[GPS_Standard] New subscriber

Thu Mar 1 08:33:59 EST 2007

Hi Mat,
I agree with Bert about the quality of the GPS engine. The only caveat to 
shooting for the higher accuracy, is that the OCXO has to live up to the 
higher expectations too.  To improve accuracy requires a greater integration 
time, and this then relies on better short term stability of the OCXO.
with a cheaper OCXO and a better GPS engine you are on a winner as the 
significantly lower jitter on the 1PPS allows for relatively shorter 
integration times. My standard has been running for months now and performs 
extremely well.

I still have a number of the Trimble Palisade GPS integrated receiver / 
antennas available (though still no connectors for them) These are dedicated 
timing grade systems, that output low jitter 1PPS, and are ideally suited to 
the ZAZ standard.
The connection is via a 12pin connector carrying RS422 differential serial 
format data , 1PPS and 12V. Twisted pair cable is needed and an interface 
from RS422 to TTL can be made with a couple of standard chips.
I managed to construct a crude connector by dismantling other connectors for 
the contacts, and sleveing them with heatshrink. the whole lot is just taped 
up, and so long as it is not under mechanical strain, will work fine.

 The units are designed for permanent exterior use.
More detail on these can be found on my website at www.dc2light.co.uk. (inc 
full handbook and software)
They are available for GB£25 each + postage  (about GB£6 to the US £5 to 
Europe)

To the Hungarian Radio Amateur who inquired a while ago, I seem to have lost 
your email.. Please contact me again!

----- Original Message ----- 
From: "Bert, VE2ZAZ" <ve2zaz at sympatico.ca>
To: "Matt Osborn" <kc0ukk at msosborn.com>; <gps_standard at mailman.qth.net>
Sent: Thursday, March 01, 2007 12:53 PM
Subject: Re: [GPS_Standard] New subscriber

> Hi Matt,
>
> Welcome aboard. I'll address a couple of your questions.
>
> I'm assuming you don't like the way that the archives are presented on the
> Mailman service. I don't consolidate all the postings into one single 
> file.
> But the mailing list is quite young, so there is only 5 months to consult.
> There is a zipped text file available for each month. Just append those 
> and
> you'll get all the postings in one single file. See
> http://mailman.qth.net/pipermail/gps_standard/ .
>
> Regarding GPS units, we can definitely say that the more accurate the GPS
> is, the better the results will be. But it does not mean that cheaper 
> units
> will not be satisfactory to you. It all depends on the level of accuracy 
> you
> are shooting for. My statement is the following: Considering the level of
> accuracy and stability stated in the article (better than 1x10^-9) this
> system can produce, an automotive-grade GPS will suffice. But of course, 
> if
> you can get a hold on a "timing" grade unit for a reasonable price, don't
> pass! It seems that many of the users of this standard have elected to use
> the Motorola Oncore series of boards. These are no longer made, but they 
> are
> available on eBay for a reasonable price. The one I use is the Oncore GT+.
> If you can get a hold on a UT+ instead, it is even better since the UT+ 
> has
> "timing" grade accuracy, as opposed to the other Oncore units that are
> automotive-grade. Trimble make good units too. Over the time I have been a
> user of 1PPS signals, I have read and experienced myself (see my website)
> that the Garmin GPS-25/35 series has flaws and should be taken out of the
> purchase list. In general, expect to pay between $20 and $50 on eBay for a
> suitable GPS.
>
> I hope the above will be helpful.
>
> Regards,
>
> Bert, VE2ZAZ
>
> ----- Original Message -----
> From: "Matt Osborn" <kc0ukk at msosborn.com>
> To: <gps_standard at mailman.qth.net>
> Sent: Thursday, February 22, 2007 8:59 PM
> Subject: [GPS_Standard] New subscriber
>
>
> Hello,
>
> My name is Matt Osborn and I intend to build the VE2ZAZ Frequency
> standard.
>
> I hate to run through all the standard new guy questions, so I'll try
> the short cuts first:
>
> Has anybody archived the previous posts from this reflector?
>
> Are there any useful web sites (besides VE2ZAZ)?
>
> I still need to decide on a GPS receiver. Is there an overwhelming
> favorite?  How about one that is overwhelmingly disliked?
>
> Thanks for reading my post.
>
> -- kc0ukk at msosborn dot com
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>
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