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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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Momentary Tx when changing Tx #226

Closed KC7NOA closed 5 years ago

KC7NOA commented 5 years ago

Momentary Tx when changing frequency on freq panel.

I don’t know if this is a problem with SoapySdr or the SDR program i’m using … or Lime’s drivers for Linux …

I use LimeSDR-usb on Ubuntu 18.04 with SdrAngel and when ever i change frequencies with the Tx playing and mute on (the icon with the -120DB) showing … i get a momentary Tx of signal … i have not used FM and no other mode …

Just wondering if any other FM SSB AM sdr programs show the same issue …

KC7NOA commented 5 years ago

Lime people gave this as a posibility

https://discourse.myriadrf.org/t/momentary-tx-when-changing-frequencies/3488

f4exb commented 5 years ago

Can you please describe in detail what you are trying to do? I cannot reproduce the issue with a simple scenario.

f4exb commented 5 years ago

This is my FM modulator setup on Tx side with the Lime Mini: image And the settings for the Lime mini itself: image I have a RTL-SDR listening on the Rx side: image And when I move center frequency from 435000 kHz to 435010 and back this is what I see in the Rx waterfall: image Wideband is OK too: image

So... no issues.

Note that it is very important to use the NCO with some shift in Tx mode. The modulation is very bad without it.