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SD card extender
#11
This all gets into transmission line theory.
VSWR, inductive and capacitive coupling...

Even circuit board design has to take into account these effects. The analytical tools are generally part of the PCB designers CAD software suit.
[Image: TGgs30I.jpg]
"Since this country was founded, each generation of Americans has been summoned to give testimony to its national loyalty. The graves of young Americans who answered the call to service surround the globe."  JFK Jan 20, 1961
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#12
I have a Vivitar 50 IN 1 USB card reader that I use on my Mac. The Mac doesn't have a built in slot. It is plugged into one of my many powered hubs and works fine. Don't know why they call it a 50 IN 1 as there are 5 slots on it.

This may be another option to try. BTW I find I get the best results if I unmount the reader and put in the card and then remount it. (In other words, disconnect the reader, put the SD card in it, and then plug it back in). I have formatted a different SD card on it for another system and it worked fine.

Homer
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#13
(10-20-2014, 11:51 AM)Homerec130 Wrote: I have a Vivitar 50 IN 1 USB card reader that I use on my Mac. The Mac doesn't have a built in slot. It is plugged into one of my many powered hubs and works fine. Don't know why they call it a 50 IN 1 as there are 5 slots on it.

This may be another option to try. BTW I find I get the best results if I unmount the reader and put in the card and then remount it. (In other words, disconnect the reader, put the SD card in it, and then plug it back in). I have formatted a different SD card on it for another system and it worked fine.

Homer

Defeats the purpose the OP wanted -- the ability to have SD card elevated for easier access since the OP's machine is on the floor.

If the OP must reach for the machines SD slot to use the extender, then the OP may just as well not use the extender.

I think, more than a transmission issue, this is a "card presence' issue.

(What did you fly homer?)
[Image: TGgs30I.jpg]
"Since this country was founded, each generation of Americans has been summoned to give testimony to its national loyalty. The graves of young Americans who answered the call to service surround the globe."  JFK Jan 20, 1961
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#14
(10-20-2014, 02:01 PM)justMongo Wrote: I think, more than a transmission issue, this is a "card presence' issue.

I think that is correct. This isn't a speed of data issue nor a delay in timing or even crosstalk, but a simple presence issue.

Neither snow nor sleet nor excess cable length will stop the performance of the SD cable extension but if the slot in the receiving machine detects the open cable as an SD card, an error message will result that prevents further progress. Smile

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#15
This thread reminds me of a joke I heard once.

Three professors from Yale, Harvard, and MIT were attending the execution of a murderer. When the execution goes awry because the electric chair fails to operate, the Law Professor from Yale interprets the miscue as ‘foundation for legal jeopardy’. The Harvard Divinity School Professor proclaims the event an ‘Act of God’, demanding the immediate release of the convicted felon. Finally the MIT Professor wryly suggests that the executioner try inserting the power cord into the wall socket.

The obvious isn't always so obvious any more than common sense is all that common. Big Grin
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#16
other words ... Don't Do It !
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#17
(10-20-2014, 02:01 PM)justMongo Wrote:
(10-20-2014, 11:51 AM)Homerec130 Wrote: I have a Vivitar 50 IN 1 USB card reader that I use on my Mac. The Mac doesn't have a built in slot. It is plugged into one of my many powered hubs and works fine. Don't know why they call it a 50 IN 1 as there are 5 slots on it.

This may be another option to try. BTW I find I get the best results if I unmount the reader and put in the card and then remount it. (In other words, disconnect the reader, put the SD card in it, and then plug it back in). I have formatted a different SD card on it for another system and it worked fine.

Homer

Defeats the purpose the OP wanted -- the ability to have SD card elevated for easier access since the OP's machine is on the floor.

If the OP must reach for the machines SD slot to use the extender, then the OP may just as well not use the extender.

I think, more than a transmission issue, this is a "card presence' issue.

(What did you fly homer?)

With the card reader you could also attach it to a USB extension and put the female end of the cable on the desktop. Plug the SD reader into that. Or you could attach a powered USB hub to the back of the computer and put it on the desktop and go from there.

Homer


I flew as an Navigator/Instructor Navigator on KC-135s (air refuelers), E-3s (AWACS) and EC-130Hs (comm jammers). Great job.

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#18
Buy Toshiba wifi-card and leave the card in the machine.
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#19
(10-21-2014, 01:14 PM)Lazer1234 Wrote: Buy Toshiba wifi-card and leave the card in the machine.

Toshiba calls their version of such devices "Flashair" (available in 8, 16 and 32 GB) and there are competitors who also have SD cards + wifi. The 8 GB Toshiba is $26.95 on Amazon, worth every penny if it really eliminates needing to schlep the SD card back and forth all the time. How often have I gone to bed and left the SD card in the computer, only to discover my error the next morning?

But before I spend the money, is anyone actually using one of these things and will my S9 Autoset (and other CPAP machines) use it?
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#20
Thanks for all the info about the SD card extender. I will do some research into the flashair.
I too also forget to put the card back in. It would be nice if the flashair would work.
When I have time to play with it, I will get back with the results unless some one has already used it. Thanks, Brad
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