• Single-Layer Wound Coil Chart

    Geplaatst op door colani Reactie
      The chart on th opposite page provides a convenient
    means of determining the unknown factors of small sized
    single-layer wound r-f coils.  Values thus found so cosely
    approximate those determined by measurement or
    mathematical calculation as to be entirely satisfactory
    for all practical purposes of experimentation, design,
    and repair work.  Since in all coils of this type, the
    difference between the mean and inner diameter of the
    winding is so slight as to be negigible, D in all instances
    may be either the mean or inner diameter as desired.
    Example:  Given the total number of turns, winding
    length and diameter of a coil, — to find the inductance:
    1.  Place a straightedge on the chart so as to form
    a line intersecting the number of turns N, and the
    ratio of diameter to length K, and note the point
    intersected on the linear axis column.    		   2.  Now move the straightedge so as to form a second line
    which will intersect this same point on the axis column,
    and the diameter D.
    3.  The point where this line intersects the L column indicates
    the inductance of the coil in microhenries.

    Example:  Given the diameter, winding length and inductance
    in microhenries, — to find the number of turns;
    1.  Simply reverse the process outlined above for determining
    inductance.
    2.  After finding the number of turns, consult the wire table on
    page 35 and determine the size of the wire to be used.

    The dotted lines appearing on the chart illustrate the correct
    ploting of a 600 microhenry coil consisting of 100 turns of wire
    wound to 51/64″ on a form 2″ in diameter.

    Inductance, Capacitance, Reactance Charts

      The direct-reading charts appearing on the following three
    pages are designed for determining unknown values of
    frequency, inductance, capacitance and reactance components
    operating in a-f and r-f circuits.
    The simplifications embodied in these charts make them
    extremely useful.  The frequency range covered comprises
    the frequency spectrum from 1 cycle per second up to 1000
    megacycles per second.  All of the scales involved are plotted
    in actual magnitudes so that no computations are required to
    determine the location of the decimal point in the final result.
    To make these conditions possible the frequency spectrum
    has been divided into three parts:
    Chart I (page 38)–Covers the range from 1 cycle to 1000
    cycles.
    Chart II (page 39)–From 1 kilocycle to 1000 kilocycles.
    Chart III (page 40)–From 1 megacycle to 1000 megacycles.
    Inductance, capacitance, reactance and frequency have been
    plotted so that the reactance offered by an inductance at any
    frequency may be readily determined by placing a straight-edge
    across the chart connecting the know quantities.
    Since XL = XC at resonance in most radio circuits, the charts    		 may also be used to find the resonant frequency of any combi-
    nation of L and C.

    To illustrate with a simple example, suppose the reactance
    of a 0.01 uf. capacitor is desired at a frequency of 400 cycles.
    Place a straight-edge across the proper chart so as to connect
    the points 0.01 uf. and 400 cycles per sec.  The quantity
    desired is the point of intersection with the reactance scale
    which is 40,000 ohms.  The straight-edge also intersects the
    inductance scale at 15.8 henrys indicating that this value of
    inductance likewise has a reactance of 40,000 ohms at 400
    cycles per sec. and furthermore, that these values of L and C
    produce resonance at this frequency.

    There are many practical uses for these charts.  The radio
    experimentor, maintenance man and engineer will find them
    helpful in the rapid solution of many reactance problems.
    Unusual care was exercised in laying out the various scales
    in order to secure a high degree of accuracy for the charts.
    Results should be obatinable which are at least as accurate
    as might be secured with a ten-inch slide rule.

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  • Table of Standard Annealed Bare Copper Wire Using American Wire Gauge (B&S)

