ENGINEERING BULLETIN
Sprague-Goodman
SG-670B
Supercedes SG-670A.1
MICROWAVE
TUNING ELEMENTS
METALLIC TUNING ELEMENTS
Metallic tuning ele-
ments have a metal
tuning rotor inside a
threaded mounting
bushing. A thread on
the rotor engages an
internal thread in the
bushing. The rotor
threads are slotted across their axis with
2 slots 180° apart. By compressing the
probe along its axis, the slots function as
a spring. The probe threads are pressed
firmly into flank-to-flank engagement
with the internal threads of the bushing,
eliminating backlash, while providing a
uniform adjustment torque that is self
locking.
Standard models are useful from 2 to 33
GHz. Metallic tuning elements can be
used to change the capacitive loading
within a waveguide, or any place a
metallic tuning probe is required.
MODEL NO.
GRMB30301SN
GRMB30302SN
A
B
C
D
E
F
G
H
0.135 0.120
3.43
3.43
3.43
3.43
GRMB50301SN
5.33
GRMB50604SN
5.33
5.33
6.78
6.78
GRMB70503SN
6.78
6.78
6.78
6.78
3.05
3.05
6.10
6.10
3.18
6.35
14.0
3.30
4.75
5.33
5.33
9.14
11.4
0.135 0.120
0.135 0.240
0.135 0.240
0.210 0.125
0.210 0.250
0.210 0.552
0.267 0.130
0.267 0.187
0.267 0.210
0.267 0.210
GRMB70505SN
GRMB70906SN
GRMB71109SN
0.267 0.360
0.267 0.450
0.030 0.156 0.072 0.002 0.035 0.120-80
0.76
1.9
1.9
3.76
0.58
3.76
11.4
0.64
2.69
2.69
4.57
6.48
8.76
3.96
3.96
3.96
3.96
5.59
5.59
5.59
7.11
7.11
7.11
7.11
7.11
7.11
1.8
1.8
0.072
1.8
1.8
3.18
3.18
3.18
4.06
4.06
4.06
4.06
4.06
4.06
0.05
1.2
0
0
0
0
0
0
0
0
0
0
0
0
0.58
0
0
1.9
0
0
0
0
0.89
0.89
0.035 0.120-80
0.89
0.035 0.120-80
0.89
0.037 0.190-64
0.94
0.037 0.190-64
0.94
0.042 0.190-64
1.1
0.035 0.234-64
0.89
0.79
0.035 0.234-64
0.89
0.89
0.145 0.234-64
3.68
0.240 0.234-64
6.10
0.075 0.156
0.075 0.156
0.072 0.047 0.035 0.120-80
GRMB30602SN
GRMB30604SN
0.148 0.156 0.072
0.023 0.220 0.125
0.148 0.220 0.125
0.450 0.220 0.125
0.025 0.280 0.160
GRMB51411SN
GRMB70301SN
GRMB70403SN
0.106 0.280 0.160 0.023 0.031 0.234-64
0.106 0.280 0.160
B
G
ADJUSTING SLOT
F
C AT MAX
TRAVEL
0.180 0.280 0.160 0.074 0.035 0.234-64
0.255 0.280 0.160
0.345 0.280 0.160
A
E
D
HEX NUT
"H" UNS-2 THD
0.04 X 0.04
OPTIONAL BUSHING SLOT
1
1
All dimensions are in
/
mm.
Custom sizes available.
Notes:
1. Gold plated brass bushings and chromated brass rotors in the sizes shown
above are standard. Other sizes and/or materials are available, contact
factory.
2. Hardware modifications:
2.1 For slotted bushing, replace “S” in model number by “L”.
2.2 For ring nut (instead of hex nut), replace “N” in model number by “R”.
2.3 For no nut, replace “N” by “F”.
3. Rotor adjusting slot is 0.060/1.5 x 0.016/0.41 for bushings where “H” is
0.120-80, 0.13/3.3 x 0.020/0.51 for bushings where “H” is 0.190-64, and
0.16/4.0 x 0.020/0.51 where “H” is 0.234-64.
Sprague-Goodman Electronics, Inc.
