[time-nuts] Frequency reference over WiFi?

[Joseph Gray]

Since 802.11g uses OFDM, I did a bit of reading about that modulation
scheme as used in WiFi. OFDM is not spread spectrum, so there may be a
way to do this. Now if I can find a datasheet on either the BCM5352 OR
BCM5454 chips. So far, Google isn't turning up any datasheets.

Joe
KA5ZEC

On Sat, Jan 9, 2010 at 7:12 PM, Lux, Jim (337C)
<james.p.lux at jpl.nasa.gov> wrote:
> Not with an unmodified interface, however there are several ways to do it..
>
> Lock the access point's local oscillator to your external reference.
> When the receiver gets carrier lock and sync, its local oscillator is locked
> to the AP's local osc which is locked to your ref. Use that to discipline
> your local reference.
>
> Mind you the "receiver's local oscillator" is probably partly analog (an XO
> driving a PLL for the RF front end) and partly digital (in the demodulator).
>
> If you're ambitious, I believe that someone has implemented
> 802.11(something) for the Ettus USRP.
>
> You might start by just seeing how many oscillators there are in the access
> point, and whether you can generate those from your external reference. If
> you run ALL the clocks in the thing off the reference, you've got a fair
> chance that any signal emitted will also be locked.
>
>
> On 1/9/10 6:05 PM, "Joseph Gray" <jgray at zianet.com> wrote:
>
>> I'm thinking of repurposing some 802.11G WiFi routers for amateur
>> radio. Sending NTP over WiFi should be usable, but is it possible to
>> send a frequency reference over this type of link? Being spread
>> spectrum and packetized, I don't see how. Please enlighten me if you
>> know of a method.
>>
>> Joe
>> KA5ZEC
>>
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