Linear power supply does not work with XU3 Lite

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o00scorpion00o
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Linear power supply does not work with XU3 Lite

Unread post by o00scorpion00o » Thu Apr 11, 2019 8:54 pm

Hi all,

I am trying to set up the xu3 lite as an sdr radio using spy server and the Airspy HF+ Sdr receiver.

I have a spare linear pay lying around that I used in the Kiwi SDR that uses a beaglebone black and it worked with it no issue.

When I connect to the xu3 it powers up and attempts to boot then shuts off reboots and keeps repeating this cycle. It’s a 3.5 amp supply could probably even push 4 amps , it worked perfectly with kiwi and beaglebone so why would it not work on the Xu3 ?

I need a linear psu because the normal switch mode psu creates lots of RF interference that is picked up on the sdr and the linear supply is clean.

The difference with the kiwi is that the beaglebone gets its power from the kiwi board which attaches direct to the beaglebone board, the power does not go direct to the beaglebone.

phaseshifter
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Re: Linear power supply does not work with XU3 Lite

Unread post by phaseshifter » Thu Apr 11, 2019 10:12 pm

have you measured the psu output with a dmm..you need a stable voltage between 4.8~5.3 volts @4 amp continuous...
if you can measure pin one of the 30 pin header in real time with a dmm and watch the voltage drop..???
sounds to me that it is not up to the job..

other issue may be that you have a bad flash on your media..
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o00scorpion00o (Thu Apr 11, 2019 10:39 pm)
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o00scorpion00o
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Re: Linear power supply does not work with XU3 Lite

Unread post by o00scorpion00o » Thu Apr 11, 2019 10:40 pm

I will monitor the voltage, I would imagine that if it can power kiwi + beaglebone black that it should power the Xu3 ?

Thanks for the pin 30 tip, that will be convenient.

Image is fine, works with standard PSU.

phaseshifter
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Re: Linear power supply does not work with XU3 Lite

Unread post by phaseshifter » Thu Apr 11, 2019 11:11 pm

pin "one" on the 30 pin header conn10
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o00scorpion00o (Thu Apr 11, 2019 11:30 pm)
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