[time-nuts] Thunderbolt Harmonics

Tom Curlee tcurlee at sbcglobal.net
Wed Jan 18 00:43:25 EST 2017

I'm not sure what the Thunderbolt specs state for harmonics, but -60 dB seems quite good to me.

      From: Rhys D <heyrhys at gmail.com>
 To: Discussion of precise time and frequency measurement <time-nuts at febo.com> 
 Sent: Tuesday, January 17, 2017 6:40 PM
 Subject: [time-nuts] Thunderbolt Harmonics
Hi all,

Before I start, let me say I'm rather a newbie at this sort of stuff so
please be gentle.

I was looking at the output of my Trimble Thunderbolt GPSDO and was rather
surprised to see really "loud" harmonics in there. ~ 60dB down from the
10Mhz signal.

Can anyone here shed some light on what I am seeing here?
Surely this isn't what it is supposed to look like? Should I be trying to
filter these before going to my distribution amplifier?

Thanks for any light you can shed.


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