1362 UHF Osc 电路图.pdf

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1、INSTRUCTION MANUAL GENERAL RADIO RadioFans.CN 收音机爱 好者资料库 Contents SPEC1 FlCATlONS TABLE OF CONTENTS INTRODUCTION - SECTION 1 INSTALLATION - SECTION 2 OPERATING PROCEDURE -SECTION 3 APPLICATIONS - SECTION 4 PRINCIPLES OF OPERATION - SECTION 5 SERVICE AND MAINTENANCE - SECTION 6 WARRANTY We warrant th

2、at each new instrument manufactured and sold by us is free from defects in material and workmanship and that, properly used, it will perform in full accordance with applicable specifications for a period of two years after original shipment. Any instrument or component that is found within the two-y

3、ear period not to meet these standards after examination by our factory, District Office, or authorized repair agency personnel will be repaired or, at our option, replaced without charge, except for tubesor batteries that have given normal service. GENERAL RADIO COMPANY 1967 Concord, Massachusetts,

4、 U.S.A. 01742 Form 1362-01 00-8 January, 1971 I D-B552 RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS Frequency Range: 220 to 920 MHz. Tuned Circuit: Butterfly, with no sliding contacts. Frequency Accuracy: k 1%. Warmup Frequency Drift: 0.2% typical total. Frequency Control: A four-inch dial with calibratio

5、n over 300, with a slow-motion drive of about 9 turns. Output Power (into 50 ohms): At least 160 m W with Type 1267 or 1264 Power Supply, 200 m W with Type 1269 Power Supply. Output System: A coupling loop feeds a waveguide- below-cut-off attenuator calibrated over an 80-dB range with 5-dB scale div

6、isions, relative attenuation. Ad- ditional uncalibrated range is provided. Output adjust- ment and locking GR 874 output connector are at the front of the instrument. Modulation: An external audio-frequency plate modu- lator may be connected to the front panel MOD jack. The modulation impedance is a

7、pproximately 3 kn. A sinewave of 20 V rms, amplitude will produce ap- proximately 30% amplitude modulation. For 400 Hz. 1000 Hz and other audio frequency modulation the Type 1311 Audio Oscillator is recommended. The Type 1263 Amplitude-Regulating Power Supply can be used for 1-kHz square-wave modula

8、tion, the Type 1264 Mod- ulating Power Supply for square-wave ,or pulse modula- tion. Power Supply: Four types of power supplies are rec- ommended; the choice depends on the intended ap- plication. Refer to Table of Accessories, paragraph 1.5. Tube: One Y-1266. Mounting: Rack-bench cabinet. Accessor

9、ies Available: Refer to paragraph 1.5. Dimensions: Width 8, height 7-5/8, depth 9 1/2 inches (205 by 195 by 240 mm). See outline below. Net Weight: 8 pounds (3,6 kg). GR 874 Patent No. 2,548,457. Figure 1-1. Panel view of Type 1362 UHF Oscillator with accessories . RadioFans.CN 收音机爱 好者资料库 TABLE OF C

10、ONTENTS Section 1 INTRODUCTION 1.1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Amplitude Modulation . . . . . . . . . . . . . . . . . 3 1.4 Sweep Operation . . . . . . . . . . . . . . . . . . . . 3 1.5 Auxiliary

11、Equipment. . . . . . . . . . . . . . . . . . 3 Section 2 INSTALLATION 2.1 Connection to Power Supply . . . . . . . . . . . . . 5 2.2 Bench Mounting . . . . . . . . . . . . . . . . . . . . . 5 2.3 Rack Mounting . . . . . . . . . . . . . . . . . . . . . 7 2.4 Modulator Connection . . . . . . . . . . .

12、 . . . . . . 8 2.5 RF Output Connections . . . . . . . . . . . . . . . . 8 Section 3 OPERATING PROCEDURE 3.1 Equipment Turn-On . . . . . . . . . . . . . . . . . . 9 3.2 Frequency Adjustment . . . . . . . . . . . . . . . . 9 3.3 Output Adjustment . . . . . . . . . . . . . . . . . . . 9 Section 4 APPL

13、ICATIONS 4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4.2 Signal Generator for Receiver Testing. . . . . . 10 4.3 Local Oscillator in a Frequency Converter. . . 10 4.4 Transfer Oscillator . . . . . . . . . . . . . . . . . . 11 4.5 Swept Oscillator . . . . . . . . . . . . . . .

