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Table of Contents
Summary of Contents for Panoramic Panadaptor PCA-2
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Page 3: Table Of Contents
Visible Panoramic ............Audible Panoramic ........ - Page 4 ..........Power Supply and Panoramic Indicator Circuit .
- Page 5 · · Typical Panoramic Picture of a 200KC Port ion of a Band ......Determination. of Signal Frequency at Maximum Sweepwidth ..... .
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Page 9: Cables
VISIBLE - AUDIBLE PANORAMIC. This combined operation of Visible Panoramic and Aud ible Panoramic is available when the audio output �I of the PCA-2 is fed to high impedance headphones (crystal type) or to an external audio amplifier. f. VISIBLE-AUDIBLE SINGLE-SIGNAL. -
Page 10: Service Controls. (Rear Chassis Apron)
The PANADAPTOR has been packed to with In about half a minute the baseline trace should stand normal abuse in transit. It is recommended appear on the Panoramic screen. that, upon receipt, the carton and If it does not, observe whether the tubes... -
Page 11: Location
6SA7 a shield. 6SB7 The Panoramic indicator tube is turned a quarter turn, in the same direction, by rotating the tube socket at the rear of the bracket. 12SA7 Turn on the equipment to check whether the baseline *Looking at the bottom of the socket or .. -
Page 14: Determination. Of Signal Frequency At Maximum Sweepwidth
V s along the � aselme on ADAPTOR do not match. (See Align ment Procedure, Section V). the Panoramic screen. If they do not, It may be necessary to turn up the PANADAPTOR GAIN. In performing this adjustment and for general... -
Page 15: Contrast Of An Unmodulated Carrier With An Am Signal
Obviously, the signals appe:.uing on the (-) side modulation causes the height of the "pip" to vary of the zero mark are lower in frequency than the irregularly. station heard. At slightly reduced sweepwidth, a constant tone modulation of low frequency will produce a series Note of convolutions along the sides of the deflection. -
Page 16: J 9. Typical Patterns Of Single Sid� Band And Fm Signals
Single Side Band Signal Frequency Modulated Signal at Reduced Sweepwith Figure 9. Typi cal Patterns of Single Side Band and FM Signals KILOCYCLES KILOCYCLES MCW Signal C W Signal at Reduced Sweepwith Figure J O. Comparison of CW and MCW Signals ( 6) A CW si g nal "pip"... -
Page 19: Audible Panoramic
The location of the . signal in the band is shown I M PORTANT on the Panoramic screen and the signal can be tuned The CENTER FREQ. knob is factory set in quickly by turning the receiver tuning dial so for proper zero position. -
Page 20: Reception With The Panadaptor ( Pa.1Oramic Method)
CHRONOUS NOISE. Signals which normally can receiver is tuned in the direction of the station until the audio output of the receiver and PANADAP not be heard because of synchronous noise inter ference may be seen on the Panoramic screen. TOR match. -
Page 22: Selecting Qrm Free Spots
CHOOSING A CLEAR SPOT FOR TRANS As a net station appears on the screen, the receiver MI TT ING.-By operating the PANADAPTOR on is tuned to the station by the Panoramic Method. Visible Pa noramic it is possible to observe the screen The screen is continuously observed for possible for a clear spot and to determine its frequency. -
Page 24: Measuring Percentage Modulation (Am)
Vari_ a tion of Height of Modulation Before measurement can be made, it is necessary Pattern Against Modulating Frequency to calibrate the Panoramic screen, in terms of per " cent of modulation, aga inst a source of amplitude 500 c.p.s. from the carrier are attenuated modulated R. -
Page 25: Spotting Spurious Supersonics And R. F. Para�Itics
strong that when added to normal audio modulation, overmodulation with resultant interference arises. • The presence of R. F. parasitics in a transmitter will drastically reduce the effective output of the transmitter and will also introduce QRM which is difficult to track down without a PANADAPTOR. The presence of parasitic s and superson ics on a received or transmitte d signal can be detected on the Panorami c screen by the following suggested... -
Page 27: Patterns Of Key Clicks
Patterns of Key Clicks receiving or transmitting end, by observing it on the It will be noted that "pips" which are approxi Panoramic screen. mately 4KC apart tend to merge below their waists. This is normal and the energy distribution is still For voice or music FM signals, the extent of fre... -
Page 28: Presence O F A M On Fm Indicated By A Non-Symmetrical Envelope Pattern
If a broadcast FM station is monitored for a 150KC maximum bandwidth, the SWEEPWIDTH control should be at maximum. The appearance of modulation "pips" outside the 75KC limits on either side of the zero mark on the screen indicates "over modulation."... -
Page 29: Detecting Residual Hum On A Carrier
23. D ETECTING R ES I D UAL H UM ON A CARRI E R. The carrier to be examined is tuned in to the center of the Panoramic screen and the PANA DAPTOR is adjusted for Visible Single-Signal. If the elevated baseline is curved or hooked it indi... -
Page 31: Overall Response Of Panadaptor And Receiver
tuned to approximately 28. 660KC. A 50KC be used in conj unction with the standard. IOKC markers will be presented on t he screen. marker for 28. 650mc appears approximate ly 0 division to the right of the zero mark The Sweepwidth can be reduced for greater spread on the screen. -
Page 32: Converter, Local Oscillator And Reactor
Z 1-12. The oscillator mean frequency is 681KC, the sum of the PANADAPTOR I. F. , 226KC, and the mean input frequency, 455KC. During Panoramic Opera tion the mean frequency is maintained at 681 KC by the CENTER FREQ. Control. -
Page 33: 3. I.f. A M P L I F I E R
The output of the video amplifier is directly coup tage rises, and then snap back with the rapid decay led to the vertical deflector plate of the Panoramic of the sawtooth. Due to the persistence of vision, a indicator so that a flat video response down to zero horizontal baseline is apparent. -
Page 34: Power Supply And Panoramic Indicator Circuit
( 3 ) SCREEN CALIB RATION ERROR. -A Chart. discrepancy of more than 15% exists between signal The Panoramic screen is used as the alignment frequency and screen scale indication of frequency. indicator. Signals should be kept below the satura... - Page 35 Signal Position Alignment of Generator Procedure of Controls Output I. F. Amplifier 226KC unmodulated SWEEPWIDTH at Entire baseline deflects upward. Adjust th e trimmers in the I.F. trans to pin #8 of V2. zero position. CENTER FREQ. formers (Z2-12, Z3-12) for maximum de turned extreme coun...
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Page 37: 3. T R O U B Le S Hootin G Chart
3. T R O U B LE S HOOTIN G CHART. Causes and Cures Causes and Cures 1. No illumination of the 1. AC power is off. Increase SWEEPWIDTH control cathode ray tube, V8. a. See if tubes are lit. to maximum sweep. -
Page 38: Voltage Chart (Voltmeter 1,000 Ohms Per Volt)
4. VOLTAGE CHART. 1 ,000 Voltmeter ohms per volt. 1 15V Line voltage P I N N U M B E R Function Circuit Type S:ymbol - - - - ---- ---- 6SG7 R . F . Amplifier ....6 .6AC 3 1 8 Converter . -
Page 39: Resistance Chart
Circuit Name and Description Symbol Panoramic Input R.F. Bandpass Transformer ..... T 1-12 L 1 1 14 ( T 1-5215) Output R.F.