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
s
s
s
s
APPLICATIONS
s
Noise figure measurement
Excess noise ratios (ENR): up to 20dB
Broad bandwidth
Excellent long term stability
Life up to 20,000 hours
AC, DC, or pulsed operation
SPECIFICATION RANGES
Parameter
Frequency
ENR
Operating Current
Starting Voltage
Range
0.2 - 220.0
8.8 - 20.1
30 - 250
0.9 - 7.0
Units
GHz
dB
mA
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
MICROWAVE NOISE TUBES & NOISE SOURCES
TD/TN Series
TD SERIES GAS DISCHARGE NOISE SOURCE TUBES
with Filamentary or Hollow Cathodes
All characteristics at 25˚C.
FREQUENCY
RANGE
(GHz)
1.12-1.70
(1.20-1.40 only)
BAND
WAVE-
GUIDE
PART # /
EIA TYPE
NUMBER
TD-21/6881
TD-29/7101
TD-33/7147
TD-49
TD-62/7992
TD-75
TD-91
TD-12/6358
TD-22/6782
TD-31
TD-32
TD-34/7148
TD-38/8151
TD-56/8286
TD-82
TD-24
TD-30
TD-10/6356
TD-39/7999
TD-43/8287
TD-48/7989
TD-83
TD-10/6356
TD-39/7999
TD-43/8287
TD-48/7989
TD-67/8288
TD-11/6357
TD-23/6882
TD-40/8152
TD-44/7988
TD-58/8293
TD-72/8059
TD-73
TD-93B
TD-114
TD-18/6684
TD-41/8030
TD-46
TD-54/7991
TD-55/8290
TD-92
TD-13/6359
TD-42/8031
TD-50/7990
TD-51/8291
TD-81
TD-76/7993
TD-77/8292
PACKAGE
OUTLINE
MOUNT
TYPE
RECOMMENDED
MODE OF
OPERATION
(1)
DC
AC,DC
AC,DC
pulse
DC
pulse
DC
DC
AC,DC
AC,DC
AC,DC
DC
pulse
pulse
DC
AC,DC
AC,DC
DC
pulse
pulse
DC
DC
DC
pulse
pulse
DC
pulse
DC
DC
pulse
pulse
pulse
pulse
DC
pulse
DC
DC
pulse
AC,DC
DC
pulse
pulse
pulse
DC
pulse
DC
DC
DC
pulse
MINIMUM
STARTING
VOLTAGE SPIKE
(kV)
L
WR-650
1
1a
1a
1
1
1
special
2
special
2a
2a
2
2
2
special
special
special
3
3
3
3
special
3
3
3
3
3
4
4
4
4
4
4
special
special
special
5
5
special
5
5
5
6
6
6
6
special
special
special
90°H
90°H
90°H
90°H
90°H
90°H
10°E
10°E
90°H
10°E
10°E
10°E
10°E
10°E
90°E
10°E
10°E
10°E
10°E
10°E
10°E
90°E
10°E
10°E
10°E
10°E
15°E
10°E
10°E
10°E
10°E
10°E
10°E
90°E
90°E
10°E
10°E
10°E
20°E
10°E
10°E
10°E
10°E
10°E
10°E
10°E
10°E
10°E
10°E
4.0
4.5
4.0
4.0
4.5
4.5
7.0
2.7
2.0
2.7
2.7
2.7
3.3
3.5
0.9
2.5
2.5
3.1
3.5
3.5
2.7
0.9
3.1
3.5
3.5
2.7
3.5
2.7
2.7
3.3
3.5
3.5
3.3
0.9
0.9
1.5
2.7
3.3
~1.2
2.7
3.5
3.5
2.7
3.3
2.7
3.5
3.3
2.7
3.0
DC ANODE
STARTING
CURRENT
(mA)
250
250
250
200
250
200
250
250
250
250
250
250
200
200
75
250
250
250
175
175
250
100
250
175
175
250
150
200
200
175
175
175
175
100
100
200
200
175
100
200
175
175
200
175
200
175
150
125
100
65
130
75
125
~145
235
230
80
45
90
170
160
145
265
55
60
110
70
140
210
135
55
75
140
210
135
225
75
115
125
205
208
133
54
165
90
70
130
35
130
230
125
68
125
157
260
148
130
175
TUBE DROP
(VDC)
TUBE-IN
MOUNT
ENR
(dB)
15.20
(2)
18.00
(2)
15.20
(2)
15.20
(2)
18.00
(2)
18.00
(2)
15.20
(2)
15.20
8.85
15.20
17.80
17.75
15.27
17.90
18
15.30
1
15.32
15.50
17.85
17.70
18.90
15.65
15.50
17.90
17.75
18.00
15.60
18.00
15.60
18.00
17.75
15.56
14.50
14.50
15.30
15.80
15.85
15.20
(2)
18.00
17.85
15.65
15.90
16.00
18.05
17.90
16.15
16.0
16.0
2.60-3.95
S
WR-284
3.30-4.90
3.95-5.85
S
C(G)
WR-229
WR-187
5.85-8.20
X(J)
WR-137
8.20-12.40
X
WR-90
12.40-18.00
Ku
WR-62
18.00-26.50
K
WR-42
26.50-40.00
(1)
Ka
WR-28
DC operation — cathode at one end only.
