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Патент USA US2119692

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> June 7,1938.
"
1W.VOIGT
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#
2,119,692
ROD ANTENNA FOR SHORT WAVES.
Filed Oct. 25, 1935 ‘
7/
/3
O
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TRANSMITTER
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'
INVENTOR.
WILLI VOIGT
BY
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,
~
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I
I
ATTORNEY.
Patented June 7, 1938
UNITED
i
I
STATES
PATENT
OFFICE
~
2,119,692
ROD ANTENNA FOR SHORT WAVES
Willi Voigt, Berlin, Germany, assignor to Tele
funken Gesellschaft fiir Drahtlose, Telegraphic
m. b. H., Berlin, Germany, a corporation of
Germany
Application October 23, 1935, Serial No. 46,381
In Germany September 26, 1934
,
V
1 Claim. (01. 250-33)
In vertical antennas it is known, in order to roller 9 with adjustable mounting. The shaft of
shorten the length of the antenna and to obtain roller 9 has a suitable handle mounted thereon
a more favorable current distribution, to provide which, when turned, displaces the sliding con
at the upper end of the antenna a self -inductance, tact 6.
5 capacity, or both. Such an arrangement is deIn shortening the length of the radiator by described in German Patent No. 205,494. In the creasing the number of its individual parts, it will
known construction the self-inductance is previ- of course be necessary to also shorten the length
ously adjusted once and for all to the desired of the cord accordingly. To this end a suitable
Wave range. The tuning is then controlled by winding up means In is provided which collects
10 means of a variable tuning element disposed near the super?uous length of the cord. In order to
the base of the antenna.
tension the cord, the roller 9 will be moved down
In accordance with the present invention, this wards along a guide until the cord is suf?ciently
antenna arrangement can be improved by making tensioned, and following this the bearing of this
the self-inductance carried by the antenna vari- roller is ?xedly secured in place.
15 able for the Purpose Of tuning- The Variation of
The electrical connection with the transmitter
the reactance of this self-inductance is suitably
I2 is obtained by means of a lead l3. The an
accomplished bymeansof transmission andopera- tenna is supported from an insulator I4 which
tion of a suitable handle provided in the proxim- may further be mounted to the transmitter cas
ity of the base of the antenna. The antenna ing. The insulator may also be provided with
20 proper is preferably formed of rods or tubes the attachment ll serving for fastening the
placed on top of each other, whereby the length
of the antenna may be varied by adding or remov-
5
10
15
20
roller 9. '
What is claimed is:
ing single parts thereof. With this arrangement
it is possible to vary the range of the antenna
25 radiation approximately proportional to the
length of the antenna.
An embodiment in accordance with the invention is shown in the accompanying drawing,
given by way of example, wherein the actual
30 linear radiator is composed of rods or tubes l, 2
and 3. A self-inductance 4 is ?xedly secured to
An antenna comprising a vertical aerial com
posed of a plurality of serially arranged collaps
ible rods, an inductance coil connected to the top 25
portion of the uppermost rod of said aerial, a
capacity surface connected to the top of saidv
‘coil, a metallic arm connected to one end of and
arranged parallel to the length of said inductance
coil, and means for tuning said antenna compris- so
ing a guide roller mounted near the top of said
the upper end of the antenna, and to it a capacitive surface 5. For the control of the inductance
there is provided a contact 6. ‘This contact is
35 suitably controlled in such manner that it is
?xedly secured to a control cord 1 and moved
therewith. The cord is guided at the top of the
vertical aerial, a drive roller mounted near the
base of said vertical aerial, and a cable passing
over both said rollers, said cable having attached
thereto a sliding contact arrangement engaging 85
both said coil and said arm for varying the self
inductance of said coil.
antenna across a guide roller 8 ?xedly mounted
thereat, and at the bottom it is passed over a drive
'
WILLI VOIGT.
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