[R-390] filters

[Bob Camp]

Hi

The mechanical filters are made up of resonators. They work by acoustic resonance. You need to be very careful about how you mount them.

Bob
KB8TQ

On Feb 6, 2013, at 9:31 PM, John Wendler <wendlerjrv at gmail.com> wrote:

> Would any of the knowledgeable folk on the list care to comment about the
> donut material and whether the old material was chosen as an acoustic
> isolator to prevent microphonics?
> 
> 73 de John, N5CQU
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