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SDRUno recording settings?

Posted: Thu Mar 02, 2017 4:24 pm
by sjk1000
Hi all

I'm trying to record some CW but can't seem to get the settings right.

I've set the recording directory, and the LO and VFO freqs are identical. I tune to a good strong signal, get the noise to an acceptable level, then press record. When I listen back to the file it seems that SDRuno hasn't recorded the output that I heard. What am I missing?

Thanks, Steve

Re: SDRUno recording settings?

Posted: Thu Mar 02, 2017 8:50 pm
by g1hbe
Hi Steve.
I can't answer your recording question, but the LO and the 'tuned' frequency should not be the same as this will put the received signal right on top of the local oscillator, which causes noise and distortion especially on weak signals. The received sig should always be off to one side of the centre.

Re: SDRUno recording settings?

Posted: Thu Mar 02, 2017 10:08 pm
by hfaero
If your signal of interest is 7012kHz and you are using a 2MHz bandwidth you could place the LO at say 6500kHz, well out of the way, although I guess if the LO were placed at 7000kHz you'd get the same result. Just put the LO a few kHz away from your SOI and you should be good. This applies to all tuning, whether decoding CW or listening to SSB/AM.

Standard Operating Procedure (SOP).

Re: SDRUno recording settings?

Posted: Fri Mar 03, 2017 2:31 am
by 13dka
As long you're in Low IF mode, LO frequency=tuner frequency should not matter. Where (what program) are you trying to play the recorded file? Unfortunately SDRuno doesn't record audio files (yet), only I/Q files so you can only play them back in SDRuno (and possibly other SDR software).

Re: SDRUno recording settings?

Posted: Fri Mar 03, 2017 1:55 pm
by sjk1000
Thanks for the replies

Ah, I need to go back to my ham intermediate training to appreciate the LO/VFO. Thanks for that.

Ah, again, I assumed the recording panel was for recording the very narrow audio output that I could hear. Am I right in saying that I/Q recording takes a much larger sample of the bandwidth? That's a bit exciting if that's the case.

And finally, if I just wanted to record the output from the soundcard I assume audacity does that job, or is there something lighter?

Steve

Re: SDRUno recording settings?

Posted: Fri Mar 03, 2017 2:49 pm
by W9KJO
How does one set the recording file location? Ive been looking for this.

W9KJO

Re: SDRUno recording settings?

Posted: Fri Mar 03, 2017 6:54 pm
by octave9
I had some fun with recording last night. You can start a recording by simply pressing * on the keyboard (when Uno has the focus). There's no indication that recording has started (unless I missed it), but you'll be getting large files in your 'My Documents' folder, unless you've changed where they are to go.

You can change where they go by right clicking in the Record panel and you play them in the software with 'Select Input' - 'WAV File' (which opens a file browser) from the 'Opt' dialog on the 'Main' window.

Files get big quickly if you're using 10Mb sample rate.

Re: SDRUno recording settings?

Posted: Sat Mar 04, 2017 5:55 pm
by W9KJO
In the recording panel how do you select a file for playback and then play it? When I hit the play button it does not give me any indication to select a file to play back.

W9KJO

Re: SDRUno recording settings?

Posted: Sat Mar 04, 2017 8:30 pm
by octave9
I don't think you can select one there. It has to be done with 'Select Input' - 'WAV File' (as above).

It's a great feature and I read somewhere that file sizes will be able to exceed the current 4GB 'WAV' limit in a future update.

Re: SDRUno recording settings?

Posted: Sun Mar 05, 2017 3:58 pm
by W9KJO
When I make a recording, and perhaps then make another recording, how do I select a file to play back? or how do I play back any file?

I may have missed this before or maybe did not realize what I was reading. Please help this sometimes slow ham. LOL

W9KJO 73