[time-nuts] TCVCXO Adjustment
kb8tq at n1k.org
Sat Apr 14 09:00:41 EDT 2018
The uBlox based parts will provide pretty good timing into a directly connected
PC. By that I mean, they are on a dedicated USB controller hooked directly to
In this context, the objective is microsecond level timing. We’re not after
a TimeNut couple of nanoseconds. Even if it’s 10 us, you still get to 0.1 ppm
in 100 seconds…..
> On Apr 14, 2018, at 12:59 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> The alternative is to plug a USB GPS into the mac and do a bit of code to
>> compare things. If you want to pass the gizmo around to your friends …. that
>> can be done. Pretty good ones are “sub $10” delivered.
> USB GPS gizmos generally don't have a PPS and the timing on the NMEA
> sentences is generally crappy. (I may be biased by a few bad examples.)
> Does anybody have a list of ones known to work well?
> There is at least one GPS-USB with PPS, the Navisys GR-601W/GR-701W/GR-801W,
> They were hard to get retail. Looks like idealez sells them Taiwan for $47
> for the 701W (Ublox 7), $50 for the 801W (Ublox 8) (plus shipping). I
> haven't tried ordering through them. Gary and/or Mark may have some for sale.
> Plan B is a GPS breakout and a USB-serial breakout and a few wires. 4x less
> USB jitter if your USB-Serial chip is full-speed.
> I got mine from SparkFun:
> Venus GPS with SMA Connector
> USB to Serial Breakout - FT232RL
> Google found this. I don't know anything more:
> These are my opinions. I hate spam.
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