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Radio News for November, 1928
1_16
SPEAK ° R..,
OPER4TION
froren a
--CRYSTAt
NO "TUBES"-NO "B" BAT-
TERIES - NO COSTLY
"ELIMINATORS"
WITH THE
SKINDERVIKEN
TRANSMITTER UNIT
Simple microphone unit provides a most effec-
tive and inexpensive way to satisfactory speaker
operation. Easy to build and operate circuit.
Everybody can do this now with
a Skinderviken Transmitter Unit.
The unit is fastened to the diaphragm
of the speaker unit. It will
net as a "micropfonic relay." Every
time an incoming signal actuates
the diaphragm, the electrical resistance
of the microphone unit will be
varied correspondingly and the current
from the battery. in series
with it and the loud speaker, will fluctuate accordingly.
Thus the problem of securing sufficient power
to actuate the loud speaker is simply and adequately
sol ved.
The results from this very novel and simple unit
will astound you.
The expense of this hook -up is trifling compared
to the elaborate tube circuits that give no greater
act =Non of the speaker.
Besides this there are many other valuable uses in
Every
IGulio Circuits for this marvelous little unit.
builder of Radio sets should have a few on hand.
LISTENING THROUGH WALLS
This Unit makes a highly sensitive detectaphone,
the real thing -you listen through walls with ease.
Plenty of fun and real detective work too.
CONDUCTING' SOUND THROUGH
WATER
Make yourself a
miniature submarine signaling
apparatus like those used during the war. Simple
circuit with this microphone unit gives splendid results.
12 -PAGE INSTRUCTION BOOKLET
containing suggestions and diagrams for innumerable
uses, furnisher) with each unit.
P. G. MICROPHONE TRANSFORMER
A Modulation 'Transformer
specially designed
for use with
the $kinderviken Transmitter
Unit. Has many
other uses. Primary
resistance,
)iohm;seeondary,
55
ohms.
FOR SALE AT LEADING DEALERS
Or Order Direct, Using Coupon Below
SEND NO MONEY
When the postman delivers your order you pay him for
whatever you have ordered, plus a few cents postage.
PRESS GUILD INC.
R.N.-11-28
14 -18 -R-East 30th St., Ness York, N. Y.
Please mall me at once as many of the following items
as I have Indicated.
..Sklndervlken Transmitter Units at 95c. for 1; 51.75
for 2: $2.50 for I: 83.20 for 4.
.. P. G. Microphone Transformers at $9.
When delivered I will pay the postman the cost of the
Items specified plus postage.
Name
Address.. .
City
State
Please
place a listener with two tubas will get .4 nstralia
and England; in another it cannot to done with
the best ten -nrbc hook-up. These are matters still
in the realm of experiment.- Eoiroc.)
A SMALL TUBE GETS RESULTS
Editor. RADIO Nrws:
I trier! out a small edition of Mr. Loveless'
aerial. I simply wound a hard- rubber tube 3
inches in diameter and 7 inches long full of loop -
aerial wire, and another tube a little smaller full
of the same, and put it on my 5 -tube set for an
experiment.
It brought in local stations 100% better, with
slight loss of volume and a change of about 7
points lower on the left -hand dial. When I tuned
for DX, I brought in WSM, which I couldn't get
on my regular aerial, but threw the left dial so
far off (about 13 points above 45 on the dial, and
from 7 to 10 points below this) that I didn't like
it. So I just hooked both leads to the ".\er" post
and found it to work much better on all stations
than my outside aerial. With this connection I
brought in approximately twenty -five stations on
August 11th, including some I couldn't get any
other way. Then I put it on the short -wave
"Junk -Box" receiver and it worked better; so I
left it on. I couldn't get anything without the
ground. Do you suppose an "A and B" power
unit would cause such a change in the settings.since
the eliminator is grounded ? My groceryman is
making a regulation Loveless aerial, so I'll try
it out.
I am pleased with the "Junk-Box," and if I
had used best -grade parts, perhaps I would get foreign
stations also: but being next to an ice -cream
factory probably affects DX. I get 2XE and WLW
regularly; but KDKA does not come in as regu-
larly as I thought when I built the set, and I
have not had 2XAF; though I have tried hard
for it.
E. C. HAVES,
324 Plymouth .4re., Buffalo, N. Y.
(Adding inductance to a tuned aerial coupler
must, of course, alter dial settings, unless capacity
is also rednced to make up for it. .4s for the power
unit, its effect would depend upon the actual resistance-to
ground -of the system.)
WE SUGGEST ASBESTOS
PHONES
Editor, RADIO NEws:
I write this listening to a concert from KFAD,
Phoenix, with good loud -speaker volume, while
the temperature is around 102 in the shade (Sorry
O11). My longest reception is WGY at 4:30 p. ni.
in the winter. As for night reception, all winter
long I crawl out of the hay to pick up real DX.
Here are verified receptions: JOAK, JOBK,
Japan; JOD1c, Korea; 2BL, 2FC, 3L0, 4QG,
5CL, Australia. (Not verified, JOBK, Japan;
2YA, New Zealand.) All this on three tubes.
From October to February, there was hardly a
night I did not get JOAK and 2BL with good
phone volume and loud- speaker volume that could
he heard twenty feet away.
I would like to get in touch with DX fans
who are using small sets and getting real DX,
as I want to compare notes.
I like RADIO News much better since the change
in policy.
GILBERT HALE,
Douglas, Arizona.
PHONOGRAPH SWITCHOVER
Editor, RADIO NEWS:
I recently invested in a phonograph pick -up; one
of those which, by inserting a plug in the detector
socket of the set, allows you to use the audio
tnd as an amplifier for the phonograph music.
SECONDARY
NOT US.D
A-
ANY-
WHERE
IN SET.
PHONE
PLUG
Sir.
PET. TUBE
VOLUME CONTROL
-G
I :.
AUDIO
TRANS.
-F
JACK :. ( PICK-UP
EXTENSION CORD
TO PICK -UP.
Miller's switching arrangement.
say you saw it in RADIO
.
499
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CIF
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OF AMERICA
326 Broadway
New York, N.Y.
Dept. A -11
NEWS
RADIO INSTITUTE
OF AMERICA
Please send me your new booklet with
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Study Course of Radio Instruction.
Name
Address
City
Dept. A -11 326 Broadway
New York City
1
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