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SAQ 17.2 kHz QRV today
sm6fhz
Hi.
Out of topic for this group, but there may be some of you who are interested. SAQ, 17.2 kHz will transmit today starting at 1130 UTC with tuning and sending message at 1200 UTC https://alexander.n.se/alexanderson-day-2021/ Enjoy! 73 / Ingolf, SM6FHZ
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Re: 3D waterfall
Paul White
On Sat, Jul 3, 2021 at 06:08 AM, Simon Brown wrote:
3D may be the last frontier in SDR UIsThe last... Only because we can't visualise more. Given some future capability to discriminate az/el of arrival, a total 5D would be informative. Meanwhile... 1) An automatic "phase-out" of the strongest signal on a tuned channel (semi-transparent), showing what's underneath (solid) 2) Compare current reception with a historical reference (synchronised time of day). Colour/transparency to distinguish the two. Re 2, (though of little interest to amateurs) I think there's a huge opportunity for new tools to alert us to changes in propagation, channel occupancy, whatever.
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Re: Recordings Stuttering
James Niven <jniven@...>
Thanks very much jdow, for your very detailed information. Just a thought, are there adaptors that can plug into a say a usb2 port and convert it to a usb3 port or will there be no difference?? Thanks again
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, July 3, 2021 9:11 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Recordings Stuttering
Ah, nope - if you have all USB2 devices on the bus a USB3 port is not a solution except MAYBE in very marginal cases. If the ELAD is USB 3 (blue tongues) then it may make a major difference. (White tongues are USB 2. Wikipedia has at least one article that delineates what the tongue colors mean.) On 20210703 18:45:53, James Niven wrote:
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Re: 3D waterfall
Max
On Sun, Jul 4, 2021 at 09:54 AM, Simon Brown wrote:
Why put a GPU in a PC when the GPU is no better than the CPU’s own graphics? I don’t get it…Looks like it's an "either/or" as specified at time of purchase. To do with either discrete or shared memory by the look of it: https://dl.dell.com/topicspdf/inspiron-17-7706-2-in-1-laptop_users-guide_en-us.pdf Max
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Re: S Meters
Max
Hi Simon
Is it worth adding a small para about use of Visual Gain to calibrate the noise floor with no signal present (antenna disconnected) assuming that's a valid method, and so also therefore a mention of which radios have the Visual Gain feature? Or perhaps just give Visual Gain it's own section with a link to it from the S-Meter section? It's just that Visual Gain is a very useful feature but it's true function seems to confuse some people quite a bit judging from the Forum posts. Max
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Re: 3D waterfall
Simon Brown
Hi,
I expect you can disable the NVIDIA GPU from BIOS, then I expect the video recorder to work.
Why put a GPU in a PC when the GPU is no better than the CPU’s own graphics? I don’t get it…
Simon Brown, G4ELI
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Patrick
Sent: 04 July 2021 09:40 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] 3D waterfall
[Edited Message Follows] Hi Bob,
The fact is when I tick the corresponding feature from the 'display' menu, CUDA is enabled ! At least it is shown as enabled. See attachment.
Maybe Simon can explain why ... -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Re: 3D waterfall
Hi Bob,
The fact is when I tick the corresponding feature from the 'display' menu, CUDA is enabled ! At least it is shown as enabled. See attachment.
I can also use OpenCL, as expected. Maybe Simon can explain why ... EDIT : Simon already explained ! Sorry !
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S Meters
Simon Brown
Hi All,
Following Conrad’s thread I’ve updated Software Defined Radio (sdr-radio.com) so if there are any questions let me know and I’ll add more text or diagrams.
Simon Brown, G4ELI
-- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Re: 3D waterfall
Simon Brown
Patrick,
That’s interesting – they’ve added NVIDIA® GeForce® MX350 even though you have Iris graphics, this is why CUDA options are available.
UserBenchmark: Intel Iris Xe vs Nvidia GeForce MX350
Shows almost no difference, so why did they do this?
Simon Brown, G4ELI
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Patrick
Sent: 03 July 2021 21:04 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] 3D waterfall
Here's a link (to the french Dell page) : https://www.dell.com/fr-fr/shop/ordinateurs-portables-2-en-1/ordinateur-portable-inspiron-17-2-en-1/spd/inspiron-17-7706-2-in-1-laptop -- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Re: 3D waterfall
Simon Brown
toggle quoted messageShow quoted text
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of BobS via groups.io
Sent: 04 July 2021 02:38 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] 3D waterfall
Here's a GPU-Z screen shot for an integrated Intel Xe graphics for an Intel i7-1165G7. You can see that CUDA is not supported, but OpenCL is.
-- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Re: Recordings Stuttering
jdow
Ah, nope - if you have all USB2 devices on the bus a
USB3 port is not a solution except MAYBE in very marginal cases.
If the ELAD is USB 3 (blue tongues) then it may make a major
difference. (White tongues are USB 2. Wikipedia has at least one
article that delineates what the tongue colors mean.)
toggle quoted messageShow quoted text
If the ELAD itself works on USB2 with all the usual "stuff" on USB 2 then a laptop with some USB3 and some USB2 sockets should work a treat. {^_^}
On 20210703 18:45:53, James Niven
wrote:
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Re: Recordings Stuttering
jdow
Unfortunately I do not have a pointer to it. The
short version with regards to USB 3 with attached USB 2 devices
(or USB 2 with attached USB 1 or 1.1 devices) involves time rather
than data rate issues.