1700 SHAMES DRIVE, WESTBURY, NY 11590
TEL: 516-334-8700 • FAX: 516-334-8771
E-MAIL: info@spraguegoodman.com
MICROWAVE TUNING ELEMENTS
SG-670B
DIELECTRIC TUNING ELEMENTS
The use of a dielec-
tric rod (instead of a
metallic probe) for
the tuning element
will provide the low-
est loss tuning for
high frequency appli-
cations. When the
dielectric rod is intro-
duced into a microwave cavity it has the
effect of making the cavity electrically
larger, and lowering the resonant fre-
quency. Dielectric tuning elements are
excellent for adjusting the frequency of
Gunn diode and IMPATT oscillators.
MODEL NO.
GRDA70913SN
GRDQ30604SN
GRDS30604SN
GRDS70503SN
GRDS70907SN
A
B
C
D
E
F
G
H
0.267 0.629 0.280
6.78
3.43
3.43
6.78
6.78
16.0
6.60
6.60
5.56
9.37
7.11
4.06
4.06
7.11
7.11
0.135 0.260 0.160
0.135 0.260 0.160
0.267 0.219 0.280
0.267 0.369 0.280
0.359 0.525
9.12
6.10
6.10
5.33
9.12
13.3
4.27
4.27
2.92
6.73
0.240 0.168
0.240 0.168
0.210 0.115
0.359 0.265
0.152 0.215 0.234-64
3.86
1.6
1.6
3.86
3.86
5.46
5.21
5.21
4.45
5.46
0.062 0.205 0.120-80
0.062 0.205 0.120-80
0.152 0.175 0.234-64
0.152 0.215 0.234-64
Note:
For hardware modifications and adjusting slot sizes see notes on
page 1.
ADJUSTING
SLOT
B
D
G
A
F
MODEL NO.
C
HEX NUT
"H" UNS-2 THD
0.04 X 0.04
OPTIONAL BUSHING SLOT
1
1
A
B
C
D
E
F
E AT MAX
TRAVEL
ROD
MATERIAL THREAD-2A
Alumina
Alumina
Alumina
Alumina
Alumina
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Quartz
Sapphire
0.94-80UNS
0.190-64UNS
0.190-64UNS
0.190-64UNS
0.190-64UNS
0.060-80UNF
0.094-80UNS
0.094-80UNS
0.086-56UNC
0.094-80UNS
0.094-80UNS
0.156-64UNS
0.190-64UNS
0.375-64UNS
0.375-64UNS
0.094-80UNS
GREA21712
GREA41108
0.062 0.674 0.490 0.020 0.016 0.060
1.6
3.86
3.86
3.86
3.86
1.0
1.8
1.8
1.5
1.8
1.8
3.18
4.06
8.76
8.13
1.6
17.1
10.9
12.1
15.9
22.5
12.7
3.10
4.19
5.46
5.46
6.02
6.35
14.1
9.40
16.6
7.62
12.4
7.62
8.76
12.6
19.1
9.78
0.76
1.9
2.54
3.18
3.73
3.76
11.4
3.81
9.45
4.52
0.51
0.25
0.25
0.25
0.25
0.51
0.51
0.51
0.51
0.51
0.51
0.25
0.25
0.76
0.76
0.51
0.41
0.51
0.51
0.51
0.51
0.41
0.41
0.41
0.41
0.41
0.41
0.51
0.51
1.52
1.52
0.41
1.5
3.68
3.68
3.68
3.68
1.0
1.5
1.5
1.5
1.5
1.5
3.05
3.68
8.13
8.13
1.5
0.152 0.430 0.300 0.010 0.020 0.145
0.152 0.475 0.345 0.010 0.020 0.145
0.152 0.625 0.495 0.010 0.020 0.145
0.152 0.884 0.750 0.010 0.020 0.145
0.040 0.500 0.385 0.020 0.016 0.040
0.072 0.122 0.030 0.020 0.016 0.060
0.072 0.165 0.075 0.020 0.016 0.060
All dimensions are in
/
mm.
Custom sizes available.
GREA41209
GREA41613
TUNING ROTORS
Metallic and dielec-
tric tuning rotors are
available for applica-
tions in which the
user wishes to pro-
vide threads in his
structure (instead of
using a bushing).
