Hi Nick,

I’ll ask Moe.

That would be my understanding also, and easy to test in SpectraVue.

I've just played back a NetSDR file in Continuum mode, 1300kHz span of the MW band, using 2048 point FFT and 2097152 point FFTs.

Except that the 2048 point playback zips by very quickly (unsurprisingly), it jitters around -32 dBm, while the 2097152 point playback is more sedate in speed, and with very little change in the -32 dBm value, again unsurprisingly.

The "jitter" is presumably real, as the power level of individual signals in the night-time MW band is constantly changing.

If the commenting in SpectraVue's code is anything like what was in Moe's SDR14xApp, and CuteSDR,  he probably tells you what he's doing right there.   Finding it might be another thing.

Nick




At 13:18 2022-03-17, Tony_AD0VC wrote:

I wouldn't think that the RBW matters for this. Just sum all X bins. If RBW is smaller then X will be bigger and there will be less power in each bin. Sum of the bins will be the same for a given total bandwidth.
Tony

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From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Simon Brown <simon@...> Sent: Thursday, March 17, 2022 4:45 AM To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> Subject: Re: [SDR-Radio] Continuum mode
Â

Typo.

Â

Given:

• Center frequency & bandwidth with have a count of FFT bins = X (values in dBm)
• Resolution bandwidth = Y Hz

Â

What’s the formula for the actual continuum value when these X bins are used?

Â

Simon Brown, G4ELI

https://www.sdr-radio.com

Â

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown Sent: 17 March 2022 10:39 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Continuum mode

Â

So,

Â

Given:

• Center frequency & bandwidth è Count of FFT bins = X (values in dBm)
• Resolution bandwidth = Y Hz

Â

What’s the formula for the actual continuum value when these X bins are used?

Â

Simon Brown, G4ELI

https://www.sdr-radio.com

Â

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io > On Behalf Of Conrad, PA5Y Sent: 17 March 2022 09:49 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Continuum mode

Â

Hello Simon, I really appreciate you adding this feature. I do have SpectraVue and an SDR-IP and in the past like Charles I used SDRC with Perseus and the IQ outputs as inputs for SpectraVue. Very cumbersome!

Â

Let’s get it working and then I have some other ideas.

Â

This will be really useful.

Â

73

Â

Conrad PA5Y

Â

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io > On Behalf Of Simon Brown via groups.io Sent: 15 March 2022 06:42 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Continuum mode

Â

Hi,

Â

That’s fine. I can get almost all work done, then there’s fine tuning. I think a docking window like the Signal History is the correct solution.

Â

Simon Brown, G4ELI

https://www.sdr-radio.com

Â

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io > On Behalf Of sm6fhz Sent: 14 March 2022 21:48 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Continuum mode

Â

Hi. Here is an early message (May 2014) with an tentative short-spec for the Continuum Mode: https://sdr-radio.groups.io/g/main/message/23048 73 / Ingolf, SM6FHZ

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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.

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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.

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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.

Nick Hall-Patch
Victoria, BC
Canada

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