Summary of Contents for Conar 280
- Page 1 Price $1.00 Operating and Maintenance Instructions for the CONAR Signal Generator Model 280 QUALITY EQUIPMENT BUILT ON A HALF CENTURY OF SERVICE IN ELECTRONICS...
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Page 2: Specifications
CONAR Model 280 Signal Generator Operating and Maintenance Instructions SPECIFICATIONS Accuracy: Better than 3% after calibration. Attenuator: Course: High-Low switch. Fine: Continuously variable potentiometer. Output Cable: Permanently attached, low loss coaxial, terminated in alligator clips. Output Amplitude: RF and Modulated RF continuously variable within six bands. -
Page 3: Description Of Controls
Operating Instructions: control clockwise from the OFF position, you will The CONAR Model 280 Signal Generator is easy to hear a slight click. This turns the instrument ON. As operate. The front panel labels for the controls and the control is turned further clockwise, the signal scales enable you to set up the instrument for the generator output increases. -
Page 5: Circuit Description
We know this line is 1500 kc because It is halfway between 1400 and 1600. The short graduations The circuit of the Model 280 is shown in Fig. 1. The between 1400 and 1500 mark off five spaces. Each Hartley type oscillator circuit was selected for its space must represent 20 kc because the five spaces stability. - Page 6 You can use any one of several methods to indicate the response of the Your CONAR Signal Generator can be used for tuned circuit to the applied signal. The simplest testing and aligning AM and FM radio receivers. The...
- Page 7 If a circuit you are aligning breaks into Warm-up Time: oscillation, your indicating meter will show a high The oscillator of your CONAR Signal Generator is a false reading. It will be necessary to find and correct stable circuit that will show no appreciable frequency the cause of oscillation (usually feedback) before you drift during warm-up.
- Page 9 receiver will be a transistor set because most modern reasonably well and maximum sensitivity will be tube broadcast receivers do not have a padder. In the obtained over the entire tuning range. following discussion, the word "padder" refers to the padder capacitor or the tuning slug in the oscillator STEP BY STEP ALIGNMENT OF coil.
- Page 11 If it does not, adjust the dial pointer so it lines up with signal generators. Your Model 280 Signal Generator the calibration mark. has a low impedance output that will provide adequate signal for testing at any point in the 11.
- Page 12 FM RADIO RECEIVER ALIGNMENT modulation. You are now ready to make alignment adjustments. Your Model 280 Signal Generator can be used to align the IF section and the detector section of FM Adjust the slugs in the IF coils for maximum Receivers.
- Page 13 Turn the receiver volume up full and set the receiver receiver or attach six or more feet of hookup wire to dial to a point where you do not hear any interfering the antenna terminal to act as an antenna. Connect the signals.
- Page 14 coil. You will find a tuning wand to be a great time Signal Generator is now set up to produce modulated saver in making these adjustments. A tuning wand RF signals in the broadcast band. Clip or lay the consist of a plastic rod with a small amount of output cable near a radio receiver.
- Page 16 132 VDC *3 VAC 6.8 VDC 6.4 VAC 6.4 VAC 60 VDC -7.4 VDC 1.8 VDC TABLE 1: Voltage Chart for Signal Generator Model 280 Power Supply Input Positive The above voltage readings were taken with Rectifier Terminal Terminal respect to the chassis using a VTVM and with...
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Page 17: In Case Of Trouble
If you cannot locate the trouble yourself, you may considered quite satisfactory. Your CONAR Signal use our free CONAR consultation service. Write us a Generator will probably fall well within this accuracy letter describing in detail the trouble you are without alignment. - Page 18 band selector to B. Rotate the signal generator dial to example, suppose your signal generator reads 1020 kc the same frequency as the received radio station. You when you zero beat it with a station broadcasting cn should hear a high pitched audio signal that decreases exactly 1000 kc.
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Page 19: Corrective Maintenance
CORRECTIVE MAINTENANCE If your instrument does not operate after replacing a Your CONAR Signal Generator is constructed of defective tube, check the circuitry around that tube. A quality parts and the instrument will ordinarily give shorted tube may have caused excessive current to years of trouble-free service before any maintenance flow through a resistor. - Page 23 NOTES:...
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