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Re: [Amps] FC-30 Choke

To: "Angelo Karabetsos" <>
Subject: Re: [Amps] FC-30 Choke
From: R.Measures <>
Date: Tue, 6 Dec 2005 06:42:32 -0800
List-post: <>

On Dec 5, 2005, at 10:59 PM, Angelo Karabetsos wrote:

I assume you wired both in series. That should be enough inductance for 160m. Just for curiousity sake, DCR is a half an ohm per winding.
73 VE3YN

With due compensation, 9uH works well as a bifilar filament choke on 160m. To compensate for the 100Ωs of XL in the 9uH choke, one adds c. 1000pF to C-2 of the 160m tuned input -- and they lived happily ever after.

From: "Carcia, Francis A HS" <>
To: Phil Clements <>,"'AA6DX - Mark'" <>,
Subject: Re: [Amps] FC-30 Choke
Date: Mon, 5 Dec 2005 07:58:08 -0500

Well My 4-1000A Linear works fine on 160 with a FC30. Pi network input
circuit. gfz

-----Original Message-----
From: [] On
Behalf Of Phil Clements
Sent: Friday, December 02, 2005 7:41 PM
To: 'AA6DX - Mark';
Subject: Re: [Amps] FC-30 Choke

The B&W FC series of chokes were all 3-30 mhz continuous coverage.
The ferrite rods were only 3.5 inches long; too short to get the proper
turns of wire on the rod to properly cover 160m. That's why they rated it
3-30 mhz instead of 1.8-30 mhz.

Phil Clements, K5PC

> METHINKS, only thinks, that the "A" version incorporated 15M, which the
> older one without did not ... as there was no 15M band at time it was
> manufactured ... that right, gang? --- Mark AA6DX

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Richard L. Measures, AG6K, 805.386.3734.

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