Gain (reduction) settings via the API
Posted: Thu Oct 19, 2017 8:45 am
I have tried to understand the API documentation and the various documents about how to manage the gain settings but I must admit that I'm having problems.
Using SDRUno I can see the signal that I'm trying to capture in my program. The settings I use in SDRUno are:
- IF AGC option is off and the slider set to 59dB
- the GR slider in the main window is at the top and the legend next to it ways 84dB
- in the Rx Control window, the AGC option of 'fast' is selected and the AGC tab in the settings window has the following values: att = 10.1, hold = 496 and rel = 603
- in the same window int he SAM/HP tab, the PLL AGC setting is 604 rel
If it matters, I'm using the B antenna with the bias-t turned on (there is a mast-head LNA in use).
I must admit that I really don't understand what these settings really mean, and I may well have missed some that are relevant.
How do I achieve configuring the RSP2 to approximately the same configuration using the API?
Is there a document (other than the API Spec and the AGC Technical note (which is nearly incomprehensible to me and I consider myself fairly knowledgeable on such things) that can explain how the gain settings work, how they interact and how to achieve various effects - I'm particularly interested in how to catch weak signals (such as the NOAA satellites) and local FM radio stations (which are rather strong).
Susan
Using SDRUno I can see the signal that I'm trying to capture in my program. The settings I use in SDRUno are:
- IF AGC option is off and the slider set to 59dB
- the GR slider in the main window is at the top and the legend next to it ways 84dB
- in the Rx Control window, the AGC option of 'fast' is selected and the AGC tab in the settings window has the following values: att = 10.1, hold = 496 and rel = 603
- in the same window int he SAM/HP tab, the PLL AGC setting is 604 rel
If it matters, I'm using the B antenna with the bias-t turned on (there is a mast-head LNA in use).
I must admit that I really don't understand what these settings really mean, and I may well have missed some that are relevant.
How do I achieve configuring the RSP2 to approximately the same configuration using the API?
Is there a document (other than the API Spec and the AGC Technical note (which is nearly incomprehensible to me and I consider myself fairly knowledgeable on such things) that can explain how the gain settings work, how they interact and how to achieve various effects - I'm particularly interested in how to catch weak signals (such as the NOAA satellites) and local FM radio stations (which are rather strong).
Susan