G8JNJ
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"This report is so vague I don't know where to begin. "Find some directories"? What does that mean exactly?" Hi John, Yes it is vague - sorry about that. I tired to get a grab of the terminal screen and log whilst running some…
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Hi John, I think there is a problem with v1.248 I updated my main KiWi earlier today and it ran OK. But now several hours later I can't log into the web interface either as a user or admin. I have a 30 min inactivity and 120 min IP timeout set. …
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Hi Ron, I agree with Clint. The screen can sometimes be a curse as it introduces low frequency ground loops that may negate the balanced lines. You need to use type 77 or 75 in order to be effective at the lower frequency end of the spectrum, alth…
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That made a big difference to the positional plots on the GPS map in the admin screen. It also stopped my height ASL jumping around and it's now very stable. Unfortunately it doesn't seem to have made as much difference as i would have expected to …
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Interestingly I found that using screened CAT 5 cable actually made the noise levels on the VLF bands <50KHz much worse. In the end I went back to using un-screened CAT 5 with 12 turns through a FT240-31 core (Mouser part number 623-2631803802) …
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http://forum.kiwisdr.com/discussion/1353/v1-239-shortcut-keys-x-y-for-ui-visibility-control#latest
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Would it be possible to 'buffer' the USB port with something like a rechargeable power bank ? PC to charge port on power bank and 5v output to KiWi ? When I checked one of mine the other day with a cheap DVM, it was drawing about 600mA, but it cou…
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Hi Terry, I should have made this point in the posting. The connector is simply to bring out the GPIO pins. Some sort of interface circuit is still required to drive any external relays etc. I use transistor drivers with about 100K from the GPIO…
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Hi David, I assume you are referring to the KiWi SDR (your question has been posted in the LOGI General Discussion forum) ? [I moved it to the KiwiSDR discussion category -jks] The KiWi SDR can run in 4ch or 8ch mode. When used in 4ch mode you …
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This morning I checked the other Beagle that I had repaired as it previously had a blown PHY chip. Guess what...... R136 has gone open circuit on this board too. So the digital ground and ESD ground are no longer connected. R136 had the correct …
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Hi Clint, Agreed, it's probably not best practice and it's sensible to include some resistors and filter caps. In my case the switching unit is mounted adjacent to the KiWi and is connected by a short length of screened cable, so I'm prepared to r…
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@ UR5VIB That's a good catch, I spent quite a lot of time last year looking with Google Earth around the edge of the Caspean Sea trying to find that site. Well spotted :-) Regards, Martin - G8JNJ
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Hi John, Measuring 'it' was what caused me the initial concern. I disconnected everything from the KiWi and measured between the outer metal body of the RJ45 and the screen of the RF connectors, I saw 3.5K Ohm. This seemed to correspond with the…
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Hi Mauritz, You make valid points. I've been trying to figure out the exact circuit, but this is the best I've managed so far. (Image) I've also included three of the possible external ground paths, which may, or may not, be at the same potenti…
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Hi John, > >I first read this as implying there was no connection between the antenna ground (SMA outer threads or green header block GND terminal) >and the Kiwi, Beagle or enclosure grounds. Just to be clear, that notion is false. > …
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Just re-reading this message. It's also worth noting that the SEEED metal case does not have a direct connection between the antenna ground, or any ground, that may or may not, be provided by the DC input cable. So the metal case is effectively '…
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> >It would seem to be a good practice to have all grounds at the same potential or as close to it as practical. > Hi Ron, That's my thinking too. I'm sure the Beagle Bone designers has their reasons, but when used in conjunction with th…
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Here's a photo of the various ground connections on the Beagle board. (Image) R136 is the 0.1 Ohm resistor that provides the Ethernet ESD protection, which had gone open circuit on my board. I changed R136 for a Zero Ohm resistor and added an ad…
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Hi, Just installed it and tried it but it doesn't work with the KiWi. I tried playing some videos on YouTube and it worked OK with that. So it can work but sadly not for the KiWi. Which is a pity as it would have been useful to open up receivers …
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Plenty of various sweeps in that part of the spectrum on this extreme eastern Russian one http://khabsdr.proxy.kiwisdr.com:8073/?f=5240.00iqz7&pbw=10000 I'm not sure I'd be able to pick the correct one out from among that lot. Regards, Martin…
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Hi Peter, So far I haven't been able to find any KiWi's with a good enough signal on 5240 & 5350. The one in Germany is difficult enough even with a good number of KiWi's dotted around the area. If you want to try for the one in Germany, you …
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Whilst messing about with my Broken Beagles I noticed that the DC volts at the power supply had to be at around 5.4V to provide 5v at the Beagle. On first inspection this seems to be associated with the RF filter on the DC input of the KiWi board, …
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I replaced the LAN8710A (PHY) chips on the two original Beagle boards and they now work correctly. I had a bit of a problem with the second board as the LAN8710A is a 32-pin QFN/SQFN surface mount package with a fairly large heatsink pad on the un…
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I got my KiWi's back up and running today by replacing the BBG's with new ones from Farnell. The first one fired up perfectly after I had loaded one of my backup images of a recent version from the SD card. The second one loaded up with a backup i…
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I've also had this problem and wondered about building a simple power up 'pulse' circuit to strap across the KiWi reset button. We had a similar issue where I used to work, with a product in a test rig that required a quick button press to turn it …
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Hi Stu, I agree you have to be careful with ESD paths, especially if you have big external antennas and live on top of a hill :-) The first KiWi was obviously connected to the antenna etc. when it failed. However the second one only had the ethern…
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Hi Ron, Swapping cables and such like was the first thing I tried. Unfortunately it looks like the LAN8710A chips on both Beagle boards are fried. I'm not sure what has happened. The first board was definitely not my doing, but the second could h…
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OK the BBB is only slightly more expensive and isn't produced by Seeed so it shouldn't suffer the same problem. Is it physically compatible to replace the BBG Will it fit the metal case and are the GPIO pins the same etc so that the antenna switch …
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The PHY chips are only warm. A bit of internet surfing suggests that the BBB is even worse with regard to the ethernet port not initialising. There seem to be various hardware mods suggested to strap a pin to a GPIO port so that it can be kicked …
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Yeh, I'm really sorry to be the bearer of bad news to you John. Jul 23 14:26:31 kiwisdr kernel: [ 149.672992] net eth0: initializing cpsw versi on 1.12 (0) Jul 23 14:26:31 kiwisdr kernel: [ 149.680956] net eth0: ph…