[ARC5] Collins xfmr ratings

D C _Mac_ Macdonald k2gkk at hotmail.com
Fri Aug 15 11:23:41 EDT 2014


I'm just WAGing that a bleeder load of 10% or maybe even 5% of the total current would do that, Ken.
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
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> From: kgordon2006 at frontier.com
> To: ARC5 at mailman.qth.net
> Date: Fri, 15 Aug 2014 08:18:59 -0700
> Subject: Re: [ARC5] Collins xfmr ratings
> 
> On 15 Aug 2014 at 10:03, D C _Mac_ Macdonald wrote:
> 
> > Somebody asked what would be an "adequate bleeder."  It's been many
> > years since I looked up that sort of information, but I'd say that a
> > 20k, 25W resistor would work just fine.  That bleeder would draw 25 mA
> > and result in a 12.5 Watt draw.  You might want to go with 40k @ 10W
> > to drop to a 12.5 mA and 6.25 Watt draw. The latter would certainly be
> > more than adequate as a "safety" bleeder. 
> 
> We aren't talking here about a "safetly bleeder", Mac: we are talking about one that will 
> maintain "critical inductance" at low loads.
> 
> Look it up.
> 
> A choke input filter needs enough of a load on the output that the inductance of the 
> choke will remain high enough that the choke acts like a choke, and not a "wire".
> 
> Ken W7EKB
 		 	   		  


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