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Re: True frequency band upper limit detection level of TinySA Ultra ZS-407 and corresponding signal dropoff


 

On Wed, May 14, 2025 at 04:26 AM, Adam Coate wrote:

Do you know approximately what actual signal strength (in dBm) causes the device to enter Overload mode, especially when scanning above 7.3 GHz in Ultra or Harmonic mode? I¡¯ve seen the warning appear even when the reported signal is in negative dBm, such as ¨C4.3 dBm for 23.8434 GHz (see screenshot below). So I'm wondering if it's possible to use the Overload warning as another method to gauge the true dBm signal strength being measured.

Sorry, can't use the overload warning to improve accuracy

Also ¡ª would using an external attenuator help delay or prevent the Overload warning in these situations? I¡¯m curious if attenuation could help narrow down the true signal strength by observing how much reduction is needed before the overload disappears.

External attenuator can help reduce overload and increase accuracy when it avoids using the internal attenuator at frequencies above 10 GHz but the true problem with accuracy is the spread over devices.
You can create your own level offset correction table for these high frequencies, see PDF document referred to in Wiki
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You should charge the tinySA.
Operating with Yellow battery indicator signals worse performance
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Designer of the tinySA
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