[time-nuts] Function of cap to GND in isolation transformer circuit
lists at rtty.us
Wed Jul 21 07:49:55 EDT 2010
The cap likely improves the VHF stability of the circuit.
On Jul 21, 2010, at 7:46 AM, Joop wrote:
> 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:
> The first one is an output as described in the Efratom FRK manual, the
> second one the input in the TADD-2 manual.
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