Dear Mal, LF Group,

 

No – it is possible to design these transformers with a small air gap, but there does not appear to be a great advantage to doing so because the required number of turns increases, increasing the “copper” losses and offsetting any reduction in core loss. There is always a quite large gap in the original LOPT – often this is produced by inserting plastic film spacers between the core halves. These, and any glue, should be removed so that the core halves fit together perfectly. Sometimes the gap is produced by machining the core legs to unequal lengths, in which case you can’t really use the core in this application.

 

Cheers, Jim Moritz

73 de M0BMU

 

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of hamilton mal
Sent: 31 March 2005 13:36
To: [email protected]
Subject: LF: TX Cores