[time-nuts] Adjusting HP 5065A frequency

Bob Camp lists at rtty.us
Mon Oct 22 13:16:24 EDT 2012


Based on Time Nuts data - The OCXO's in the TBolt's have indeed gotten
better over the years. The early "Piezo" labeled parts did not do as well as
the later "Trimble" labeled parts. With the Trimble labeled parts, roughly
pre-2002 is a break point for performance.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Tom Van Baak
Sent: Monday, October 22, 2012 1:00 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Adjusting HP 5065A frequency

There's a history to many of the GPSDO products you hear us talk about.

I believe the original TBolt (fancy red case) did have an OCXO but it wasn't
particularly high quality. Perhaps Bob can shed light on this.

99% of TBolt's found on the surplus market today, and all the ones in the
TAPR deal, have a surprisingly good OCXO's. These were customer specials as
best we can determine, and never described on Trimble's web page. They are
in the plain brushed golden color aluminum case.

The Thunderbolt E is a relatively new product (fancy blue case,
ROHS-compliant) and isn't yet on the surplus market.


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