[time-nuts] GPS first LO need to be locked?

Bob kb8tq kb8tq at n1k.org
Fri Mar 31 19:47:28 EDT 2017


There are a lot of GPS chips that do an I/Q mix down to a low IF. It’s then (re) sampled from there. The “LO” in this case would down convert to the low IF ….


> On Mar 31, 2017, at 6:08 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
> God natt Attila,
> On 03/31/2017 11:29 PM, Attila Kinali wrote:
>> God kväll Magnus,
>> On Fri, 31 Mar 2017 21:19:00 +0200
>> Magnus Danielson <magnus at rubidium.dyndns.org> wrote:
>>> Still fills the function of LO, as the sample and hold operates as a
>>> mixer and the fold-down can be seen as an overtone mix followed by a
>>> sampling of the mix product, so well, it's about the same thing.
>> "Harmonic mixer" is the word you are looking for :-)
> Not necessarily. It could be a locked oscillator too.
> Harmonic mixer is another way to go.
> Cheers,
> Magnus
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