[time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Bob kb8tq]

Hi

Ahhhh, but did you then whip up a batch of ammonium bifluoride  to clean them up after 
playing with the grinding compound? :) They figured that part out part way through WWII.
The lack proper post grind etch just about had all the radios out there out of service.

Bob

> On Feb 27, 2020, at 5:12 PM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
> 
> Been there; done that!
> 
> Rick N6RK
> 
> On 2/27/2020 12:15 PM, David Van Horn via time-nuts wrote:
>> I remember opening up those military crystals and sanding them down with Ajax cleaner to raise the frequency or rubbing a little solder on the plate to lower it for CW transmitters.
>> High school days. 😊
>> --
>> David VanHorn
>> Lead Hardware Engineer
>> Backcountry Access, Inc.
>> 2820 Wilderness Pl, Unit H
>> Boulder, CO  80301 USA
>> phone: 303-417-1345  x110
>> email: david.vanhorn at backcountryaccess.com
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