[hpsdr] High Accuracy Timing for HPSDR

Mon May 22 13:38:13 PDT 2006

Steve,

I recommend that we plan for a primary and a backup GPS timing engine. In my
commercial product, the CNS Clock II, I now use overlaying footprints for an
M12 (Motorola M12+ or iLotus M12M) and a Trimble Resolution-T. The Trimble
is less expensive than the M12+ or M12M and uses a different set of
languages (TSIP and TAIP plus NMEA) but it has all the right features,
including the quantization (sawtooth) correction data. See
http://www.trimble.com/resolutiont.shtml. 

I will commit to updating the Tac32 family of software products to support
the Resolution-T in a timely fashion, as I need to do that sooner or later
anyway.

I will make available the artwork and interface circuitry from my commercial
product to simplify the development of this board, if you like.  Perhaps I
could do more but I am still trying figure out who is doing what and to
evaluate the options for my participation on this project.

I have an account with Trimble and will procure any number of these
receivers for the project at cost if that is interesting. I will need to get
updated price information.

Rick
W2GPS
AMSAT LM2232

-----Original Message-----
From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
Steven Bible
Sent: Wednesday, May 17, 2006 11:26 PM
To: hpsdr at hpsdr.org
Subject: Re: [hpsdr] High Accuracy Timing for HPSDR

***** High Performance Software Defined Radio Discussion List *****

Hi Chris,

Yep, Achim mentioned this a couple of days ago on this list.  It is
expensive at $179.00 each.  But it is a possibility.  The only other thing
to consider is the software to configure and run it, such as TAC32 does for
Motorola and Garmins.

73,

- Steve, N7HPR
 (n7hpr at tapr.org)

> -----Original Message-----
> From: Christopher T. Day [mailto:CTDay at lbl.gov]
> Sent: Wednesday, May 17, 2006 5:08 PM
> To: Steven Bible; hpsdr at hpsdr.org
> Subject: RE: [hpsdr] High Accuracy Timing for HPSDR
>
>
> Steve,
>
> Would this module be suitable? I stumbled across it and know nearly
> nothing about what's desirable, but it does say "timing module" and
> makes claims similar to those for the ublox LEA-4T.
>
>
> 	Chris - AE6VK
>
>
> P.S. - RefLock II complete. Thanks for you help.
>
> P.P.S. - Anyone know where to find any technical information about the
> Deluo GPS WAAS for Laptop device?
>
>
> -----Original Message-----
> From: Steven Bible [mailto:srbible at earthlink.net]
> Sent: Wednesday, May 17, 2006 4:32 PM
> To: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] High Accuracy Timing for HPSDR
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi Achim,
>
> I know the Crystek folks.  If we can get a large order, we can bring the
> price down.  It was my encouragement that got them to offer the OCXO as
> a catalog order item.  Normally, OCXOs are build to order.  I've got
> quotes from several companies and the prices include NRE.  So this is a
> bargin, so to speak.
>
> Buying HP 10811's surplus on eBay, I've spent easily $175.00 for one!
> Having a source is important.
>
> I am always open for ideas.
>
> - Steve N7HPR
>
>
>
> -----Original Message-----
> >From: Achim Vollhardt <avollhar at physik.unizh.ch>
> >Sent: May 17, 2006 6:58 PM
> >To: hpsdr at hpsdr.org
> >Subject: [hpsdr]  High Accuracy Timing for HPSDR
> >
> >***** High Performance Software Defined Radio Discussion List *****
> >
> >Hi Steven,
> >just checked with Mouser for the OCXO you listed.. 260 bucks for single
>
> >quantity? Can't be true.. can it?
> >
> >73s Achim, DH2VA
> >
> >> Hi Alex,
> >>
> >> I'd be willing to help with this board since I was the one that laid
> out the
> >> Reflock II PCB.
> >>
> >> As to a GPS engine, we need to look for a timing GPS.  A timing GPS
> can
> >> perform a self survey and then lock its position for a more accurate
> 1PPS
> >> signal.  The older 8-channel Oncode UT, UT+, and VP, or the newer
> 12-channel
> >> M12, M12+, and M12+ Timing have been timing GPS of choice for hams
> since we
> >> could buy them and using W2GPS's TAC32 program to operate them.
> Since
> >> Motorola sold off its Oncore line to SiRF, and the dust is about to
> settle,
> >> the M12 line will come out later this year as the M12M.
> >>
> >> I have already started on a PCB that integrates the GPS, Reflock II,
> and 10
> >> MHz OCXO (I am looking at the Crystek CO27VH15DE-12-10.000 available
> from
> >> Mouser).  The goal I have is to design the board such that all the
> parts can
> >> be readily purchased.  I really don't want to rely on surplus GPSs
> and
> >> OCXOs.  This entire lash up will be tested in N8UR's timing lab.  The
> GPS
> >> footprint would accomidate the Oncore UT/VP and M12 GPSs.  So if you
> can
> >> populate which ever one you have on hand, or can purchase surplus or
> a new
> >> M121M.
> >>
> >> 73,
> >>
> >> - Steve, N7HPR
> >
> >
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>
> \r\n- Steve\r\n  (n7hpr at tapr.org)\r\n
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