[time-nuts] Vibrations

Don Latham djl at montana.com
Thu Feb 11 18:39:49 UTC 2010


There is a heat conductive rubber gasket material for automotive use...It's 
the higher frequency mechanical thumps you need to get rid of.
Don

----- Original Message ----- 
From: "Stan, W1LE" <stanw1le at verizon.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Thursday, February 11, 2010 7:30 AM
Subject: Re: [time-nuts] Vibrations


> Hello Raj,
>
> I integrated a Symmetricom model X72 Rb  into a Down East Microwave (DEMI) 
> chassis
> and it does experience microphonics. This was for a friends 10 GHz 
> transceiver used for portable work.
> So getting rid of the microphonics is important.
> Somehow I need to mechanically isolate the Rb from the chassis and still 
> have a heat sink.
>
> Stan, W1LE
>
>
> Raj wrote:
>> While comparing a Rb FE5680 frequency reference with another RB or GPSDO 
>> I find that tapping a Rb unit causes a sudden shift in the scope display 
>> meaning the frequency has slightly shifted momentarily and locks back 
>> steadily with a phase shift. This does not happen in another Rb FE5680.
>>
>> Would something be loose I wonder ? Any experiences?
>>
>> Cheers
>>
>>
>
>
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