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    GAUGE DIAMETER INCHES AREA WEIGHT LENGTH RESISTANCE AT 68° F CURRENT CAPACITY
    (AWG) or (B&S) Min. Nom. Max. Circular Mils Pounds per M’ Feet per Lb. Ohms per M’ Feet per Ohm Ohms per Lb. (Amps) Rubber Insulated
    0000 .4554 .4600 .4646 211600. 640.5 1.561 .04901 20400. .00007652 225
    000 .4055 .4096 .4137 167800. 507.9 1.968 .06180 16180. .0001217 175
    00 .3612 .3648 .3684 133100. 402.8 2.482 .07793 12830. .0001935 150
    0 .3217 .3249 .3281 105500. 319.5 3.130 .09827 10180. .0003076 125
    1 .2864 .2893 .2922 83690. 253.3 3.947 .1239 8070. .0004891 100
    2 .2550 .2576 .2602 66370. 200.9 4.977 .1563 6400. .0007778 90
    3 .2271 .2294 .2317 52640. 159.3 6.276 .1970 5075. .001237 80
    4 .2023 .2043 .2063 41740. 126.4 7.914 .2485 4025. .001966 70
    5 .1801 .1819 .1837 33100. 100.2 9.980 .3133 3192 .003127 55
    6 .1604 .1620 .1636 26250. 79.46 12.58 .3951 2531. .004972 50
    7 .1429 .1443 .1457 20820. 63.02 15.87 .4982 2007. .007905 –
    8 .1272 .1285 .1298 16510. 49.98 20.01 .6282 1592. .01257 35
    9 .1133 .1144 .1155 13090. 39.63 25.23 .7921 1262. .01999 –
    10 .1009 .1019 .1029 10380. 31.43 31.82 .9989 1001. .03178 25
    11 .08983 .09074 .09165 8234. 24.92 40.12 1.260 794. .05063 –
    12 .08000 .08081 .08162 6530. 19.77 50.59 1.588 629.6 .08035 20
    13 .07124 .07196 .07268 5178. 15.68 63.80 2.003 499.3 .1278 –
    14 .06344 .06408 .06472 4107. 12.43 80.44 2.525 396.0 .2032 15
    15 .05650 .05707 .05764 3257. 9.858 101.4 3.184 314.0 .3230 –
    16 .05031 .05082 .05133 2583. 7.818 127.9 4.016 249.0 .5136 6
    17 .04481 .04526 .04571 2048. 6.200 161.3 5.064 197.5 .8167 –
    18 .03990 .04030 .04070 1624. 4.917 203.4 6.385 156.5 1.299 3
    19 .03553 .03589 .03625 1288. 3.899 256.5 8.051 124.2 2.065 –
    20 .03164 .03196 .03228 1022. 3.092 323.4 10.15 98.5 3.283 –
    21 .02818 .02846 .02874 810.1 2.452 407.8 12.80 78.11 5.221 –
    22 .02510 .02535 .02560 642.4 1.945 514.2 16.14 61.96 8.301 –
    23 .02234 .02257 .02280 509.5 1.542 648.4 20.36 49.13 13.20 –
    24 .01990 .02010 .02030 404.0 1.223 817.7 25.67 38.96 20.99 –
    25 .01770 .01790 .01810 320.4 .9699 1031. 32.37 30.90 33.37 –
    26 .01578 .01594 .01610 254.1 .7692 1300. 40.81 24.50 53.06 –
    27 .01406 .01420 .01434 201.5 .6100 1639. 51.47 19.43 84.37 –
    28 .01251 .01264 .01277 159.8 .4837 2067. 64.90 15.41 134.2 –
    29 .01115 .01126 .01137 126.7 .3836 2607. 81.83 12.22 213.3 –
    30 .00993 .01003 .01013 100.5 .3042 3287. 103.2 9.691 339.2 –
    31 .008828 .008928 .009028 79.7 .2413 4145. 130.1 7.685 539.3 –
    32 .007850 .007950 .008050 63.21 .1913 5227. 164.1 6.095 857.6 –
    33 .006980 .007080 .007180 50.13 .1517 6591. 206.9 4.833 1364. –
    34 .006205 .006305 .006405 39.75 .1203 8310. 260.9 3.833 2168. –
    35 .005515 .005615 .005715 31.52 .09542 10480. 329.0 3.040 3448. –
    36 .004900 .005000 .005100 25.00 .07568 13210. 414.8 2.411 5482. –
    37 .004353 .004453 .004553 19.83 .06001 16660. 523.1 1.912 8717. –
    38 .003865 .003965 .004065 15.72 .04759 21010. 659.6 1.516 13860. –
    39 .003431 .003531 .003631 12.47 .03774 26500. 831.8 1.202 22040. –
    40 .003045 .003145 .003245 9.888 .02993 33410. 1049. 0.9534 35040. –
    41 .00270 .00280 .00290 7.8400 .02373 42140. 1323. .7559 55750. –
    42 .00239 .00249 .00259 6.2001 .01877 53270. 1673. .5977 89120. –
    43 .00212 .00222 .00232 4.9284 .01492 67020. 2104. .4753 141000. –
    44 .00187 .00197 .00207 3.8809 .01175 85100. 2672. .3743 227380. –
    45 .00166 .00176 .00186 3.0976 .00938 106600. 3348. .2987 356890. –
    46 .00147 .00157 .00167 2.4649 .00746 134040. 4207. .2377 563900. –
    *Note: Values from National Electrical Code.
    Note: per M’ means Per 1000 ft.

