Radio 7CS Cecil Scott station
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September 16, 1925. “RADIO” Page 499
Radio 7CS
STATION 7CS is situated at 14 Law A separate transformer to the H.T. three-coil Meisner, but now has many
Street, Launceston, Tas., and has transformer is used for the filament rariations and it is hard to say what
been in operation as a transmitter for supply stepping the 110 down to circuit it is at present, states the
the past eight months, although the either 6, 7, or 8 volts. This trans- operator, but the ‘‘sigs.” punch
through the ether, according to the
e’
number of QSL cards that have been,
received from all Australian States
and N.Z. ’Phone and I.C.W. are also
used at this station. 7
For ’phone grid modulation is
used after all methods had been tried
and is found to work the most satis-
factorily. Various kinds of transmit-
ting aerials have been tried, including
two wires, four wire cage on 6in.
hoops and now a single wire semi-
vertical, 35ft. high and a counterpoise
of four wires immediately underneath
7ft. from the ground is used. This
will shortly be cut down to two wires
and then, most likely, to one. Every
week and sometimes every night some-
thing is altered, sometimes getting
A corner of 7CS.
better results and sometimes worse.
A separate single wire aerial is
owner, Mr. A. Cecil Scott, has had an former can be seen in the photo. on used for receiving, most of the usual
experimental license for the past three the floor immediately underneath the DX being received on it.
years. A lot of research work has transmitter. The circuit used is the (Turn to page 508.)
been done at 7CS, including tests to
reduce the interference in Launceston
known as the ‘‘roar.”’
7CS transmits on a wavelength of
90 metres. Plate supply is obtained
from the A.C. mains and at present is Brown F. Type
either stepped up to 200 or 300 volts, Featherweight Head-
whichever is required. At the present phones. Weight only
6 oz., including coils.
the transmitter employs one five-watt PRICE:
4000 ohms, 35/-
120 ohms, 32/6.
—res meeme co-
‘mos SIDNOUD
402G 1130
HELLG . . OM. . UR 8165
ERe AT - s TitdE oN 2
Mi GOTINTR CONSISTS OF Lo loss / STAGE
M: GOLOUTR ConsiSTS OF RON
7
AVE ANTENNR CONSISTS!
Baf v‘ MG OVER TH& Caumt€RPOUSE
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Bring in long distance calls!
z3 NEW, unique principle of design ensures for
T
Brown A. Type Headphones extreme sensitive-
3
-
X ness to the weakest of signals. Their delicate,
conical diaphragms of spun aluminium are actuated by
3~»
infinitesimal currents. ‘Write for descriptive Booklet
No. 1.
7CS’s QSL Card. For all ordinary use, we rzcommend the F type 'Phones
shown above.
““toob’” and with 300 volts on the
plate an aerial current of 1.2 amp is NOYES BROS.
obtained on a wavelength of 90 (SYDNEY), LTD. (MELBOURNE) PTY.LTD.
metres. Before the current reaches SYDNEY: 115 Clarence St. MELBOURNE: 495 Bourke St.
ADELAIDE: Darlirg Building,
the plate of the wvalve it passes NEWCASTLE: 11 Watt St. Frauklin Street.
BRISBANE: Perry House,
through 42 rectifying jars, several Elizabeth Street.
HOBART: 145 Macqnarie St.;
and LAUNCESTON.
chokes and a huge bank of conden- Also from J. R. W. GARDAM, Perth,
sers. According to reports the QSB
of 7CS is very good and easy to read.
Mention ‘‘Radic’’ when communicating with Advertisers.