jks
About
- Username
- jks
- Joined
- Visits
- 36,332
- Last Active
- Roles
- Member, Administrator, Moderator
- Points
- 642
Reactions
Comments
-
Was it only the ADC chip and nothing else? Not the ADC preamp (inside the RF shield) or any other other smaller parts? Does the GPS work? Great job getting it fixed!
-
There are a couple of issues to consider in making your Kiwi publicly available. The website documentation discusses all this. First, you need to know if your ISP blocks incoming connection setup. This is generally true for residential ISPs, but it …
-
Is the Kiwi connected on the same local network as the computer/device you're running the browser on? For example, if the Kiwi is on Ethernet and your laptop is on WiFi do they both use the same 192.168.1.* subnet? Do you know the IP address of the …
-
The Kiwi antenna port is AC coupled. And the caps (see schematic, C405,406) are rated for 100V. I can't imagine there was a DC path unless the TVS diode(s) shorted. But even then that would just put a short across the antenna port. Even if it was wi…
-
TWR kindly setup a Kiwi in Dehli in 3-channel, 20.25 kHz mode. But here's the deal. Even 20 kHz is not enough for the 18 kHz mode DRM signal. How can that be? After going to the DRM spec (page 119) I realized that in mode A an 18 kHz DRM signal is a…
-
We've had several cases of reverse polarity causing the power management IC on the Beagle to blow up. But the damage is stopped before it propagated back to the Kiwi board. So personally I'd spend the money on another Beagle. And if you had a BBAI p…
-
That was a quick hack I added at Martin's request. It's the HF value computed by the periodic SNR measurement routine. If measurements are not enabled then no value is shown. The value also appears in the mouse-over popup for each sampling station. …
-
It is worth following the BeagleV forum where you can see all the problems encountered by other people: https://forum.beagleboard.org/c/beaglev/15 It's a good way to judge the state of the platform.
-
I found some documentation here: https://docs.beagleboard.org/latest/boards/beaglev/ahead/index.html But what's also needed is the processor chip manual. That will have the SPI interface specs. Although I suppose you could just buy one and try/measu…
-
Okay, very glad to hear you're running again. We have a number of cases now where the Beagle has served as a moderately expensive "fuse" that ends up saving the Kiwi board when there is some upset (lightning-induced surge, static discharge…
-
I looked at this briefly. I was surprised at how expensive it is: US$150. Processors from China don't always have the best documentation, generally speaking. It is critical to know up front how fast the SPI interface is and know that it can work at …
-
Just getting to this now. Yes, adding --snd is what you want. The file will be real (1-ch mono) or IQ (2-ch stereo) depending on the -m <mode> setting. Modes iq drm sas or qam will result in a 2-ch stereo file. Remember that the mode is reflec…
-
(ahem) ... 0-60MHz Any port in a storm! lol. Beautiful image.
-
I'll get to this when I can. Things are stupidly busy right now..
-
Sounds to me like someone, who should have known better, got caught with their pants down, and is looking for a scapegoat. Moral: Don't commit Error 33 (ask me how I know, lol).
-
A "semi-high" reading with a DVM can be an indication that the pin is switching (the DVM gives a somewhat averaged DC reading). Your scope, even though limited in bandwidth, should show the switching. Bit 13 and OVFL always being high seem…
-
No, the backup script does everything. Including formatting. But the error you're getting means that the sd card is not seen by Linux at all. Try re-inserting the card. Or a different card. Has this "adapter" ever worked successfully befor…
-
The v1.621 release going out today will have 20.25k DRM support. I'm going to ask TWR if the guys that run the India Kiwis could change one of them to 20.25k mode for a few days so we could test using real 18/20 kHz DRM signals.
-
So I have this working now. But it's kind of moot if we can't get some of the TWR Kiwis to change to 3-channel 20.25 kHz mode. Unless someone knows of 18/20 kHz mode DRM transmissions outside of India AM BCB.
-
Looks like it is. But I'd probably have to spend another day figuring how to get it connected up in a compatible way.
-
I don't know if sox is available as an arm library that could be linked in with the Kiwi application. That's what I would need.
-
I worked on this all day yesterday but couldn't get it to work. I'm not sure why. I resampled the DRM extension "test" files to 20.25k and removed the restrictions that prevents operation in 3-channel, 20.25 kHz mode. As far as I could tel…
-
Not three years. But it hardly matters. What do you mean "quit working"? Are you sure it's not just a software issue? If hardware, could it just be a damaged Beagle and not the Kiwi board itself? (see the recent thread "troubleshootin…
-
So I need a recording to check if a BBAI or BBAI-64 is capable of handling a DRM 18/20 kHz channel signal on a Kiwi configured in 3-channel 20.25 kHz mode. Unfortunately all the TWR Kiwis in India are configured for 8-channel 12 kHz mode. So if anyo…
-
I assume you mean for the use of DRM in India on the AM BCB. I went back over my notes. But I couldn't remember exactly why DRM doesn't work in Kiwi 20.25 kHz mode currently. It's possible there's just not enough Beagle processing power to do it.
-
I'm not familiar with lsusb. Does the ADU218 create a serial device entry in /dev when it's plugged in? Something like /dev/ttyUSB0?
-
Do those devices, when plugged in, cause a USB serial device to appear on Linux/Debian? If so then it should be pretty straightforward to adapt one of the existing backend shell scripts to open and send commands down the USB serial.
-
My only other suggestion is to check all the other voltage test points (see the troubleshooting guide). "1V" and "1.8V" for the FPGA. "3.3A" for the RF. "3.3G" for the GPS. Also, check that you have a GPS cloc…
-
Well that doesn't quite make sense. Look at the schematic (http://kiwisdr.com/docs/KiwiSDR/kiwi.schematic.pdf) The oscillator and external clock both go through U406 on the way to the FPGA. If the FPGA sig gen worked when you applied an external clo…
-
Yes. That's a very good idea and has not gone unnoticed..