[time-nuts] [Off-List] antennas & GPS Splitters

Mon Sep 27 16:55:32 UTC 2010

Hi

The HP splitters I have torn into have a few nice features:

1) They have built in RF bandpass filtering on a per output basis. No
re-circulating RFI. Better protection for the GPS receiver input. 
2) They will pass DC from one port and correctly DC terminate the other
ports (no antenna missing lights blinking on and off).
3) They have an RF gain block that compensates for the loss of the splitter.
4) The gain block is padded down at each output. You can butcher it to have
gain if you wish on a per port basis.
5) The construction is *massive*. If you drop one, you may break a toe, you
are unlikely to damage the splitter. Ground fault currents are not going to
be an issue.
6) If you get one of the neat ones with external DC supply - it can feed +12
to an "oddball" antenna. 

Definitely worth picking up if you don't already have several. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Mike Feher
Sent: Monday, September 27, 2010 11:34 AM
To: brooke at pacific.net; 'Discussion of precise time and frequency
measurement'
Subject: Re: [time-nuts] [Off-List] antennas & GPS Splitters

Brooke -

The data can be found on the Symmetricom site. Connectors are N. 73 - 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 Brooke Clarke
Sent: Monday, September 27, 2010 11:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] [Off-List] antennas & GPS Splitters

Hi Mike:

Can you tell me about features of the 58535A?
Connector type, DC pass through, photo?
Total to zip 95482?

Have Fun,

Brooke Clarke
http://www.PRC68.com

Mike Feher wrote:
> 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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>    

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com

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