[time-nuts] antennas & GPS Splitters

[Mike Feher]

I still have some of the Symmetricom 58535A GPS splitters/amplifiers.
Details:

1 58535A  $35 plus $ 4.95 priority flat rate shipping
2 58535A  $65 plus $ 4.95 priority flat rate shipping
4 58535A $120 plus $10.70 priority flat rate shipping

These are new in original packing.

PayPal to my email plus 4% for PP fees, or check for exact amount. PP email
is n4fs at eozinc.com

Thanks & Regards - Mike


Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960




-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of k6rtm at comcast.net
Sent: Monday, September 27, 2010 10:50 AM
To: 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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