[time-nuts] Re: What GNSS module to buy for a good time reference?

[Dana Whitlow]

"L2 unmodulated carrier"?   As in a CW tone?

Dana


On Wed, Jun 21, 2023 at 12:13 PM Lux, Jim via time-nuts <
time-nuts at lists.febo.com> wrote:

> On 6/21/23 7:37 AM, John Ackermann N8UR via time-nuts wrote:
> > The F10T looks interesting, but from the datasheet it is missing a few
> > maybe important features compared to the ZED-F9T:
> >
> > -- L1/L5 bands only (no L2 option)
>
>
> I'm not sure no L2 is such a big deal - going forward, people are
> pushing to L5. It's better protected spectrum management (adjacent user)
> wise, it has 3dB more power than L1, and longer spreading codes.   The
> only hiccup is that it's only live on 17-18 satellites, 24 by 2025.  L2
> has *less* power than L1, but the longer codes for L2C should make up
> for that.
>
> A question would be whether a L1, L2 receiver uses the L2C, or whether
> they are just doing phase retrieval on the L2 unmodulated carrier (older
> satellites). Or some sort of codeless processing.
>
> There's also a somewhat wider spread between L1 and L5, so in theory,
> you could do better ionospheric corrections.
>
> L1 - 1575.42
>
> L2c - 1227.6
>
> L5 - 1176.45
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