Great suggestion! I bought two of the Symmetricom 58535A's from Mike Feher.
It'll be great only having to deal with *one* antenna and feedline plus I'll
have a spare antenna (and a spare splitter - for now)! :) Now... lots of
adapters and patch cables to buy (N to F)...
I've also bought four (4) DS1620 "D1" chips... so that should keep me in
business for a while. Since one of my Tbolts has an "E2" chip in it... was
there an E1? Did the E2 fix anything or should I just go straight back to
the D1? Is anyone keeping track of the temp chips and any long term
stability data on them? Seems there should be almost a decade of data out
there somewhere...
Thanks again...
73 Brice KA8MAV
----- Original Message -----
From: <k6...@comcast.net>
To: <time-nuts@febo.com>
Sent: Monday, September 27, 2010 10:50 AM
Subject: Re: [time-nuts] antennas
Rather than put up two antennas, why not use one, and pick up a
HP/Symmetricom GPS splitter? (Mini-Circuits makes a similar unit). You can
find them on eBay for various prices. The Symmetricom one, the 58535A,
supports 2 GPS receivers. It has a built-in amplifier and filters, so it
provides high isolation between the GPS units. It's powered from the GPS
units, and passes power to the antenna.
The downsides are that it costs more than a pair of cheap antennas, it's
heavy (heavier than the Thunderbolt!), and uses type N connectors.
But it's low noise, and you only have one antenna and feedline to worry
about.
73 bob k6rtm
------------------------------
Message: 3
Date: Sun, 26 Sep 2010 15:56:47 -0400
From: "Heathkid" <heath...@heathkid.com>
Subject: Re: [time-nuts] DS1620 Variants in the Thunderbolt
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Message-ID: <795f7aa593814ecb9aa24f0b55cad...@d1x25bd10>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
Thanks for all the information on the DS1620.
As it turns out, both of the TBolts (remember I got the from two different
sellers and appear identical) have the Trimble OCXO, v3.00 firmware, but
the
DS1620's are marked as follows:
DS1620
0415E2
531AD
DS1620
0239D1
690AB
Interestingly, the first one appears to have been swapped out at some
point
(flux residue all over the chip / had to clean it off to read the
markings).
I've already ordered another "D1" to swap out the "E2" but really need to
get them both up and running (still trying to figure out how to mount the
antennas!) and see how much difference there really is.
73 Brice KA8MAV
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