Receive window looses waterfall on tune

[VK7ZA]

When I tune, they receiver window waterfall goes blank, and starts again.

While I'm not 100% sure, I don't think this used to happen as my workflow is to use the small receive window to tune to a signal with greater precision whilst leaving my main display with the full band view. Tuning now seems awkward so don't think it was like this before.

Please see the below video demonstrating what I'm talking about. I have been changing some settings of late, and my hypothesis is that I've inadvertently changed something, but despite trying, can't find a way to restore what I think was the previous behaviour where the receiver waterfall never cleared on tuning. Note that in the video the little window is the DSP panel, but the same behaviour happens with the receiver panel.

Any thoughts?

Kind regards,
Lance

[Max]

I've tried to emulate this behaviour with HL2, HF+ Discovery and my RSP2Pro and I cannot reproduce it. It's odd that the waterfall blanks in the RX window and the IF window but not in the main window. My guess is that has to be a clue, but what I'm not sure. Will keep thinking about it.

At the moment I can only suggest downloading and installing the latest Beta and try again:

https://www.sdr-radio.com/download#Beta

Max

When I tune, they receiver window waterfall goes blank, and starts again.
While I'm not 100% sure, I don't think this used to happen as my workflow is to use the small receive window to tune to a signal with greater precision whilst leaving my main display with the full band view. Tuning now seems awkward so don't think it was like this before.
Please see the below video demonstrating what I'm talking about.

[VK7ZA]

Thanks for your response Max. At least that confirms that something is currently amiss.

I created a new identity, and wouldn't you know it, it works perfectly. So there's something in my identity settings which is causing it. I methodically duplicated all the settings from my main identity to the new one, and in the end the new identity continues to work as expected. So my problem's solved, but the cause remains unknown.

Now to see if I can swap identities to make my new one the primary identity.

I've tried to emulate this behaviour with HL2, HF+ Discovery and my RSP2Pro and I cannot reproduce it.

[jdow]

No picture showing settings. No information about the computer. How are we supposed to help? Pulling suppositions about his setup out of the air doesn't help. Nonetheless I'll pull a guess out of thin air, his computer is memory starved so the usual cached chunks of spectrum to facilitate scrolling and the like had to be put aside in SDRC's program execution.

Of course, data may show that is a bad supposition.

{^_^}

[Max]

No picture showing settings. No information about the computer. How are we supposed to help? Pulling suppositions about his setup out of the air doesn't help. Nonetheless I'll pull a guess out of thin air, his computer is memory starved so the usual cached chunks of spectrum to facilitate scrolling and the like had to be put aside in SDRC's program execution.

Ah yes, good point. I just went back and ran SDRC with my RSP2Pro and one receiver active in SDRC. My CPU load as shown at bottom right of the SDRC window shows 0.3% at idle and maybe goes up very briefly to around 3% when changing frequency then quickly stabilises back to about 0.2-0.3%

I notice in your video Lance, your CPU peaks up around 20%. That does not sound overloaded, but possibly an issue especially if you have no GPU so integrated graphics perhaps.

Also you don't say or show how many receivers you have running in SDRC. IS it just RX1 or do you ae 20 other receivers running in the background?!

As Joanne says, more info needed about computer type, CPU, GPU, number of simultaneous receivers etc.

Max

[VK7ZA]

I notice in your video Lance, your CPU peaks up around 20%. That does not sound overloaded, but possibly an issue especially if you have no GPU so integrated graphics perhaps.

Also you don't say or show how many receivers you have running in SDRC. IS it just RX1 or do you ae 20 other receivers running in the background?!

As Joanne says, more info needed about computer type, CPU, GPU, number of simultaneous receivers etc.

Max

OK, here's some additional system info.
- CPU: i7-9700 @ 3.00 GHz
- RAM: 16 GB
- GPU: none
- OS: Win 11 25H2
- SDR: RSPdx

I am only running a single instance of SDRC, with one receiver.

As mentioned in my previous post, I've resolved the issue, so further investigation is purely academic.

Ta, Lance

[Max]

As mentioned in my previous post, I've resolved the issue, so further investigation is purely academic.

Ta, Lance

Apologies Lance. Somehow I missed that post. Glad you got it sorted.

For the record I don't see anything particularly lacking in your setup. Lack of a discrete GPU does most likely explain the much higher CPU use compared to my own setup.

If you ever get into running multiple receivers using, say, the RX Matrix on another monitor and the performance is at all lacking then you might consider installation of a GPU card.

It seems integrated graphics on your i7-9700 is Intel UHD 630. Even a used Nvidia GTX-1650Super (note the Super, not the "vanilla" 1650) that can now be purchased on eBay for lowish cost would be a very worthwhile upgrade and would slash your CPU usage. I am seeing used GTX1650Super cards for sale here in the UK on eBay and Facebook Marketplace at around £60-70 (GBP). Very well Worth considering I would say. You would particularly notice a huge difference in CPU usage if you want to do video recordings in SDRC and also data recordings I would guess would benefit if that's your thing.

Max

[VK7ZA]

No problem Max. I now have a mini-PC with no capacity to add discrete graphics. I used to have an older desktop with very strong graphics which ran SDRC superbly which went to a family member who needed to do a lot of video editing. So yes, a good GPU is the key to software like SDRC. C'est la vie.

[jdow]

If there is a spare NVME slot or you are lucky enough to have a PCIe expansion bus connector there are extensions that can plug into that along with docks for the GPU. That is a bit of a stretch, though. Jeff Geerling does this with ARM based tiny computers. He's managed to run a top end video card from a very little ARM computer using this sort of expansion.

{^_^}