 C 7500 feet 42!f wide x 32-3/4*deep x 78 high * 30fT wide x 30 deep x 49! high 2000 pounds

17、21 15,000 W., 850 BTU/Minute 660 c.f.m. 4 inches of wIter pressure * 32-3/4l! is overall depth dimension. With rear door, front door handles and meter trim strip removed the minimum depth is 29-3/4. * R.F. plumbing extends 12-7/8 above cabinet top. CAUTION THIS EQUIPMENT IS DESIGNED FOR CONNECTION T

18、O A CLOSED DELTA THREE PHASE POWER SERVICE Warning, disconnect primary power prior to servicing. 1-3 .- o . - ) I 4. Chan the 2000 V d.c. power transformer pr1mary configuration from a delca to a wye connection. 5. Add lead. a resistor in series with the IPA plate vol 6. Changing the 9000 V d.c. pow

19、er transformer primary configuration from a delta to a wye connection. 5.9 FM Noise. Measurements 5.10 1. The blower vibration will cause noise if the shock mounts on the blower base are t tened too Recurely. The studs should be flush with the top of the nuts, 2. The polarity connection of the lIS V

20、. AC supp to XFl and XF2 should be connected for minimum noise. Second Harmonic Filter completion of installation of the transmitter a check should be made on the t tness of the Allen set screws at the end of the second harmonic trap. There are two set screws that secure the short to the center cond

21、uctor. If become loose for any reason and light contact is made between the brass short and the center conductor, heat- ing at this may occur, resulting in possible and eventual destruction of the short and other parts of the filter. A regular check on the tightness of these screws should be made at

22、 six month intervals, as t of the orevencive maintenance program for the transmitter. Wa , disconnect pr power to servic 5-3 FM IN THE TV BAND sharp urge in FM broadcasting has in some instances developed unlooked for inle ence with local TV reception. In eve instance this inte renee is in so-called

23、 i1 e areas for TV reception and where the strength of the signal is weak that outside TV antennas aTe necessary. -When this c quickly arns from his service man that the local FM station -The FM broadcaster is immediately deluged with r ts to eliminate the erence. In some s CATV (Community Antenna T

24、 sion) systems are 0 d as they up weak TV stations. What is the FM broadcaster 5 responsibility? To meet r as related to harmonic M equipment but not to guarantee TV re Below is a t showing the and sound frequencies of TV stations between C els 7 13 inclus 2 -6 are not shown. FM harmomcs do not all

25、in these Channels. In fact, commercial FM station har affect Channels 8 and above -look at chart. TV Channel Picture Fr Band -Mc-Sound Fre 7 8 9 10 11 12 13 175.2.5 to .50 1 8 1. to 185. 5 0 1 87 . 2 5 to 19 1. 5 0 193.25 to 197.50 1 .25 to 203.50 2 .25 to 209.50 2 1 1 . 2 5 to 2. 15. 5 0 1 185.75 1

26、91.75 197.75 203.75 209.75 215.75 equency e lor commercial br 92.1 Mc to 107.9 M c: To determine the second harmonic of your FM frequency. t multiply your by 2. Example: Ii your frequency is 99.9 Me, multiplied by 2. would a second hal 199.8 Mc. By cons the above you will note the second pornon of T

27、V 1 L Correct FM Radiation T s that transmitters of 3000 watts power and over must a attenuation of 80 db. For 1000 watts. 73 db., and for 250 watts. 66.9 db. All reputable manufacturers des their FM transmitters to meet or exceed these specifications. Fr Versus FM Hal Let:! take a typical FM that r

28、adiates 70,000 microvolts per meter at 1 mile. At 80 db. hnrrnonic attenuation (as called by F ), this s will radiate approximately 7 microvolts per meter at 1 mile on 5 econd hal c. In the caSl of our Channel 11 example, it is estimated that a area TV station from 60 to 90 5 distance would have str

29、 of from 5 to 25 microvolts per meter, It can be easily stood that a 7 microvolt S1 well within FCC spe cifications, would d ly interfere with the TV signal, yet with ilie FM broadcasters equipment perfor nor This is sometimes furLher aggravated by the FM station being located betwl:en the TV statio

30、n and the TV receivers. In this instance the TV antennas are focussed not only on the TV station but your FM station as well. The home TV antennas are beamed at your legal second harmonic as well as the fTinge TV station. What To Do When interference occurs, it will develop ragged horizontal lines o

31、n the TV picture varying with the FM program content. If the TV sound portion is interfered with (usually not the case), then the FM signal will be heard in addition to the TV sound. 1. It is not up to the FM broadcaster to go on the defensive. He did not put the TV station 75 miles away nor did he

32、select the TV Channel. -In most instances the condition is a natural phenomena that neither you, the TV station, nor the FCC can correct. 2. Do not adjust the FM harmonic or T notch filters supplied with the FM transmitter. These are factory adjusted and most FM stations do not have the expensive eq

33、uipment necessary for correct adjustment. Tampering with this calibrated adjustment will probably make the condition worse. 3. Do not rely on TV service mens types of measuring equipment. They are not built to accurately measure harmonic;.s and invariably give erroneous readings that invite the CATV

34、 or local service mens association to say I told you so. to Remember it is difficult to radiate harmonics if the equipment is built to suppres 5 the harmonics and it is. 4. In many instances interference may be caused by overloading on the front end of the TV receiver. This problem usually occurs wh

35、en the receiver is located close to the FM transmitter. This problem can be overCOITle by installing a trap tunedto the frequency of the FM carrier. The TV service man can and must learn how to do this. In most cases it works, while in some instances, if not properly installed or tuned, it will not

36、completely eliminate the interference. In one case where interference of this type existed, a TV station put trlps for the fundamental FM frequency on nearly every TV set in town. Not the FM transmitter. Summary The FCC is well acquainted with this nation-wide problem. If TV viewers write FCC, compl

37、aining about your FM station. remember the FCC has received a few thousand similar letters. -It is not the obligation of the FM broadcaster to assure fringe area reception of a TV station any more than is the obligation of the TV station to assure the FM broadcaster perfect reception in his TV city.

