[time-nuts] 5>10 doubler

[Richard (Rick) Karlquist]

On 1/28/2015 11:28 AM, Charles Steinmetz wrote:
> Gerhard wrote:
>
>> It is a different game when you want to notch away sub/harmonics.
>
> One problem with using crystals as traps (notch filters) is that the
> series resistance of a crystal is several orders of magnitude higher
> than that of a good series-resonant LC -- generally in the 50-100 ohm
> range.  So, although the notch is very narrow, it will not be very deep
> unless it is in a high-impedance circuit.  For example, in a 50 ohm

It is very straightforward to use LC networks to transform the
impedance of the crystal to a much lower value and get around this
problem.

Rick Karlquist N6RK