Welcome to Standex Electronicsa Standex Company
 

 

RF Variable Inductors
Series 308, 932, 408 & 933

RF Variable Inductor

Dimensions DividerElectrical Specifications DividerNotes


Series 308, 932, 408 & 933 Dimensions
Top of Page

Electrical Specifications - Series 308, 932, 408 & 933

Series 308 & 408 with 10-32 Carbonyl J Core

Series 308 is tappable. Contact the factory for more information.

Part Number * Inductance µH Q
 
Tapped		  
Untapped		 Suggested
Core		  
Min ± 5%		  
Max ± 10%		  
Min L		  
Max L
30801 40801 J4 0.046 0.053 113 119
30802 40802 J4 0.080 0.098 148 150
30803 40803 J4 0.120 0.160 168 163
30804 40804 J4 0.168 0.226 184 176
30805 40805 J4 0.216 0.290 196 181
30806 40806 J4 0.268 0.373 210 187
30807 40807 J4 0.324 0.446 214 185

* Part Number includes Core


Top of Page

Series 932 & 933 with 1/4" diameter Carbonyl J Core

Series 932 is tappable. Contact the factory for more information.

Part Number * Inductance µH Q
 
Tapped		  
Untapped		 Suggested
Core		  
Min ± 5%		  
Max ± 10%		  
Min L		  
Max L
93201 93301 J4 0.045 0.058 108 122
93202 93302 J4 0.079 0.114 146 159
93203 93303 J4 0.120 0.188 170 176
93204 93304 J4 0.169 0.270 185 183
93205 93305 J4 0.217 0.366 199 185
93206 93306 J4 0.270 0.450 207 186
93207 93307 J4 0.320 0.550 217 182

* Part Number includes Core


Top of Page

Series 308 & 408 with 10-32 Carbonyl E Core

Series 308 is tappable. Contact the factory for more information.

Part Number * Inductance µH Q
 
Tapped		  
Untapped		 Suggested
Core		  
Min ± 5%		  
Max ± 10%		  
Min L		  
Max L
30801 40801 E4 0.046 0.054 113 113
30802 40802 E4 0.080 0.102 148 134
30803 40803 E4 0.120 0.170 168 142
30804 40804 E4 0.168 0.240 184 152
30805 40805 E4 0.216 0.315 196 154
30806 40806 E4 0.268 0.400 210 154
30807 40807 E4 0.324 0.480 214 152

* Part Number includes Core


Top of Page
Series 932 & 933 with 1/4" diameter Carbonyl E Core

Series 932 is tappable. Contact the factory for more information.

Part Number * Inductance µH Q
 
Tapped		  
Untapped		 Suggested
Core		  
Min ± 5%		  
Max ± 10%		  
Min L		  
Max L
93201 93301 E4 0.045 0.062 108 116
93202 93302 E4 0.079 0.123 146 139
93203 93303 E4 0.120 0.200 170 148
93204 93304 E4 0.169 0.300 185 150
93205 93305 E4 0.217 0.400 199 148
93206 93306 E4 0.270 0.500 207 145
93207 93307 E4 0.322 0.610 217 142

* Part Number includes Core


Top of Page

Notes - Series 308, 932, 408 & 933

  1. Minimum inductance is measured with the core halfway out of the coil form.

  2. Carbonyl E & J material cores are available 1/4", 5/16", 3/8" and 1/2" long for series 308 & 408; 1/4", 3/8" and 1/2" long for series 932 & 933.. Aluminum cores are available 5/16" long only for series 308 & 408; 1/4" long only for series 932 & 933. The electrical measurements shown were made with a 3/8" long, carbonyl "E" or "J" core, as noted. Other core lengths and materials are available. Outside diameter and thread of the cores used in series 932 and 933 is 1/4" x 28. Series 308 and 408 use a 10-32 core.

  3. Electrical winding taps are available on series 308 and 932.

  4. Windings for series 308, 408, 932 and 933 are 20 TPI have an O.D. of .391", and are .065" from the mounting surface to the first turn.

  5. The short "shoulder" indicates the start lead.

  6. Series 308 or 408 may be tuned with Standex tuning wrenches 55, 95, 302 or 764. Series 932 or 933 may be tuned with Standex tuning wrench numbers 95 or 764.

  7. Coil form material is polypropylene.

  8. Standex specifications are subject to change without notice.