Automatic LNA settings w/band
Automatic LNA settings w/band
The RSP1A varies its LNA setting (in the device control panel) automatically per frequency band selection. For example, if I have the radio tuned to 10 mhz, LNA set where I want it, and then retune to, say, 100 mhz in the FM broadcast band, the LNA gain automatically increases and raises the noise floor slightly.
I find this annoying because I am constantly readjusting, especially when I use the RSP1a as a spectrum analyzer with SDR#. With the old RSP1 I could leave the LNA off and simply calibrate level by using the IF gain and nothing would change until I changed it again.
Can this behaviour with the RSP1A be stopped? I want the LNA gain to stay where I put it regardless of the center frequency which I select.
Any help appreciated, and thank you .
I find this annoying because I am constantly readjusting, especially when I use the RSP1a as a spectrum analyzer with SDR#. With the old RSP1 I could leave the LNA off and simply calibrate level by using the IF gain and nothing would change until I changed it again.
Can this behaviour with the RSP1A be stopped? I want the LNA gain to stay where I put it regardless of the center frequency which I select.
Any help appreciated, and thank you .
Reason: No reason
Re: Automatic LNA settings w/band
On the RSP1A, the RF Gain reduction range changes from 0-6 below 60 MHz to 0-9 above 60 MHz, the position of the slider looks like it's changing because the range changes. However if you were at setting 3 lower than 60 MHz, you will still be at setting 3 above 60 MHz.
Ideally you should be at 0 (max gain) unless you have ADC overload or inter-modulation issues.
Best regards,
SDRplay Support
Ideally you should be at 0 (max gain) unless you have ADC overload or inter-modulation issues.
Best regards,
SDRplay Support
Reason: No reason
Re: Automatic LNA settings w/band
Very good and thank you for the super fast response .
Reason: No reason
Re: Automatic LNA settings w/band
On a related problem. My issue is the IF gain changing, usually going up to full gain, when I switch bands. Multiple times in a listening session I have to manually drag it back down to avoid overload. I do not use AGC.
Reason: No reason
Re: Automatic LNA settings w/band
Mark - I think this is a known bug. IIRC, it only happens if you have selected 'gain' rather than 'gain reduction'.
Reason: No reason
Andy