Welcome to Standex Electronicsa Standex Company
 

 

RF Variable Inductors
Series 929, 138 & 928

Variable Inductors

Dimensions DividerElectrical Specifications DividerNotes


Series 929, 138 & 928 Dimensions

Top of Page

Electrical Specifications - Series 929, 138 & 928

Series 929, 138 & 928 with Carbonyl J Core

Series 138 is tappable in two locations. Series 928 is tappable in six locations.
Contact the factory for more information.

Part Number * Inductance µH Q Test
Freq.
MHz
Suggested
Core		  
Minimum		  
Maximum		 At
Min L		 At
Max L
92901  J4   0.043 0.052 90 104 40
92902  J4   0.061 0.086 113 127 40
92903  J4   0.084 0.128 128 140 40
92904  J4   0.110 0.176 115 144 25
92905  J4   0.137 0.225 122 150 25
92906  J4   0.164 0.269 131 154 25
92907  J4   0.200 0.310 141 156 25
92908  J4   0.242 0.346 149 158 25
92909  J4   0.289 0.384 158 160 25 

 * Part Number includes Core

   The part number shown is for series 929.  To specify  
   series 138 or 928, change the 929 in the part number to 
   the desired series number.

Top of Page

Series 929, 138 & 928 with Carbonyl E Core

Series 138 is tappable in two locations. Series 928 is tappable in six locations.
Contact the factory for more information.

Part Number * Inductance µH Q Test
Freq.
MHz
Suggested
Core		  
Minimum		  
Maximum		 At
Min L		 At
Max L
92901  E4   0.043 0.054 94 98 40
92902  E4   0.061 0.093 113 114 40
92903  E4   0.085 0.143 131 122 40
92904  E4   0.110 0.194 116 140 25
92905  E4   0.137 0.245 124 145 25
92906  E4   0.164 0.295 134 148 25
92907  E4   0.202 0.340 144 148 25
92908  E4   0.249 0.379 153 149 25
92909  E4   0.304 0.419 159 152 25 
 * Part Number includes Core

   The part number shown is for series 929.  To specify  
   series 138 or 928, change the 929 in the part number to 
   the desired series number.

Top of Page

Notes - Series 929, 138 & 928

  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", or 3/8" long. Aluminum cores are available 5/16" long only. Electrical specifications shown are made with 10-32, 3/8" long, carbonyl "E" or "J" cores, as noted. Other core lengths and materials are available.

  3. Electrical winding taps are available on series 138 and 928.

  4. Series 929, 138 & 928 windings are 16 TPI. The O.D. of the winding is .310". Distance from the mounting surface to the first turn on series 138 and 928 is is .10". Distance from the mounting surface to the first turn on series 929 is .09".

  5. The short shoulder indicates the start lead.

  6. Coil form material is polypropylene.

  7. These coils may be tuned with Standex tuning wrenches 55, 95, 302 or 764.

  8. Standex specifications are subject to change without notice.