Flex2400 AGC

GNU Radio
1

Hi!

The AGC that is theoretically available at the analog devices chip on
the Flex2400 boards, is it turned on? Or is it even wired?

The datasheet says that there outputs and inputs, a simple rms detector
and the agc input. And if these are connected, you have an AGC.

Are they connected at sold boards?
It’s not because I want to have it turned on, but just to know.

Greetings
Dominik

2

Dominik A. wrote:

The analog RSSI indicator is available on the RFX900, 1200, 1800, and
2400, but not the 400. It is connected to the low-speed adc AUX_ADC_A1,
so you need to read that with read_aux_adc(which_dboard,0)

We should probably add this as a method in the flexrf object in
db_flexrf.py – patches welcome.

Matt

3

Alright, that means I can read the analog RSSI indicator with the
auxialiary ADCs, but it is not connected to the gain control. Instead,
an auxialiary DAC controls the gain control, right?

Thank you for the answer
Dominik

4

Dominik A. wrote:

Alright, that means I can read the analog RSSI indicator with the
auxialiary ADCs, but it is not connected to the gain control. Instead,
an auxialiary DAC controls the gain control, right

Yes, that is correct. You can reconfigure the board by moving some
resistors around to make it automatic if you wanted.

Matt