Envelope-to: dave@picks.force9.co.uk
Delivery-date: Wed, 01 Feb 2006 04:00:16 +0000
From: Warren K2ORS/WD2XGJ <k2ors@comcast.net>
To: rsgb_lf_group@blacksheep.org,  rsgb_lf_group@blacksheep.org
Cc: "Jay Rusgrove" <JRusgrove@comcast.net>
Date: Wed, 01 Feb 2006 03:58:41 +0000
Message-Id: <020120060358.12389.43E031F10003AEC90000306522092246270B97010D0A020E06979D0E03@comcast.net>
Subject: Re: LF: XGJ
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Jay,
  The core was wrapped with Scotch #27 fiberglass tape.

--
73 Warren K2ORS/WD2XGJ
FN42hi
http://www.w4dex.com/wd2xgj.htm

 -------------- Original message ----------------------
From: "Jay Rusgrove" <JRusgrove@comcast.net>
> Warren
> 
> Was the core wrapped with tape? What type?
> 
> Jay
> ----- Original Message ----- 
> From: "Warren K2ORS/WD2XGJ" <k2ors@comcast.net>
> To: <rsgb_lf_group@blacksheep.org>; <rsgb_lf_group@blacksheep.org>
> Cc: "MIKE REID" <we0h1@msn.com>
> Sent: Tuesday, January 31, 2006 9:25 PM
> Subject: Re: LF: XGJ
> 
> 
> > Mike,
> >
> >   The 50 ohm side was made up of Litz wire from the Decca tank coil. The loop 
> side was #4 stranded
> wire with pvc insulation.
> >   After examining the transformer close up it appears that the transformer 
> arced from primary to
> secondary. This seems to be correlated with the damp rainy weather yesterday, 
> the transmitter was
> running full power for 6 and a half hours before the transformer arced over.
> >
> > --
> > 73 Warren K2ORS/WD2XGJ
> > FN42hi
> > http://www.w4dex.com/wd2xgj.htm
> >
> >  -------------- Original message ----------------------
> > From: "MIKE REID" <we0h1@msn.com>
> > > What type of insulation & wire gauge did you have before?
> > >
> > > Mike
> > > WE0H
> > > WD2XGI
> > >
> > >   ----- Original Message ----- 
> > >   From: Warren K2ORS/WD2XGJ
> > >   To: rsgb_lf_group@blacksheep.org<mailto:rsgb_lf_group@blacksheep.org>
> > >   Cc: LWCA LF Reflector<mailto:lowfer@lwca.org>
> > >   Sent: Tuesday, January 31, 2006 5:18 PM
> > >   Subject: Re: LF: XGJ
> > >
> > >
> > >
> > >   Hello the list,
> > >
> > >
> > >         I disassembled the toroidal transformer in the loop ATU and found 
> the
> > > cores to be good. I will attempt to pick up some teflon insulated wire 
> tomorrow
> > > and rebuild the transformer, if all goes well will be back on the air 
> tomorrow
> > > evening.
> > >
> > >   --
> > >   73 Warren K2ORS/WD2XGJ
> > >   FN42hi
> > >   http://www.w4dex.com/wd2xgj.htm<http://www.w4dex.com/wd2xgj.htm>
> > >
> > >    -------------- Original message ----------------------
> > >   From: (Warren K2ORS/WD2XGJ)
> > >   > Hello the list,
> > >   >
> > >   >   Many thanks for all the reports last night from Hartmut, Jean-Pierre
> > > (F5YG),
> > >   > Juan, Gary, and Roelof (Hope I didn't miss anyone!)
> > >   >
> > >   >   As many of you have noted the signal dropped off at 03:00 UTC. At 
> 04:00 I
> > >   > noticed XGJ was very weak on the W3EEE 'grabber'. I went downstairs to 
> the
> > > radio
> > >   > shack to investigate. The antenna current (measured at 50 ohms) was less
> > > than
> > >   > 100 mA ! It should be approximately 5 Amps from the Decca PA. I checked 
> the
> > >   > Decca on a dummy load and it was ok. I tried the smaller transmitter and
> > > noticed
> > >   > a very high SWR. I went out and looked at the ATU, flashlight in hand. 
> The
> > >   > secondary of the toroidal step down transformer had arced and burned 
> through
> > > the
> > >   > insulation. I believe that the very high humidity played a part in the
> > > breakdown
> > >   > of the insulation.   I will have a look at the transformer today and may 
> be
> > > able
> > >   > to repair it if the toroidal core is not damaged.  I am hopeful that the
> > > core is
> > >   > o.k. since impedance measurements showed no change and I was able to run 
> the
> > > 250
> > >   > watt transmitter into the antenna with a low swr after a period of time
> > > (after
> > >   > the tuner cooled down).
> > >   > I will of course use better insulated wire for the high voltage!
> > >   >
> > >   >
> > >   >
> > >   > --
> > >   > 73 Warren K2ORS/WD2XGJ
> > >   > FN42hi
> > >   > http://www.w4dex.com/wd2xgj.htm<http://www.w4dex.com/wd2xgj.htm>
> > >   >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> 
>