[time-nuts] Vintage Quartz Crystal Manufacturing
brooke at pacific.net
Sat Nov 26 16:58:04 EST 2016
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.
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):
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
> On Sat, Nov 26, 2016 at 3:15 PM, Bob Camp <kb8tq at n1k.org> 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
>> 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
>>> the glass section : I imagine that's just an insulator. I think the
>>> 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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