RCA WR-99A Operating And Maintenance Instructions Manual Download | Manualshive

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Summary of Contents for WR-99A

Page 1: ...SUGGESTED PRICE ONE DOLLAR operating and maintenance instructions CRYSTAL CALIBRATED MARKER GENERATOR WR 99A RCA I Electronic Components I Harrison N J 07029 ...

Page 2: ...The rf output cable has a shield through out its entire length which is connected to the instru ment ground and case It is always best to handle the cable by the insulation An important point to remember is that there is always danger inherent in testing electrical equipment which operates at hazardous voltages Therefore the operator should thoroughly familiarize himself with the equipment under t...

Page 3: ... D and weighs 17 pounds The WR 99A is housed in a blue gray hammeroid case with a satin aluminum panel Description The RCA WR 99A Crystal Calibrated Marker Gen erator is designed for use in alignment and trouble shooting of black and white and color TV receivers fm receivers and other equipment operating in the fre quency range from 19 to 260 Mc The WR 99A pro vides an rf output signal from 19 to ...

Page 4: ... Audio Amplifier 1 RCA 12AT7 10 and I Mc Oscillator 1 RCA 6US 4 5 Mc and 6OO cpsOscillator 1 RCA 6AS6 Mixer 1 RCA 6X4 Rectifier 1 RCA OA2 Voltage Regulator Power Supply Voltage _ 105 125volts Frequency 50 60 cps Power Consumption 45 watts Mechanical Hei ht 10 inches Width 13lh inches Depth 7 inches Weight 171bs Finieh Blue gray hammeroid case satin aluminum panel Functions of Controls RF RANGE Sel...

Page 5: ...e calibration of the variable frequency oscilla tor from 20 to 260 Mc 5 1 MC CAL Audio calibrating beats are pro vided at I Mc intervals at frequencies which are multiples of 1 Mc throughout the tuning range of the WR 99A Makes possible calibration of the variable frequency oscillator from 20 to 260 Mc 1 MC EXT CAL When a crystal or L C circuit is plugged into the socket at the rear of the instrum...

Page 6: ...y before the instrument can be used to provide accurate marker signals Calibration is accomplished by beating the in ternal variable frequency oscillator signal with either 1 or IO Mc internal oscillator signals These oscilla tors provide harmonic calibrating signals throughout the tuning range of the WR 99A Thus it is possible to accurately calibrate the WR 99A at I Mc or lO Mc intervals from 20 ...

Page 7: ...her side The WR 99A should always be calibrated at the beat point which is nearest to the frequency to he used As an example if it is desired to set the generator accurately to 45 75 MC the procedure is as follows 1 With the CAL MOD control in the 10 MC CAL position pick up the 50 MC beat on the 39 to 50 MC dial scale Slide the pointer if necessary to coincide with the 50 MC dial scale calibration...

Page 8: ...et for c nnection of external crystal or ColpiHs type L C circuit Use of 4 5 Mc Sideband Markers When the WR 99A is set up to deliver an output sig nal on either the picture carrier or sound carrier fre quency of a TV channel sideband markers which are spaced exactly 4 5 Mc each side of the vfo marker may be obtained by setting the CAL MOD control to the 4 5 MC MOD position For example if the WR 9...

Page 9: ... injection the marker is capacitively coupled into the circuit through the ca pacitance between the tube shield and the plate of the mixer tube It may be necessary to increase the rf output from the WR 99A when this procedure is used The advantage of this method is that circuit loading is slight compared with direct coupling methods and dis tortion of the sweep curve is minimized Another method co...

Page 10: ... the WR 99A is coupled into the test circuit a vertical pip or marker will appear on the curve When the WR 99A is tuned to a frequency within the pass band accepted by the re ceiver the marker will indicate the position of that frequency on the sweep trace The technician then adjusts the circuit components to obtain the desired waveshape using the different frequency markers as check points The or...

Page 11: ...re familiar job Adjustments include setting the oscillator frequencies for channels 2 through 13 setting one or more traps to their correct frequen cies and adjustment of tracking with the rf amplifier The converter transformer may also require adjust ment along with the tuner Al these adjustments require that a sweep signal from the sweep generator and a marker signal from the WR 99A be fed into ...

Page 12: ...the two settings is equal to the bandwidth of the amplifier Two kinds of picture if systems are generally used to give the necessary bandwidth The overcoupled if system employes transformers which have their pri mary and secondary windings tuned to the same frequency The transformers are overcoupled to obtain a flat topped response curve of the desired bandwidth The other method the stagger tuned ...

Page 13: ...er sec tion the age circuit should be rendered inoperative by either disconnecting the age bus or by using a bias box as described in the section Eliminating AGC Action The rf cable from the sweep generator is connected to the grid of the if amplifier stage ahead of the stage CRO WR 8tA o TO MIXER o 0 TI 1 OtT LOAD RES Figure 8 Method for checking response of third if amplifier stage and detector ...

