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Re: [RFI] 2.4" OD #31 toroids

To: Tim Groat <tcgroat@mesanetworks.net>, RFI List <rfi@contesting.com>
Subject: Re: [RFI] 2.4" OD #31 toroids
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Tue, 31 Jan 2012 06:10:44 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Oops, sorry for not being more clear.  Yes, I would use two cores, but 
only a single one in each choke.  Jim's original cookbook used multiple 
cores in each.

73, Pete N4ZR
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On 1/30/2012 10:37 PM, Tim Groat wrote:
>> Also, since this is a receiving application, I assume I can get by with
>> a single core to keep the cost and bulk down.  Wrong?
> That probably won't work well. The core would couple the windings
> together, so that the voltage drop between the first coil and center-tap
> (primary) would be injected back into the second coil (secondary) by
> transformer action.
>
> It would be better to use two separate cores, which could be a bit
> smaller, spaced apart from each other to reduce capacitive coupling
> between them.
>
> 73,
> --Tim (KR0U)
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