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  • Coil Winding Data

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    Turns Per Inch Coil Winding Formulas
    Gauge (AWG) or (B&S) Number Of Turns per Linear Inch The following approximations for winding r-f coils are accurate to within approx. 1% for nearly all small air-core coils, where
    Enamel S.S.C. D.S.C. and S.C.C. D.C.C.
    1 – – 3.3 3.3 L = self inductance in microhenrys
    N = total number of turns
    r = mean radius in inches
    l= length of coil in inches
    b = depth of coil in inches.
    2 – – 3.8 3.6
    3 – – 4.2 4.0
    4 – – 4.7 4.5
    5 – – 5.2 5.0 single-Layer Wound Coils
    6 – – 5.9 5.6
    7 – – 6.5 6.2
    8 7.6 – 7.4 7.1
    9 8.6 – 8.2 7.8
    10 9.6 – 9.3 8.9
    11 10.7 – 10.3 9.8
    12 12.0 – 11.5 10.9
    13 13.5 – 12.8 12.0
    14 15.0 – 14.2 13.8
    15 16.8 – 15.8 14.7
    16 18.9 18.9 17.9 16.4
    17 21.2 21.2 19.9 18.1 Multi-Layer Wound Coils
    18 23.6 23.6 22.0 19.8
    19 26.4 26.4 24.4 21.8
    20 29.4 29.4 27.0 23.8
    21 33.1 32.7 29.8 26.0
    22 37.0 36.5 34.1 30.0
    23 41.3 40.6 37.6 31.6
    24 46.3 45.3 41.5 35.6
    25 51.7 50.4 45.6 38.6
    26 58.0 55.6 50.2 41.8
    27 64.9 61.5 55.0 45.0
    28 72.7 68.6 60.2 48.5
    29 81.6 74.8 65.4 51.8 Spiral Wound Coils
    30 90.5 83.3 71.5 55.5
    31 101. 92.0 77.5 59.2
    32 113. 101. 83.6 62.6
    33 127. 110. 90.3 66.3
    34 143. 120. 97.0 70.0
    35 158. 132. 104. 73.5
    36 175. 143. 111. 77.0

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  • Ohm’s Law for A-C Circuits

    Geplaatst op door colani Reactie
    The fundamental Ohm’s law formulas for
    a-c circuits are given by:
    I = E / Z Z = E / I
    E = I*Z P = E*I*cos Ø
    Where: I = current in amperes,
    Z = impedance in Ohms,
    E = volts across,
    P = power in watts,
    Ø = phase angle in degrees.
    Phase Angle
    The phase angle is defined as the difference
    in degrees by which current leads voltage in a
    capacitive circuit, or lags voltage in an inductive
    circuit, and in series circuits is equal to the
    angle whose tangent is given by the ratio X/R and
    is expressed by:
    arc tan (X/R)
    Where:
    X = the inductive or capacitive reactance in ohms,
    R = the non-reactive resistance in ohms,
    of the combined resistive and reactive components
    of the circuit under consideration.
    Therefore:
    in a purely resistive circuit, Ø = 0°
    in a purely reactive circuit, Ø = 90°
    and in a resonant. circuit, Ø = 0°
    also when:
    Ø = 0°, cos Ø = l and P = E*I,
    Ø = 90°, cos Ø = 0 and P = 0.
    ————–
    Degrees x 0.0175 = radians.
    1 radian = 57.3°
    Power Factor
    The power-factor of any a-c circuit is equal to
    the true power in watts divided by the apparent
    power in volt-amperes which is equal to the
    cosine of the phase angle, and is expressed by
    E*I*cos Ø
    p . f . = —————- = cos Ø
    E*I
    Where:
    p.f. = the circuit load power factor,
    E*I*cos Ø = the true power in watts,
    E*I* = the apparent power in voltamperes,
    E = the applied potential in volts
    I = load current in amperes.
    Therefore:
    in a purely resistive circuit.
    Ø = 0° and p.f. = 1
    and in a reactive circuit,
    Ø = 90° and p.f. = 0
    and in a resonant circuit,
    Ø = 0° and p.f. = 1
    Ohm’s Law for D-C Circuits
    The fundamental Ohm’s law formulas for
    d-c circuits are given by,
    E



