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What is TD-7991?

This electronic component, produced by the manufacturer "Clare", performs the same function as "MICROWAVE NOISE TUBES & NOISE SOURCES".


TD-7991 Datasheet PDF - Clare

Part Number TD-7991
Description MICROWAVE NOISE TUBES & NOISE SOURCES
Manufacturers Clare 
Logo Clare Logo 


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MICROWAVE NOISE TUBES & NOISE SOURCES
TD/TN Series
DESCRIPTION
CP Clare’s TD Series of gas discharge microwave noise tubes and TN Series of gas discharge microwave noise
sources are the element in a microwave RF system that allows accurate measurements of the noise figure of the
receiver or its components. The requirements of a device used for making such noise figure measurements
include broad bandwidth inherent in the active element, stability, ease of operation, and long life. In general, the
range of usefulness of these noise sources permits measurements of noise figures from about 2 to 30dB. The
PS-237 through PS-240 current-regulated power supplies can be used to operate many of the noise sources
described herein.
FEATURES
s Excess noise ratios (ENR): up to 20dB
s Broad bandwidth
s Excellent long term stability
s Life up to 20,000 hours
s AC, DC, or pulsed operation
APPLICATIONS
s Noise figure measurement
SPECIFICATION RANGES
Parameter
Range
Units
Frequency
0.2 - 220.0
GHz
ENR
8.8 - 20.1
dB
Operating Current
30 - 250
mA
Starting Voltage
0.9 - 7.0
kV
(See detailed specifications for more data. Contact CP Clare for TD and TN part numbers or for other
requirements not listed.)
www.cpclare.com
571

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TD-7991 equivalent
MICROWAVE NOISE TUBES & NOISE SOURCES
TD/TN Series
TD SERIES GAS DISCHARGE NOISE SOURCE TUBES
with Filamentary Cathode Noise Tubes(5)
All characteristics at 25˚C
WAVE-GUIDE PART
FREQUENCY APPROX. TUBE DC ANODE MINIMUM
NUMBER
RANGE
ENR DROP CURRENT STARTING
(GHz)
(dB)
(VDC)
(mA) VOLTAGE
SPIKE (kV)
WR-42
TN-170
18.0-26.5
15.0 170
120
2.0
WR-28
WR-22
TN-162
TN-172
26.5-40.0
33.0-50.0
15.4 170
15.4 170
120
120
2.0
2.0
WR-19
TN-163
40.0-60.0
15.4 170
120
2.0
WR-15
TN-164
50.0-75.0
15.0 170
120
2.0
WR-12
TN-171
60.0-90.0
15.0 210
100
2.5
WR-10
WR-8
TN-165
TN-167
75.0-110.0
90.0-140.0
14.2 225
13.0 225
75
75
3.0
3.0
WR-6
TN-166A
110.0-170.0
13.0 225
50
3.0
WR-5
TN-173
140.0-220.0
9.0 225
50
3.0
(5) CP Clare can usually refurbish noise sources (depending on condition of waveguide) and install replacement tubes.
REPLACEMENT
TUBE
TD-170
TD-162
TD-172
TD-163
TD-164
TD-171
TD-165
TD-167
TD-166A
TD-173
MOUNTING
MATE
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
FLANGE
UG-595/U
UG-599/U
UG-599/U
UG-385/U
UG-385/U
UG-385/U
UG-385/U
UG-385/U
UG-385/U
UG-385/U
NOISE SOURCE POWER SUPPLIES
with Current Regulation
PART NUMBER
FOR NOISE TUBES(6)
AC INPUT
DC STARTING
VOLTAGE (kV)
DC OPERATING
CURRENT (mA)
PS-237
PS-238
PS-239
PS-240
TN-162 thru TN-172
except TN-166A
TN-173, TN-166A
115VAC, 60Hz
220VAC, 50Hz
115VAC, 60Hz
220VAC, 50Hz
5.0
5.0
5.0
5.0
(6)These power supplies, though designed for the TN-162 through TN-173, are capable of operating many other noise sources made by CP Clare.
150
150
120
75
ORDERING INFORMATION
A complete part number is represented by
the information in the Part Number column
of the specification table.
www.cpclare.com
575


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Featured Datasheets

Part NumberDescriptionMFRS
TD-7990The function is MICROWAVE NOISE TUBES & NOISE SOURCES. ClareClare
TD-7991The function is MICROWAVE NOISE TUBES & NOISE SOURCES. ClareClare
TD-7992The function is MICROWAVE NOISE TUBES & NOISE SOURCES. ClareClare

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