A 1MH 300ma piewound choke should be just fine in normal operation and still
give the amps fuse time to react. Just dont use some slow clunky breaker.
Carl
KM1H
----- Original Message -----
From: "Jim Barber" <audioguy@q.com>
To: "Carel, pc5m" <pc5m@xs4all.nl>
Cc: <amps@contesting.com>
Sent: Tuesday, January 10, 2012 4:44 PM
Subject: Re: [Amps] Safety choke question
> Hi Carel.
>
> I don't think I can get enough inductance with any reasonably sized
> stack of powdered-iron cores, but perhaps ferrite. I'll check into it.
>
> Thanks,
> Jim N7CXI
>
> On 1/10/2012 10:13 AM, Carel, pc5m wrote:
>> Hi Jim,
>>
>> I suppose you would like to put that choke across the (50Ohm) output
>> terminal ? Think 225uH is not needed at all to have negligible effect at
>> 160mtrs. I would go for a reasonable sized toroid (2 inch dia) and larger
>> dia wire. Than you know for sure something else will fail before you
>> "safety" is no longer in place....
>>
>> Gl, Carel, pc5m
>>
>> -----Original Message-----
>> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
>> Behalf Of Jim Barber
>> Sent: maandag 9 januari 2012 11:21
>> To: amps@contesting.com
>> Subject: [Amps] Safety choke question
>>
>> So what do you all think about using an RF Parts RFC-3 (225 uh 1.5A 4KV)
>> plate choke as the safety choke for a large HF amp?
>>
>> The supply is 4KV at up to 2A, bridge rectifier with 32uf of filter.
>> Although the supply *can* source 2A CCS, the duty processor will drop the
>> mains relays if more than 1A flows for more than roughly 100us. Whether
>> that
>> happens as designed or the mains fuses blow first I don't know yet.
>>
>> Anyway - the circulating current in the choke should be low enough to
>> ignore
>> on 160m, and the effect on the tank should be manageable, especially
>> since
>> this amp won't run above 20m. (in this incarnation at least) I *think*
>> the
>> wire should be large enough to hold until the mains fall out and the caps
>> discharge, but I'll have to think up a way to test that without stressing
>> the supply or myself too much.
>>
>> I got the idea from an old posting of Ian's, in case anyone experiences
>> deja
>> vu... ;-)
>>
>> Thanks and 73,
>> Jim, N7CXI
>>
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