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Re: New TinySA user


 

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> Something may have been missed in this discussion, if so, apologies.

> To help, we have to know the source of the signal being sought. If it is a dead carrier, very well. However, if it is a chirp from a device, then it will not be seen.

> In the latter case, the level will be very low and the energy will be spread across the chirp; those are, after all, the whole idea of the protocol. In addition, of course, even if the signal were detected, it would be very brief indeed so it would be most unlikely to encounter a sweep that moves, in data communication terms, at a glacial pace. We are to note, too, that even if something were to be seen, then it would just look like a tiny flicker in amongst the rest of the "grass".

> Again, apologies if all that has been considered.

> John

> at radio station VE7AOV.

+++++


On 2022-04-25 11:26, W0LEV wrote:

Yes, that is what is being said.? If the signal is below the noise floor, you will be unable to detect the signal.? Spectrum analyzers in general, including some expensive units, typically exhibit a noise figure around 15 to 20 dB.? The more modern SAs include an internal preamp to rectify this situation.? If you have a low noise preamp, install it between the antenna and the input to the SA.?

Dave - W?LEV

On Mon, Apr 25, 2022 at 5:53 PM <cstyson68@...> wrote:

Thanks Erik, I¡¯ve tried three different antennas with the same result. This is what I¡¯m seeing:


When you say input noise floor, are you saying the signal may just not be strong enough to pick up?

thanks



--
Dave - W?LEV
Just Let Darwin Work

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