MODEL NO.
A
B
C
D
E
F
G
H
GRMB30301SN
GRMB30302SN
GRMB30602SN
GRMB30604SN
GRMB50301SN
GRMB50604SN
GRMB51411SN
GRMB70301SN
GRMB70403SN
GRMB70503SN
GRMB70505SN
GRMB70906SN
GRMB71109SN
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.
Sprague-Goodman Electronics, Inc.
1700 SHAMES DRIVE, WESTBURY, NY 11590
TEL: 516-334-8700 • FAX: 516-334-8771
E-MAIL: info@spraguegoodman.com
Sprague-Goodman
MICROWAVE
TUNING ELEMENTS
ENGINEERING BULLETIN
SG-670B
Supercedes SG-670A.1
0.135 0.120
0.030 0.156
0.072 0.002
0.035 0.120-80
3.43
3.05
0.76
3.96
1.8
0.05
0.89
0.135 0.120
0.075
0.156
0.072 0.047
0.035 0.120-80
3.43
3.05
1.9
3.96
1.8
1.2
0.89
0.135 0.240
0.075
0.156
0.072
0
0.035 0.120-80
3.43
6.10
1.9
3.96
1.8
0
0.89
0.135 0.240
0.148 0.156
0.072
0
0.035 0.120-80
3.43
6.10
3.76
3.96
1.8
0
0.89
0.210 0.125
0.023 0.220
0.125
0
0.037 0.190-64
5.33
3.18
0.58
5.59
3.18
0
0.94
0.210 0.250
0.148 0.220
0.125
0
0.037 0.190-64
5.33
6.35
3.76
5.59
3.18
0
0.94
0.210 0.552
0.450 0.220
0.125
0
0.042 0.190-64
5.33
14.0
11.4
5.59
3.18
0
1.1
0.267 0.130
0.025 0.280
0.160
0
0.035 0.234-64
6.78
3.30
0.64
7.11
4.06
0
0.89
0.267 0.187
0.106 0.280
0.160 0.023
0.031 0.234-64
6.78
4.75
2.69
7.11
4.06
0.58
0.79
0.267 0.210
0.106 0.280
0.160
0
0.035 0.234-64
6.78
5.33
2.69
7.11
4.06
0
0.89
0.267 0.210
0.180 0.280
0.160 0.074
0.035 0.234-64
6.78
5.33
4.57
7.11
4.06
1.9
0.89
0.267 0.360
0.255 0.280
0.160
0
0.145 0.234-64
6.78
9.14
6.48
7.11
4.06
0
3.68
0.267 0.450
0.345 0.280
0.160
0
0.240 0.234-64
6.78
11.4
8.76
7.11
4.06
0
6.10
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.
A
B
GF
C AT MAX
TRAVEL
E
"H" UNS-2 THD
D
HEX NUT
ADJUSTING SLOT
OPTIONAL BUSHING SLOT
0.04
1
0.04
1
X
All dimensions are in / mm.
Custom sizes available.
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