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Current draw from SDRduo when plugged into USB port

Posted: Sun Jan 20, 2019 2:57 am
by Lloyd
Does anyone know how much current the RSPduo draws from the USB port? I just got my 'duo' and it is only drawing about 5mA. I installed SDRuno and it doesn't detect the RSP. I believe the low current draw is a clue that my RSP unit is 'broken'.

Thanks,

Lloyd

Re: Current draw from SDRduo when plugged into USB port

Posted: Sun Jan 20, 2019 6:46 am
by Tech_Support
Hello Lloyd,
This result suggests that the device has not enumerated onto the USB port correctly. The device will only draw a minimal current until it has enumerated correctly. The most likely cause is a driver loading issue. Open up the device manager and if you cannot find the RSP, or it appears as an unknown device, then it would indicate a driver problem. Please first try a different cable and a different USB port. A faulty cable can still cause enumeration issues if the cable is not capable of handling the required data rate with a sufficiently low error rate. If you continue to struggle, I would suggest that you open up a support ticket at www.sdrplay.com/support

Sincerely

Tech_Support

Re: Current draw from SDRduo when plugged into USB port

Posted: Sun Jan 20, 2019 10:32 pm
by Roger
My SDRduo draws 5 ma. when plugged in but not connected to an SDR program. About 60 to 70 ma when SDRuno is started but Play not pushed and 140 ma. when SDRuno is running.

Roger

Re: Current draw from SDRduo when plugged into USB port

Posted: Mon Jan 21, 2019 10:39 am
by brooksjo
Hey guys,

How can I measure the current drawn by a USB? I've seen a thread (on WindowsSecrets forum I guess) where the guys recommend a multimeter and a hacked up cable to measure the actual USB current. Though I think there should be an easier solution.

Re: Current draw from SDRduo when plugged into USB port

Posted: Mon Jan 21, 2019 2:51 pm
by sdrom33
Broxjio it is easy, you cut a short PC USB cable and join all wires but let the red one open and place a digital tester in between the red pieces with tester at 250 ma

Re: Current draw from SDRduo when plugged into USB port

Posted: Mon Jan 21, 2019 5:23 pm
by DF1KZ
brooksjo wrote:Hey guys,

How can I measure the current drawn by a USB? I've seen a thread (on WindowsSecrets forum I guess) where the guys recommend a multimeter and a hacked up cable to measure the actual USB current. Though I think there should be an easier solution.
There are many cheap devices you can insert between the USB plug and the cable. They show you the voltage and the current.
Wolfgang

Re: Current draw from SDRduo when plugged into USB port

Posted: Tue Jan 22, 2019 12:50 am
by Roger
DF1KZ wrote:
brooksjo wrote:Hey guys,

How can I measure the current drawn by a USB? I've seen a thread (on WindowsSecrets forum I guess) where the guys recommend a multimeter and a hacked up cable to measure the actual USB current. Though I think there should be an easier solution.
There are many cheap devices you can insert between the USB plug and the cable. They show you the voltage and the current.
Wolfgang
This is the one I use. Bought it on Amazon for about 7 USD. https://www.tacklifetools.com/product/p ... dex/id/150 Gives voltage, current draw in milliamps and energy used in ma-hour.

Re: Current draw from SDRduo when plugged into USB port

Posted: Sat Jan 26, 2019 9:29 pm
by Lloyd
Thanks to all those who responded to my plea for help.

Roger, you gave me the info on the current draw. Thanks for that.

Admin, you indicated that I should re-install SDRuno. I did so, and was more patient and waited for the appropriate prompts. All is well, and I am up and running.

Lloyd