Re: LF: Decca faulty transformer?

To:	[email protected]
Subject:	Re: LF: Decca faulty transformer?
From:	Andy Talbot <[email protected]>
Date:	Mon, 4 Apr 2011 19:13:47 +0100
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Disconnect all windings and measure the inductance.   If the
transformer is OK, the L will be high - with Xl many times the
operating impedance.   A shorted turn - which is what it looks as if
you may have - will drastically lower L to a value that should be
evident

Andy
www.g4jnt.com



On 4 April 2011 18:56, Mike Dennison <[email protected]> wrote:
> I have a fault on my Decca 5501 LF transmitter. It appears that the
> main output transformer / combiner is faulty. Each Tx module takes
> current when connected to the transformer, even when the output is
> disconnected. And there is no power out of the transformer.
>
> I have some questions:
>
> According to the the circuit diagram, the transformer's output
> winding has a 3.3nF capacitor across it. However, it seems to be
> invisible! Does anyone know where it is? Is it inside the pot core?
>
> Does anyone have a spare transformer for sale?
>
> Has anyone had a similar fault?
>
> Is it difficult to disassemble the transformer?
>
> It is very difficult to test for shorted turns because the resistance
> is extremely low.
>
> Any ideas?
>
> Mike, G3XDV
> ==========
>
>
>

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