A good example of using two chokes like this is in the Heathkit SB-220. The
large plate choke is at a 90 deg angle to the smaller one. Even in tank
circuits, it recommened to mount the parts at right angles to one another.
Best,
Will
*********** REPLY SEPARATOR ***********
On 8/7/05 at 5:12 AM R.Measures wrote:
>On Aug 6, 2005, at 4:54 PM, Angelo Karabetsos wrote:
>
>> I figured a split plate choke must be for decoupling.
>
>That's in the paper world, Angelo. In the real world, putting two
>coils end-to-end produces coupling, not decoupling. To produce
>decoupling, the coils need to be at right angles.
>
>> I will try out HAMCALC. The plate choke I have here is probably not
>> rated for high current. It looks to be of a thread like conductor. 22
>> ga. magnet wire should do the trick with room to spare, as Rich
>> stated. Thanks Will, Rich, Harold and Phil.
>> VE3YN Angelo
>>
>> <br><br><br>>From: "Phil Clements"
>> <philc@texascellnet.com><br>>To: "'Harold B.
>> Mandel'" <ka1xo@juno.com>,
>> <ve3yn@hotmail.com><br>>CC:
>> <amps@contesting.com><br>>Subject: RE: [Amps] Plate choke
>> resistance<br>>Date: Sat, 6 Aug 2005 14:31:07
>> -0500<br>><br>><br>>Sometimes builders use more than one RF
>> choke and a<br>>vacuum relay to switch the additional choke into
>> the<br>>circuit to arrive at enough inductance to prevent
>> RF<br>>power from entering the power supply at
>> lower<br>>frequencies.<br>><br>>A vacuum relay is not
>> necessary. I use a method taken from<br>>Creative Electronics. All
>> you need is a Radio Shack relay.<br>><br>><br>>B&W
>> manufactured a successful RFC for amplifiers<br>>called a Type 800
>> and then a type 802. They had<br>>ceramic cores and fit most
>> chassis situations, but<br>>their wire guage was this and they
>> aren't able to<br>>handle the amperages needed on some big
>> tube<br>>amplifiers.<br>><br>>A choke sold by RF Electronics
>> and sold/used by Ameritron<br>>costs c. $23, and is resonant around
>> 11.5 mhz, well outside<br>>all ham bands. It will do 2 amps with no
>> problems at all.<br>><br>>(((73)))<br>>Phil Clements,
>> K5PC<br>><br>><br>><br>
>>
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>
>Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
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