nunnsy
commented
5 years ago Whenever probing a receive channel's overall gain, I only ever get 12 dB when I set it to all manner of different values. The XTRX logs themselves confirm the requested gain was correctly interpreted.
... 08:34:17.272022 INFO: [LSM7] USB3_2/1/4: SXR: VCO2 [199;218] -> 208 08:34:17.272669 INFO: [LMSF] USB3_2/1/4: NCO ch=2 type=3 freq=0 [SDR: XTRX (R)] [CHAN 1] Actual Frequency: 1875000000.000000 [SDR: XTRX (R)] [CHAN 1] Setting Gain Mode (Automatic): 0 [SDR: XTRX (R)] [CHAN 1] Actual Gain Mode (Automatic): 0 [SDR: XTRX (R)] [CHAN 1] Setting Gain: 40.000000 08:34:17.272883 INFO: [LMSF] USB3_2/1/4: Set gain 40.0 to 0 on 2 channel 08:34:17.273172 INFO: [LSM7] USB3_2/1/4: RFE: set_lna(0 -> 0) => 15 [SDR: XTRX (R)] [CHAN 1] Actual Gain: 12.000000 08:34:17.274719 INFO: [CTRL] USB3_2/1/4: RFIC_GPIO 0x000300 08:34:17.276935 INFO: [USB3] USB3_2/1/4: Device closing 08:34:17.277776 INFO: [3380] IO thread termitaed with result 0
When I requested LNA only gain, this returned as 0 dB.
I've been looking at the following sections from XTRX and Soapy's libraries...
Was wondering what would cause this to occur?
while setting individual element gains does work as expected. Did anybody notice, can confirm and/or correct ?
Pawel.