I wouldn't go by the photos posted as even the item shipped is *not* what is
shown (stock photo?).
Anyway, I've gotten two TBolts (one from each vendor you linked to) and they
are *identical*. Same in every way as if from the same stock. I can say I
have been very happy with my purchases from both of these vendors (both
shipped fast and VERY well packaged).
I've opened up both TBolts (both a dark battleship gray color) and they both
have the Trimble OCXO and v3.00 firmware (on a sticker). Both have the same
DS1620 temp sensor... but there is where I have a question.
What is the preferred (better) temperature sensor I've read about? I have
searched the archives and have not yet found the right thread I guess.
Has anyone made a list of "these are the components you want to look for
when purchasing a Thunderbolt"?
Thanks...
----- Original Message -----
From: "John Miles" <jmi...@pop.net>
To: <les...@veenstras.com>; "Discussion of precise time and frequency
measurement" <time-nuts@febo.com>
Cc: <q...@yahoogroups.com>; "'David'" <n7...@yahoo.com>
Sent: Wednesday, September 22, 2010 4:34 AM
Subject: Re: [time-nuts] [qs1r] Looking for good, cheap, external reference
Hi,
I'm interested in doing some ionospheric research, but I don't
want to break
the bank with an $8,000 USD GPS disciplined Rubidium clock.
Anyone have some ideas on cheaper alternatives?
Suggest getting one of these, or another one like it:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180419218430
There are several cheaper ones for sale but make sure you get the 3.00
firmware and Trimble-labelled OCXO if possible, as they are better
performers than the older ones. E.g., avoid item 290308733659 as it's not
doing well in either the phase noise or ADEV departments, going by the
photos he's posted.
-- john, KE5FX
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