[time-nuts] Vintage Quartz Crystal Manufacturing

[Bob Camp]

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 at 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 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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