close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2077289

код для вставки
April 13, 1937.
I
_ -
M_ VQN ARDENNE
'
2,077,289
METHOD OF AND ARRANGEMENT FO_R RECEIVING SHORT WAVES
Filed Feb. 5, 1934
JnVen/or:
2,017,289
Patented Apr. 13, 1937
UNITED STATES
PATENT OFFICE
2,077,289
METHOD OF AND ARRANGEMENT FOR
RECEIVING SHORT WAVES
Manfred von Ardenne, Berlin, Germany
Application February 5, 1934, Serial No. 709,707
_
In Germany February 15, 1933
2 Claims. (Cl. 250-27)
In the construction of receiving apparatus for frequency dependency in accordance with the
short waves, more particularly for waves of less invention for improving the ef?ciency of the
than 10 meters, it has been found that a satis— grid leak recti?cation for short waves:
factory sensitiveness of the recti?cation can
There is used strong positive grid potential
5 not be obtained more particularly when using
and small grid leakage resistances in the order
audion recti?cation. The order of magnitude of 104 ohms, or the use of leakage chokes of
of the rectifying effect amounted in this connec
small ohmic resistance.
tion to merely approximately 10% of that par
When employing connection systems having
ticular value caused by the same control poten
resistances with the value and arrangement as
10 tial when normal radio waves are recti?ed.
set forth in accordance with the invention it is 10
By careful investigation of the frequency de
possible to produce receivers for short waves,
pendency of the e?iciency of the recti?er the ap and more particularly waves of less than 10
plicant has been able to ascertain the reasons
for the low frequency, not occurring in the nor
15 mal radio frequency range, and to ?nd means
for remedying the same.
Experiments of this nature may be conducted
in such fashion that one and the same high
frequency amplitude is conducted to a tube rec
meters ‘ (preferably for television purposes“),
which have an adequate sensitiveness, even with
out intermediate frequency.
15
In the drawing there is shown by way of an
example a form of embodiment of receiving and
rectifying systems for anode-bend recti?cation,
the connecting elements in the working circuits
having the values according to the invention. 20
The single parts are the recti?er tube I with
the cathode 2, the grid 3 and the anode 4.
anode circuit. By such measures the applicant ~
Between the grid and the cathode there is
has found that the recti?cation of short waves provided the oscillatory circuit 5, which com
is considerably better if relatively powerful cur
prises the self-inductance 6 and the variable ca
rents are eifected in the recti?er circuits. Ac
pacity 1, whereby the grid is tapped over a re 25
cording to the invention, this is effected by em
sistance
8, which in accordance with the inven
ploying small resistances in the anode circuits.
tion
is
in
the order of 104 ohms, and in order to
Experiments have provided the following re
obtain the smallest possible damping effect there
30 sults:
is connected in parallel with the leakage re
In connection with grid-‘leak recti?cation ex
sistance a capacity 9. The battery l0 serves to
periments have shown that the efficiency may be produce a strong positive potential for the grid.
considerably improved by the use of small grid
In the outer anode circuit there is connected
leakage resistances or by the use of leakage a resistance
ll. Coupling is performed through.
35 chokes in the grid circuit. The frequency de
the medium of a condenser I2.
pendency itself appears not to follow a simple
35/
I claim:
rule in this connection, in the range of higher
1.
In
a
tube
for
rectifying
short
waves,
more
frequencies.
particularly for waves of less than 10 meters,
The grid current, the ascending curve of which
using grid leak recti?cation, a cathode, a grid
is employed for the grid-leak recti?cation, oc
curs in the potential ranges which are employed and an anode, said grid connected to a rela 40
in practice by reason of extremely slow electrons tively high positive potential over a relatively
having speeds which are less than 1 volt. The small grid leak resistance in order to make the
time the electrons take to pass the distance be
electrons assume higher speeds not until the elec
tween the electrodes shorter than a period of the
45 trons have passed the grid, 1. e., at a time when
45
control has already taken place. As long as the high frequency to be recti?ed.
2. In a tube for rectifying short waves, more
electron speeds are so small the time in which
an electron is passing from cathode to anode is particularly for waves of less than 10 meters,
such that the same is greater, or may be greater, using grid leak recti?cation, a cathode, a grid
and an anode, said grid connected to a relatively
50 than the period, for example, of a 7-meter oscil
high positive potential over a grid leakage choke 50
lation. From the in?uence exerted by the du
coil having small ohmic resistance, in order to
ration of passage of the electrons, which can
make the time the electrons take to pass the dis
not be ignored in the recti?cation, there results tance
the electrodes shorter than a pe
the frequency dependency of the recti?cation in riod ofbetween
the
high
frequency to be recti?ed.
the frequency range above stated.
65
After having found out the reasons for this
MANFRED VON ARDETNNE,
tifying connection system at a frequency varied
between A=3 meters and 200 meters, and the
potential rectifying effect is measured in the
Документ
Категория
Без категории
Просмотров
0
Размер файла
159 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа