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f4exb / sdrangel

SDR Rx/Tx software for Airspy, Airspy HF+, BladeRF, HackRF, LimeSDR, PlutoSDR, RTL-SDR, SDRplay and FunCube
GNU General Public License v3.0
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receiver channels are not isolated #659

Closed akhepcat closed 3 years ago

akhepcat commented 4 years ago

I have a LimeSDR-USB, which is mimo 2x2, so I should be able to listen to two separate frequency ranges simultaneously.

I set R0 up for some 2m decodes on Lime RX1

I then add R1, using Lime RX2

Any changes to the tuning of R0 immediately change R1, which means I can't pay attention to both UHF and VHF channels.

Also, bookmarks don't differentiate, and overload both receivers with whatever was saved.

f4exb commented 4 years ago

  1. When you exit the program only the first device set (i.e. R0) is saved as default. This is for now normal behavior. It could possibly be made different but I don't think it is a good idea to have the complete construction as the default behavior. For now there are workarounds to further configure the instance by using the REST API. To facilitate this you can use this script: https://github.com/f4exb/sdrangel/tree/master/scriptsapi#configpy

  2. In the Lime the two Rx channels share the same LO. You can only "differentiate" by using the NCO that can be set by channel. So again this is normal behavior. Same thing on the Tx side for both Tx channels. However the Rx and Tx subsystems do not share their LOs and thus Rx and Tx could be set wide apart. Edit: see the block diagram here: https://wiki.myriadrf.org/File:Lms7002m-functional-block-diagram.png

akhepcat commented 4 years ago

Ah, thanks for the clarification. I hadn't yet tried config saving with multiple SDRs attached, but I did try loading bookmarks against the Lime on R0 and my rtlsdr on R1, and that seemed to work fine.

I'll have too look into the rest api more, i guess, if i want to be able to set up some interesting configs.

Thanks.

f4exb commented 3 years ago

Question answered