[time-nuts] AN/URQ13 reference AT cut crystal?

[Magnus Danielson]

Hi Tom,

On 2021-02-17 16:24, Tom Van Baak wrote:
> See pages 20-29 in the Mar-1981 HPJ for the "new SC-cut" 10811
> article(s):
>
> https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1981-03.pdf
>
> It talks about 10544A/C/B and 10811A/B in detail. It compares AT/BT/SC
> cuts.
>
> Read especially "The SC Cut, a Brief Summary" on page 22.

Thanks for reminding us of this HPJ.

In here it is also noted that the 10544 is a BT cut, and this comes to
contrast that HP never come clean with which cut was used, as some have
said. Here we have some clear evidence.

Also note that it traces the SC-cut back to 1974, and that the same cut
also been called TTC and TS in early papers. It's interesting to note
that HP had double-angle cut machines since 1965, so the new cut did not
caused them a big challenge. Exactly which double-angle cut's they did
before SC remains to be found.

It is however interesting. They also refer to early papers in page 22
and 23.

Cheers,
Magnus