14、. . . . . 11 4.6 Observation of Modulation . . . . . . . . . . . . . . 11 Section 5 PRINCIPLES OF OPERATION 5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5.2 Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . 12 Section 6 SERVICE AND MAINTENANCE 6.1 Warranty . . . . . .

15、 . . . . . . . . . . . . . . . . . . . 13 6.2 Service . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.3 Minimum Performance Standards . . . . . . . . . 13 6.4 Trouble Analysis . . . . . . . . . . . . . . . . . . . . 15 6.5 Removal of Covers. . . . . . . . . . . . . . . . . . . 16 6.6 Instal

16、lation of Oscillator Tube . . . . . . . . . . . 18 6.7 Frequency Calibration . . . . . . . . . . . . . . . . 19 6.8 Lubrication. . . . . . . . . . . . . . . . . . . . . . . . 19 6.9 Adjustment for Maximum Tube Life . . . . . . . 19 SECTION 1 INTRODUCTION 1.1 PURPOSE. The 1362 UHF Oscillator (Figure

17、1-1) is a gen- eral-purpose oscillator for the radio-frequency lab- oratory. Covering the calibrated range from 220 to 920 MHz, this oscillator provides adequate power to drive bridges, slotted lines, impedance comparators, and other measuring equipment. The output is brought through an attenuator,

18、calibrated in relative power levels, making the oscillator suitable for the testing of receivers. Direct sine-wave, square-wave, or pulse amplitude modulation is possible. Amplitude modula- tion free from incidental fm can be obtained with an external diode modulator. Connected to a mixer, the oscil

19、lator can be used as thelocal oscillator in a het- erodyne receiver to convert the GR 1236 I-F Amplifier, or a low-frequency communications receiver, into a detector for uhf signals. Square-wave and pulse am- plitude modulation can be obtained with the GR Type 1264 Modulating Power Supply (Figure 1-

20、2), or leveled output can be obtained with the GR p p e 1263 Ampli- tude-Regulating Power Supply. 1.2 DESCRIPTION. 1.2.1 GENERAL. The 1362 Oscillator uses a planar triode and is tuned by a butterfly resonator, to provide wide tuning range without switching or sliding contacts. For details refer to p

21、aragraph 5.2. The butterfly rotor is driven 85 through anti- backlash gears by the main dial, turning 330, and the vernier drive, whose 9 turns are each resolved into 100 arbitrary (logging) divisions. Frequency calibra- tion is accurate to +I%. Resolution of 0.1% or better with the logging scale is

22、 described in paragraph 3.2. Jacks are provided for modulation, connection of special-purpose power supplies, and the measurement of plate current. INTRODUCTION 1 Figure 1-2. The Type 1362 UHF Oscillator and the Type 1264 Modulating Power Supply assembled with the Type 0481-P416 Adaptor Plate Set fo

23、r rack mounting. 1.2.2 OUTPUT SYSTEM. The output system is an adjustable coaxial line with a coupling loop on one end and a locking GR874 coaxial connector on the other. Coupling between the loop and the oscillator can be adjusted over a wide, continuous range, and the loop can be clamped in the des

24、ired position. With close coupling, maximum power can be delivered to load impedances normally encoun- tered in coaxial systems. Power available into a 50- ohm load is plotted against frequency in Figure 1-3 for a typical 1362 Oscillator. With loose coupling, the movable line becomes a piston attenu

25、ator, calibrated over a range of 80 dB (refer to paragraph 3.3). 1.2.3 FREQUENCY STABILITY. For most applications a well-regulated and fil- tered power supply should be used to avoid amplitude and frequency variations caused by line-voltage fluc- tuation and to produce a clear audible tone when the

