Belt Valley times. [volume] (Armington, Mont.) 1894-1977, 1925-12-24

outer end connects 20 the plste ter
minal Of the radlO-freQuency ampllfies
tube. After the set has been tested. 4
may be well 70 try reversing thesl
connections
The nine-turn winding which follow
the direction of the secondary is con
nected In the plate circuit Of the de
tector tube. When the circuit q
under test. IL 1t regenerates or squeals
this coll IL wound too near the sec
ondary. Slide this coil away from the
secondary another quarter inch. This
viii prevent the regeneration TO the
extent Of stopping oscillation There
will still be q certain percentage Of
regeneration present which Ia neces-
sary In order that the receiver func-
ton on distant stations However. the
set should not squeal on any wave
length. II viii not rndIate. due to
the blocking effect Of the stage of
tuned radio frequency.
"cs Battery 10 Included.
A sC' battery seems TO be in style.
and so one has been included In the
circuit. II will improve reception as
well as prevent excessive drain on the
plate batteries. Ninety volts .sB" bat
terry viii require &C. battery Of As
volts. II one of the new RCA power
tubes is used In the last stage great
Increase In volume over the 201A Will
be obtained.
A word or two OF explanation con-
corning the tuning of this receiver is
given to enable those who have con-
similar outfits to obtain the
best Of results. There are but two
controls as far as actual tuning Is
One Of these to the left
Of the panel is employed to tune the
first stage Of radio-freqnency and the
antenna circuit. The second tuning
condenser is used to tune the detector
circuit. This adjustment is In control
81 the wave lengths and may be called
the "station seiect0r.' as II is used to
pick out the stations. If the set has
been properly constructed, this tuning
iIal should be fairly sharp on all sta
ions. II may be logged.
The radio frequency coll Is wound
IN q S-lnch tube about 9 inches long.
No. "a double cotton or siIk-covered
wire Is required for the winding The
sntire coil contains 80 turns OF wire,
With 4 taps take-off at intervals. Start
he winding about half an inch from
he end Of the tube. and before taking
he first tap, wind so turns OF wire.
Make loop or twist which may be
leaned later for connections. contin-
Ie winding the coil In the same dlrec-
ion until the SEVENTEEN turn. Take
mother twist and proceed to the
slghtieth, where another tap IL taken.
finish the coil at the ninetieth turn
nd leave a short end for connecting
he bus bar wire.
Two small brass braces can be
crewed to the bottom Of the coil for
loldlng it in an upright position on
be dashboard
This col should be placed directly
q back Of the aerial tuning condenser
nd about an inch away. The COOS
arsahla condenser which tuusa fhis |
OIL 10 connected TO the top turn. This
hould be made 10 the nxed or sta |
IOnary plates OF the condenser. In or
er to avoid any possible body ca
mciky." The rotor plata connection
oes 20 the antenna binding post on q
EK1p &C ghs rear Of the baseboard
cenmeeks 20 Grid TERMINAL.
The top OF tbs con also connects
D the wzad terminal CA the rmdlo-fre-
uaney tube socket Make the Lead /
. short az possibls and direct 10 the
picket, avoiding bends and fAncy-
haped wlrea-
The ameanna SERIES e0ndsnssr AIDS
|. bringing about resonance betwesn
h. pxamaFy Fmdso-frequency eirculE
nd the dekaefor eireuik. Ths adsmst-
.ene Of sAfs dial may not be- 80 crit
al nn the other dial acrOaa the sec
ndary tuning condenser. Il may be
ell 20 experiment With the taps on
le con winding PICK out tap wkich
ill give dial residing on the aneenna
,naenser which taken IN wave Lengths
ekweem 100 and $50 meters. It Ia
IfAcule 20 state ofghznd which tap
IN be correct. Once the proper turn
. located ehe head wire 60 the con-
snsar may be fixed permanently In
,me ca@em. however. n will be found