[Amps] FC-30 Choke

[R.Measures]

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

> Francis,
> 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 100½s 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" <francis.carcia at hs.utc.com>
>> To: Phil Clements <philc at texascellnet.com>,"'AA6DX - Mark'"  
>> <aa6dx at arrl.net>, amps at contesting.com
>> 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: amps-bounces at contesting.com  
>> [mailto:amps-bounces at contesting.com] On
>> Behalf Of Phil Clements
>> Sent: Friday, December 02, 2005 7:41 PM
>> To: 'AA6DX - Mark'; amps at contesting.com
>> 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.
>>
>> (((73)))
>> 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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>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org