26、output beats with a stable reference. With an unreg- ulated power supply, a line-voltage variation of 10 percent causes an immediate (1 second) frequency change of about 0.002 percent at frequencies up to 500 MHz, and a change of about 0.02 percent at 900 MHz. If the line voltage is held steady for

27、5 minutes after the shift of 10 percent, the frequency change is about 0.02% up to 500 MHz and 0.04% at 900 MHz. Of the power supplies listed in paragraph 1.5, only the Type 1269 is unregulated. The Type 1267, for example, reduces the effect of line-voltage change by a factor of 100 or more. When th

28、e oscillator is turned on for use, a warmup frequency drift (0.2% typical total) will occur until the circuit stabilizes at the set frequency. Fig- ure 1-4 shows typical warmup frequency drift curves. Individual instruments may drift considerably more or less, or even in the opposite sense from the

29、typical. 1.2.4 POWER REQUIREMENTS. The 1362 UHF Oscillator requires an external power supply. The choice among the four General Radio power supplies recommended in paragraph 1.5 should be based on the intended application of the oscil- lator. If a power supply other than one of those rec- ommended i

30、s used, it should be capable of delivering 300 to 330 volts, dc, at 35 mA for the plate, and 6.3 volts at 0.24 ampere for the heater. The negative side of the power supply must be floating, since the positive side is grounded inside the oscillator. 400 , 300 (C W a , 200 = I Figure 1-3. Output power

31、 into a 50-ohm a I- load for a typical Type 1362 oscillator. 3 0 100 0 200 300 400 500 600 700 800 900 1000 FREQUENCY, MHz 1362.1 2 TYPE 1362 UHF OSCILLATOR 1.2.5 ACCESSORIES SUPPLIED. Incidental frequency modulation is about 60 kHz (peak deviation) with 25%- a-m at a carrier frequency Supplied with

32、 the oscillator are a three-foot of 500 MHz, and increases with frequency. coaxial double-shielded Tvpe 874 -R22LA Patch Cord, and a phone plug (P/N 4220-2000, Figure 1-1). 0.2 1 I I I I 1.3.3 SQUARE -WAVE AMPLITUDE MODULATION. Modulation at full-rated output power is obtained with the Type 1264 Mod

33、ulating Power Supply. When operatedwith a Type 1263 Amplitude-Regulating Power Supply, the oscillator provides a levelled rf output of 20 milliwatts, peak, into a 50 ohm load, with 1-kHz square-wave modulation (or cw). 1.3.4 PULSE AMPLITUDE MODULATION. The rise time, starting delay, and jitter of th

34、e 1362 Oscillator depend on the frequency and load con- ditions. Typical values obtained with a Type 1217 Unit Pulse Generator used to drive the Type 1264 Modulat- ing Power Supply are shown in Figure 1-5. I 5 1 5 30 1 2 3 4, 1362.13 MINUTES HOURS Figure 1-4. Typical warmup frequency-drift character

35、istics far the Type 1362 UHF Oscillator with a Type 1267-A Regulated Power Supply. 1.3 AMPLITUDE MODULATION. 1.3.1 GENERAL Amplitude modulation of the signal source (in a test setup having a demodulator followed by a tuned amplifier) permits increased sensitivity of measure- ment compared to cw oper

36、ation. Recommended auxil- liary equipment is described in paragraph 1.5. 1.3.2 SINUSOIDAL AMPLITUDE MODULATION. A jack on the front panel of the oscillator permits plate modulation by connection of an audio oscillator, such as the Type 1311. This function is also supplied at another jack on the left

37、-hand side plate. The mod- ulator must supply a dc path andmust be able to carry 30 milliamperes dc. A sine wave of 20-volts, rms, amplitude, will produce approximately 30% amplitude modulation. 1.4 SWEEP OPERATION. The 1362 Oscillator is well suited for swept operation due to the use of ball bearin

38、gs in the tuning drive mechanism and to the absence of sliding contacts in the rf circuit. Asweep drive can be coupledeither to the slow- motion dial or to the main frequency dial of the oscil- lator. When the main frequency dial is driven directly, the sweep rate should be restricted to one excursi

