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M

mikes@flatsurface.com

Mon, Jun 13, 2011 2:39 PM

At 10:49 AM 6/13/2011, Alberto di Bene wrote...

Why almanac data are not kept ? Not enough space in that non volatile
memory ?

Flash and EEPROMs have a limited number of write cycles available. For
a timing receiver, position changes rarely - almanac data changes
frequently.

At 10:49 AM 6/13/2011, Alberto di Bene wrote... >Why almanac data are not kept ? Not enough space in that non volatile >memory ? Flash and EEPROMs have a limited number of write cycles available. For a timing receiver, position changes rarely - almanac data changes frequently.

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Alberto di Bene

Mon, Jun 13, 2011 2:49 PM

Every time I switch on my Thunderbolt (cold start) Lady Heather tells me that there are no
almanac data. It takes a few tens of minutes before they are collected again.
I was under the impression that TB had some sort of non volatile memory, and it must have it,
as it is capable of remembering the position after a site survey.

Why almanac data are not kept ? Not enough space in that non volatile memory ?

TNX

73 Alberto I2PHD

Every time I switch on my Thunderbolt (cold start) Lady Heather tells me that there are no almanac data. It takes a few tens of minutes before they are collected again. I was under the impression that TB had some sort of non volatile memory, and it must have it, as it is capable of remembering the position after a site survey. Why almanac data are not kept ? Not enough space in that non volatile memory ? TNX 73 Alberto I2PHD

CV

Christian Vogel

Mon, Jun 13, 2011 4:02 PM

Hi Alberto,

Why almanac data are not kept ? Not enough space in that non volatile
memory ?

the thunderbolt is meant for permanent installation in mobile base
stations where power outages are pretty rare, so I guess the designers
didn't see it worthwhile.

Chris

Hi Alberto, > Why almanac data are not kept ? Not enough space in that non volatile > memory ? the thunderbolt is meant for permanent installation in mobile base stations where power outages are pretty rare, so I guess the designers didn't see it worthwhile. Chris

RD

Robert Darlington

Mon, Jun 13, 2011 5:54 PM

EEPROM's do have a finite number of write cycles to any particular memory
location, but it's about 100,000 or more. That's 11 years worth if written
to once an hour round the clock (the same location in memory, that is).
This is probably not the issue. I personally never noticed but then again,
my TBolt has been on for the last 2 years, attached to a big UPS.

-Bob

On Mon, Jun 13, 2011 at 8:39 AM, Mike S mikes@flatsurface.com wrote:

At 10:49 AM 6/13/2011, Alberto di Bene wrote...

Why almanac data are not kept ? Not enough space in that non volatile

memory ?

Flash and EEPROMs have a limited number of write cycles available. For a
timing receiver, position changes rarely - almanac data changes frequently.

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EEPROM's do have a finite number of write cycles to any particular memory location, but it's about 100,000 or more. That's 11 years worth if written to once an hour round the clock (the same location in memory, that is). This is probably not the issue. I personally never noticed but then again, my TBolt has been on for the last 2 years, attached to a big UPS. -Bob On Mon, Jun 13, 2011 at 8:39 AM, Mike S <mikes@flatsurface.com> wrote: > At 10:49 AM 6/13/2011, Alberto di Bene wrote... > > > Why almanac data are not kept ? Not enough space in that non volatile >> memory ? >> > > Flash and EEPROMs have a limited number of write cycles available. For a > timing receiver, position changes rarely - almanac data changes frequently. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

MD

Magnus Danielson

Mon, Jun 13, 2011 6:43 PM

On 06/13/2011 06:02 PM, Christian Vogel wrote:

Hi Alberto,

Why almanac data are not kept ? Not enough space in that non volatile
memory ?

the thunderbolt is meant for permanent installation in mobile base
stations where power outages are pretty rare, so I guess the designers
didn't see it worthwhile.

Takes a SRAM chip and a battery to hold power. Not big magic, but if the
application is very unlikely to need it, it will just be a waste.

Almanac, position, fairly recent parameters from the oscillator and
configuration would all be suitable to go in there.

Cheers,
Magnus

On 06/13/2011 06:02 PM, Christian Vogel wrote: > Hi Alberto, > >> Why almanac data are not kept ? Not enough space in that non volatile >> memory ? > > the thunderbolt is meant for permanent installation in mobile base > stations where power outages are pretty rare, so I guess the designers > didn't see it worthwhile. Takes a SRAM chip and a battery to hold power. Not big magic, but if the application is very unlikely to need it, it will just be a waste. Almanac, position, fairly recent parameters from the oscillator and configuration would all be suitable to go in there. Cheers, Magnus

time-nuts@lists.febo.com

Does TB keep almanac data ?