USB not always connecting, not very stable at first power-up

General discussion and support for the Peaberry SDR V2.

USB not always connecting, not very stable at first power-up

Postby mrwizardly » Thu Mar 26, 2015 1:08 am

I have been using my SDR V2 since late December. I have noticed that it takes sometimes a minute after being powered on for the USB handshaking to take place.
It will connect- then immediately disconnect. Then 15-20 seconds later reconnect.
Once it's connected it will stay connected.
I have had times when I had HDSDR up and running (not started yet) and then hear WIN XP reconnect (bong-ding) but have to restart HDSDR in order for it to start hearing what is coming in on the antenna.
Anyone else experience similar symptoms?
Seems also that once the SDR V2 has been on for sometime (regulators producing heat) I can power cycle it all I want and it reconnects every time.
Mark
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Re: USB not always connecting, not very stable at first powe

Postby TerryFrench » Thu Mar 26, 2015 3:12 am

have you tried a different (powered) USB hub or no hub at all? In case something funky is happening, and/or other devices on the same hub are interfering...
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Re: USB not always connecting, not very stable at first powe

Postby W4MMP » Thu Mar 26, 2015 3:17 am

Hi Mark,
The first and obvious question is: Have you tried a different USB port?
73
Ron / W4MMP
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Re: USB not always connecting, not very stable at first powe

Postby mrwizardly » Sat Apr 11, 2015 3:55 pm

Yes, several USB ports. This appears to be possibly a heat related problem because once the unit has been on for a while (after the initial connection) it will connect continuously, no matter what USB port I use.
Thanks
Mark
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Re: USB not always connecting, not very stable at first powe

Postby W4MMP » Sun Apr 12, 2015 12:16 am

Hi Mark,

Ah, OK. Dollars to donuts, it is a marginal solder connection on the PSoC.
73
Ron / W4MMP
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Re: USB not always connecting, not very stable at first powe

Postby mrwizardly » Fri May 08, 2015 11:49 pm

Using a SUPER magnifying scope I found that R12 one end had not been soldered. If your experience level is "first crack out of the barrel" as far as surface mount technology is concerned- carefully keep track of your work.
Will save a lot of silly debugging issues.
Thanks Ron. Good catch about the PSOC. Got me near the right area. Now it connects first time every time and stays connected without any hang-ups.
W7EAZ
Mark
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Re: USB not always connecting, not very stable at first powe

Postby W4MMP » Fri May 08, 2015 11:57 pm

Hi Mark,

Thanks for getting back to us and letting us know. It is always good for other kit builders to know the outcome of an issue.

Glad you have it working. Now go work the world :!:
73
Ron / W4MMP
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