GREA42319
GREB11310
GREB20301
GREB20402
GREB20503
B
D
METAL
0.060 0.215 0.100 0.020 0.016 0.060
0.072 0.215 0.125 0.020 0.016 0.060
GREB20603
A
GREB20604
ADJUSTING
SLOT "E" x "F"
C
0.072 0.237 0.147 0.020 0.016 0.060
0.125 0.250 0.148 0.010 0.020 0.120
GREB30604
B
D
DIELECTRIC
ROD
A
0.160 0.554 0.450 0.010 0.020 0.145
GREB41411
GREB90904
GREQ81709
GRES20805
0.345 0.370 0.150 0.030 0.060 0.320
0.320 0.652 0.372 0.030 0.060 0.320
0.062 0.300 0.178 0.020 0.016 0.060
ADJUSTING
SLOT "E" x "F"
C
All dimensions are in
/
mm.
Custom sizes available.
2
SPRAGUE-GOODMAN ELECTRONICS, INC., 1700 SHAMES DRIVE, WESTBURY, NY 11590 • TEL: 516-334-8700 • FAX: 516-334-8771
MICROWAVE TUNING ELEMENTS
SG-670B
DIELECTRIC RESONATOR
TUNERS
Specifically
designed for
tuning dielec-
tric resonator
oscillators and
filters, the rotor
of these
devices varies the distance
between a tuning disk or rod of
various materials and a dielectric
resonator “puck”. Standard mod-
els are compatible with a wide
variety of puck diameters and
mounting configurations, and
operate in the frequency range of
2 to 18 GHz.
MODEL NO.
GRRB70504SN04
GRRB70504SN05
GRRB70504SN06
A
0.267
6.78
0.267
6.78
0.267
6.78
0.267
B
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.360
9.14
0.360
9.14
0.360
9.14
0.360
9.14
0.360
9.14
0.360
9.14
0.360
9.14
0.360
9.14
0.450
11.4
0.450
11.4
0.450
11.4
0.450
11.4
0.450
11.4
0.450
11.4
0.450
11.4
0.450
11.4
C
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
D
0.16
4.1
0.20
5.1
0.25
6.4
0.30
7.6
0.35
8.9
0.40
10
0.45
11
0.50
13
0.16
4.1
0.20
5.1
0.25
6.4
0.30
7.6
0.35
8.9
0.40
10
0.45
11
0.50
13
0.16
4.1
0.20
5.1
0.25
6.4
0.30
7.6
0.35
8.9
0.40
10
0.45
11
0.50
13
E
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
0.16
4.1
F
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
0.234-64
G
0.175
4.45
0.175
4.45
0.175
4.45
0.175
4.45
0.175
4.45
0.175
4.45
0.175
4.45
0.175
4.45
0.215
5.46
0.215
5.46
0.215
5.46
0.215
5.46
0.215
5.46
0.215
5.46
0.215
5.46
0.215
5.46
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
0.210
5.33
3
GRRB70504SN08
GRRB70504SN09
GRRB70504SN10
GRRB70504SN11
GRRB70504SN13
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
0.267
6.78
C AT MAX
TRAVEL
0.020
0.51
B
G
GRRB70904SN04
GRRB70904SN05
E
A D
GRRB70904SN06
"F" UNS-2 THD
GRRB70904SN08
All dimensions are in
/
mm.
Custom sizes available.
Notes:
1. Gold plated brass bushings and
chromated brass rotors in the sizes
shown above are standard. Other
sizes and/or materials are available,
contact factory.
2. Hardware modifications:
2.1 For 0.04/1 x 0.04/1 slotted bush-
ing, substitute “L” for “S” in model
number.
2.2 For ring nut (instead of hex nut),
replace “N” in model number
by “R”.
2.3 For no nut, replace “N” by “F”.
2.4 To add seal cap, add “C” at the
end of the model number for a
seal cap without a slot, and “B”
for a seal cap with a screw driver
slot.
3. Rotor adjusting slot is 0.16/4.0 x
0.020/0.51.
GRRB70904SN09
GRRB70904SN10
GRRB70904SN11
GRRB70904SN13
GRRB71104SN04
GRRB71104SN05
GRRB71104SN06
GRRB71104SN08
GRRB71104SN09
GRRB71104SN10
GRRB71104SN11
GRRB71104SN13
SPRAGUE-GOODMAN ELECTRONICS, INC., 1700 SHAMES DRIVE, WESTBURY, NY 11590 • TEL: 516-334-8700 • FAX: 516-334-8771
MICROWAVE TUNING ELEMENTS
SG-670B
LC TUNING ELEMENTS
Variations of the stan-
dard metallic units,
LC tuning elements
are designed specifi-
cally for filter applica-
tions. These devices
provide a fixed post
length which is
extended by rotating the metallic rotor.