AC,DC operation — cathodes at both ends.
Pulse operation — cathode at one end specially designed for pulse operation. If the anode current during the “on” time of a square wavepulse (>100µs duration) is nominally the
same as the rated DC anode current, the tube drop during this period will be approximately the same as the rated DC tube drop.
(2)
Excess noise ratio of tube only.
North America: 1-800-CPCLARE
Europe: 32-11-300868
Asia: 886-2-2523-6368
Japan: 81-3-3980-2212
572
MICROWAVE NOISE TUBES & NOISE SOURCES
TD/TN Series
TD SERIES GAS DISCHARGE NOISE SOURCE TUBES
with Indirectly-Heated Cathodes
All characteristics at 25˚C.
FREQUENCY
RANGE
(GHZ)
3.4-3.6
2.9-3.1
2.7-2.9
8.2-12.4
BAND
PART NUMBER/
EIA TYPE
NUMBER
TD-124
TD-129
TD-121
TD-126
MINIMUM
STARTING
VOLTAGE
SPIKE (kV)
S
0.60
0.45
0.45
1.50
75
75
75
100
40
35
35
90
DC ANODE
CURRENT
(mA)
TUBE
DROP
(VDC)
TUBE-IN-
MOUNT
ENR
(dB)
18.30
18.50
18.50
15.6
TN-65
TN-71
TN-72
TN-130
USED IN
MOUNT
X
OUTLINE DRAWINGS (Noise Source Tubes with Filamentary or Hollow Cathodes)
C
A
0.74
±
0.08
(0.292
±
0.032)
0.24 TYP.
(0.097)
E
B
F
D
C
A
0.74
±
0.08
(0.292
±
0.032)
0.24 TYP.
(0.097)
E
B
ALT. - A
D
DIMENSION (INCHES)
OUTLINE NUMBER
1/1a
(3)
2/2a
(3)
3/3a
(3)
A
various
16.937-17.437
13.875-14.375
B
0.500 max
0.310-0.360
0.270-0.320
C
14.625-15.000
17.625-18.000
14.375-15.000
D
1.350-1.435
0.990 max
0.555 max
E
1.475-1.550
0.975-1.050
0.547-0.579
F
0.188 max
0.305-0.325
0.245-0.265
C
0.74
±
0.08
(0.292
±
0.032)
0.24 TYP.
(0.097)
0.48 MAX. DIA.
(0.188)
6.98 MAX.
(2.750)
E
D
A
1.27 MAX.
(0.500)
1.41 DIA. MAX.
(0.555)
DIMENSION (INCHES)
OUTLINE NUMBER
4
5
6
(3)
(4)
A
8.625 min
7.375 min
6.187 min
B
1.500 max
1.250 max
1.250 max
C
11.937-12.250
10.875-11.250
9.687-10.000
D
0.370-0.380
0.235-0.265
0.160-0.194
E
0.550 max
0.500 max
0.500 max
F
0.3804
0.2654
0.1944
The “a” suffix indicates using the bi-pin termination depicted in the inset labelled “ALT.-A”.
The diameter of the tube shall not exceed this value over the length of the tube denoted in the figure by “B”.
www.cpclare.com
573
MICROWAVE NOISE TUBES & NOISE SOURCES
TD/TN Series
TD SERIES GAS DISCHARGE NOISE SOURCE TUBES
with Indirectly-Heated Cathodes
(5)
All characteristics at 25˚C.
