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These are 'on-air' signals common in broadcasting stations and of low intensity for the device with a range (example) of -110 dBm to - 40 dBm, completely within the instrument's operating range. It doesn't need - I think - an external attenuator.

Em sáb., 14 de out. de 2023 às 11:27, Bill Cromwell <wrcromwell@...> escreveu:

Hi,

How much signal are you applying from that antenna? I need attenuators on the input to my SAs with any antenna. Almost always benefit from attenuators ahead of the communication receivers too and for the same reasons.

73,

Bill ?KU8H

On Oct 14, 2023, at 1:37 AM, ronaldo martins <ram.ufrn@...> wrote:

?

Friends. Good morning. I have a doubt about tinSA measurement error (probably mine). Every radio frequency emission has the fundamental and harmonics. In a broadcast from a commercial FM station we have the main frequency (94.3 MHz, for example). The second harmonic will be at 188.6 MHz = (94.3 x 2). Choose the station (or signal generated by you) of your preference. Do it on your tinySA with an input at 85 MHz and a stop at 200 MHz and tune in to your station/signal, with the small antenna and input at Low or a direct cable. The international standard states that this second harmonic must be between 75-80 bB below the main one. Centering the marker on these two values we have practically the same value measured in
 - dBm (top left of the display). Which is an inconsistency. If anyone has any guidance, I would appreciate it.

AT

RAMartins