[ARC5] Crystal work-around question. OT more

[Kenneth G. Gordon]

On 23 Sep 2020 at 18:26, J Mcvey via ARC5 wrote:

> 
> The crystal in question is a sealed HC25U type.
> The frequency is low by about 400 Hz, so it can't be padded. Could it be "brought 
> up" with an adjustable series cap?
> I have a new one on order, but was wondering if anyone had a "fix" without 
> replacing the crystal?
> 
> I suspect too much 'pulling" would cause instability if there was a way.
> What say you guys?

Also, I have unsoldered the "cap" on the top of some of such crystals and have raised their 
frequency by VERY carefully grinding an edge in one spot. It doesn't take much. Even one or 
two "swipes" with an emery board will do it.

However, it is SO EASY to destroy the crystal, I gave up on that method.

Ken W7EKB