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Re: LF: Neo6M vs Neo7M

To: [email protected]
Subject: Re: LF: Neo6M vs Neo7M
From: Paul Nicholson <[email protected]>
Date: Mon, 10 Jul 2017 20:25:39 +0000
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I bought a cheap NEO-7N based GPS module,

It just plugs in and works, and it accepts all the
regular UBX commands to set timing pulse width, or set
a timing frequency.

I've got it in frequency mode hooked up to a phase measuring
thing, with the reference coming from a Trimble GPSDOCXO.

It's only been running 20 minutes and the Trimble is still
warming up, but here's a first plot

After it has settled down, we can get an idea how good it
would be for a LF LO, by scaling up the phase by the
frequency ratio LO/9765.625.

The GPS modules is powered through its micro USB socket from
an RPi, which also fires the UBX config commands from it
using gpsctl > /dev/ttyACM0.   I've got the phase measuring
thing running on the RPi too - using the Octo audio card.
Sample rate jitter on the Octo is cancelled out in this
test, as the phase thing just looks at phase difference
between two input signals.

Paul Nicholson

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