[time-nuts] RasberryPi, timing and GPS receivers

[Attila Kinali]

On Tue, 16 Oct 2012 15:06:19 -0600
xaos at darksmile.net wrote:

> Question: What GPS timing module should I go with? No more Motorola  
> Oncore so what's best right now? Who sell modules? What are the price  
> ranges?

I would go for the LEA modules. For once because you get pretty complete
documentation for them (for free, w/o NDA) and because you can get the
older modules (like LEA4-S) for 20-30CHF on ebay. Yes, they are not
timing receivers, but the datasheet specs the PPS output as better than
60ns, which is for the use of an ntp server more than good enough.
The newer ones are footprint compatible (modulo new function pins)
and with a little care when doing the design you can solder all from
LEA4 to LEA6 onto the same board without changes.

A new LEA6-T single piece cost IIRC 190EUR from the webshop.
A LEA5-T was IIRC half price.

And a little caution: the LEA5 modules use considerably more power during
aquisition than the LEA4 did and the LEA6. IIRC we measured up to 150mA
(compared to <100mA with LEA4). I don't know the Rasberry, but i guess
that should be not a proble, but you should check for it nevertheless.

			Attila Kinali

-- 
The trouble with you, Shev, is you don't say anything until you've saved
up a whole truckload of damned heavy brick arguments and then you dump
them all out and never look at the bleeding body mangled beneath the heap
		-- Tirin, The Dispossessed, U. Le Guin