[DSP-10] FW: Binocular Core for L32?

[Rich Miller]

-----Original Message-----
From: Rich Miller [mailto:av8torrich at yahoo.com] 
Sent: Wednesday, September 18, 2013 10:59 AM
To: 'kd7ts'
Subject: RE: [DSP-10] Binocular Core for L32?

Hi Mike:

I was thinking of using a BN43-2402 for this application. To be honest, I
could almost go to a slightly larger binocular core based on the space I
have for L32.  The BN43-2402 has an AL of 1440 +/ - 20%.  Based on the
following calculations it should work:

1. Turns = SQR(33000/1440)
2. SQR(22.92) = 4.78 Turns or round to 5.0 *I could also try 4.5 turns due
to the tolerance of the core

This would allow a larger diameter wire to be used, and the core could be
affixed to the board in a much more stable manner. It also seems this could
help in preventing a winding error with the very small FT22 Size Cores.

I have the equipment to measure inductance here at close to the design
frequency of this inductor.


Rich, AJ3G


-----Original Message-----
From: kd7ts [mailto:kd7ts at comcast.net]
Sent: Wednesday, September 18, 2013 10:24 AM
To: dsp-10 at mailman.qth.net; Rich Miller
Cc: kd7ts at comcast.net
Subject: Re: [DSP-10] Binocular Core for L32?

On Wed, 18 Sep 2013 06:31:41 -0700, Rich Miller  <av8torrich at yahoo.com>
wrote:

> I wonder if anyone in the group has tried using a small, 43 material, 
> binocular core for L32?  If so I would appreciated if you could pass 
> along how it worked for you.

Hi Rich,

I have not done this, nor heard of anyone doing this.

It seems it could work.. IF...there is room for enough turns.

Can you measure inductance ?

If I knew what your part number (BN xxx) is, I could try making one to
measure.

L32 is part of the center element of a low pass filter

C31 in shunt, L32/C85 in series, C30 in shunt.

73 Mike KD7TS