Hi,

What have I missed from these two pages?

https://www.sdr-radio.com/Support/Ethernet
https://www.sdr-radio.com/Support/USB

Add missing ideas here please ???? .

Simon Brown, G4ELI
=============================================

Perhaps:

I know you can't cover every case, but....

- the suggestion to try a USB 3.0 port, purely for potentially increased bandwidth even with a USB 2.0 device. This is something I've experienced.

- a note that not all add-on USB 3.0 ports are equal. In my case, the Renesas hardware and drivers proved to be the best solution for a PCIe add-in card.

- avoid connecting low-speed and higher speed devices to the same hub. Background, I had a USB Wi-Fi device running on a 5 GHz system perfectly. I needed to add a USB mouse to the system so I used an unpowered hub (yes, you mention that) and the speed dropped drastically. Could a mouse force a hub into a lower-speed mode?

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

--
Bote's Streaming Scanner Feeds
http://www.botecomm.com/bote/radio/streaming.html

dont know ... but you still did not update pluto stability with asvtx 13 c 40.000 i05 t ...

wink wink

dg9bfc sigi

ps how was the pint??

Ethernet:  Make your case for Ethernet/wired longer, showing throughput comparison perhaps and breaking out the latency issue; Also, how about a waterfall & spectrum screenshot that shows Ethernet interference on the bands?

USB: Bandwidth - show your work! Now stop grinding your teeth. :) I.e. if a PC has 4 USB 2.0 ports, it will allow only 120Mbps on each port, yes? So, show that equation and how it is used to set up SDR's.

One thing for both: explain why 'bandwidth' in this case is not about the radio itself, but how everything in the SDR--->PC system connects and why bigger is better.

Organization: move "USB Hubs" to just below "Cables," since these issues are the most common ones.

A bit pedantic, but then I was a teacher... Written guidance with visual examples increases comprehension, especially across languages, and not everyone knows the full terminology either. No, you don't need to write a complete IEEE compendium on SDR's, just quick examples.

This is to be completed by the end of the semester.

My thoughts... ;)

Brendan WA7HL

hi simon

dont know about ethernet or usb problems (cause i have none) but you can maybe chane a thing on the pluto stability page

months ago i asked you to either add the new tcxo name or better say to change it ...

(iirr i sent you a modded text that you could just replace with drag and drop but ok you can write the hp text on your own)

.....

the one that i use is asvtx 13 c 50.000 i05t (with tune pin so adding a 10 turn trimmer to finetune)

or us astx 13 c 40.000 i05 t (no tune pin so software compensation / xo correction needed

a bit better as the one from your homepage ... the taitien has 2.5ppm ... 10 times better as the original 25ppm BUT

astx/asvtx 13 ... have both 0.5 ppm ... that is not just 10 times but 50 times better as the original rakon unit

or ... 5 times better as the taitien and cost just a few bucks

................................

and you wrote about a blower added to the pluto (plus heatsinks) ... if you add a blower you should add an isolation cap above tcxo and take care that this blower does not add vibrations to the pluto

i heard one with a bad "hum noise" in his modulation on qo100 ... disconnected the blower ... crystal clear audio ... so a blower can help .... but also can hurt (reason why i use the al case as passive cooler ... big thermal mass and no vibrations)

..................................

and you wrote that you wantet to go for a pint in ferryboat in and then think about further lowering the cpu load .... so i asked how was the pint .... grin ... cpu load is now quite low now so further lowering is not needed i guess

... what i would like is a bit faster reaction in the gui (rx/tx transition sometimes is a bit slow) ...

when using the known "workaround" with running another software (thrown on taskbar) the rx to tx transition is fast (half a second?) ... with no additional soft running the reaction sometimes takes "up to a few seconds"

some versions run fast with no workaround and on some it is needed .... i know ... my atom is a slow pc ... so i do not moan about that ... but there still can be some improvements made i guess

in everyday use on qo100 i can only say that this software is working great ... only tiny cosmetics needed ...

in older versions i could "dock" tx and rx box together (to save room on my tiny screen) now it does not work anymore?? can you cange that back to dockable together in one box?? (when settings are done i just need the qrg seen one time on screen and the tx button to transmit)

i think no need for a screenshot ... or??

greetz sigi dg9bfc

Thanks David,

USB page updated. Some very good advice, especially about mixing devices on the same hub.

