The Wingham Advance Times, 1925-04-23, Page 7Thursday, April
rl
, fi905
WINGI•IAMt ADVAN &%E -TIMI
.ADDING CRYSTAL DETECTORS
TO TUBE SETS
By R, M. 'S1 Brill
(Radio Engineer)
It is a well known fact that detec-
tors cannot be excelled'for their quali-
ty of tone and quietness, in detecting
radio signals, There .are a number of
high grade tube sets on the 'market
which, continue to use . a crystal . in
place of a tube for the detector.
Many of the sets now using tube
•
•
r/claERD/AL SEcnlvnARY
tubes but with a • crystal detector,
i give as much volume • as before, be
quieter in operation, 'and be very
;much more selective, In addition, as
all of the tubes are now acting as am-
plifiers„ you do not have to fool with..
the tapped B battery for your .detec-
tor plate. voltage, Moreover, the grid
condenser and grid leak are eliminat-
ed.
Take, as , an 'example, the tickler
set ..shown in Figure x. The sec.•
PLATE
FILAMENT
,p.P AMPCIF,ER
rICKLER'DIAL
C4IL18RATE THIS DMA
FOR WAVELENGTHS
SUPER DYNE
FIGURE a
TR Cif
FILAMENrs aF. DerecroR
' O A•F.A14PUFIER
eimir;• ,
COIL$ sET BACK FROM PANEL
TO HYO/D aoo)-CAPACI'rr
r/cfrLER
SECONDARY
PR,MARy
detectors may be easily changed to
use crystals. The tubes Which were
previously used for -detectors, may, if
•they., are -hard tubes 'such as the UV
.201A, be used -as radio frequency am-
plifiers. With such an arrangement
%2 set will, with the same number •of
.9LOCK TO gDJVSr O srAixce
8E•rwiEN SECONDARY
ANO rlrl(I.Ent
I
and diagram shows how this same
circuit was converted into one with
an R., F. amplifier and a 'crystal de-
tector. The same number of tubes
are used in both circuits. The extra
parts needed are:
i .23 plate variable condenser.
as " El+r MEM
se Su
Els®
erten p1.:,,.s;.�� i
Costs no more than the ordinary kind
Ea
111
.10
,1 We have opened a Service Station gra Wingharn
Oppo ite the Bell F .l. dory
and invite you to buy your Gasoline
from us.
A .TRIAL IS ALL WE ASK -
101111311
611
Barri
Phone 174, Winghami.
We also handle Kerosene, Motor Oil, Cup Grease, in
la
Transmission Lubricants, Etc.
!Billion nom .: malualtll®viiiman
SHALL WE C n P f`I'
AND CONSERVE OUR FOREST CAPITAL
STABILIZE INDUSTRY
ENSURE FUTURE PROSPERITY; or
SHALL WE MINE IT,
AND DEPLETE OUR FOREST CAPITAL
UNDERMINE INDUSTRY
MENACE FUTURE 'PROSPERITY
National interest and National Security demand the Treatment
Of Our Forest Resource as a Crop
THE OBSTACLE TO PROPER TREATMENT IS FIRE
THE CAUSE OF FIRE IS CARELESSNESS
THE CURE 0I CARELESSNESS IS AROUSED PUB
-
WC OPINION
We Must All Play Our Part
HON. CI•I:ARLES STn ART, Minister of !the Interior
TF1
WROXETER =COUNCIL
Council meth regular meeting on
April 27th,, x925. Present; -Alex.
Wright, A. J, Sanderson, Gavin Da-
vidson, E. Dobbs. Reeve Idenneberg
in the chair.
The minutes of last meeting were
read and adopted onmotion of
Wright and Sanderson,
Accounts were; --T, G.' Hemphill,
power and relit for • March 149.00;
PI, Patterson, running E. L plant, ov-
211 er time supplies and wovk
r.
65c, 75c9 85c per l Bert 11lartin, work and supplie$565:700°;;•
I Municipal World, supplies 4:25; J, N,
a _•COFFEE
Im Alin, for school purposes 65o.00.
Motion of Davidson and Sanderson
OC per b. is that these accounts be paid and ;,or-
tiers drawn on treasurer for same,
P COCOA
Motion of Dobbs and Davidson that
40e peril.
F When you buy any of these
specialties at .Cbristies you're
getting the BEST that Money
Can Procure,
6 Try a Small Quantity with
your next order.
EVERYTHING IN CHINA-
= WARE AND NOVELTIES
-r
11411.111E11111111111111111111.10111110111 111E1111
Council refund Bank of Commerce
$88, over charges on Electric +light
used.
N_ Motion of Wright and Davidson
that Council accept Collectors . roll.
Hall Committee was asked to see
that the Town Hall be cleaned 'up
and be kept in better condition..
Motion of Sanderson and Wright,
P. Council adjourned to meet at regular.
meeting or call of the Reeve.
Fred Davey, Clerk.
1111E111
i Crystal detector,
x R. F. transformer (home-made).
I 200 Ohm potentiometer.
i Switch lever and points.
