Explanation of messages please

General Discussion
1

As I setup the mini sdr v2 I get the following messages. Can someone tell me which ones are errors and how to correct them?

thanks,
set_rx_frequency:448 Set RX frequency 1400000000.000000

set_rx_bandwidth:519 Set RX bandwidth 312500.000000

RXLPF set to 1.400 MHz (requested 0.312 MHz [out of range])

RX LPF configured

set_rx_bandwidth:534 Get RX bandwidth 1400100.000000

set_rx_samplerate:564 Set RX sample rate 274285.000000

SetFrequencyCGEN(1.09714 MHz) - cannot deliver requested frequency

set_rx_samplerate:568 error setting RX sample rate (SetFrequencyCGEN(1.09714 MHz) - cannot deliver requested frequency)

set_rx_samplerate:576 RX sample rate host 15359999.757064 link 15359999.757064

set_rx_gain:619 Set RX gain 40

set_rx_agc_mode:706 fixme

Calibrating Rx for 2.5 MHz (requested 0.3125 MHz [out of range])

Rx calibration finished

set_tx_frequency:471 Set TX frequency 1400000000.000000

set_tx_bandwidth:494 Set TX bandwidth 312500.000000

TXLPF set to 5.000 MHz (requested 0.312 MHz [out of range])

Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active

TX LPF configured

set_tx_bandwidth:511 Get TX bandwidth 5000000.000000

set_tx_samplerate:543 Set TX sample rate 274285.000000

SetFrequencyCGEN(1.09714 MHz) - cannot deliver requested frequency

set_tx_samplerate:547 error setting TX sample rate (SetFrequencyCGEN(1.09714 MHz) - cannot deliver requested frequency)

set_tx_samplerate:555 TX sample rate host 15359999.757064 link 15359999.757064

set_tx_gain_relative:599 Set TX gain 50

rxtx_init:693 fixme

Calibrating Tx for 2.5 MHz (requested 0.3125 MHz [out of range])

Tx calibration finished

configure:248 Lime SDR Mini V2 is configured

2

This is the only error, it means such low sampling rate cannot be achieved directly, to workaround that when requesting sampling rate, specify higher oversampling ratio.

Rx Low pass filter has a range of 1.4 - 130 MHz, you are requesting value outside of the range, so filter is being set to the lowest closest value of 1.4MHz.

Tx low pass filter has a range of 5 - 130 MHz, same as with Rx, it gets set to closest value to your requested.

The calibration algorithm has a minimum supported target bandwidth, so it performs the procedure using value closest to your requested.

3

The rate I am asking for is ok for the range reported by the sampling get range.
configure:138 rx sample rate range min 100000.000000 max 30720000.000000 step 0.000000
configure:142 tx sample rate range min 100000.000000 max 30720000.000000 step 0.000000

Why is the step size 0.0? Shouldnt it be 1.0?

AWhat is wrong with 274285 with an oversample of 1 or 2 I get the same error. Does this number have to be some harmonic of 1.09 Mhz?

M-

4

It’s a bug.

As mentioned in Desired sample rate to best sample rate for mini v2 - #4 by ricardas
CGEN as to be at least 5 MHz, so according to the equation using oversample of 2, brings it to only 2.19MHz, you need oversample of at least 8, to have CGEN more than 5MHz. Sample rate does not need to be harmonic of any number.