TELE-TECH & - AmericanRadioHistory.Com

Amplifier Design
(Continued from page 154)
For frequencies, above 23 Mc, 3rd
order distortion was to be 32 db
down at rated output; improving
db for db to 8 db below rated output;
and staying 40 db down for
lower levels of output. These design
objectives have been met.
moo
New SOLAR Step -Cap
lead -thru capacitors
speed assembly
and cut costs
Cupped ends are
silvered, for direct
soldering.
Part numbers
and /or coding
furnished on
request.
SOLAR MANUFACTURING CORP.
New York, N.Y .
SALES OFFICES: 46th & Seville, Los Angeles 58. Calif.
4000 W. North Ave., Chicago 39, III.
These units are the low- priced answer to lead -thru
wiring. Soldering is direct to silver in each end.
The ends are cupped, and serve as solder retainers,
keeping solder from bridging the insulating gaps.
Since center terminals are eliminated, the price
is reduced.
Fast handling and mounting. The simple contour
of Step -Caps permits their use in automatic parts
feeders. Units won't tilt when mounted because each
is self- centering. A "step- type" shoulder holds
each unit at the proper distance above ground,
and makes jigging unnecessary. Silver is bonded
homogeneously to the ceramic body to permit quick
soldering to chassis in multiple units.
Less space needed. The shoulder construction
eliminates the need for eyelets. Hence these units
can be mounted much closer together, leaving
more room available on the chassis.
Immediate deliveries in unlimited quantities.
SOLAR lead -thru Step -Caps are furnished in
capacity ranges from 3 to 275 mmf @ ±10% and
±20% tolerances; from 276 to 1000 mmf @ GMV.
Units are rated at 600 VDCW. Mounting hole: .193 ".
Can be supplied with center lead as a feed -thru type.
Write for samples and details, or send us your
requirements.
"QUALITY ALWAYS"
CERAMIC CAPACITORS PRINTED NETWORKS PIEZO CERAMICS
Automatic Tuning Facilities
The band spreading inherently
afforded by the tank circuit,
coupled with the precision of the
vacuum variable capacitors and
the circuit stability, make it easily
adaptable to automatic tuning.
Production amplifiers will include
servo -motor drives for each of the
amplifier tuning controls with an
overriding clutch permitting manual
adjustment of the controls in
initial tune -up and in emergenoies.
Compatibility with the automatic
tuning facilities of the driving
transmitter is obtained by essentially
duplicating its servo
control panel for use in the linear
amplifier and interconnecting so
that the driver and the amplifier
can be controlled together from
the amplifier location or remotely.
The servo -amplifier panel will
be housed in a 2 ft. wide cabinet.
normally installed between the r -f
and rectifier cubicles as shown in
Fig. 4. The narrow cabinet also
houses air ducting which permits
entry and exhaust of cooling air
either above or below the cabinet.
The air system is of a high velocity,
low volume type with capacity
permitting operation on 50 cps
power at altitudes up to 8000 ft.
Conclusions
Ingenious use of modern components
has resulted in desirable
simplification, reduction in size,
and high performance in a high
power linear amplifier for single
sideband communications applications.
These improvements have,
in addition, made possible an appreciable
reduction in the cost of
improving and extending existing
communications facilities. It is
believed that further efforts in
these directions are necessary to
maintain the standards of reliability
previously established by
military and commercial high frequency
fixed stations.
160
For product information, use inquiry card 011 pages 209 -210
Tele -Tech & ELECTRONIC INDUSTRIES June 1956