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LF: XGJ

To: rsgb lf reflector <[email protected]>
Subject: LF: XGJ
From: Warren K2ORS/WD2XGJ <[email protected]>
Date: Tue, 31 Jan 2006 15:18:57 +0000
Cc: LWCA LF Reflector <[email protected]>
Delivery-date: Tue, 31 Jan 2006 15:20:25 +0000
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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


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