It will be noticed that in the second
circuit the tickler has been replaced
by the new -variable condenser CC,
so , that the total number of tuning
controls remains the same.
Construction
The condenser tuned R. F. trans-
former T is very easily made, Care
should be taken in its construction
however, in order to take advantage
of the selectivity which is obtainable.
The secondary consists of 5o turns
of 24 gauge copper wire wound on a
3.5 inch diameter. This winding
should be evenly spaced, the turns
being separated by the width of the
wire. The primary winding consists
of 3o turns of the same wire wound
directly over the secondary winding
It is well to have a sheet of writing
paper between these two windings.
The• prirritry winding should be tapp-
ed at 10, 20 and 3o turns.
The crystal detector. should -be of
the semi -fixed type. This crystal is
not nearly so hard to adjust when it
has a tube amplifier before it, and it
will usually hold its adjustment for a
long time. •
The by-pass condenser, shown
across the primary of the audio fre-
quently transformer has a capacity of
0.00025 lVifd. The grid condenser
from the original circuit may be used
for this.by-pass.
The potentiometer is.for controlling
the grid voltage of the first tube to
prevent it from oscillating. When the'
slider on the potentiometer is mov-
ed over to the positive side, the poli..
tive voltage which is thereby. applied
to the grid is what prevents the oscil-
lation. The signals are the loudest
however, when the grid is as nega-
tive as possible without oscillation.
The taps on the primary of the R.
F. transformer form a rough control
of oscillation. It will be found that
for the shorter wave -lengths a small-
er number of primary turns should
be used.
The rotary plates of both conden-
sers should be connected to ground.
Radio Questions and Answers
(Mr. Sherrill will be glad to help
you solve your radio problems.
Write him in care pf this paper.)
J. E, says: "I am not getting very
good, results from my electrolytic
rectifier for charging batteries. How
can I get a higher charging. rate? I'
am using two 75 watt lamps at pres-
ent. What- strength of Borax solu-
tion do you use?"
Ans.-You can get a higher charg-
Ing rate by adding another 75 watt
lamp in parallel with the two , you
have at present. This is not advis-
able however as• the higher rate will
cause too much heating. Put as
much Borax in the solution as will
dissolve. Stirring the solution will
dissolve the Borax faster,
., M. S. T. asks: "Is it necessary for
the primary and secondary coils in 'a
Superdyne receiver to be wound in
the same direction?"
Ans.-No. The direction of the
'winding makes no difference.
H: G. wants to know "if, in a ,re-
ceiver which has the panel and the in-
side of the cabinet shielded, it is all
right to make the connections fromi
the tube sockets directly to the shield,
The shield is grounded to the nega-
tive side of the A battery."
Atte--It is all right to• make the
negative, A battery connections in
the sockets in this way but 'be sure
that everything else is well insulated
from the shield,
Poor_ Anthony Coccyx! .lie's so
cross eyed that everything be puts a
penny.it a slot machine he gets salt-
ed peanuts instead of chewing guru,
EAST WAWANOSH
hiss MacGregor is visiting with her
sister, Mrs. Robert Shiell,
Mr. Melville Beecroft, left on. Mon-
day for "the last term at London Nor-
mal School.
Mr. Norman McNeil of Seaforth, is
renewing old acquaintances here this
week.
Mr. and Mrs. Jack Campbell and
daughter left on Sunday for their
home at Aylmer.
'TWAS THE CONSATE
To the Edith" av the Advance-Toirnes
Deer Sur,- '
I suppose mebby wiry lasht man in
town is glad that Shpring is here,, av-
en if we are all six months oulder
than we wus- lasht . fall, an the wim-
min too are plazed, barrin fer the
houseclaynin. What surproises me
is, that if; they disloike the jawb, as
they say they do. whoy they do so
much more ; av it than is nayded.
Shure,. the min are ,not askin thim to
shtir tings tiip. It musht be the nat-
cheral contrayriness av the craythers.
.( What differ does it make to us min
whether the soideboord shtands on the.
aist arr the wesht soide av the doinin
room, an the mosht av us wud nivir
notice if it wus.,,put out in the kitch-•
in, arr down cellar, fer that matther,
if it wussen't fer hilpin wid the mov-
in it? I nivir cud see the sinse av
moven the bidroom furnichoor ar-
round into diffrunt positions afther
ye git used to havin it wan way, so
that whin a--shtoxm .comes up in the
noight an ye git up half ashlape to
shut the • windies, an bark yer shins
agin the dhresser an shtub yer in-
growin toe, nail on the rockin cheer,
an tink-tings ye mustn't say fer fear
the inissus is only purtindin to be
ashlape. Shure, wiinmin are loike
thim cross wurrud puzzles,' we waste
a lot av toime over thim but we hate
to give thio up.