39、on per second or less. The slow-motion dial can be driven at rates up to 5 cycles per second. The Type 1263 Amplitude-Regulating Power Supply will maintain a constant rf output amplitude as the oscillator is swept. When the oscillator is driven by a sweep or dial drive, all moving parts in the oscil

40、lator must be lub- ricated in accordancewith paragraph 6.8. For recom- mended dial drives, refer to paragraph 1.5. 1.5 AUXILIARY EQUIPMENT. The 1362 Oscillator can be used in conjunction with a variety of auxiliary General Radio equipment Figure 1-5. Typical rise time, starting delay, I and iitter w

41、hen the oscillator is pulsed by the Type 1264 Modulating Power Supply, driven by the Type 1217 Unit Pulse Generator. 200 300 400 500 600 700 800 FREQUENCY. MHz 900 1362.2 INTRODUCTION 3 tobuilda signal-source system that is suitedto speci- should be based onthe intendedapplicationof the oscil- fic r

42、equirements. Typical systems are shown in Fig- lator. ure 1-6. The Type 1263, 1264, 1267 and 1269 power sup- Table 1-1 lists the accessories recommended plies can be readily attached to the oscillator to form for use with the 1362 Oscillator. The choice of a rec- a single unit for bench use or for r

43、elay-rackmounting ommended power supply, modulator, or sweep drive with the listed adaptor plates. POWER SUPPLY MODULATOR OUTPUT VOLTMETER ATTENUATOR OUTPUT VOLTAGE ADJUSTMENT FOR ULTIMATE IN STABILITY TYPE 874-VRL - FOR MAXIMUM OUTPUT AND MlNlMUM COST FOR SINUSOIDAL 400HZ OR lDDD HI 131 1 1M WITH H

44、lGH L E V E L OUTPUT TYPE 814- GAL TYPE 874- WSO BL AOJUSTIISLE TERMlNDiTlON OR ATTENUITOR TYPE 8 7 4 -020LOR TYPE 874- D50L TUNING STUB FOR iOOX SOUARE- MIIYlMUM POWER OSCILLATOR OUTPUT, INTERNAL I-I. I - RF OUTPUT FOR IMPLITUDE - REGULATED CW OR 0 2 TO 2 . 0 VOLT5 BEHIND 5 0 8 TVPE 874-VRL VOLTMET

45、ER RECTIFIER TYPE 874-MRL OR MRAL FOR HETEROOINE MIXER RECTIFIER DETECTOR USE r l O l W 1-6 A Y P L l F E i l OSCILLATOR I LT 8 SIGNAL INPUT (190-950 MHz FOR FUNDAMENTAL MIXING1 Figure 1-6. Typical signal-source systems built with a Type 1362 UHF Oscillator and associated equipment. TVPE 1236 I U D

46、I 1 - 1 ACCESSORIES Function GR Instrument* Remarks POWER SUPPLIES For best stability, freedom from Type 1267 Power Supply Regulated dc plate and heater supplies. line-voltage variations, and min- imum residual fm. For full-power square -wave, Type 1264 Modulating Internal 1 -kHz square-wave generat

47、or pulsed a-m, or cw operation. Power Supply or external pulser (20 Hz to 50 kHz). For amplitude-regulated cw or Type 1263 Amplitude- Leveled output of 20 mW into 50 ohms. 1 -kHz square-wave modulated Regulating Power Supply Requires Type 874-VRL Voltmeter output. Rectifier. ADAPTOR PLATE SETS r - h

48、owever, if the Type 1263 Power Supply is used, proceed with step j. The procedure is as follows: b. Release the two end-frame attaching screws a. Remove the exterior cover from both the ) at the left-hand edge (as seen from the front) of oscillator and power supply by turning the captive the oscilla

49、tor and the power supply (Figure 2-1). thumbscrews at the rear counterclockwise and sliding c. Withdraw the screws and remove the spacers the cover toward the rear. (E) between the panels and the end frames. INSTALLATION 5 d. Slide end frame Y toward the rear and off the oscillator. e. Slide end frame Z toward the rear and off the power supply. f. Slide end frame Y into place where end frame Z was removed. g. Slide end frame Z into place where endframe Y w