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

[Lux, Jim]

On 6/23/23 2:09 PM, Dana Whitlow via time-nuts wrote:
> "L2 unmodulated carrier"?   As in a CW tone?
>
> Dana

P/Y code on I, nothing on Q (so "bpsk" as opposed to QPSK).  The table 
says "unmodulated"


>
>
> 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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