After having installed my new Uputronics Filtered Preamp, I noticed the noise level on my stats page jump up. This triggered me to look in to optimising my gain settings, which I’ve been trying to do over the past couple of days but without much luck.
Part of the problem I’m having is figuring out what level of noise is acceptable. Prior to installing the preamp, noise was around -30dBFS, which jumped to around -20dBFS when the preamp was installed. This is to be expected - but is that acceptable? What effect is the filter having - is the noise level acceptable because there’s a good filter in place, or is any noise bad?
I reduced my gain down to 22.9db which bought my noise level to around -30dBFS again, but then I worried that I was just negating the amplification from the preamp. Bringing the gain back up to 43.9db increases the number of messages >3dBFS and also increases the noise, but does this mean I’m going to see more traffic from further away? I’m situated underneath the flight path for a large international airport (although aircraft are usually between 15,000-20,000ft above my house), but am also very close to two smaller airports with a lot of GA activity during the day which can be anywhere from 500-1000ft.
In short - I have no idea what I’m doing and am trying to make sense of this all, so any information anyone can provide would be extremely helpful! I’ve attached a screenshot of my signal level stats if it’s any use - the blip at the end is me increasing the gain from 22.9 to 43.9.
In terms of equipment… 3.3dbi ADS-B Antenna -> Uputronics ADS-B Filtered Preamp -> FA ProStick+. It’s all currently situated in my loft.