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Патент USA US3069634

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Dec. 18, 1962
.
3,069,624
D- S. FRIEDMAN
AUTOMATIC POWER TRIP SWITCH FOR A TRANSMITTER
HAVING HIGH REFLECTIVE POWER
F11>ed March 14, 1961
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TRANSMITTER
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LOW LEVEL PULSE
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SWITCH
TUBE
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ISOLATION
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“DELAY
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35
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PULSER
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GENERATOR
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THYRATRON
AMP.
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DETECTOR
To AMP 32
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LIMITER
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DAVID
INVENTOR.
s. FRIEDM N
BY DUW
ATTQ’ENEYs
grates atent
3,659,624
1
2
3,069,624
the load 20, and coupled to line 26 via coupler 24. Since
this signal is much weaker than the main pulse, and since
AUTQMA'HC PGWER TREE’ SWETQH FUR A TRANS
MITTER HAVTNG HEGH REFLE€THVE PGWER
David S. Friedman, Nutiey, NJ, assignor, by mesne as
i
{lice
,
Patented Dec. 18, 1962
trigger circuit #1 is loosely coupled to line 26, tap #1 is
insensitive'to the monitor pulse, but tap #2 will be ac
tivated by this pulse in the presence of large re?ections.
signments, to the United States of America as repre
Should the monitor pulse fail to activate the trip switch,
sented by the Secretary of the Air Force
the main pulse will be transmitted, and a portion thereof
Filed Mar. 14, 1961, Set‘. No. 95,750
will eventually enter line 26 via re?ections from load 20
4 Siaims. (Cl. 325—151)
and coupler 24. The design is such that the TR tube
The invention relates to a protective device for a high 10 will ?re, protecting the detector in tap #2 from burn-out
due to excessive power. This signal, much stronger than
power microwave source, and more particularly a switch
that from the monitor pulse, will activate the trip switch
which is capable of anticipating high re?ected power and
via trigger circuit #1.
turning off the microwave source before the high power
The re?ected power pulses from taps #1 and #2 are
pulse is transmitted.
There occasionally occurs in the operation of a trans 15 applied to ampli?er 32. The ampli?er output pulse is
in turn applied to radio frequency fault thyratron 34.
mitter and antenna combination the condition in which
Under normal operation, where the re?ected power pulse
the impedance of the transmitter does not match or equal
is low, the thyratron Will, not ionize and the isolation am
the impedance of the antenna or connected load. The
pli?er plate voltage will remain at the high positive value
result is re?ected power which, if in su?icient magnitude,
set by voltage source 36 and resistance 35. However,
is harmful to the transmitter.
if the pulse is of su?icient amplitude that such re?ected
It is thus an object of this invention to provide a pro
power pulses would be harmful to the, transmitter, the
tective device for a high power microwave source capable
thyratron 34 ?res dropping the plate voltage of the isola
of anticipating high re?ected power and turning off the
tion' ampli?er to very close to ground potential. Loss of
source.
It is the speci?c object of this invention to provide a 25 this voltage disables the isolation ampli?enthlus stopping
the conduction of the switch [tube 40 and the supply of
system wherein a low power test pulse is transmitted be
high voltage to the transmitter 10. The thyratron is cut
fore the transmission of a high power pulse and employ
oifand the circuit brought back to normal operation by
ing the low power test pulse to prevent the transmission of
means-of reset switch 38.
the high power pulse in the event that the low power
FIGURE 2 illustrates another possible embodiment of
pulse indicates excessive re?ection power.
the same principle. Re?ected power from load 2% again
Other objects, novel features, and advantages of this
enters line-26 via' coupler 24.‘ ‘ Tap #1 is loosely coupled
invention, will become apparent upon consideration of
to line 26 via coupler 25, and is again insensitive to the
the embodiments illustrated in the accompanying draw
monitor pulse. The monitor pulse will activate detector
ings and hereinafter to be described.
#2, as before, while the main pulse activates detector
In the drawing:
#1, as before.
The TR tube again protects detector
FIGURE 1 is a schematic of an embodiment of the
#2 against burn-out.
_
novel automatic power trip switch;
Still another possible embodiment is shown in FIG
FIGURE 2 is an illustration of a modi?cation of the
URE 3, which requires the use of only one detector 52.
'FEGURE 1 switch; and
FEGURE 3 is an illustration of a second modi?cation of 40 The limiter 50 will sharply attenuate high level signals,
but transmits low level signals with substantially no loss.
the FIGURE 1 switch.
Thus the monitor signal will pass unaffected through the
As shown in FIGURE 1, the input signal from the
limiter while the main pulse signal is sharply attenuated.
transmitter 10 consists of two pulses. The earlier pulse
The detector is thus sensitive to both signals, while the
is injected into the system by a low power test pulse trans
mitting means or low level pulse generator 12. A syn 45 limiter protects it from being burnt out by the high level
signal.
chronizing signal generator or pulser 14 initiates the two
The anticipatory circuit keeps the transmitter from
pulses by triggering the low level pulse generator im
operating into a harmful environment under most con
mediately and subsequently triggering the transmitter 10
ditions. However, if for any reason the low-level signal
after a short delay in delay line 16. The delayed pulse
is applied to switch tube 40, through the isolation ampli— 50 failed to turn o?f the source, the re?ected main pulse
would accomplish the desired result.
