[time-nuts] Vintage Quartz Crystal Manufacturing

Adrian Godwin artgodwin at gmail.com
Sat Nov 26 13:55:27 EST 2016


The markings are actually 3720 k/cs, 3760 k/cs and 3780 k/cs. And I think
it's probably for the wireless No 7 shown in http://www.wftw.nl/wsets.html.
But you could be right - they may not be crystals.

As for ebay .. yes, buyer beware. Though in this case I know the seller
personally and while he might be mistaken, he won't be intentionally
misleading.


On Sat, Nov 26, 2016 at 3:15 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> Welcome to eBay …..
>
> I don’t believe those are crystals at all. If you take a look at the
> markings on the parts
> they are labeled “80 K cps”. In other words they are 80 KHz not 80M
> devices. Looking
> at the gap, if there is a crystal in there it’s not obvious that it’s big
> enough for 80 KHz.
>
> My guess is that they are tank tuning caps for an mechanical MOPA style
> transmitter.
> The size and construction are about right for that sort of thing. Swap one
> in and the
> transmit frequency changes. Number 7 for 80 KHz. Number 8 for 85 KHz.
> Number 7 for
> 75 KHz. Just a guess …
>
> Bob
>
>
>
> > On Nov 26, 2016, at 7:40 AM, Adrian Godwin <artgodwin at gmail.com> wrote:
> >
> > I bought some old crystals on ebay :
> >
> > http://www.ebay.co.uk/itm/122225114483
> >
> > Is anyone familiar with this style ? I don't think the quartz is visible
> in
> > the glass section : I imagine that's just an insulator. I think the
> quartz
> > is under a brass disc, with a sping to hold the disc down visible through
> > the glass.
> >
> > Does anyone know what the reference marked on them "w'less sets No 7"
> > refers to ?
> >
> >
> > On Mon, Sep 26, 2016 at 6:50 AM, Mark Sims <holrum at hotmail.com> wrote:
> >
> >> Can you say "Mr Rogers' Neighborhood?"   I knew you could...
> >>
> >> He (along with creepy Mr McFeelie) always ran segments on how some item
> >> was made.   Geared towards pre-schoolers, but always worth watching.
> >>
> >> ---------------------
> >>
> >> Compare the Science channel's new "How Do They Do It" to the older "How
> >> It's Made"
> >> shows.
> >> _______________________________________________
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