My question relates to the specific programming of an R820T/ R820T2 based SDR for a specific frequency.
I'm trying to build a self contained and auto initializing Raspberry Pi 4-based (ignore that detail, not central to the question) Automated Dependant Surveillance Broadcast (ADS-B) data signal receiver/ decoder because I'm an airplane nerd.
I'm only interested in the 1090MHz band of ADS-B (There is a US-only secondary system for General Aviation aircraft called UAT which operates on 978MHz which I don't need), and if anyone can tell me where the specific 1090MHz frequency is configured.
SDR manufacturers offer pre-programmed SDR units which arrive apparently set to 1090MHz already. I'm trying to figure out how one goes about setting this frequency, or any frequency the SDR is capable of, but can't find a simple answer.
I am actually starting to wonder if the factory pre-programming is actually not a thing and they just tell them ignorant like me to keep me depending on them. This would indicate that the decoder software (Dump1090) is responsible for setting the SDR to the appropriate frequency every time the power initiation script on the Raspberry Pi runs.
How do I set the RX frequency on a R820T/ R820T2 based Software Defined Radio, that maybe I'm trying to do some Amateur Radio shenanigans with?