I don't know.? There's a broadcast band station about 1.5 mi away that wreaks havoc on longwave (along with numerous other bb stations but much further away).? It also interferes on higher HF with any preamps.? Haven't heard of the Cauer filter, is there a calculator online for it?? Will take a look.
I was concerned about toroid interaction.? I remember reading that close toroids were supposed to be a certain distance apart and at right angles to one another?? Just wanted to be sure.
Jon
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On 6/29/21 11:19 AM, Tony_AD0VC wrote:
Just build it and it will be fine. You probably only need maybe 20 or 30 db of attenuation really. Also, I would recommend the Cauer filter. It will do the job with a lower order and fewer parts.
Tony
________________________________
From: [email protected] <[email protected]> on behalf of JonI via groups.io <ji425bt@...>
Sent: Tuesday, June 29, 2021 8:57 AM
To: [email protected] <[email protected]>
Subject: [softrock40] homemade chebyshev 7th order BB band stop to begin soon
What parts I didn't have are on the way to start construction of the
chebyshev 7th order BB band stop filter. The inductors will be a
combination of ferrite and powdered iron toroids. I'll be using the
ugly duckling or island method to make this and then placing the board
into a metal casing. Since I haven't done anything like this in a
while, I wonder how compact I can get with the toroids, should there be
a certain spacing, orientation, etc? Thanks.
Jon
