PERSEUS vs AM strong signals
This is the issue I have on two different Perseus connected to a Cushcraft R7 vertical antenna; when I monitor the broadcast HF band, e.g. centered on 15.224MHz in France, and when there is a relative strong AM signal around -60dBm, I can see the noise floor apart this signal, moving up and down according the AM modulation; it is possible to demodulate the signal even in the noise due to this move. I tried to add attenuation, to switch off the LNA, , to change the sampling rate, the phenomena remains. In the same conditions I dont see the noise floor moving on my ESH3-EZM R&S receiver, so I think the issue is in the Perseus itself. I tried to inject the same level with a RF generator and the noise floor of thePERSEUS remains low .
Did somebody observed the same issue ?
Thank you for read my message and may be give me the solution.
NB was activated at max level in NBW mode; selecting NBN mode improve the reception; deactivating the NB or setting the level at the middle remove the noise apart the AM signal. Thank you very much for your help.