ELAD S3 Recording, why is the file larger than SW2 ?


Bill Nollman
 

Hi, this isn't a complaint but I'm wondering why 1 minute captured at 24MHz in SDR-Console is over 11GB while the ELAD SW2 GUI is 8GB. I see the option to capture at 16 bit but of course want the DX sensitivity of 32 bit.

Thanks,
Bill Nollman
Farmington, CT


Simon Brown
 

The reason:

60 seconds * 24 MHz * 2 (I + Q) * 4 (32-bit samples) = ~11.5 GB.

I don't know about the SW2 figures.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Bill Nollman via groups.io <billct97@...>
Sent: 14 September 2022 19:53
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 
Hi, this isn't a complaint but I'm wondering why 1 minute captured at 24MHz in SDR-Console is over 11GB while the ELAD SW2 GUI is 8GB. I see the option to capture at 16 bit but of course want the DX sensitivity of 32 bit.

Thanks,
Bill Nollman
Farmington, CT

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Jim Smith G0OFE
 

I normally record in 16 bit. Is there really that much to be gained in recording / sensitivity in 32-bit in the case of Band 2?



================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF


On 14/09/2022 19:12, Simon Brown wrote:

The reason:

60 seconds * 24 MHz * 2 (I + Q) * 4 (32-bit samples) = ~11.5 GB.

I don't know about the SW2 figures.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Bill Nollman via groups.io <billct97@...>
Sent: 14 September 2022 19:53
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 
Hi, this isn't a complaint but I'm wondering why 1 minute captured at 24MHz in SDR-Console is over 11GB while the ELAD SW2 GUI is 8GB. I see the option to capture at 16 bit but of course want the DX sensitivity of 32 bit.

Thanks,
Bill Nollman
Farmington, CT

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Bill Nollman
 

My plan is to use the RDS AutoLogger script while recording 24MHz while monitoring for Meteor Scatter. So very sensitive DX. But if there wasn't any detectable difference in sensitivity and 16 bit was smaller than ELAD SW2 that would be a big win. But how do you quantify what is lost between 32 and 16 bit? If no one knows I suppose I will have to figure that out the hard way.

Simon, your math makes sense and I can confirm that ELAD SW2 records at 8GB per minute (actually about 58 seconds). I'm not sure how they do that.

Bill


данила фадеев
 

SW2 writes with 24 bits, it seems.
I remember the agony when I tried to write from the QS1R receiver to HDSDR with a bit depth less than 32flt - all in vain and the files were huge! Setting the bit depth to less than 32flt led to damage to the recording files (there was an "overload"). And loading 32flt files into SDRDataFileAnalyser led to sad results (. Write in 16 bits, and you will be happy.
  Danila

чт, 15 сент. 2022 г. в 00:08, Bill Nollman <billct97@...>:

My plan is to use the RDS AutoLogger script while recording 24MHz while monitoring for Meteor Scatter. So very sensitive DX. But if there wasn't any detectable difference in sensitivity and 16 bit was smaller than ELAD SW2 that would be a big win. But how do you quantify what is lost between 32 and 16 bit? If no one knows I suppose I will have to figure that out the hard way.

Simon, your math makes sense and I can confirm that ELAD SW2 records at 8GB per minute (actually about 58 seconds). I'm not sure how they do that.

Bill


Bjarne Mjelde
 

I'm quite sure you gain nothing from using 32-bit recordings vs. 16-bit. I did compare the two with different kinds of DX a long time ago and found no difference. What you hear on 32-bit recordings you will hear equally well on 16-bit recordings. I don't know for MS DX of course, so setting up your own test might be useful.
--
Bjarne Mjelde
Blog: arcticdx.blogspot.com - Twitter: @Arcticlistener


 


Simon Brown
 

Not here as the S3 delivers 16-bit data anyway. 32-bit is only of use in a few cases.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Jim Smith G0OFE via groups.io <sdr-radio@...>
Sent: 14 September 2022 20:33
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 

I normally record in 16 bit. Is there really that much to be gained in recording / sensitivity in 32-bit in the case of Band 2?



================================
Need help with SDR Console? If you have a problem:
Go to https://www.sdr-radio.com/support
Please follow instructions in that link.
===================================
Jim, Bournemouth, Dorset. IO90BR.
Elad FDM-S2, Airspy HF+, SDRPlay and Funcube Dongle SDR Recievers
8-element OP-DES for Band 2, 8-element LFA for 2m, 3-element LFA for 6m, 20m Windom for HF,. Wellbrook 1530 Loop for LF


On 14/09/2022 19:12, Simon Brown wrote:

The reason:

60 seconds * 24 MHz * 2 (I + Q) * 4 (32-bit samples) = ~11.5 GB.

I don't know about the SW2 figures.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Bill Nollman via groups.io <billct97@...>
Sent: 14 September 2022 19:53
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 
Hi, this isn't a complaint but I'm wondering why 1 minute captured at 24MHz in SDR-Console is over 11GB while the ELAD SW2 GUI is 8GB. I see the option to capture at 16 bit but of course want the DX sensitivity of 32 bit.

Thanks,
Bill Nollman
Farmington, CT

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


Simon Brown
 

From memory,

the RFspace NetSDR returns 24-bit data for some sample rates, hance the option of storing as 32-bit floats. The data written is as received from the radio.

For 99.9% of cases 16-bit is fine.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Bjarne Mjelde via groups.io <bjarne.mjelde@...>
Sent: 15 September 2022 05:34
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 
I'm quite sure you gain nothing from using 32-bit recordings vs. 16-bit. I did compare the two with different kinds of DX a long time ago and found no difference. What you hear on 32-bit recordings you will hear equally well on 16-bit recordings. I don't know for MS DX of course, so setting up your own test might be useful.
--
Bjarne Mjelde
Blog: arcticdx.blogspot.com - Twitter: @Arcticlistener


 

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Bill Nollman
 

I think the S3 is natively providing 16 bit data, would others agree? In which case recording at 16 bit is exactly what I'd want? Or am I confusing specs?


Simon Brown
 

16 bit, correct.

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> on behalf of Bill Nollman via groups.io <billct97@...>
Sent: 15 September 2022 12:17
To: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
Subject: Re: [SDR-Radio] ELAD S3 Recording, why is the file larger than SW2 ?
 
I think the S3 is natively providing 16 bit data, would others agree? In which case recording at 16 bit is exactly what I'd want? Or am I confusing specs?


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