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16_BIT_BINARY_DAC

Published:2009-6-26 2:43:00 Author:Jessie

16_BIT_BINARY_DAC
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8_BIT_D_A_WITH_OUTPUT_CURRENT_TO_VOLTAGE_CONVERSION

Published:2009-6-26 2:40:00 Author:Jessie

8_BIT_D_A_WITH_OUTPUT_CURRENT_TO_VOLTAGE_CONVERSION
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±10_V_FULL_SCALE_BIPOLAR_DAC

Published:2009-6-26 2:37:00 Author:Jessie

±10_V_FULL_SCALE_BIPOLAR_DAC
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PRECISION_12_BIT_D_A_CONVERTER

Published:2009-6-26 2:35:00 Author:Jessie

PRECISION_12_BIT_D_A_CONVERTER
PRECISION_12_BIT_D_A_CONVERTER

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NOISE_BRIDGE

Published:2009-6-26 2:31:00 Author:Jessie

NOISE_BRIDGE
NOISE_BRIDGE
NOISE_BRIDGE

Used with communication receiver to measure impedance at antenna terminals or at end of transmission line, as required for adjusting antenna matching and loading devices for desired impedance at specific frequency. Consists of diode.connected transistor broadband,noise generator, 3-stage noise amplifier, and toroid transformer bridge. All transistors are 2N5129 or equivalent 2N5137 or 2N5220. Try different transistors until highest noise output is obtained. Toroid core for trans.former is 3/8-inch Indiana General CF102. Quadrifilar winding has 4 1/2 turns of four No.28 enamel wires twisted together, wound on core and connected as on diagram. Noise bridge can also serve as wideband noise source for signal injection during troubleshooting in AF or RF circults, and as noise source for aligning RF cir-cuits,-J.J. Schultz, An Improved Antenna Noise Bridge, CQ, Sept, 1976, p 27-29 and 75.   (View)

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LOGARITHMIC_WATTMETER

Published:2009-6-26 2:59:00 Author:May

LOGARITHMIC_WATTMETER
Single meter scale covers 1-1000W, with equally spaced divisions for 1,10,100,and 1000. This log scale makes it possible to measure very low reflected powers and very high forward powers simultaneously with same percentage accuracy. Basis of operation is that voltage dropped across forward-biased 1N40C2 silicon PN junction diode is proportional to logarithm of cur rent through it. For 50-ohm line, use 220 for R2 and 27 for R3 and R4. For 75 ohm Iine, coffesponding values are 180 and 33. Detectordiodes are point-contact germanium rated at 80 PIV. Article gives construction details. Ground coax braid at one end only. Ferrite ring is 0.5-inch Mullard FX1596 or equivalent.-P.G.Martin, Some Directional Wattmeters and a Novel SWR Meter, 73Magazine,Aug.1974,p 17,19-21,23-24,and 26.   (View)

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HIGH_SPEED_VOLTAGE_OUTPUT_DAC

Published:2009-6-26 2:57:00 Author:May

HIGH_SPEED_VOLTAGE_OUTPUT_DAC
HIGH_SPEED_VOLTAGE_OUTPUT_DAC

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±10_V_FULL_SCALE_UNIPOLAR_DAC

Published:2009-6-26 2:51:00 Author:May

±10_V_FULL_SCALE_UNIPOLAR_DAC
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16_BIT_BINARY_DAC

Published:2009-6-26 2:43:00 Author:May

16_BIT_BINARY_DAC
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8_BIT_D_A_WITH_OUTPUT_CURRENT_TO_VOLTAGE_CONVERSION

Published:2009-6-26 2:40:00 Author:May

8_BIT_D_A_WITH_OUTPUT_CURRENT_TO_VOLTAGE_CONVERSION
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±10_V_FULL_SCALE_BIPOLAR_DAC

Published:2009-6-26 2:37:00 Author:May

±10_V_FULL_SCALE_BIPOLAR_DAC
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PRECISION_12_BIT_D_A_CONVERTER

Published:2009-6-26 2:35:00 Author:May

PRECISION_12_BIT_D_A_CONVERTER
PRECISION_12_BIT_D_A_CONVERTER

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NOISE_BRIDGE

Published:2009-6-26 2:31:00 Author:May

NOISE_BRIDGE
NOISE_BRIDGE
NOISE_BRIDGE

Used with communication receiver to measure impedance at antenna terminals or at end of transmission line, as required for adjusting antenna matching and loading devices for desired impedance at specific frequency. Consists of diode.connected transistor broadband,noise generator, 3-stage noise amplifier, and toroid transformer bridge. All transistors are 2N5129 or equivalent 2N5137 or 2N5220. Try different transistors until highest noise output is obtained. Toroid core for trans.former is 3/8-inch Indiana General CF102. Quadrifilar winding has 4 1/2 turns of four No.28 enamel wires twisted together, wound on core and connected as on diagram. Noise bridge can also serve as wideband noise source for signal injection during troubleshooting in AF or RF circults, and as noise source for aligning RF cir-cuits,-J.J. Schultz, An Improved Antenna Noise Bridge, CQ, Sept, 1976, p 27-29 and 75.   (View)

