Metalwork - Lathe and Mill topics

Monday, 4 August 2025

Re: [Amateur-repairs] Calibrating test equipment?

Andrew, that seems to be a GPS disciplined crystal, but I'm a learner of this stuff.

From: Amateur-repairs@groups.io [mailto:Amateur-repairs@groups.io] On Behalf Of jahman via groups.io
Sent: Monday, August 4, 2025 6:59 AM
To: Amateur-repairs@groups.io
Subject: Re: [Amateur-repairs] Calibrating test equipment?

Try: https://www.ebay.com/itm/296906570708

73 de Andrew/N5ASE

On Sun, Aug 3, 2025 at 11:57 PM don Root via groups.io <drootofallevil=teksavvy.com@groups.io> wrote:

Clint, how did you come by "my Rubidium time base."? The ones I see advertized would clean my pockets out just for a down payment.

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𝔻𝕠𝕟 VA3DRL [ GIO might place this at the bottom of Quoted text, and not my text]

Re: [Amateur-repairs] Calibrating test equipment?

Try: https://www.ebay.com/itm/296906570708

73 de Andrew/N5ASE

On Sun, Aug 3, 2025 at 11:57 PM don Root via groups.io <drootofallevil=teksavvy.com@groups.io> wrote:

Clint, how did you come by "my Rubidium time base."? The ones I see advertized would clean my pockets out just for a down payment.

--
𝔻𝕠𝕟 VA3DRL [ GIO might place this at the bottom of Quoted text, and not my text]

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Sunday, 3 August 2025

Re: [Amateur-repairs] Calibrating test equipment?

Clint, how did you come by "my Rubidium time base."? The ones I see advertized would clean my pockets out just for a down payment.

Re: [Amateur-repairs] Calibrating test equipment?

RE: "A man with a watch knows what time it is. A man with two watches is never sure."

So no wonder I’m always late. But mine stopped.

Re: [Amateur-repairs] Calibrating test equipment?

On Sun, 03 Aug 2025 13:39:29 -0700, "Clint, VE3CMQ" <ve6cmm@secrs.com>
wrote:

>For frequency tests, I use a commercial GPS receiver with a 10MHz reference output or my Rubidium time base. It's interesting to watch both of them on a scope as over several seconds, one will drift a cycle. Now I don't know which one is correct! That's the problem with having 2 or more references, you never know which one to believe!

"A man with a watch knows what time it is. A man with two watches is
never sure." — Segal's Law

Donald KX8K

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Re: [Amateur-repairs] Calibrating test equipment?

For frequency tests, I use a commercial GPS receiver with a 10MHz reference output or my Rubidium time base. It's interesting to watch both of them on a scope as over several seconds, one will drift a cycle. Now I don't know which one is correct! That's the problem with having 2 or more references, you never know which one to believe!

Clint, VE3CMQ

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Friday, 1 August 2025

Re: [Amateur-repairs] Calibrating test equipment?

For frequency I use WWV, for FM I use the Bessel method, for RF level (generator and receive on the spec a) I use a friend's unit that has traceable reference.

For voltage (AC and DC) I sent my Fluke meter for check (as a reference) for my other DVMs and old school meters. But yes, time goes on for the old equipment.

Regards, Karl Shoemaker
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