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SBE SB-36 OPERATION MANUAL SB-36 OPERATION MANUAL Remastered by NoobowSystems Lab. Tomioka, Japan 2003 Rev.00 http://www.noobowsystems.com PRELIMINARY VERSION NoobowSystems Lab. Tomioka, Japan 2003 http://www.noobowsystems.com/ Page 1 / 56...
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SBE SB-36 OPERATION MANUAL WARRANTY Linear Systems, Inc. warrants equipment manufactured by it to be free from defects in material or workmanship and agrees to repair such equipment which under normal use and service, develops defects arising from the fault of the manufacturer. Equipment must...
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SBE SB-36 OPERATION MANUAL TABLE OF CONTENTS Paragraph Page Section I General Description General Specifications 1.2.1 General 1.2.2 Transmitter 1.2.3 Receiver Section II In starvation General Fixed Station Antennas Linear Amplifier Section III Operation Operation Instructions Section IV Operating Procedure...
The SB-36 Transceiver is a single sideband, suppressed carrier, digital read-out transceiver designed for the professional / amateur radio operator. The SB-36 is capable of operation in the SSB and CW modes of operation. Frequency coverage includes all amateur bands between 3.0 and 29.7 MHz.
SBE SB-36 OPERATION MANUAL 1.2 SPECIFICATIONS 1.2.1 General Frequency Range 3.50 - 4.00 MHz 7.00 - 7.50 MHz 14.00 - 14.50 MHz 21.00 - 21.50 MHz 28.00 - 30.00 MHz Frequency Accuracy Nixie tube Read-out, accurate to within +100 Hertz...
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SBE SB-36 OPERATION MANUAL 1.2.3 Receiver Sensitivity 0. 5 microvolts for 10 db S+N/N Selectivity 2.4 kHz @6 db 4.2 kHz @60 db Spurious Response Image and IF responses down at least 50 db Stability 100 Hertz (or less) per 1/z hour under any normal...
2.4 LINEAR AMPLIFIER Any conventional linear amplifier requiring 300 watts of drive or less may be used in conjunction with the SB-36. An external jack on the rear panel provides relay control information to accessory linear amplifiers. Another external jack on the rear of the transceiver will accept ALC NoobowSystems Lab.
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SBE SB-36 OPERATION MANUAL feed-back information from the linear amplifier to control the power output of the transceiver. NoobowSystems Lab. Tomioka, Japan 2003 http://www.noobowsystems.com/ Page 10 / 56...
3.1.1 The front and rear panel controls, connectors and indicators used in operating the SB-36 are shown in Figures 3.1 and 3.2 and are described in Table 3.1. The descriptions given in the table are not intended to be operating instructions, but only a reference to determine the function of each stern.
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SBE SB-36 OPERATION MANUAL Number Nomenclature Description RIT Push- On Switch The receiver incremental (RIT) is activated by depressing the PUSH-ON switch. RIT Lamp Wren the RIT PUSH-ON control is activated, the RIT Lamp will be lit. RIT Control Potentiometer varies the frequency of the VFO Oscillator, +7 kHz in the receive mode.
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SBE SB-36 OPERATION MANUAL Meter Switching The "METER" switch is used to select the desired parameter to be measured. The three functions of the switch are as follows; ALC: When transmitting, place the meter switch in the ALC position. This will help in determining the proper levels of microphone gain and ALC.
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WARNING: Do not change position of the "MHz" band selector when the SB-36 is keyed for transmit condition, as this will result in damage to the equipment, which is not covered by the warranty.
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The potentiometer that varies the attenuation of the speaker audio signal being applied to the ANTI-VOX amplifier circuit input. Its function is to adjust the threshold level of the modulated audio that keeps the SB-36 keyed for a receive condition. Phone Patch A connector which will accept phone patch information to "IN JACK"...
NOTE: If the RIT control is used, the Nixie tube read-out will indicate the exact frequency of the incoming signal. When the SB-36 is placed in the transmit mode, the Nixie tube read-out will revert back to the frequency selected when the RIT control was off.
SBE SB-36 OPERATION MANUAL 4.2.6 Place the MODE switch to the TUNE position. 4.2.7 Place the VOX/REC-PTT/SEND switch to the SEND position. 4.2.8 Advance the MIG Gain Control slightly while tuning the PRESELECT control for maximum indication on the meter.
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SBE SB-36 OPERATION MANUAL 4.3.6 With the key depressed, adjust the CARR potentiometer (located on the rear panel of the unit) so the transmitter power output does not exceed 200 watts on 15 through 80 meters or 150 watts on 10 meters.
5. 1 GENERAL 5.1.1 Figure 5.1 shows the basic transmitter receive signal paths and the printed circuit boards associated with each. The SB-36 Transceiver is comprised of a power amplifier assembly, accessory power supply, and one each of the following circuit boards:...
