Envelope-to: dave@picks.force9.co.uk
Delivery-date: Sun, 23 Oct 2005 00:47:12 +0100
From: Warren K2ORS/WD2XGJ <k2ors@comcast.net>
To: rsgb_lf_group@blacksheep.org,  rsgb_lf_group@blacksheep.org
Cc: Joe Craig <jcraig@mun.ca>
Date: Sat, 22 Oct 2005 23:45:55 +0000
Message-Id: <102220052345.20934.435ACF330004447B000051C622073007930B97010D0A020E06979D0E03@comcast.net>
Subject: Re: LF: VO1NA
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Joe,
>And as for warming a Decca (and
> eventually some worms under the QTH) I have acquired a Hammond
> No. 93895 1.1kVA type "Q" transformer 117 to 55 volts.  I have no
> idea what a type "Q" is.  From what I've read it's a "control" xfmr,
> but this tells me little.  Will it melt if I use it to heat the
> Decca? 

   The Decca (for the full 1200 watts output) takes 60V at 22 amps, which is just over 1.3 kW. Given that the kW rating is as much as 20% lower than the kVA rating something like a 1.6 kA transformer would be ideal. 
   One possibility - can you get a second Hammond transformer and parallel two of them? Another possibility would be to run the Decca at reduced power,  perhaps 700-800 watts. 
   If you do run full power with the one Hammond keep an eye on the transformer's temperature!
--
73 Warren K2ORS/WD2XGJ
FN42hi
http://www.w4dex.com/wd2xgj.htm


> Hi Steve (and Mike WE0H),
> 
> You are quite preceptive... a chainsaw weekend indeed.  I cut a 100'
> line in the woods this afternoon. And as for warming a Decca (and
> eventually some worms under the QTH) I have acquired a Hammond
> No. 93895 1.1kVA type "Q" transformer 117 to 55 volts.  I have no
> idea what a type "Q" is.  From what I've read it's a "control" xfmr,
> but this tells me little.  Will it melt if I use it to heat the
> Decca?  It looks a bit small for 1.1 kVA.  Interestingly, it's potted
> and waterproof!  Its maximum temperature rise is 80 deg. C. I'm hoping
> it will survive QRSS120.
> 
> 73
> Joe
> 
> On Fri, 21 Oct 2005, Steve McDonald wrote:
> 
> >
> > > > 137.777 will be quiet for the next few days.  Hope
> > > > to have an improvement in ERP in the near future.
> >
> > Do I smell a Decca warming up in the corner ????
> >
> >
>