• Well, annyway winther is over, an.
the warrum days will soon 'be here,
so us ould fellates kin enjoy 'oursilves
sittin in the sun an talkin av the de-
giniracy av the roisin ginirashun, jist
as can- fathers talked about us, whin.
we: wus young. 'Tis the way av the
wurruld. We tink the young payple
hev all gone crazy fer shports an
amusemints, an sometoitnes it Inks
loike it, wid the auto roidin, an base
ball, an soft ball an all the resht av
it, but, Shure,, didn't we hev our own
ways av amusin oursilves whin we
wus young. I' hild the championship.
av the Township fer pitchin harse
shoes fer foiveyears in succession,
an theer wussen't a young fellah ah-
nywheer who cud droive -the shtakes
fer the ould harse powertrashin ma-
sheens wid fewer shtrokes av the
sledge than I cud mesilf, an I nivir
met but wan titan who cud trow a
showlder shtone• as far as -I cud, in
me besht days,, We wus jilt as anxi-
ous fer fun, an jist as kane to throy
our sldiill again the other fellates, as
the byes are to -day, an if we had had
anny money, an autos had been in-
vented in thim days. Mebby we wud
hev been just as crazy as the young
payple av these toimes.
'Alleyway tings are as they are, an
they moight aisily be betther, an
they moight be wurse, an mebby they
are fer annyting I know,
But, as I said at the shtart av this
letther, winther is over an we are glad
av it. 'Tis all roight to talk av the
beautiful shnow whinye can't hilp yer
silf, but, thernosht av us prefer the
grane grass. 1 tink .all the soigns
point .to a purty . good summer fer
business, wid the auto mill dickoratin
all the front slitrate wid new gasoline
pumps, an the Horticutcht.vral Socie-
ty gi.ttiti in a car 'loa'd av Giadolcum
bulbs to beautify all the gardens an
vacant earners on the back shtratcs,
atz inebby an elickshun befoor the
summer is over, payple are beginnin
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Walls With Character
NrY room of yours can gain a new and last-
ing loveliness, a distinctive character and
charm from even the least expensive of the
superb new Wallpapers we are now showing.
Then, again, We specialize in STAUNTON
SEMI..TRIMMED PAPERS which can be
accurately and quickly trimmed without the need
of a straightedge and knife or a, pair of scissors.
They save time and trouble and eliminate half.
the disorder in the home when re -papering
is in progress. •
Let us show' you our new samples for those rooms
of yours that need attention
11-11
I> ' S ® aN
m
I Phones x8 and x16
Agent, Can. Nat. Telegraph
Il OMIN111U d1N111E11 N 11111p111e111m11111IB@l1111 IWNI11NWAEAII E I O IIM11 I INl1JE11111111 MMIE!
`0•1164041.0•3661.04/101,060.1.1.41.131.P...04=71..1104013.
am.aamorbssoproomemeanosuar,
On April 13th We are opening the Egg Po,.r��,
for 1925 --.-
This will afford the Egg Producer an opportunity to get away
from low price Eggs. _Come in and let us talk it over.
OUR TRUCKS will soon be on the road Gathering Cream and
Eggs, if you call the office we can tell you the. day they pass your/
door.
The United Farmers Co -Op. Co., Ltd.
Winghall t . - ';tntari,r.
lexasatespamoravamantecmaanosannim
to regain confidince intings, an to
belave that the counthry is comiii
troo all roight, so that they are not.
afraid to shpind a quarther fer fear
they will nivir see it agin. An whin
the payple hev confidince in tings
the battle is as good as won. 'Twas
the consate they had in 'thimsilves
that made our Canadian byes such '•a
terror at the front, an shure, some av
thim brought more av it home wid
thim than they nade, if they are all
loike me own bye.
Yours till nixt wake,
Timothy Hay.
Horizontal
I. Precise
7. Publish
g. Small, powerful engine
12. Pierces
x3. Silly
14. A fermented liquor
15, Make harmonious
x8. Mineral Spring
2o, Toothed wheel
22, Plate
23: Carry
24, Mohammedanism
26. Prefix meaning "not"
27. Sylvan deity, part man and part
horse
28. Energy
30. Distant
31. Finish
32, Atmosphere
33. Tendency
36. Postscript' (abbreviation)
38. Alluvial deposit at the mouth of
a river
41, Periods of time
42. Buckle (Archaic)
44, Legal claim
45. The central body of the solar
system
46. Long winged sea bird
48. National (abbreviation)
49, Perpendicular style of architec-
ture
51. Ladies
Ss, Large sea duck
54. Goddess of the hunt
55. Criterion
Vertical
x. Biblical name
2, Largest island of the West Int
die§
Women's girdles
Basic substance • from ammonia
5. Sound
6. Seventh letter of the Greek al-
phabet
7, Islands (poetic)
8. Rob
1o. Start
I1. Compensate
14. Rouses
16. A soft metal
x7. An Indian tribe
1g. Proud, haughty
21. Glossy black birds
23. Round bulging vessel or cask
25. Obey
27. Declared
29. Physician (abbreviation)
30. Fourth note of scale
34. The way to be traveled.
35. Feeling of weariness
36. Tap
37. Scruple (abbreviation)
39. Thread orcloth• of flax
40. Annoy
42, Earth (Latin)
43. Given name of • one of DeWolf
Hopper's wives
46. Imaginative thinker or writer
47. lied of a wild beast
5o. Dentist (abbreviation)
52. Insane
3.
4.