Marcus,
I figured out the flash issue! It was related to the power switch
issue. There are four screws that go into the top and bottom of the front
panel of the chassis. Two from the bottom, two from the top. One of the
screws in the bottom was either too long, or not supposed to be there. The
one closest to the power switch was actually pushing on the bottom of the
board. Removing that screw released pressure on the switch, freeing it up
to work normally. Once that was fixed, the device had no problem reading
its flash. Dunno what was happening, and why it didn't cause other issues,
but now the radio powers on with no issue and all interfaces come up after
a second or two :D
The issue of the daughtercards is a little more troublesome. I hooked
one of them up to a spec-an and set it to TX a tone that I could move
around from GNU Radio. What I found was that below ~1.2 GHz I get images
of the tone all through the radio's bandwidth. Above 1.2 GHz and things
look as expected (just the one tone). I was also noticing that the 90-100
MHz range (FM radio here in the US) was getting overlapped with what
appeared to be TV or cell signals. Those should in no way be in the 100
MHz region where I am. Tuning the radio around showed that I was seeing
loads of signals from much higher frequencies aliasing in. So, for fun I
attached a 100 MHz low pass I got from an Analog Devices class, and that
knocked out the images I was seeing in the FM band. But, now moving down
to ~ 50 MHz I was seeing images of the FM radio band. My assumption here
is that the filters on the daughterboards are hosed. Perhaps somebody fed
in a really strong signal and destroyed them? Are there two sets of
filters on the WBX? One for below 1.2 GHz and one for above? That would
help explain why my TX tests work > 1.2 GHz. Would the 100 MHz low pass
filter test prove that the mainboard isn't the issue? My fear previously
was that the ADC's and/or DAC's were broken. Not sure if that's still a
possibility. If it is, can you suggest tests I could run using a spec-an
and attenuators/terminators?
Thanks for the help!
-Dave
On Mon, Aug 15, 2022 at 10:53 AM Dave NotTelling <dmp250...@gmail.com>
wrote:
> Marcus,
>
> Thanks for the link! I didn't have any terminators on hand over the
> weekend, but will try that today. Appreciate the suggestion!
>
> -Dave
>
> On Mon, Aug 15, 2022 at 10:51 AM Marcus D. Leech <patchvonbr...@gmail.com>
> wrote:
>
>> On 2022-08-15 10:47, Dave NotTelling wrote:
>>
>> Marcus,
>>
>> It was crazy cheap (~$650), and reflashing on power up isn't hard
>> :) It's a fun toy for learning about RFNoC and just FPGA fun in general.
>> Came with two 40 MHz WBX boards. Is there a part number for the flash? Is
>> it something that can be popped off with a hot air gun? I think it did
>> come up on its own once. Curious if it just needs to be reflowed.
>>
>> The schematics are here:
>>
>> https://files.ettus.com/schematics/x300/
>>
>>
>>
>> It does seem to have a working EEPROM since I can change the IP
>> address.
>>
>> I also noticed that both WBX boards have nasty spur looking tones
>> for several hundred MHz in the lower range of the WBX. Is it possible that
>> there are issues on the motherboard that could cause those issues? I have
>> a proper power supply arriving today to replace the ATX computer supply I
>> have been testing with (12 Volt)
>>
>> Could very well be clock issues or other things in the standard
>> daughtercard interface that are unexpectedly noisy.
>>
>> Do they go away if you terminate the inputs?
>>
>>
>>
>> Thanks!
>>
>> -Dave
>>
>> On Mon, Aug 15, 2022 at 10:41 AM Marcus D. Leech <patchvonbr...@gmail.com>
>> wrote:
>>
>>> On 2022-08-15 10:34, Dave NotTelling wrote:
>>> > Apologies if this is a repost. I don't think my original message made
>>> > it to the list for some reason.
>>> >
>>> > I recently got my hands on a used x310. It seems to work well, but
>>> > for some reason will not boot on its own. Vivado hardware manager
>>> > shows the device as not being programmed, and the network interfaces
>>> > don't come up (no lights on the SFPs). If I reflash the device with
>>> > Vivado it will come up and work as expected. Is there a way to test
>>> > the flash chip to see if it's alive? Running uhd_image_loader seems
>>> > to work fine, but the device still will not come up automatically.
>>> >
>>> > Thanks!
>>> >
>>> > -Dave
>>> >
>>> >
>>> This does sound like a FLASH issue. I hope you didn't pay that much for
>>> it...
>>>
>>>
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>>>
>>
>>
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