(*) uW Radio ham application where you arrive on the top
of the hill and switch all equipment on and can be making
contacts minutes after having better than 1e-8(1e-9).
that's precisely the sort of application I'm looking at..
Wheels stopped to on-the-air in 20 minutes.
Then... Look no
Is there some (inexpensive) GPSDO that has a time from power on in an
unknown location to reasonably stable in the 5 minute category?
Frequency accuracy in the 1E-9 range would be fine.
A regular old GPS has a Time to First Fix well under that, and it should
be cranking out 1pps pulses with
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of jimlux
Sent: 14 July 2010 14:43
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] rapid startup GPSDO
Is there some (inexpensive) GPSDO that has a time from power on in an unknown
location
Trimble Thunderbolt: I once forgot the minus sign keying in
latitude for the stored position, and it ran for days.
I wondered why I was having trouble seeing the satellites. :)
David C. Partridge wrote:
After a forced cold start in an unknown location, the TB will still be
searching for
Jim,
The implementation I've done on reflock II
(on a MAXII CPLD form Altera
http://www.qsl.net/ct1dmk/reflock.html )
Had fast aqs time in mind(*).
It captures in few 1pps pulses
and could stabilize to about 1% of dac range
in quite less then 60s.
How slower you need it to be in addition to the
is if there is a way to save the current Almanac
I do not know how to do that. It takes a good 15 min to get a new one after
power up.
ws
***
[time-nuts] rapid startup GPSDO
David C. Partridge david.partridge at perdrix.co.uk
Wed Jul 14 14:21:44 UTC 2010
After a forced cold start
Luis Cupido wrote:
Jim,
The implementation I've done on reflock II
(on a MAXII CPLD form Altera
http://www.qsl.net/ct1dmk/reflock.html )
Had fast aqs time in mind(*).
It captures in few 1pps pulses
and could stabilize to about 1% of dac range
in quite less then 60s.
How slower you need it to
2010 06:42:50 -0700
From: jimlux jim...@earthlink.net
Subject: [time-nuts] rapid startup GPSDO
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Message-ID: 4c3dbeda.7010...@earthlink.net
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Is there some
Hi
I would guess that a fairly simple TCXO / fast lock GPS combo would get you
pretty close.
Bob
On Jul 14, 2010, at 12:13 PM, jimlux wrote:
Luis Cupido wrote:
Jim,
The implementation I've done on reflock II
(on a MAXII CPLD form Altera
http://www.qsl.net/ct1dmk/reflock.html )
Had
