TELE-TECH & - AmericanRadioHistory.Com

plastic
molding
INJECTION
20 machines 2 -20 oz.
COMPRESSION
96 presses 25 -500 tons
TRANSFER
17 presses 25 -300 tons
Typical Custom -Molded Parts
INSERT
MOLDINGS
HOUSINGS
COIL
FORMS
Plastic
Hermetic
Sealing
ENCAPSULATION
EMBEDMENT
POTTING
For individual Components or
Entire Circuits . . .
PRECISION CONTACT
ASSEMBLY
ENCAPSULATED
COIL
PLUGIN TOROID
ASSEMBLY
COMPLETE MODULAR
CIRCUIT
All standard Epoxy and
special compounds.
MATERIALS PROVIDED
TO MIL & JAN SPECS.
BOONTON
MOLDING CO.
BOONTON. N. J.
DEERFIELD 4-4400
Power Gain Meter
(Continued from page 357)
5. The loss in the parallel tuned
tank circuit depends entirely upon
the Q of the inductance, therefore a
high quality coil is required. For instance,
let the Q of the inductance
be 100, the effective Q of amplifier
be 15, then
Foss = 20 log
100 - 15
100
- 1.4 db
The operation of this equipment is
rather simple. The transistor is first
connected in the desired configuration
on the three binding posts provided.
S, is then switched to the
corresponding transistor connection.
Switch S,, is switched according to
whether the transistor under test is
npn or pnp. Adjust r5 and r8 to give
proper dc bias current I. and bias
voltage V,.
Adjust the signal generator to the
desired frequency and a signal voltage
of 100 mv. Then, set switches S,
and S., until the millivoltmeter on
the output side reaches a maximum
reading. For frequencies below 100
xc, it is usually not necessary to insert
a parallel tuned tank in the collector
circuit. For frequencies above
100 xc, if a more accurate power gain
reading is desired, insert a high Q
tank circuit into the terminals provided.
Adjust the variable capacitance
to peak the output meter reading.
It may be necessary to adjust
switches S, and S, again after the
insertion of the tank circuit.
The millivolt meter reading can
be converted into power gain in db
from the chart.
Fig. 5 shows the variation of the
available power gain vs. frequency
of a junction transistor measured by
the equipment above.
TABLE I
All the resistances listed below are I/4 -watt
noninductive precision resistances. The resistance
values for switch I ore:
Switch
Position r: ohms re ohms
1 5.0 50
2 7.07 100
3 8.65 150
4 10.0 200
5 11.17 250
6 12.25 300
7 13.23 350
8 14.14 400
9 15.8 500
10 18.7 700
11 22.35 1000
12 27.4 1500
13 31.6 2000
14 38.7 3000
is revoloniz
a fax graphic utirecordinging !
ALFAX PAPER HAS MADE P O S S I B L E
CONTINUOUS, DIRECT GRAPHIC RECORDING
WHERE PREVIOUSLY PHOTOGRAPHY OR
SFCONDARY MEANS WERE NECESSARY.
ALFAX MAKES POSSIBLE:
Simplified, rugged recorders
Continuous, adjusterless recording
New fields of recording techniques
ALFAX ELIMINATES:
The problems of -Ink flow, capillary
action. humidity, and drying
The need for complicated equipment and
delicate adjustments
The dynamic range of this one universal Allan
Type "A" Paper provides a whole spectrum of
tone shades at writing speeds from inches per minute
to miles per hour. Using electronic signal outputs
of radar, sonar, on -off pulses and facsimile
transmission to record directly on Alfax, you can
get 19 tone shades instantly responsive to even a
tiny amount of current passage. The recorded im
age is absolutely permanent, non -smudging and non -
bleeding, and can be copied without further preparation
or processing.
Write for new booklet, "Recording
With Alfax", to Alfax Paper and Engineering
Company. Westboro 3, Mass.
Alden Adjusterless Recording Equipment -
Anticipates All the problems in Traffic and Motion
Studies -and Output from Electronic Detection
Devices -to High Speed Idea Transmission.
The universal abilities of Allan Paper has made
possible the development of a complete line of
simple, rugged recorders having only one or two
revolving elements as their entire mechanism.
Alden adjusterless recording techniques built into
these recorders enable you to explore the new
horizons opened up by Altai, while insuring you
fullest utilization of Alfax characteristics.
BETTER CONTROL OF PROCESSES AND OPERATIONS
ALFAX IN INSTRUMENTATION
Simple Alden Fact
Finders monitor from 2
to 30 operations simultaneously.
Alden Flying
Spot Recorders capture
faithfully by direct,
visual recording the full
output of electronic de- Automatic Curve Plotting
tection devices. with Alfas
FASTEST -MOST ACCURATE MEANS OF COMMUNICATION
ALFAX IN FACSIMILE TRANSMISSION
Alfax Paper, Alden Flat -
copy Scanning, and the
Alden Adjusterless Recording
Techniques provide
new high -speed facsimile
recording systems
that are the most accurate
..means of communication
available today.
Scanners transmit any Weather Map recording
copy at low or high speed with Alfas
to one or several record-
ers simultaneously in the
same building or one
thousand miles away.
Write Alden Electronic and Impulse
Recording Equipment Co., Westboro 10.
Mass. for "New Horizons in Recording."
358 For product information, use inquiry card on pages 209 -210.
Tele -Tech & ELECTRONIC INDUSTRIES June 1956