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 <[email protected]> > 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: [email protected] >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
