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SD card extender
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justMongo Offline

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Post: #11
RE: SD card extender
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.

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
10-20-2014 11:01 AM
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Homerec130 Offline

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Post: #12
RE: SD card extender
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
10-20-2014 11:51 AM
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justMongo Offline

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Post: #13
RE: SD card extender
(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?)

INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
10-20-2014 02:01 PM
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surferdude2 Online

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Post: #14
RE: SD card extender
(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
10-20-2014 02:10 PM
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surferdude2 Online

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Post: #15
RE: SD card extender
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
(This post was last modified: 10-20-2014 02:30 PM by surferdude2.)
10-20-2014 02:27 PM
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Whitewabit Offline

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Post: #16
RE: SD card extender
other words ... Don't Do It !
10-20-2014 05:50 PM
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Homerec130 Offline

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Post: #17
RE: SD card extender
(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.
10-21-2014 12:11 PM
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Lazer1234 Offline

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Post: #18
RE: SD card extender
Buy Toshiba wifi-card and leave the card in the machine.
10-21-2014 01:14 PM
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JJJ Offline

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Post: #19
RE: SD card extender
(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?
10-21-2014 03:36 PM
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car54 Offline

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Post: #20
RE: SD card extender
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
10-21-2014 05:56 PM
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