[time-nuts] 10811 Repair - Voltage Check

[Rick Karlquist]

I think I remember now that the problem with soldering
is that the pins indeed are copper and have good thermal
conductivity.  So does the ceramic insulator (good for an
insulator anyway).  So you need to use a heavy soldering iron
that can heat the pin up quickly without having to heat the
entire crystal assembly.  The pins are not coated; that would
prevent welding.

Rick Karlquist N6RK


Jack Hudler wrote:
> If you clean it then any solder (63/37) will do.
>
> Could they have coated the leads?
>
> The thermal properties and CTE of Beryllium copper are not unknown to the
> astronomy community. Its dust is however extremely toxic!
>
> Now that I think about this perhaps this why they weld, to reduce the
> environmental impact of removing oxidized Beryllium copper.
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf
> Of geraldm at iprimus.com.au
> Sent: Wednesday, January 24, 2007 4:29 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10811 Repair - Voltage Check
>
> From memory, the pins are made from Beryllium copper, this material has
> good
> heat transfer properties and is generally much harder then straight
> annealed
> copper, however when slightly oxidised, it becomes difficult to solder.
>
> The Crystal element supported at the end of the pin(s), may receive
> excessive
> thermal shock with to much heat. I would exercise greater caution then
> normal.
>
> I suggest a fine flat pair of pliers at the base of the pin(s) leading
> into
> the ceramic insulator, this will help in dissipating the heat to the
> pliers
> jaws rather then transmitting the heat all the way to the Crystal element.
>
> Good luck
>
> Gerald
>
>
>
>
>
>>
>>
>>The pins are made of some alloy such as kovar.
>>I vaguely remember that you can solder to them
>>if you really want to.  I think the production
>>people decided welding was easier for them.
>>The stranded wires do have an annoying tendancy
>>to break off if you flex them very much.
>>
>>There may have been a concern that the heat of
>>soldering to the pins wasn't good for the crystal.
>>If you are going to solder, watch the heat.
>>
>>Rick Karlquist N6RK
>>
>>> -----Original Message-----
>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>>> Behalf Of Jim Palfreyman
>>> Sent: Tuesday, January 23, 2007 3:31 PM
>>> To: Discussion of precise time and frequency measurement
>>> Subject: Re: [time-nuts] 10811 Repair - Voltage Check
>>>
>>>
>>> On Wednesday, January 24, 2007 at 11:30:20 AM, Discussion of
>>> precise time and frequency measurement wrote:
>>>
>>> > Dr Bruce Griffiths wrote:
>>>
>>> > The crystal leads are supposed to be welded to the crystal base.
>>> > The blue wire looks OK but the green and red wires are suspect.
>>> > When welding wires one doesn't use solder dipped multistrand wires.
>>> > Maybe the red green wires do not make good electrical contact with
>>> the
>>
>>> > crystal pins.
>>>
>>> I have to ask this...why wouldn't soldering work?
>>>
>>> Jim Palfreyman
>>>
>>> --
>>> www.tasmail.com
>>>
>>>
>>>
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>>
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