What type of insulation & wire gauge did you have before?
Mike
WE0H
WD2XGI
----- Original Message -----
From: Warren K2ORS/WD2XGJ
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
--------------
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
>
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