&
THURSDAY. OCTOBER 20. 1960
KEDFOHD MAIL TRIBUNE., MEDFORD. ORE.
I U
Study Shows Smog
Interrupts Radio
And TV Signals
Angeles-(Science Serv-lcc)-When
temperature inver
sion clamps an atmospheric
lid over a city, high-frequency
radio transmission from
the ground to high-flying
planes or missiles can be cut
temporarily.
The inversion layer, already
notorious as a major smog
factor can also interrupt ra
dio contact between two land
point$ in direct line of sight.
The findings were reported
after three years of experi
ments by Prof. W. D. Hersh
b e r g e r, assistant professor
Richard, C. Mackey and Dr.
Warren L. Flock, University
of California at Los Angeles
radio engineers.
In 1956, the three engineers
set up a transmitter on the
24th floor of the Los Angeles
City hall and a receiver on
top of the UCLA physics
building, establishing a micro
wave path 1Z.4 miles long.
Transmitting at 36,000 meg
acycles, they found that sig
nals came in strong and clear
on smogless days. But on days
with temperature inversion,
signals faded, at times com
pletely, especially when the
inversion layer was below
1,000 feet and while the sun
was rising.
The importance of the
study lies in setting an upper
frequency limit of 36,000 meg
acycles for radio transmission
during smoggy days. Only on
frequencies below 36,000'meg
acycles will communication be
completely reliable.
Radio engineers have a very
practical interest in determin
ing this upper limit. Although
they can easily penetrate the
inversion layer by trans
mitting on lower frequencies,
higher frequency transmission
has an advantage because it
requires a smaller receiving
dish and less bulky equip
ment. The experiments also show
ed that microwaves are a fast
er although more expensive
means of fixing the height of
an inversion layer, especially
between 500 and 1,000 feet,
than the present method of
sending up balloons.
4-K NEWS
Eagle Point Ranchers
The Eagle Point Ranchers
4-H club held their meeting
Oct. 10 in the Eagle Point vo
cational agricultural build
ing. There were 24 members
and 9 visitors present. It was
decided that we make at least
two reports a year on our
projects.
Our next meeting will be
held Oct. 24 at 7:30 p.m. in
the Eagle Point vocational ag
riculture building.
Susan Harper,
Reporter
Central Point Beef Club
The Central Point Beef 4-H
club held a meeting Oct. 17
at the home of the leader,
Floyd Charley. We elected of
ficers. They are Nikki Ham
mond, president; Carolyn
Sidener, vice president; John
Swartsfager, secretary; Judy
Frink, reporter; George Way,
sergeant at arms; and Carol
, ?J orris, refreshment chair
man. Our next meeting will be at
the home of Carolyn Sidener
at. 7:30 p.m. Nov. 21. Refresh
ments were served by Mrs.
Charley.
Judy Frink,
Reporter
Merry Makers
The Merry Makers 4-H club
met Oct. 15 at the home of
Mrs. Dwight J. Albright.
Marilyn Peyton and Linda
Lemley were co-hostesses for
the meeting. Mrs. C. D. Lem
ley and Douglas Lemley were
guests.
Demonstrations of how to
cut designs in sandwiches
weTe given. Plans were also
formulated for taking pic
tnrpe and nnttine them on a
bulletin to be distributed to
children at the hospital.
The- next meeting is Oct.
22. Halloween snacks will be
made at that time.
Meadows Busy Beavers
The September meeting of
the Meadows Busy Beavers
4-H club was held at the
home of Wes McDonough.
Nine members and two vis
itors were present. Visitors
were Mr. and Mrs. Wes Mc
Donough. Discussion of possible com
munity projects was held.
Completion of members proj
ects was also discussed.
Cynthia Pleasant,
'Reporter.
Willing Workers Club
The Willing Workers 4-H
club met at the home of Mrs.
J. Anhorns Oct. 11.
Christmas projects were
discussed. The club set Nov.
IS as the date for its achieve
ment night.
The next meeting will be
Nov. 21 at the home of Mrs.
Anhorns.
Mary Kurz,
JOHNSTON
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