[time-nuts] antennas
shalimr9 at gmail.com
shalimr9 at gmail.com
Mon Sep 27 15:15:08 UTC 2010
Last time I checked, the HP/Symmetricom HP58532A GPS antenna was cheaper than a GPS splitter (I paid $50 for my HP58532A, with shipping, and it was brand new).
Of course, with two antennas, you will need two feed lines which, depending how long they are, could cost you more than the antenna itself...
Didier KO4BB
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: k6rtm at comcast.net
Sender: time-nuts-bounces at febo.com
Date: Mon, 27 Sep 2010 14:50:15
To: <time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts at febo.com>
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" <heathkid at heathkid.com>
Subject: Re: [time-nuts] DS1620 Variants in the Thunderbolt
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Message-ID: <795F7AA593814ECB9AA24F0B55CAD45D at 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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