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CAPACITIVE_ANTENNA

Published:2009-6-26 2:31:00 Author:May

CAPACITIVE_ANTENNA
Cornbination of short whip antenna and broadband amplifier gives antenna covering entire range of 3 to 30 MHz without frequency selectivity. at is 2N3819 FET source follower driving three-transistor amplifier using 2N918, 2N6008, or other 200-MHz 20V NPN transistors to provide 30-dB gain. Circuit rolloff starts at 3 and 35 MHz. High gain of am plifier makes combination simulate quarter-wave whip over entire frequency range.-R. C.Wilson, The Incredible 18 All-Band Antenna, 73 Magazine, March 1975, p 49-50.   (View)

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160_METER_PREAMP_WITH_FERRITE_LOOP

Published:2009-6-26 2:30:00 Author:May

160_METER_PREAMP_WITH_FERRITE_LOOP
Ferrite-rod antenna is combined with 16-inch wire rod to give cardioid radiation pattern for low-noise 160-meter antenna system. Preamp using MPF102 FETs has gain of 25 dB. L1 is 48 turns No.14 enamel spread to 4.5 inches on 0.5 inch Amidon ferrite rod 7 inches long. L2 is 6-turn link wound over center of L1.L4 and L5 are each 50 turns No.26 enamel on 780-2 powdered-iron toroid cores, with 6 turns for links L3 and L6.-D. DeMaw, Low-Noise Receiving An-tennas, QST, Dee.1977, p 36-39.   (View)

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10_BIT,4_QUADRANT_MULTIPLEXING_D_A_CONVERTER(OFFSET_BINARY_CODING)

Published:2009-6-26 2:29:00 Author:May

10_BIT,4_QUADRANT_MULTIPLEXING_D_A_CONVERTER(OFFSET_BINARY_CODING)
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BEAM_SPLITTER_FOR_OSCILLOSCOPE

Published:2009-6-26 2:27:00 Author:May

BEAM_SPLITTER_FOR_OSCILLOSCOPE
The basis of the beam splitter is a 555 timer connected as an astable multivibrator.Signals at the two inputs are alternately displayed on the oscilloscope with a clear separation between them. The output is controlled by the tandem potentiometer RV1a/b which also varies the amplitude of the traces.   (View)

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OSCILLOSCOPE_MONITOR

Published:2009-6-26 2:26:00 Author:May

OSCILLOSCOPE_MONITOR
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FOUR_POSITION_MOTOR_SWITCH

Published:2009-6-26 2:25:00 Author:May

FOUR_POSITION_MOTOR_SWITCH
Single RF feed line also carries DC for 3-V permanent magnet DC motor B1 atop antenna tower, driving S3 and S4 for remote switching to antennas a, b, c, and d. Diagram shows switches set for feed to antenna a, with no drive applied to Bt since cam C has opened microswitch S5. CR5 and CR6 are now connected in series with opposite polarity, so neither positive nor negative halfwaves from 12-VAC supply can drive motor. If S2 is closed, poshive halfwaves start B1. Once started, motor runs until cam opens S5; if S2 has not yet been released, motor continues running on positive and negative halfwaves. Diode bridge CR1-CR4 makes motor rotate in only one direction for either drive polarity. If S2 is released, before S5 opens, motor stops. 6-V 1-A lamp DS1 comes on dimly when S2 is closed and brightens when S5 closes. If S2 is released now, B1 drives to next position and stops. If S2 is held down, switching continues. Meter M1 and CR7 identify position of switch. R1-R4 in range of 1K to 10K, are chosen to give 1/4, 1/2, 3/4, and full deflection of meter. Motor drives switch through 2860:1 reduction gears taken from alarm clock. All diodes are 50-PIV 1-A silicon such as 1N4001.-U.H.Lammers, A Remote Antenna Switch, QST,Aug.1974, p 41-43.   (View)

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TRANSMITTER_OSCILLOSCOPE_COUPLER_FOR_CB_SIGNALS

Published:2009-6-26 2:24:00 Author:May

TRANSMITTER_OSCILLOSCOPE_COUPLER_FOR_CB_SIGNALS
To display an rf signal, connect L1 to the transmitter and points A and B to the vertical plates of the oscilloscope. Adjust L1 for minimum SWR and C3 for the desired trace height on the CRT. L2 = 4 turns #18 on 3/4 slug tuned rf coil form, L1 = 3 turns #22 adjacent to grounded end of L1, C1, and C2 = 5 pF, C3 = 75 pF trimmer.   (View)

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