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#1 2012-03-18 10:33:32
- einreb
- Member
- Registered: 2011-12-01
- Posts: 12
Substitute one size for another.
A part for a 20M receiver project I am building specifies a FT37-43 toriod in a RF input filter. I do not have that size, but I have a FT50-43 in my parts box. Can I substitute that size if I know the inductance required?
What determines the size of the toroid in a design anyway? For example, in this case, power is not a factor, can I use any practical physical size?
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#2 2012-03-18 18:06:16
- W8DIZ
- Administrator
- Registered: 2008-08-12
- Posts: 314
Re: Substitute one size for another.
einreb wrote:
A part for a 20M receiver project I am building specifies a FT37-43 toriod in a RF input filter. I do not have that size, but I have a FT50-43 in my parts box. Can I substitute that size if I know the inductance required?
What determines the size of the toroid in a design anyway? For example, in this case, power is not a factor, can I use any practical physical size?
Yes, you should use the 50-43; may require less windings for the same required inductance.
Size is only important to handle larger amount of power. For a filter...no problem.
Do you have a link to a schematic?
73, Diz, W8DIZ
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#3 2012-03-19 15:30:22
- einreb
- Member
- Registered: 2011-12-01
- Posts: 12
Re: Substitute one size for another.
Thank you, I thought as much.
As far as the schematic, I am trying to duplicate one of the QRP kits from K8IQY, of which the original one uses nothing but the 2N2222 Transistor. The later one uses some different transistors, and that is the one I like to build. I do not want to buy the kit, for I am only after the receiver part; I have no need for the transmitter part. The receiver uses some of the toroids I mentioned.
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#4 2012-03-19 16:57:39
- wa2mze
- Member
- From: South Florida
- Registered: 2009-08-22
- Posts: 171
Re: Substitute one size for another.
You can use the calculator on this website to determine the number of turns you'll need. Goto the toroid page for the sizes you are interested in and plug in the numbers.
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