Envelope-to: g3yxm@wireless.org.uk
Delivery-date: Tue, 25 Oct 2005 02:30:55 +0100
Message-ID: <BAY102-F1638BA8E3A1C33D9EDE8A9CF760@phx.gbl>
From: "Laurence KL1X" <hellozerohellozero@hotmail.com>
To: lowfer@lwca.org,  rsgb_lf_group@blacksheep.org
Subject: [LW] XDW "issues"
Date: Mon, 24 Oct 2005 17:25:08 -0800
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XDW returned at 0117z  25th October. It had been off for an interdeterminate 
period.

The fault was on a #0 copper lug connecting to one of the Ceramic feed 
thru'swhere the loop conductors are connected. This lug and is connection 
had gone "HR" and produced a lot of heat enough to melt insulation and 
finally cause an open circuit on the lugs itself and the feed thru nuts and 
bolts. With around 50A (49.5Amps) of aerial current it pays to keep 
everything very very tight. I replaced every nut and bolt which had become 
heat stressed and "dark" to be on the safe side.

I rewired the 2T coupling loop, replaced the feed thru and reconnected and 
everything has come up fine with no changes in the loop tuning.

For people asking about the Decca 5501 ruggediness  - it has been running 
into an "open" circuit for the past period during this fault -  Nice thing 
is that virtually no current is drawn from the PA in class "N" (N between D 
and E ((!)) in this fault condition and everything stayed cool.

Currently running about 1.1Kw into the loop....Ill check everything coolish 
in an hour but I have a 3.30am start to catch a plane...Ill leave the gear 
on whilst Im away.


Laurence
kl1x/5 wd2xd2 137.775 staircase...
em26aq


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