38、 Probably your installation Will not have pr oblems as outlined above. If they do exist, dont blame the equipment. Every transmitting device puts out a second harmonic, even the TV stations. The act that these harmonics legally fall into the spectrum of a TV station many miles distant is coincidenta

39、l, but not your fault. t-APlRIS CORPORA TION OrOOoX:G5t P:.;OuCl5-D,v,!,on 2 J . f . .nh.,( Slrc-et QUln c v IIl1nOI 67;1() 1 ,. I o ,. ELECTRICAL PARTS LIST Bl B2 B3. C4 CS C6 C7 C8 thru C16 Cl7 thru C20 1 C22 C23 Main Blower Assembly/with 432 0137 000 Motor for Bl 436 0076 000 208/240 Vac, 3 phase

40、, 50/60 Hz, o RPM non:nal, , continous duty Motor, 436 0013 000 Motor, 1500 436 0004 000 RPM, 1 V, 60 Hz .01 uF 1 kV Neutral Cap, Plate Variable Vacuum, 10-100 pF, 15 kV 500 pF 15 kV Cap 500 5 kV Cap 1000 pF 5 kV Cap Feedthru 1000 of 1 kV 2200 500 V. 5? Cap 100 pF 15 kV 516 0082 000 814 3152 001 514

41、 0194 000 516 0713 000 516 0205 000 516 0206 000 5 0361 000 500 000 516 0209 000 C24 Variable 520 0277 000 6-11 pF Rev. lO/7l, -1- C25 C26 thru C30 1 C32 C33, C34 s, C38 C39 C40 C41 thru C48 C50 thru C54 css Cap 5 kV 5 000 _ Feedthru 516 000 1000 of, 500 V. Cap DF 0334 000 5000 V. . Variable 5.2-30

42、Cap .01 uF 1 kV .001 uF 1 kV . 15 uP 450 V. Cap 8 uF 3000 V. 4.5 uF 10 kV _ 500 500 V. Neut. thru Stud to Socket X(2) Not Used 1000 pF 5 kV 520 0158 000 516 0082 000 516 0054 000 522 0133 000 0612 000 510 0687 000 516 0250 000 516 0206 000 Cap of Tube Socket XV2) , disconnect power prior to servic E

43、LECTRICAL PARTS LIST SYMBOL DESCRIPTION GATES PART if C56 C57 CS8, C59 C60 thru e66 C67 CG8, C69 C70, e7l CR2, CR3 CR4 Cap of Tube Socket XV3) Cap .01 uF 1 kV Cap v. . 4300 15 kV Cap 500 15 kV 200 pF 7.5 kV Cap 1000 pF 5 kV 500 pF 5 kV Zener Diode IN2974 516 0 000 0281 000 516 0390 000 516 0713 000

44、516 0210 000 516 0206 000 516 000 386 0016 000 Silicon Diode 384 0020 000 IN2071 DCI , 40 kW 620 0399 000 (Part of Notch Filter Assy.) -2- SYMBOL DESCRIPTION GATES PART If DSI thru DS7 DS8, DS9 FI, F2 F3 thru F5 F6, F7 F8 Light, Fuse ndicat 230 V. Light, 41381 Fuse IDA 250 V Fuse 8A V Fuse 6A 250 V

45、406 0358 000 396 0182 000 398 000 398 0213 000 0181 000 Fuse lA V 398 0017 000 FLI Low Pass Filter 994 72 001 (88-92 MHz and FLI FL2 J2, J3 J4 98-108 MHz) Low Pass Filter 994 6172 002 (92-MHz) Notch Filter ; ;ac:o F :u. - . L-4 R5B- :; V2.V. R57 T2 _ -= - . Iitllii . . . _ ,.,_., . .! K5 _ 81 83 51-

46、52 . :!;!. -J:-;,m S3-S4 . 517 I. -. ,ft. -_S16 rE -R 5 if R22 M5 M6 R43-R44 82 K9 CR2-CR3 t-Z4-Z9 T5 C39 K12 r-i-K 1 1 ZLl A I _ F1-F2 HARRIS ENGINEERING DEPARTMENT POffiR DISTRIBUTION RECOMMENDATION Radio and Television transmitters us three-phase power must operate with the line-ro-line voltages

47、well balanced. t with the i line- to-line vol s substant ial unba lanced will rease the ripple from the three-phase power supplies, primari at Ce the power line , and thus increase the hum of the transmitter. Unbalanced line voltages result In unbalanced currents in the ndings of the three-phase tra

48、nsformers, and unbalanced currents in the wind of th motors. Three-motors should be run with 1 ine vol balance within 1%; a a temperature rise ap- the greater of the un- 3-1/2 proximat line voltage unbalanced will above normal in the winding balanced currents, while a unbalance wi 11 produce a ture rJ . se approximately 50% greater