    R    		 E



    I
    E = I*R P = I*E
    where:
    I = current in Amperes,
    R = resistance in ohms,
    E = potential across R in volts,
    P = power in watts.

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  • D-C Meter Formulas

    Geplaatst op door colani Reactie
    Meter Resistance
    The d-c resistance of a milliameter or
    voltmeter movement may be determined as
    follows:
    1. Connect the meter in series with a
    suitable battery and variable resist-
    ance R1 as shown in the diagram above.
    2. Vary R1 until a full scale reading is
    obtained.
    3. Connect another variable resistor R1
    across the meter and vary its value
    until a half scale reading is obtained.
    4. Disconnect R2 from the circuit and
    measure its d-c resistance.
    The meter resistance RM is equal to the
    measured resistance of R2.
    Caution: Be sure that R1 has sufficient
    resistance to prevent an off scale reading
    of the meter.  The correct value depends
    upon the sensitivity of meter, and voltage
    of the battery.  The following formula can
    be used if the full scale current of the meter
    is known:
    R1 = voltage of the battery used
    full scale current of meter in amperes
    For safe results, use twice the value com-
    puted.  Also, never attempt to measure the
    resistance of a meter with an ohmeter.  To
    do so would in all proability result in a
    burned-out or severly damaged meter,
    since the current required for the operation
    of some ohmeters and bridges is far in
    excess of the full scale current required by
    the movement of the average meter you
    may be checking.
    Ohms per Volt Rating of a Voltmeter
    Where: = ohms per volt,
    Ifs = full scale current in amperes.
    R = shunt value in ohms,
    N = the new full scale reading divided
    by the original full scale reading,
    both being stated in the same units,
    RM = meter resistance in ohms
    Multi-Range Shunts
    R1 = intermediate or tapped shunt value
    in ohms,
    R1+2 = total resistance required for the low-
    est scale reading wanted,
    RM = meter resistance in ohms,
    N = the new full scale reading divided
    by the original full scale reading,
    both being stated in the same units,
    Voltage Multipliers
    R = multiplier resistance in ohms,
    Efs = full scale reading required in volts,
    Ifs = full scale current of meter in am-
    peres,
    RM = meter resistance in ohms
    Measuring Resistance
    with Milliammeter and battery*
    RX = unknown resistance in ohms,
    RM = meter resistance in ohms, or effec-
    tive meter resistance if a shunted
    range is used,
    I1 = current reading with switch open,
    I2 = current reading with switch closed,
    RL = current limiting resistor of suffi-
    cient value to keep meter reading
    on scale when switch is open
    *Approximately true only when current limiting
    resistor is large as compared to meter resistance.
    FULL SCALE
    CURRENT    		 SHUNT
    RESISTANCE
    0-10   ma
    0-50   ma
    0-100 ma
    0-500 ma    		 3.0       ohms
    0.551   ohms
    0.272   ohms
    0.0541 ohms
    Measuring Resistance–(Continued)
    with Milliammeter, Battery and Known Resistor
    RX = unkown resistance in ohms,
    RY = kown resistance in ohms,
    RM = meter resistance in ohms,
    I1 = current reading with switch closed,
    I2 = current reading with switch open,
    with voltmeter and Battery
    RX = unkown resistance in ohms,
    RM = meter resistance in ohms, including
    multiplier resistance if a multiplied
    range is used,
    E1 = voltmeter reading with switch closed,
    E2 = voltmeter reading with switch open,
    FULL SCALE
    VOLTAGE    		 MULTIPLIER
    RESISTANCE
    0-10      volts
    0-50      volts
    0-100    volts
    0-250    volts
    0-500    volts
    0-1,000 volts    		       10,000 ohms
    50,000 ohms
    100,000 ohms
    250,000 ohms
    500,000 ohms
    1,000,000 ohms

