TODO: what is Rafael Micro R820T tuner, and what is the relationship between RTL2832U and Rafael Micro R820T tuner?

RTL2832U

RTL2832U is a digital TV tuner chip designed by Realtek. It is used in a variety of consumer products, including DVB-T USB dongles.

Rafael Micro R820T tuner

R820T is a low-cost, high-performance silicon tuner that supports both analog and digital TV signals. It is used in a variety of consumer products, including DVB-T USB dongles.

Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6

Relationship

                Data Path                Control Path
[ANTENNA] --------|---------------------------|-------------
                  |                           |
                  V                           |
+------------------------+                    |
|  Rafael Micro R820T    |<-------------------|
|        Tuner           |  I²C Control       |
|                        |                    |
| - RF Input             |                    |
| - IF Output            |--------------------|
+------------------------+   IF Signal        |
                  |                           |
                  V                           |
+------------------------+                    |
|      RTL2832U          |                    |
| Demodulator & USB Int. |--------------------|
|                        |  I²C Control       |
| - IF Input             |                    |
| - USB Output           |--------------------|
+------------------------+     USB Data       |
                  |                           |
                  V                           |
[USB CONNECTION]--|---------------------------|-------------
                  |                           |
                  V                           |
+------------------------+                    |
|          PC            |                    |
|                        |                    |
| - SDR Software         |                    |
| - User Interface       |                    |
+------------------------+                    |