[time-nuts] GPS receiver local oscillator (was: 1PPS for the beginner)

paul swed paulswedb at gmail.com
Wed Aug 15 17:20:18 EDT 2018

Wanted to add a bit to the conversation. At least in a number of older GPS
receivers circa 1989-1994 the LO was indeed locked to a 10 MHz reference.
These were the typical separate mixer and antenna systems. The first LO was
1500 MHz.
That is an expensive way to go so I can see why whats described here is
attractive to lowering costs.

On Tue, Aug 14, 2018 at 6:14 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Tue, 14 Aug 2018 14:42:52 -0700
> Wayne Holder <wayne.holder at gmail.com> wrote:
> >  I'm not sure what you consider "low cost' but a 16 bit DAC like the
> > MAX5216BGUA+
> > <https://www.mouser.com/ProductDetail/Maxim-
> Integrated/MAX5216BGUA%2b?qs=sGAEpiMZZMswix2y39ylddFcA27kRS
> R8c6%2fDlE45lrQ%3d>
> > goes for $3.40, quantity one.
> If you want a product that ships on time, you dont buy Maxim ;-)
> A 14bit DAC can be had for about 2USD at 1000pcs. A TCXO costs
> in the order of 1USD at 1000pcs. A simple XO goes for less than 0.1$.
> I guestimate that a GPS receiver like a u-blox LEA has a BOM cost
> of less than 10$. Adding a 2$ component will seriously hurt the
> ability of the CEO to buy a new Porsche with his next bonus. ;-)
>                         Attila Kinali
> --
> <JaberWorky>    The bad part of Zurich is where the degenerates
>                 throw DARK chocolate at you.
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