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     Northam, Western Australia
     QRZ Page: VK6YSF

 

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TOROIDAL FERRITE CORE INDUCTOR DESIGN

Ferrite Toroidal Core Inductor Calculation.

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Calculation to determine the number of turns required for a range of ferrite core toroids to achieve a particular inductance value.

 

 

L =          Inductance in mH

 =       Inductive index in mH per 100 turns as specified by the manufacturer.

N =         Number of turns.  

 

Example

The number of turns required for a 1.2mH inductor if the  for the selected ferrite core is 150.

 

Core Number vs AL Value (nH/t2)       Note: AL Value +/-  20-30%

Core Number

Material ( )

43

61

63

67

68

72

75

77

F

J

W

H

FT-23-( )

165

25

*

7.8

4

*

990

356

*

*

*

*

FT-37-( )

375

55.3

*

19.7

8.8

*

2110

884

*

*

*

*

FT-50-( )

470

68

*

22

11

1100

*

990

*

2750

5430

8140

FT-50A-( )

510

75

*

24

12

*

*

1080

*

2990

*

*

FT-50B-( )

1025

150

*

48

24

*

*

2160

*

*

*

*

FT-82-( )

500

75

*

22.4

11.7

*

*

1060

*

*

*

*

FT-87-( )

*

*

*

*

*

*

*

*

*

3020

6040

9060

FT-87A-( )

*

*

*

*

*

*

*

*

3624

6040

12080

18100

FT-114-( )

540

79.3

*

25.4

12.7

*

*

1270

1902

3170

*

*

FT-114A-( )

*

146

*

*

*

*

*

2340

*

*

*

*

FT-140-( )

952

140

*

45

*

*

*

2250

*

*

*

*

FT-140A-( )

*

*

*

*

*

*

*

*

*

6736

*

*

FT-150-( )

*

*

*

*

*

*

*

*

2640

4400

*

*

FT-150A-( )

*

*

*

*

*

*

*

*

5020

8365

*

*

FT-193-( )

*

*

*

*

*

*

*

*

3640

6065

*

*

FT-193A-( )

*

*

*

*

*

*

*

*

4460

7435

*

*

FT-240-( )

1160

173

53

53

*

*

*

2725

*

6845

*

*

Table of AL values for a selection of ferrite core toroids.

 

  

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Page initiated 12 April, 2016 

Page last revised 05 November, 2025 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

   Space Weather

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   Notice Board

VK6YSF JS8Call and Olivia 8/250 operations.

Current activity is generally focused - though not restricted to - JS8Call operations on the 20m, 30m, and 40m bands.

Currently there is a particular emphasis on JS8Call on the 10 and 12 m band between 00:00 and 12:00 Z, often extending beyond this period.

Olivia 8/250 is used occasionally on the 20m band.

Proposed band and mode activity is often communicated on HamSpots: https://hamspots.net/js8/ or my profile on 

X: https://x.com/vk6ysf97230 .  

Feel free to contact me to discuss or arrange a schedule for a contact.

Post date: 7 December 2025

 

Western Australian SSTV net 

Popular Western Australian SSTV net for both digital and anolog SSTV.

Generally found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)

For more details: https://www.wasstv.net/wasstv.net/index.html

Post date: 8 December 2025

 

VK6MJM LF (136kHz) and MF (474kHz) Beacon

VK6MJM is a  LF/MF station located in Manjimup, Western Australia.

Common Mode: FST4W 300 (Similar to WSPR)  

Note: other modes and sub-modes may be used.

Station details were presented by Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter Hall VK6HP at PerthTech

QRZ Page: VK6MJM on QRZ.com

Post date: 10 March 2025

 

 

 
 

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