Hi agn Adrian .....quote from Wireless for the Warrior "Wireless Set No. 7 was a mobile transmitter/receiver developed in 1935. Use: communication between tanks. Frequency range 1.875-5MHz. MO/crystal control. RF output 5W. R/T and MCW. Range 3-5 miles. Unusual shape to fit in the bulge of a tank. Only a limited number were produced. Replaced by No. 9 set." Alan G3NYK ----- Original Message ----- From: "Adrian Godwin" <artgodwin@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Saturday, November 26, 2016 12:40 PM Subject: Re: [time-nuts] Vintage Quartz Crystal Manufacturing >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@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.

Hi Adrisn: The BC-611 Walkie-Talkie is a crystal controlled 2-way radio where there are a set of 4 components that need to be changed whenever a different frequency is needed. This needs to be done in a workshop and not it the field. http://www.prc68.com/I/BC611.shtml Those 4 components are the Rx crystal, Tx crystal, Tank coil and antenna coil. All of these were marked with the radio frequency rather than typical parameters for a component. So just because a component is marked with a frequency you can not be sure it's a crystal, coil or whatever. The URC-4 survival/rescue radio uses cylindrical crystals CR-24/U package): http://www.prc68.com/I/URC4.html#Components -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html The lesser of evils is still evil. -------- Original Message -------- > 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@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@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@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. >

Hi The CR-24/U is a *very* unusual crystal package. They had a tough time getting that one to work. Bob > On Nov 26, 2016, at 4:58 PM, Brooke Clarke <brooke@pacific.net> wrote: > > Hi Adrisn: > > The BC-611 Walkie-Talkie is a crystal controlled 2-way radio where there are a set of 4 components that need to be changed whenever a different frequency is needed. This needs to be done in a workshop and not it the field. > http://www.prc68.com/I/BC611.shtml > Those 4 components are the Rx crystal, Tx crystal, Tank coil and antenna coil. > All of these were marked with the radio frequency rather than typical parameters for a component. > So just because a component is marked with a frequency you can not be sure it's a crystal, coil or whatever. > > The URC-4 survival/rescue radio uses cylindrical crystals CR-24/U package): > http://www.prc68.com/I/URC4.html#Components > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > The lesser of evils is still evil. > > -------- Original Message -------- >> 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@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@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@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.