[time-nuts] another Ebay mixup, 5370

John Miles jmiles at pop.net
Sat Jun 9 21:00:11 EDT 2007



> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Dr Bruce Griffiths
> Sent: Saturday, June 09, 2007 5:53 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] another Ebay mixup, 5370

> Internal crosstalk can cause the 5370 to appear to be much better than
> specified.
> The jitter will vary as you vary the length of the cable connecting the
> external 10MHz output to the input.
> If the input is attenuated (inadvertently by internal fault or
> otherwise) the jitter will increase considerably with a sine wave input.

That's a really good point, actually.  Said, have you done an input
sensitivity check?  It's really common for the x1/x10 attenuator and other
front-panel switches to be intermittent.  It is not hard to take the front
panel apart, disassemble the switches, and treat them with ProGold or a
similar high-quality cleaner/lube.  You may need to do that before the
jitter values make sense.

-- john, KE5FX




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