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  • Common-Emitter Amplifier Circuits

    Geplaatst op door colani Reactie

    Using Transistors Only

    In comparing the PNP and NPN circuits this interchange in the transistor, circuits
    shown here, note that the current flow in
    the components of one is completely re-
    versed in the other.  With the vacuum tube,
    this complete interchange of current and
    voltage polarities does not exist.  Because of     		which have no parallel in vacuum-tube
    circuitry can be produced.  Nevertheless,
    the circuits of transistorized equipment are
    still auite similar in many respects to those
    of equipment employing vacuum tubes.
    Using PNP Transistors
    With Positive
    Battery Terminal Grounded    		 With Negative
    Battery Terminal Grounded
    Using NPN Transistors
    With Positive
    Battery Terminal Grounded    		 With Negative
    Battery Terminal Grounded

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  • Transistor Amplifier Circuit Configurations

    Geplaatst op door colani Reactie

    With Vacuum & Tube Counterparts

    The transistors of primary interest to the exclusively for most amplification purposes
    radio engineer and service technician are
    the PNP and NPN Junction types, whose
    transistor actions are identically alike, ex-
    cept that symbolically, the emitter arrow
    points towards the base in the PNP and
    away from the base in the NPN.  The
    common-emitter circuits are used almost     		as are the common or grounded-cathode
    vacuum tube circuits.  The common-base
    and common-grid as well as common-
    collector common-plate circuits are used
    more for special applications such as
    impedance matching to and from audio
    transmission lines, etc.
    PNP CONTIGURATIONS NPN CONTIGURATIONS VACUUM-TUBE CONTIGURATIONS
    Common emitter–Common cathode.
    Common base–Common grid.
    Common collector–Common plate.

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  • Transistor Alpha-Beta Relationships

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    Beta

    		 ALPHA
    1 0.5000
    2 0.6666
    3 0.7500
    4 0.8000
    5 0.8333
    6 0.8571
    7 0.8750
    8 0.8889
    9 0.9000
    10 0.9091
    11 0.9167
    12 0.9231
    13 0.9286
    14 0.9333
    15 0.9375
    16 0.9412
    17 0.9444
    18 0.9474
    19 0.9500
    20 0.9524
    21 0.9545
    22 0.9565
    23 0.9583
    24 0.9600
    25 0.9615
    26 0.9630
    27 0.9643
    28 0.9655
    29 0.9667
    30 0.9677
    31 0.9688
    32 0.9697
    33 0.9706
    34 0.9714
    35 0.9722
    36 0.9730
    37 0.9737
    38 0.9744
    39 0.9750
    40 0.9756
    Beta

    		 ALPHA
    41 0.9762
    42 0.9767
    43 0.9773
    44 0.9778
    45 0.9783
    46 0.9787
    47 0.9792
    48 0.9796
    49 0.9800
    50 0.9804
    51 0.9808
    52 0.9811
    53 0.9815
    54 0.9818
    55 0.9821
    56 0.9825
    57 0.9828
    58 0.9831
    59 0.9833
    60 0.9836
    61 0.9839
    62 0.9841
    63 0.9844
    64 0.9846
    65 0.9848
    66 0.9851
    67 0.9853
    68 0.9855
    69 0.9857
    70 0.9859
    71 0.9861
    72 0.9863
    73 0.9865
    74 0.9867
    75 0.9868
    76 0.9870
    77 0.9872
    78 0.9873
    79 0.9875
    80 0.9877
    Beta

    		 ALPHA
    81 0.9878
    82 0.9880
    83 0.9881
    84 0.9882
    85 0.9884
    86 0.9885
    87 0.9886
    88 0.9888
    89 0.9889
    90 0.9890
    91 0.9891
    92 0.9892
    93 0.9894
    94 0.9895
    95 0.9896
    96 0.9897
    97 0.9898
    98 0.9899
    99 0.9900
    100 0.9901
    110 0.9910
    120 0.9917
    125 0.9921
    130 0.9924
    140 0.9929
    150 0.9934
    160 0.9938
    170 0.9942
    180 0.9945
    190 0.9948
    200 0.9950
    210 0.9953
    220 0.9955
    230 0.9957
    240 0.9959
    250 0.9960
    260 0.9962
    270 0.9963
    280 0.9964
    290 0.9966

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