Page 14: ...ES ARE IN OHMS EXCEPTt S NOTED 2 CAPACITANCE VALUES LESS THAN 1 0 ARE IN UF S 1 0 S ABOVE ARE IN UUF EXCEPT t S INDICATED 3 SWITCHSI B S2 VIEWED FROM FRONT WHEN IN MAX COUNTERTERCLOGKWISE POSITION 4 ALL VOlJAGES MEt SUREDWITH A VOLTOHMYST INDICATED VOLTAGES ARE FOR REFERENCE ONLY ANO MAY VARY WITH DIFFERENT INSTRUMENTS VOLTAGES MEASURED WITIi CONTROLS SET AS FOLLOWS 51 ON 50 90 MC RANGE N MC CAL P...

Page 15: ...D 1 47 25 V I R4 I C7 l 5OO I I I I I I I I I I I I I I I I I I I I I I I CI2 I f _ f J fO F R6 2700 IW R7 2700 IW r CI3 47 55 100 J2 MQll J r I 1 I J3 BE ti r I J4 I GND I I I I I V7 I EXTERNAL I CRYSTAL ORLC OA2 I I I I XI C 20 R 33 4 7 c 1 vv 58 r l1 f i sbolsbo L 2_ Ll3 i C47 I I I 120 tr s J PI 3 WIRE POWER CORD USED ON SOME MODELS VFO ON OFF 6 3 7 R4Z ICQ r 560 C38 QI S9 AA J R 2V I 1 2 5DOO...

Page 16: ... 502347 502147 512227 512339 502410 502127 33571 502056 33571 502118 502133 502410 502447 502522 214790 522312 33571 502127 502410 502447 502347 Crystal type IN34 A Post binding Connector RF Output Jack Mod In and RF In Jack single contact Connector Inductor adjustable Inductor adjustable Inductor adjustable Inductor adjustable 502447 502410 512333 Symbol No L5 L6 to L9 LIO Lll LSI PI P2 P501 Indu...

Page 17: ...ide Pulley single 34 thick x 2YsM dia Pulley single 6 thick x 3 dia Pulley single 4 thick x YsM dia aluminum Pulley single thick x dia aluminum Scale dial calibrated Shell for rf cable match pair Socket tube 7 pin Socket tube 9 pin Socket pilot lamp Spring coil 0 156 dia x U6M long Spring coil 0 185 dia x I long Stud for carrying handle Window for dial Stock No 214785 214797 73960 35262 211887 212...

Page 18: ...ifier circuits Since any adjustment of the amplifier circuits usually will slightly detune the traps the traps may have to be touched up during the picture if am plifier alignment The manufacturer s alignment in structions will again determine the exact procedure to follow Alignment of Sound If Amplifiers and FM Detectors A typical test set up for aligning an intercarrier type sound if amplifier i...

Page 19: ...the zero reference line Tune the detector transformer as indicated in the manufacturer s service notes If the detector is not correctly aligned the 600 cps will modulate the S curve as shown in Figure 12 When the detector is set to exactly 4 5 Mc the modula tion will be cancelled out Use of WR 99A as Heterodyne Frequency Meter The WR 99A may be used with good accuracy to de termine the frequency o...

Page 20: ...should be used to locate trouble p rRONT PANtl OJ Circuit Desceiption and Operation The WR 99A is built around a Colpitts type variable frequency oscillator VI which utilizes an RCA 6AF4 A See Figure 13 This oscillator is tunable by means of capacitor sections CIA CIB CIC and CID over a band of frequencies from 20 to 260 Mc This band is divided into eight overlapping rf ranges On ranges 1 through ...

Page 21: ...A to OFF Set the CAL MOD control to 10 MC CAL Turn the AF GAIN control about three quarters turn clockwise Set the standard oscillator to deliver a 10 Mc output signal 3 With an insulated alignment tool turn the slug in inductor L9 until about one quarter inch protrudes from the coil form See Figure 14 for locations of in ternal adjustments 4 Screw the core slowly back into the coil form and liste...

Page 22: ...L NEAATOA Ar Ar Ar OUT OUT 9 OUT T CRO WAAKEA 0 ADDEA 9 VCAT I Figure 17 r st selup for vfo tracking adiustments 4 Adjust trimmer capacitor C41 to obtain as close zero beat as possible VFO Tracking Adjustments NOTE All vio adjustments must be made in the order listed Band 7 Adjustments Alignment of the variable frequency oscillator requires in addition to the WR 99A a sweep generator such as the R...

Page 23: ...o approximately one half CENTER SCALE IN WINDOW ND SET SWITCH IN 1ooIAX CLOCK WiSt POSITION ND STRING AS SHOWN Rr RANGE capacity and adjust the core of Ll until a beat appears on the oscilloscope trace 3 Tune the standard generator and the WR 99A to 28 Mc Adjust C48 for zero beat of the two signals 4 Repeat the low and high end adjustments until both the 20 and 28 Mc points track perfectly 5 Reduc...

Page 24: ...ssary to service this equipment the report forms enclosed in this booklet should be filled out as described It is important that 1 Test equipment be packed carefully 2 A full description of the trouble be included in the report 3 All probes cables and test leads used with the equipment be included in the shipment Attention to these details will help prevent damage in transit and delay in repairs ...

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