[time-nuts] Ublox neo-7M GPS
EWKehren at aol.com
EWKehren at aol.com
Tue Aug 19 20:15:41 UTC 2014
Knowing a litle bit about semiconductor production it is safe to assume
that all 7M series divvices have the same chip and during production at ublox
some features are disabled or enabled. The result is one mask set one chip
run and one inventory.
I did see a recent announcement where a 7M can be used as a GPSDO one of
the intended markets is micro cell sites.Will require an external XO.
In the meantime we have been playing with a $ 15 M7 ublox that can be
programmed from 1 pps to 1 KHz and use it in a PLL. I call it a GPS PLL and is
mainly intended for Ham's. Clark had years ago a similar circuits we have
added some mods. Using a Morion 89 we get better than 1 E-10 per second on
first try.. There have been recent claims using 1000 seconds which is easy
but this is per second. Next steps are more fine tuning and lower cost XO's.
Maybe even a VCTCXO. As I said before intended for Ham's, field day, uwave
and SDR. Not really a time nut unit, but low cost off the shelf standard
parts and no adjustments all on a 5 X 5 cm board. With a Morion you have to
start off with 15 V but there are OCXO's out there for 5 V. Ideal for
fieldday 12 V.
Bert Kehren
In a message dated 8/19/2014 12:20:40 P.M. Eastern Daylight Time,
CollinG at navcanada.ca writes:
Good day all,
On another list to which I subscribe, there has been chatter about the
Ublox neo-7M GPS receiver. It seems that the device's configurable timepulse
output is configurable from 0.25hz to 10 MHz as well as it's duty cycle and
can also be set to be one condition when the GPS is not locked and a
different condition when locked (i.e. 1 PPS if not locked, 10KHz when locked).
This seems all too good to be true. Sounds like a very simple
self-contained GPSDO.
I don't know anything more about the device. I have just downloaded the
documents and will be spending some time reading them.
I am curious if any other list members were aware of this feature of this
device and have had any first hand experiences with it.
There is another model, the 7N. the 7M uses a simple crystal clock, the 7N
a TXCO.
Cheers, Graham ve3gtc
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