[time-nuts] antennas

[Heathkid]

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: <k6rtm at comcast.net>
To: <time-nuts at 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" <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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