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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