To me, these devices look like they may have a quartz crystal at the bottom, and spring and screw adjuster on the top. Bob - AE6RV
From: Paul Berger <phb....@gmail.com> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Sent: Saturday, November 26, 2016 10:47 AM Subject: Re: [time-nuts] Vintage Quartz Crystal Manufacturing 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. Paul. On 2016-11-26 11:15 AM, Bob Camp 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 <artgod...@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 <hol...@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. >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >>> mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.