The Bismarck tribune. [volume] (Bismarck, N.D.) 1916-current, 1925-07-13
US. EXPLORER
T0REP0RT BY
RADIO DAILY
Macmillan Expedition to BE
in Constant Commune
cation With Home

Chicago, July l3.-CP) -Continuou
radio communication is expected will
the Macmillan Navy Arctic expcdi
ton, which was spasmodic and fire
quently interrupted on Mac lillian
last voyage when radio cquipmcn
was first taken into that region. A.
extensive and elaborate radio plant i,
with this expedition, designed anc
planned with Arctic use in view. Tn,
equipment last year was compa rative
~ poor and mcagcr, permitting OF
limited experiments.
The first test will come when the
expedition enters the boundary of 81
north latitude. where last year all
reception faded away. This "lost
sector" continued until past 7G north
latitude. There was no known rea-
son at that time for the inability to
hear United States broadcasting be
tween those two attitudes, although
the aurora borealis exists in that
land. 1t is believed to have been an
influence, as Immediately after pass.
ing it reception again was had. The
low wave transmittcr was designed
to penetrate this region.
The only apparatus on the Bowdoin
last year was Of the $50 metre type,
which Chief Of Radio Mcdonald again
took along to prove that it would not
work in daylight. The expedition
heard L. S. broadcasting stations un-
til it reached IS north, when all re-
ception ceased. At rs, North Amer
lean amateurs were again picked IN
and at 1890 the broadcastinc sta
fInnc ~ in Tho L.,
ness established communication in
British Columbia, Catalina Island and
various western stations in the Uni
ted States.
Two way communication was had
with an amateur in Hawaii and Il New
Zealand operator received message
from the Bowdoin, although it was
not possible to establish two wav
communication.
If difficulty is experienced in
getting out Of the "last sector" Me-
Donald will change the transmitting
schedule and go far below 20 metres.
Inc equipment is prepared to send
on wave as low as one metre.
News messages with the 1870 metre
set were heard last year from POI in
Iermany, and station in England
also was picked up. Previous ar
rangemcnt had been made with the
Battle Harhor station. the farthcst
north radio outfit, but neither was
able to communicate throughout the
trip. The operator at this station
on this trip was given two low wave
length receivers and better success
is anticipated. The station operator
mt Battle Harbor is a professional,
nut 1t remained for his amateur
Trends far away to make contact last
year.
The area in which broadcasting was
lost was pie-shapcd. With the Bow
dom as it's apex, the right arm ex-
tended south and west cutting lust
east of Chicago. It's left arm
stretched south and east into mid.
Atlantic. about half way down the
length of the United States. No
United States amateurs or broadcast
ing stations in this region were heard
by Mac MILAN, nor was Macmillan
heard by listeners in that same re-
gion. Chicago was the most easterly
station heard, although western sta
lions came in distinctly.
Twenty complete standard broad
cast receivers, with a newly patented
dry battery which is expected to
withstand the Arctic climate, were
taken along by Macdonald to be given
missionaries along the, route.