Stage-by-Stage transmit signal path block diagrams is shown in Figure 5.1. Unless otherwise indicated in the following explanation, it is assumed that the SB-36 is operating in the Single Sideband Mode. Audio signals from the microphone connector or phone patch input jack are routed to TR-l located on the Microphone Amplifier and Side Tone Oscillator Board.
SBE SB-36 OPERATION MANUAL by transistor TR-11. The output of mixer tube V-l is coupled to the grid of V-2, the driver tube. Output of tube V-2 is capacitively coupled to the input of the PA tubes, V-5 and V-6.
TR-7 during the presence of strong RF noise pulses. 5.3.3 Automatic Gain Control Automatic Gain Control (AGC) is employed in the SB-36 Transceiver to maintain a constant receive signal level passing through the front end and IF Amplifier Board. The AGC circuitry can be completely disabled by switching the front panel "AGC"...
SBE SB-36 OPERATION MANUAL AGC circuit is located on the IF amplifier printed circuit board. Its controlling effects can be overridden by setting of the front panel "RF Gain" potentiometer VR-601. The AGC circuit provides two outputs with an increasing RF input signal level. First, the AGC voltage is applied to the control grid of V-4 the RF amplifier tube.
The basic concept of the frequency mixing employed in the SB-36 Transceivers is show in Table 5.1. Table 5.1 shows the relationship of the 9 MHz carrier oscillator, VFO and HFO outputs for the various bands used in the SB-36 Transceiver. TABLE 5.1 SB-36 FREQUENCY CHART Band...
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<Figure 5.43 Block Diagram of Counter Unit > 5.3.5.3 High Frequency Oscillator The SB-36 has seven high frequency crystals used in the HFO oscillator circuitry. The relationship between the transceiver operating frequency and the HFO crystal frequency is shown on Table 5. 2.
SBE SB-36 OPERATION MANUAL 5.3.5.4 Side Tone Oscillator Transistor TR-5 is a phase shift side-tone oscillator which operates when the mode switch is in either the CW or tune position. Frequency with phase shift oscillator is approximately 1000 kHz. The output of TR-5 is fed to the transmitter microphone audio circuit when the mode switch is in the TUNE position to provide a signal which will allow tune-up of the transmitter.
VFO is operating outside of a normal band. Table 5.2 shows the relationship between the various bands in the SB-36 Transceiver and functions of the band edge limit lights. TABLE 5.2 UPPER/LOWER RANGE LIMIT LIGHTS...
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AC power supply chassis. A block diagrams of the power supply circuit is shown in Figure 5.4. Table 5.3 shows pin connections for the power supply interconnect cable on the SB-36 Transceiver and the various voltages and currents required at each pin. TABLE 5.3 POWER SUPPLY REQUIREMENTS...
6.2.3 Cleaning A. Exterior. Loose dust accumulated on the outside cover of the SB-36 Transceiver and Power Supply can be removed with a soft cloth or squall paint brush. A paint brush is particularly useful for dislodging dirt on and around front panel controls.
SBE SB-36 OPERATION MANUAL cotton tipped applicator is useful for cleaning in narrow spaces and circuit boards. The high voltage circuits, particularly located in the PA assembly, should receive special attention. Excessive dirt in these areas may cause high voltage arcing and result in improper operation of the transceiver.
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SBE SB-36 OPERATION MANUAL and various modes. Perform a visual check for damaged wires, electrical and mechanical parts, and printed circuit boards. Check for loose interconnection between printed circuit boards. D. Check individual parts. The following procedure describes the method of checking individual parts.
SBE SB-36 OPERATION MANUAL with a capacitance meter or by checking whether the capacitor passes AC signals. 6.3.2 Voltage Table and Injection Points Table 6.1 contains voltage measurements and injection levels to be used as an aid in isolating a defective stage or component.
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SBE SB-36 OPERATION MANUAL SERVICE MAINTENANCE Should your SB-36 fail to perform as stated in this manual, it is recommended that SBE be contacted in writing. SBE will either authorize return of the unit to the factory or refer you to an authorized SBE repair agency in your area.
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SBE SB-36 OPERATION MANUAL FEP-501: MICROPHONE AMPLIFIER SIDE TONE OSCILLATOR PC BOARD PART NUMBER DESCRIPTION 8000-00010-009 Capacitor, Fixed, Electrolytic, 47µF, 25V 8000-00010-003 Capacitor, Fixed, Ceramic, 330pF, 50V 8000-00010-007 Capacitor, Fixed, Electrolytic, 10µF, 16v 8000-00010-007 Capacitor, Fixed, Electrolytic, 10µF, 16v 8000-00010-007 Capacitor, Fixed, Electrolytic, 10µF, 16v...