RTL-SDR displayed bandwidth.

[G4EWJ]

I've finally acquired a Portsdown4 and I'm exploring its many wondrous features.

With an RTL-SDR, the displayed bandwidths seems to be 0.5MHz and 1MHz, rather than the 1MHz and 2MHz values shown on the menu and graph.

This is version 202301020 with a 7 inch screen.

Brian
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[G8GKQ]

Hi Brian

Not sure how I missed this in testing - very embarassing!

I've reproduced the fault and will work on a fix.

Dave

[G4EWJ]

You can't catch everything.

It's quite handy really. Can you leave it as a third option?

Brian

[G8GKQ]

Hi Brian

I have identified the problem. I left a testing setting in the final build. I will fix it in the next Portsdown update, but if you want to correct it in the interim, open the file /home/pi/rpidatv/src/rtlsdrview/rtlsdrfft.c and uncomment line 84 and comment out line 85, so it looks like this:

Code: Select all

#define DEFAULT_SAMPLE_RATE 2048000
//#define DEFAULT_SAMPLE_RATE 1024000

then run the command

Code: Select all

/home/pi/rpidatv/scripts/utils/ubvr.sh

to compile the corrected version. Then restart the BandViewer.

I'll push a Portsdown 4 update to fix this asap.

Dave, G8GKQ

[G8GKQ]

I'll work on the 500 kHz bandwidth option as a slower time task.

Dave

[G4EWJ]

Thanks.

Brian

[G8GKQ]

I have just released a Portsdown 4 update with a fix for this problem. Just update to the latest version if you want this fix.

I will work on implementing the 500 kHz span width selection in a future update.

Dave, G8GKQ

[radiogareth]

Works for me, very handy for /P. The 50MHz of the Pluto and its frequency coverage really is an outstanding feature (too)!!
Thanks
Gareth

[G8GKQ]

I have now released updates for both the Portsdown 4 and the Portsdown 2020 which include (corrected!) span widths of 500 kHz, 1 MHz and 2 MHz for the RTL-SDR BandViewer.

I have also added a very basic RTL-SDR BandViewer capability for those Portsdown 2020 users with Waveshare 3.5 inch screens. Please read the wiki entry here (and do a software update!) before trying to use it. https://wiki.batc.org.uk/Portsdown_Band ... he_RTL-SDR

Dave G8GKQ

[G4EWJ]

Is 202301100 the latest version for Portsdown4? I'm not seeing the 500kHz option on the RTL-SDR band viewer.

Brian