[time-nuts] Re: Ublox ZED-F9T - group delay

[Bob Camp]

Hi

Unfortunately, the group delay of the typical SAW(s) varies a bit from part to part and across the passband of the SAW(s). Indeed, what you are seeing is “in the ballpark” ( = 10 to 40 ns) for this sort of thing.

Why SAW plural? In a multi-band design they just might have one for each band ….

Bob

> On Apr 29, 2024, at 6:36 AM, rf lab via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi All,
> 
> I have a ublox ZED-F9T with a very short RF trace to an SMA connector (<
> 1cm), so I expect the delay due to the RF line to be in the ~100's pico sec
> range.  Using a GNSS simulator I measure the average 1pps delay relative to
> the simulator to be about 25ns.  This figure is quite close to a typical
> GNSS SAW group delay.
> 
> My question is if anyone has done something similar or knows what the
> actual delay is for a ZED-F9T module.
> 
> Thanks
> Fred
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