?er 42 causing the conduction of the switch tube 40.
The invention is not intended to be limited to the ex
The conduction of switch tube 40 through pulse trans
amples of embodiments shown and described but may,
former 44 supplies the klystron high voltage to the
transmitter 10.
The main transmission line 18, which can be a wave
on the contrary, be capable of many modi?cations without
55 departing from the spirit of the invention.
I claim:
guide as illustrated in the drawing, carries both pulses to
1. An automatic power trip switch for preventing an
the antenna or load 20. The low level pulse enters the
ticipated high re?ective power from an antenna to its
main transmission line at a ?rst directional coupler 22
transmitter from reaching the transmitter comprising
constructed such that the energy ?ow from the low pulse
generator will be directed toward the load 20. A second 60 means for applying power to said transmitter, a main
transmission line between said transmitter and said an
directional coupler 24 is located in the main transmission
tenna, means for transmitting a low power test pulse
line between the ?rst directional coupler and the antenna
through said main transmission line at a predetermined
for coupling the main transmission line 18 with branch
time
prior to the transmission of each high power pulse
transmission line 26. The second directional coupler is
from the said transmitter, and means responsive to ex
constructed such that only re?ected energy coming from
cessive re?ected power from said low power test pulse
the antenna 2% will ?ow into the branch transmission
for turning off said power applying means thereby pre
line 26.
venting the transmission of a high power pulse.
The FIGURE 1 circuit is designed so that the detector
2. An automatic power trip switch for preventing an
in trigger circuit #1 is very loosely coupled to branch line 70 ticipated high re?ective power from an antenna, to its
26, while diode #2 is strongly coupled thereto. A por
transmitter from reaching the transmitter comprising
tion of the low level monitor pulse is ?rst re?ected from
means for applying power to said transmitter, a low level
3
3,669,624
pulse generator having its output coupled to said antenna
through ?rst and second directional couplers being posi
4
pulse from reaching said second tap and allowing the re
ing signal generator having its output coupled to said
pulse generator and said transmitter through a delay line,
?ected power from the low level pulse to reach said second
tap, and means connected to said taps for turning off
said power applying means when a pulse is re?ected to
the extent that if the transmitter were to operate in this
environment the re?ections would be harmful to the said
a branch transmission line connected to said second di
transmitter. '
tioned in the order named in the main transmission line s
between said transmitter and said antenna, a synchroniz
rectional coupler, said second directional coupler being
constructed such that only re?ections from said antenna
4. An automatic power trip switch for preventing an
ticipated high reflective power from an antenna to its
will pass through said branch transmission line, and means 10 transmitter from reaching the transmitter comprising
for sampling said re?ections in said branch transmission
means for applying power to said transmitter, a low level
line and for turning off said power’ applying means when
pulse generator having its output coupled to said antenna
the low level pulse is re?ected to the extent that if the
through ?rst and second directional couplers, said direc
transmitter were to operate in this environment the re
tional couplers being positioned in the order named in
?ections would be harmful to the said transmitter.
15 the main transmission line between said transmitter and
3. An automatic power trip switch for preventing an
said antenna, a synchronizing signal generator having its
ticipated high re?ective power from an antenna to its
output coupled to said pulse generator and said trans
transmitter from reaching the transmitter comprising
mitter through a delay line, a branch transmission-line
means for applying power to said transmitter, 21 low level
connected to said main transmission line at said second
pulse generator having its output coupled to said antenna 20 directional coupler, said second directional coupler being
through ?rst and second directional couplers, said direc
constructed such that only re?ections from said antenna
tional couplers being positioned in the order named in
will pass through said branch transmission line, a limiter
the main transmission line between said transmitter and
connected to said branch transmission line for sharply
said antenna, a synchronizing signal generator having its
‘attenuating high re?ective power pulses and transmitting
output coupled to said pulse vgenerator and said trans 25 low level pulses with substantially no loss, and means
mitter through a delay line, a branch transmission line
connected to said limiter for turning o? said power apply
having first and second taps in the order named from the
ing means when a pulse is re?ected to the extent that if
said main transmission line connected to said main trans
the transmitter were to operate in this environment the re
mission line at‘said second directional coupler, said second
?ections would be harmful to the said transmitter.
directional coupler being constructed such that only re 30
?ections from said antenna will pass through said branch
References Cited in the ?le of this patent
transmission line, said ?rst tap being loosely coupled to
UNITED STATES PATENTS
said branch transmission line, a transmit-receive switch
positioned in said branch transmission line between said
Spencer ______________ __ Feb. 28, 19505
2,498,719
taps for preventing the re?ected power from the main 35 2,679,595
Spencer ______________ _._ May 25, 1954
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