BAND
PART
NUMBER
FREQUENCY
RANGE
(GHz)
0.2-0.25
0.56-0.64
0.34-0.51
1.0-2.0
1.0-2.0
1.0-2.0
1.25-1.55
1.28-1.35
2.0-4.0
2.7-2.9
3.4-3.6
2.9-3.1
2.7-2.9
2.7-2.9
2.7-2.9
3.1-3.5
5.3-6.0
5.3-6.0
5.45-5.82
5.3-6.0
7.5-8.6
7.5-8.6
8.9-9.1
8.5-9.6
8.5-9.6
8.5-9.6
8.2-12.4
15.0-16.5
12.4-18.0
15.0-16.6
12.0-14.0
18.0-26.5
22.0-23.0
26.5-40.0
34.0-36.0
31.0-32.0
50.0-75.0
ENR
(dB)
TUBE
DROP
(VDC)
200
325
75
200
200
200
200
225
200
35
40
35
35
35
35
40
60
60
60
60
60
55
50
50
50
50
50
60
140
95
50
175
65
140
140
75
230
DC ANODE
CURRENT
(mA)
30
50
50
50
50
50
50
50
60
75
75
75
75
60
75
150
150
150
150
75
100
60
100
75
100
50
40
50
50
50
50
50
40
35
50
30
MINIMUM
STARTING
VOLTAGE
SPIKE (kV)
VHF
UHF
L
TN-46
TN-47
TN-48
TN-51
TN-52
TN-54
TN-55
TN-57
TN-60
TN-64
TN-65
TN-71
TN-72
TN-73
TN-74
TN-75
TN-76
TN-77
TN-78
TN-82
TN-83
TN-84
TN-94
TN-95
TN-97
TN-101
TN-124
TN-102
TN-103
TN-104
TN-128
TN-106
TN-125
TN-107
TN-109
TN-126
TN-111
18.5
20.3
18.5
20.1
20.1
20.5
20.1
20.5
18.5
18.5
18.3
18.5
18.5
18.5
18.5
18.3
18.5
13.5
18.5
13.5
18.5
15.0
18.5
14.5
18.5
14.5
12.5
18.5
18.5
12.3
13.5
18.5
12.5
18.0
18.0
13.3
18.0
1.5
2.0
2.0
1.9
1.9
1.9
1.9
1.9
1.9
0.45
0.6
0.45
0.45
0.45
0.45
0.6
0.7
0.7
0.7
0.7
0.8
0.8
0.95
0.95
0.95
0.95
1.00
1.2
2.0
1.0
1.0
1.9
1.5
2.5
2.5
1.5
2.5
15.50
16.5
10.0
8.94
10.38
17.31
9.56
12.56
10.38
3.75
2.50
3.63
3.09
3.09
3.75
2.63
2.00
3.50
2.75
3.56
1.56
2.50
1.63
2.50
1.63
2.25
2.50
1.50
7.50
1.63
2.00
6.44
2.25
5.13
7.38
2.25
4.63
Helical Coupling
Direct Coupling
Helical Coupling
Direct Coupling
Direct Coupling
Direct Coupling
Direct Coupling
Direct Coupling
Direct Coupling
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
90°E
0°E
90°E
90°E
0°E
90°E
0°E
0°E
90°E
0°E
7/8" coax
7/8" coax
Type N
7/8" coax
7/8" coax
Type N
7/8" coax
7/8" coax
7/8" coax
RG-75/U
RG-75/U
RG-75/U
RG-75/U
RG-75/U
RG-75/U
RG-75/U
RG-49/U
RG-49/U
RG-95/U
RG-49/U
RG-51/U
RG-51/U
RG-67/U
RG-67/U
RG-67/U
RG-52/U
RG-52/U
RG-67/U
RG-107/U
RG-91/U
RG-91/U
RG-66/U
RG-53/U
RG-96/U
RG-96/U
RG-96/U
RG-98/U
CIRCUIT
LENGTH
(INCHES)
MOUNTING
CIRCUIT
S
C
H
X
Ku(K)
K(P)
Ka(Q)
R
(5)
CP Clare can usually refurbish noise sources (depending on condition of waveguide) and install replacement tubes.
North America: 1-800-CPCLARE
Europe: 32-11-300868
Asia: 886-2-2523-6368
Japan: 81-3-3980-2212
574
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
NUMBER
(GHz)
FREQUENCY
RANGE
(dB)
APPROX.
ENR
(VDC)
TUBE
DROP
(mA)
DC ANODE
CURRENT
VOLTAGE
SPIKE (kV)
WR-42
WR-28
WR-22
WR-19
WR-15
WR-12
WR-10
WR-8
WR-6
WR-5
(5)
MINIMUM
STARTING
REPLACEMENT
TUBE
MOUNTING
MATE
FLANGE
TN-170
TN-162
TN-172
TN-163
TN-164
TN-171
TN-165
TN-167
TN-166A
TN-173
18.0-26.5
26.5-40.0
33.0-50.0
40.0-60.0
50.0-75.0
60.0-90.0
75.0-110.0
90.0-140.0
110.0-170.0
140.0-220.0
15.0
15.4
15.4
15.4
15.0
15.0
14.2
13.0
13.0
9.0
170
170
170
170
170
210
225
225
225
225
120
120
120
120
120
100
75
75
50
50
2.0
2.0
2.0
2.0
2.0
2.5
3.0
3.0
3.0
3.0
TD-170
TD-162
TD-172
TD-163
TD-164
TD-171
TD-165
TD-167
TD-166A
TD-173
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
7°E
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
CP Clare can usually refurbish noise sources (depending on condition of waveguide) and install replacement tubes.
NOISE SOURCE POWER SUPPLIES
with Current Regulation
PART NUMBER
FOR NOISE TUBES
(6)
AC INPUT
DC STARTING
VOLTAGE (kV)
PS-237
PS-238
PS-239
PS-240
(6)
DC OPERATING
CURRENT (mA)
150
150
120
75
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
These power supplies, though designed for the TN-162 through TN-173, are capable of operating many other noise sources made by CP Clare.
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