A typical application is a direct-coupled
TEM mode coaxial configuration. The
post length is selected to cover the
desired range. A circuit is designed
around the tunable post so that each
section approximates 76 ohms for opti-
mum resonator Q and high selectivity.
MODEL NO.
GRFB50503SF
GRFB50904SF
GRFB51204SF
GRFB51504SF
GRFB71411SF
GRFB71806SF
GRFB72211SF
A
B
C
D
E
F
G
H
0.187 0.195
4.75
4.75
4.75
4.75
6.73
7.14
6.73
4.95
9.02
12.2
15.3
14.1
17.8
22.4
25.40
31.3
40.18
0.187 0.355
0.187 0.482
0.187 0.602
0.265 0.557
0.281 0.700
0.265 0.882
0.281 1.000
7.14
0.281 1.232
7.14
0.281 1.582
7.14
0.108 0.102 0.072 0.152 0.156-64 0.005
2.74
3.76
3.76
3.76
11.4
6.35
11.4
6.35
8.79
8.79
3.05
3.05
3.05
3.05
4.32
5.33
4.32
5.33
5.33
5.33
1.8
1.8
1.8
1.8
3.18
4.06
3.18
4.06
4.06
4.06
3.86
5.89
5.89
3.86
5.89
5.89
5.89
5.89
5.89
5.89
0.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.148 0.120 0.072 0.232 0.156-64
0.148 0.120 0.072 0.232 0.156-64
0.148 0.120 0.072 0.152 0.156-64
0.450 0.170 0.125 0.232 0.234-64
0.250 0.210 0.160 0.232 0.250-64
0.450 0.170 0.125 0.232 0.234-64
0.250 0.210 0.160 0.232 0.250-64
0.346 0.210 0.160 0.232 0.250-64
0.346 0.210 0.160 0.232 0.250-64
B
0.047
1.2
H
C AT MAX
TRAVEL
GRFB72506SF
GRFB73109SF
GRFB74009SF
ADJUSTING
SLOT
E
D
A
F
"G" UNS-2 THD
OPTIONAL BUSHING SLOT 0.04 X 0.04
1
1
All dimensions are in
/
mm.
Custom sizes available.
Notes:
1. For slotted bushing, replace “S” in model number by “L”.
2. To include a mating nut on the bushing, replace final “F” in the model
number by “N” for a hex nut, or by “R” for a ring nut.
RESISTIVE TUNING ELEMENTS
The use of a lossy rod
material for the rotor
of the tuning element
provides a conve-
nient and effective
means of trimming
the microwave
device in a wave-
guide or cavity. The amount of power
absorbed is a function of the depth of
insertion of the rod into the waveguide
or cavity. Standard models are ideal for
frequencies of 1 to 18 GHz.
B
G
ADJUSTING SLOT
F
C AT MAX
TRAVEL
MODEL NO.
GRLE30603SN
GRLE30604SN
A
0.135
3.43
0.135
3.43
0.267
6.78
B
C
D
E
0.078
2.0
1.6
0.152
3.86
F
0
0
0.51
0
0
G
H
0.240 0.130 0.160
6.10
6.10
9.12
3.30
4.27
6.35
4.06
4.06
7.11
0.240 0.168 0.160
0.359 0.250 0.280
0.035 0.120-80
0.89
0.89
0.144 0.234-64
3.66
0.062 0.020 0.035 0.120-80
GRLE70906SN
Note:
For hardware modifications and adjusting slot sizes see notes on
page 1.
A
E
D
HEX NUT
"H" UNS-2 THD
0.04 X 0.04
OPTIONAL BUSHING SLOT
1
1
All dimensions are in
/
mm.
Custom sizes available.
SPRAGUE-GOODMAN ELECTRONICS, INC., 1700 SHAMES DRIVE, WESTBURY, NY 11590 • TEL: 516-334-8700 • FAX: 516-334-8771
4
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