New-York tribune., 1922-09-17
Report OF Tribune Institute
Radio Laboratory for Week
experimental Work Is Being Conducted ON Supcr.
negenerative Receiver; Tests Include Two
complete Sets and Different Paris

During the last week exneriments
nave been undertaken in The Tribune
institute laboratory for the purpose Of
reducing the control clcmcnta in the
Armstrong super-regeuerative circuit
10 the smallest possible number. In
this connection it has been found that
all rhcostats can be eliminated entirely
and all CT the eondensers can be fixed.
with the exception of the condenser
which is placed across the loop aerial.
These experiments will be conducted
on the one tube and three tube forms
OF generation. Work Ia now
progressing with a standardized loop
aerial which can be convenientIv .
placed anywhere AS soon as these
experiments have been completely
finished the details and constants OF
the circuits will Se published in this
department.
The testing Of apparatus during the
week for approval By the Institute in
c'Uoes the following, which arc ap-
proved and carry ;hc guaranty back Of
them.
Regcnerativc Receiver Type RC
This is a single circuit rcgenerative
receiver with two stages of audio fire.
Quency amplifcation. which insure $
the operation of loud speaker over
reason able distances. The set actually
comprises two sections combined in
one cabinet. One section consists OF
the tuning element and the other the
vacuum tube circuits.
The tuning arrangement Is very
unique in that the aerial series con
denser rotor is mounted on the same
shaft as the rotor of the variometer
80 that both are tuned at the same
time. The maximum and minimum ad
Justmerts are taken care OF in this
manner and the set has a wave length
range of i50 to 70 meters
The ticker coil. which takes care of
regeneration, is mounted on the same
tube as the variometer and is tapped.
The taps are connected to switch points
on the back of the rancl. A three
plate condenser with separate control
handle takes care OF vcrnier adjust
ment
The three tubes ere controlled by
two rheostats. The set is equipped
with three telephone jacks, so that
the operator may listen in on the de-
tcctor. one stage or two stages OF am
plifieation, according to will. An CON
nectlons are made at the back of the
cabinet, giving the set neat appear
ance at all times.
The panel is micarta finished in
black. The cabinet is mahogany. A
door is placed on the tor of the tube
section so that the vacuum tubes can
be easily inserted and taken out The
set is completely shielded.
Manufactured By the Westinghouse
Electric and Manufacturing Company.
n-Regcnerative Set
Melco single tube -regcnerat:ye
set This set is. neatly mounted in a
mahogany finished case. f3Aa inches
long, I inches high and I inches deem
The adjustment dials for variocoupler
rotor and condenser. point switches for
coarse and fine adjustment of the pr
f1srY winding. flament rheostat. and
terminals for external connections are
mounted upon bakelte panel in the
front OF the cabinet.
The construction Of this set is unusu-
ally good. emphasis being placed upon
details which are ordinarily the cause
o. trouble. All connections are either
soidered or made with flattened loops.
and continuous wiring is used wherever
possible. One OF the unique features
is the type Of construction used in the
mounting of adjustment knobs for
point switches and rheostats Ball
, bearings between hardened steel disks
allow solid attachment and at the same
; time meke the adjustment easier.
The leads from the primary of the
1ariocoupler are set into the hollow
end of the switch point screws and
soldered This insures perfect con
tact and prevents short-circuit between
the points.
Litz wire is used in winding the
rotor OF the inductance in order to
cut down resistance in the secondary