[time-nuts] Function of cap to GND in isolation transformer circuit

Bob Camp lists at rtty.us
Wed Jul 21 07:49:55 EDT 2010


Hi

The cap likely improves the VHF stability of the circuit. 

Bob


On Jul 21, 2010, at 7:46 AM, Joop wrote:

> Hi, 
> 
> I noticed in several circuits that the 10MHz isolation transformer in
> input and output circuits have a 6.8nF or 10nF capacitor to GND. How
> necessary is this for suppression of unwanted signals? Is the
> transformer itself not sufficient? I would expect common mode issues to
> be a bit worse with the cap in place.
> 
> The circuit I refer to can be seen here:
> http://www.uploadarchief.net/files/download/cap2gnd.png
> 
> The first one is an output as described in the Efratom FRK manual, the
> second one the input in the TADD-2 manual.
> 
> Cheers,
> 
> Joop
> 
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