Simon Brown, G4ELI
https://www.sdr-radio.com

Sorry - a one word answer is not good. Let me mock-up my suggestions and stick it on Dropbox for you.

Brendan

Hi,

Just send direct to me, no problem.

Simon Brown, G4ELI
https://www.sdr-radio.com

To answer David's closing question - most definitely.
{^_^}

Has it ever occurred to you that you are allowed to look at the specification and see for yourself how it all works? The subject is WAY to big to fit here or in Simon's notes. It is not as simplistic as you ass-u-me below. It is more time than bits related when you start mixing USB 1.0, 1.1, 2.0, 2.1, 3.0, 3.1, 3.2 etc all on the same link. The slow devices to not magically speed up. So they take a totally disproportionate amount of bus time. They typically have far more overhead with small to very small data packets. There are places on the web that have this worked out in examples.

Please do not expect Simon to drop everything and write a treatise on USB.

You are a teacher. Do you expect students to do their homework? Perhaps you should do yours?

{o.o} Feeling abusive today, I guess.

From: jdow

Could a mouse force a hub into a lower-speed mode?

To answer David's closing question - most definitely.
{^_^}
===========================

Thanks, Joanne. I didn't believe it when I first saw it happening!

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-taylor@...
Twitter: @gm8arv

I found ages ago you have to be aware of the different USB hubs within your
computer.
You can test the speeds when more than one item is plugged into a particular
hub by monitoring the data transfer rate from a memory stick. The same
memory stick speed can vary by as much as ten to one depending on exactly
what is plugged into the same hub. I'd imagine you can read "SDR" for
"memory stick" and see the same variation?

USB3 can supply loads of power. I plugged in my Amazon Fire into a front
panel USB socket a few days ago. The computer could recognise it but wasn't
able to read from it.
I checked the USB cable was plugged in securely and found the whole cable
was too hot to touch. Then I saw teeth marks in the insulation.. the cat had
been chewing it. I fitted a new cable and everything then worked perfectly.

Allan G3PIY

Must be the mouse driver negotiating incorrectly.

Simon Brown, G4ELI
https://www.sdr-radio.com

dunno about that - one day I lost the ethernet link to the PC upstairs. Cat had chewed through the (appropriately enough ) the CAT5 cable.

During the design of RAF Oakhanger anchor station MoD said we had to arrange for the cables to the dishes to be safe against rodents.

Someone suggested a resident cat in the concrete duct but that may have been a bad idea if it had been taken up.

 

Yes Windows 10 looks to be finally pretty good. I can now recommend it although I will carry on using Windows 7 Ultimate because I paid full price for it…

Allan G3PIY

---

From: main@SDR-Radio.groups.io [mailto:main@SDR-Radio.groups.io] On Behalf Of Simon Brown
Sent: 28 August 2019 10:53
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Ethernet, USB Problems

 

Take one newly rescued cocker spaniel, a very expensive high-quality 3m display port cable and... suddenly the monitor went dark ☹ .

 

£16 that cost me.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Allan Isaacs

I checked the USB cable was plugged in securely and found the whole cable was too hot to touch. Then I saw teeth marks in the insulation.. the cat had been chewing it. I fitted a new cable and everything then worked perfectly.

 

Allan G3PIY

 

 

Do not forget, or perhaps become aware of, the fact that USB devices can reserve bandwidth even if they are not actively using it. If it happens to be a 1.0 device that reserves 25% of the USB 1.0 bandwidth, that is reserving 25% if the TIME available on the USBx port into which it is connected. So a 1.0 device reserving a puny 375 kbps on a USB3.2 port has just consumed 2.5 gbps worth of time on the USB 3.2 port into which you plugged it.

I have heard of hubs that buffer and don't cause this speed penalty by rate converting lower speed units to the hub's rated speed. I have never to my knowledge met one.

{o.o}