[AMPS] Transformer Current ratings

[Ian White, G3SEK]

2 wrote:
>
>>
>>One other trick to check a transformer is to measure the resistance of the
>>secondary winding. ...
>
>//   Bingo.  The primary winding R as well as the mains R are also
>factors.

The *effective* secondary resistance - including the contribution from 
the primary - is the value that should be used in calculations.

If the primary resistance is too low to measure accurately (which it 
should be for the kind of transformers we're interested in!) the total 
effective secondary resistance is roughly double the measured secondary 
resistance.

-- 
73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
                           'In Practice' columnist for RadCom (RSGB)
                            http://www.ifwtech.com/g3sek

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