Time Signal project

Archiver

I need to build a portable self setting clock that can be tapped by a BS2.

I was looking at using the Ultralink WWVB receiver, but they discontinued it in May.
I can't use GPS because it has to work inside several buildings where I can't get a signal
with my GPS unit but can get a WWVB signal from NIST. And I can't use an internet signal
time signal (via 802.11b) because it needs to work outside, between the buildings, as well.

Cheap WWVB clocks from Oregon Scientific et al are all over eBay and Wal-Mart, but they
look a little daunting inside.

Has anyone hacked one of these to get a signal that a BS2 could recognise?

Any other suggestions?

Thanks,

- Gwyan Rhabyt

Archiver

Gwyan,

Partly it depends on just how accurate you need things to be. In most places
you can't catch WWVB all the time, so most synched clocks link up with WWVB
as often as they can, but often go hours unsynched. You say you need it
portable, but does that mean it will be taken to a location briefly, or will
it be installed for a longer period of time?

If short term, would it be acceptable to synch your device via GPS or other
WWVB receiver, employ an accurate RTC on your device, use the device at the
remote location, then return and synch it again? You could note the time
loss between the RTC and WWVB and make corrections. This could be pretty
accurate.

It is a pity that Ultralink stopped making those modules. I have one, and it
is terrific. I use it to synch a variety of projects, among them a Stamp
based Nixie clock. I thought they still made one in the $200 range, which is
a little pricey.

Jonathan

www.madlabs.info

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Original Message

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From: "Gwyan Rhabyt" <grhabyt@c...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, July 15, 2004 12:18 PM
Subject: [noparse][[/noparse]basicstamps] Time Signal project


> I need to build a portable self setting clock that can be tapped by a BS2.
>
> I was looking at using the Ultralink WWVB receiver, but they discontinued
it in May.
> I can't use GPS because it has to work inside several buildings where I
can't get a signal
> with my GPS unit but can get a WWVB signal from NIST. And I can't use an
internet signal
> time signal (via 802.11b) because it needs to work outside, between the
buildings, as well.
>
> Cheap WWVB clocks from Oregon Scientific et al are all over eBay and
Wal-Mart, but they
> look a little daunting inside.
>
> Has anyone hacked one of these to get a signal that a BS2 could recognise?
>
> Any other suggestions?
>
> Thanks,
>
> - Gwyan Rhabyt
>
>
>
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