[time-nuts] Vintage Quartz Crystal Manufacturing
phb.hfx at gmail.com
Sat Nov 26 11:47:18 EST 2016
Not sure where you got the 80 K cps the seller mentions 80M(eter) and
the items are clearly marked 3720 KCS 3760 KCS and 3780 KCS which would
be in the 80 meter band.
On 2016-11-26 11:15 AM, Bob Camp wrote:
> 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 …
>> On Nov 26, 2016, at 7:40 AM, Adrian Godwin <artgodwin at gmail.com> wrote:
>> I bought some old crystals on ebay :
>> 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"
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