SDR Uno - first impressions
Posted: Tue Jun 21, 2016 10:28 pm
It is going to take a while to get familiar with all the controls but the layout looks good. You can set up the various pop-up windows above the main RX display quite neatly. How to get them to stay there for next time needs investigating.
My thoughts for FM-DX use which is 98% of my interest in reception.
The key requirements are:
to be able to have a file recording the frequency / RDS PI code / PS name etc for later retrieval
RDS data automatically resetting when changing frequency
Unfiltered audio at 192 kHz sample rate - in MME - to feed RDSSpy
Note: the preset bandwidths for WFM/SFM are inadequate. 120 kHz is too narrow for full RDS sensitivity and 192 kHz is too wide. 135 kHz and 150 kHz would be good additions. I haven't attempted manually setting things yet.
A frequency scanner - CSVUserBrowser List will drive SDR Uno. As I've already got it set up to drive HDSDR I just set the com port and baud rate to match the existing set up under the CAT set-up - and away it went. One very good point the frequency stays centred. It may not be a scanner but it can step through a preset frequency list. However - not much use if RDS data isn't being recorded - but it is early days.
I/Q imbalance suppression - as good as with SDR# - around 55-60dB suppression. I presume that that it uses the auto setup in the API as you can't improve the suppression using the manual option. I would like to be able to turn off the auto I/Q imbalance to see if manula fine tuning can achieve a better result (as it does on HDSDR).
I emphasise these are my immediate thoughts and I know that it is a development project. I hope developments will be reported through this forum as I won't use Facebook.
David
My thoughts for FM-DX use which is 98% of my interest in reception.
The key requirements are:
to be able to have a file recording the frequency / RDS PI code / PS name etc for later retrieval
RDS data automatically resetting when changing frequency
Unfiltered audio at 192 kHz sample rate - in MME - to feed RDSSpy
Note: the preset bandwidths for WFM/SFM are inadequate. 120 kHz is too narrow for full RDS sensitivity and 192 kHz is too wide. 135 kHz and 150 kHz would be good additions. I haven't attempted manually setting things yet.
A frequency scanner - CSVUserBrowser List will drive SDR Uno. As I've already got it set up to drive HDSDR I just set the com port and baud rate to match the existing set up under the CAT set-up - and away it went. One very good point the frequency stays centred. It may not be a scanner but it can step through a preset frequency list. However - not much use if RDS data isn't being recorded - but it is early days.
I/Q imbalance suppression - as good as with SDR# - around 55-60dB suppression. I presume that that it uses the auto setup in the API as you can't improve the suppression using the manual option. I would like to be able to turn off the auto I/Q imbalance to see if manula fine tuning can achieve a better result (as it does on HDSDR).
I emphasise these are my immediate thoughts and I know that it is a development project. I hope developments will be reported through this forum as I won't use Facebook.
David