toggle quoted messageShow quoted text
Every time a lower rated USB device tries to transfer data on a higher rated hub (port) the whole bus slows down to the lower rate for the duration of the transfer. This consumes time on the bus. So a 1.1 device may consume maybe 40 times as much of the nominal bandwidth on the port. Furthermore for perceived response on your screen mice send very small messages with fairly large overhead with a payload value of 1 mouse step. It's a bit difficult to get a mouse to actually send a payload of say 42 mouse steps. So what might be a (swag alert) 3 byte transfer turns into a (swag) 15 or 20 byte handshake plus transfer all at 10 MB/S or so. That's 50 to 90 megabytes/second carved away from the nominal 400 megabytes/second on the bus. So slow devices eat your hub's capability FAST. That is why AirSpys have trouble at 10 Msps on a USB2 bus that should "easily" handle the bit packed transfer rate of an AirSpy. The full USB2 bus is seldom really there. And if you hook up to a USB 3 hub you are still stuck with the AirSpy eating 3/4 of the bus bandwidth give or take a little. Anything else on that bus, say an external drive or an internal DVD drive can cause extreme stuttering or outright failure. (All numbers are Scientific Wild Assed Guesses rather than correct to more than 1 decimal place. The concept is what is of concern in the numbers above. If my memory serves the numbers are "close" if not exact.) {^_^}
On 20210703 16:08:57, James Niven
wrote:
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Re: Recordings Stuttering
jdow
On USB2 I have found that it is rare to be able to
write faster than 10 MB/S. On top of that you are trying to read
another 20 or more MB/S reading from your source. It isn't going
to work. It will be close; but, it will not win the cigar.
toggle quoted messageShow quoted text
{^_^}
On 20210703 16:06:52, James Niven
wrote:
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Re: Recordings Stuttering
James Niven <jniven@...>
Hi Nick,
Thanks for this information, I actually forgot how to get to the “write-caching” properties to make sure nothing had changed, thanks for that. I did set this way back when I brought the external hard drive, I just checked the settings and yep, still good.
It’s funny, I use the same external hard drive on my overnight recordings from Jaguar Pro and have no issues with the recordings. It only seems to be with SDR Console when recording FM frequencies and store for later playing that I find the stuttering. It seems to be what Max and Joanne suggest, the usb 2 port, should be usb 3 for better transmission of data.
Thanks
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Nick Hall-Patch
Sent: Saturday, July 3, 2021 6:52 PM To: main@SDR-Radio.groups.io; main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Recordings Stuttering
Is this the age-old "write-caching" problem, James? It snags me every year or two.
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Re: 3D waterfall
Here's a GPU-Z screen shot for an integrated Intel Xe graphics for an Intel i7-1165G7. You can see that CUDA is not supported, but OpenCL is.
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Re: 3D waterfall
CUDA is proprietary to nVidia. CUDA does not exist on Intel Xe graphics. You can use OpenCL. Bob, W4RLS
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Re: Recordings Stuttering
Nick Hall-Patch
Is this the age-old "write-caching" problem, James? It
snags me every year or two.
toggle quoted messageShow quoted text
Bring up Properties for your drive in (right-click on it in Explorer), Hardware tab, highlight the drive, Properites again, "Change Settings", Policies. In Removal Policy, choose "Better Performance", and enable Write Caching. I hope I'm not stating the obvious, hi. (just because it's never obvious to me..) best wishes, Nick
At 21:17 2021-07-03, James Niven wrote: Hi Group,
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Re: Recordings Stuttering
James Niven <jniven@...>
Thanks Max, I hope Joanne can point me to her excellent post, would love to read this and learn more.
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Max
Sent: Saturday, July 3, 2021 5:45 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Recordings Stuttering
On Sat, Jul 3, 2021 at 10:17 PM, James Niven wrote:
Hi James. I guess one would need to know what is exact external drive make/model and how is it connected to the PC? Many PCs still have a mix of USB 2.0 and USB 3.0 ports. It's very easy to plug a USB 3.0 drive into a USB 2.0 port. I don't know if it's a universal standard, but often the USB 2.0 ports are black inside (well, the plastic "tongue" inside the socket anyway) and the USB 3.0 ports are marked blue. Needless to say USB 3.0 drive in USB 2.0 port is choked right from the start.
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Re: Recordings Stuttering
James Niven <jniven@...>
Thanks for the quick reply jdow, it appears I have usb2 ports, so after reading what Max and yourself mention, this may well be my issue. So, I guess for now, I have to save to my c drive. Thanks again!!
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, July 3, 2021 4:31 PM To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] Recordings Stuttering
Drive not fast enough is a real possibility for an external drive, especially if it is USB2. Even if it is on the same USB3 bus as the elad S2 there still can be problems if either device is USB2 because the bus slows down to operate with USB2 transfers. If you can record OK to the internal drive then it almost certainly is the external drive causing problems for one reason or another. On 20210703 14:17:47, James Niven wrote:
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Re: Recordings Stuttering
Max
On Sat, Jul 3, 2021 at 10:17 PM, James Niven wrote:
Hi James. I guess one would need to know what is exact external drive make/model and how is it connected to the PC? Many PCs still have a mix of USB 2.0 and USB 3.0 ports. It's very easy to plug a USB 3.0 drive into a USB 2.0 port. I don't know if it's a universal standard, but often the USB 2.0 ports are black inside (well, the plastic "tongue" inside the socket anyway) and the USB 3.0 ports are marked blue. Needless to say USB 3.0 drive in USB 2.0 port is choked right from the start. There is generally nothing inherently slow about external drives, and I have USB 3.0 drives that can transfer files at 100 Mb/s (single file performance, not multiple). As Joanne says, it's just hardware bottlenecks that are the problem, i.e. drive physical write/read speed, and connection speed. Joanne wrote an excellent post about USB ports a few months back, but not sure where it is now....... Joanne? But essentially, to repeat what she already says, don't mix USB 2.0 and 3.0 devices on the same bus at the same time. The USB 2.0 will drag down the whole transfer rate. Max
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