G8JNJ
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> >so didn't even consider the Kiwi console which is, of course, most accessible > However it only works if you have local access to the KiWi, otherwise you will need to ssh in. Regards, Martin - G8JNJ
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Hi Glen, I was able to enter these commands directly via the KiWi admin console page. I don't know if this is possible, but the responses I got back seem to indicate that it worked OK. Regards, Martin - G8JNJ
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> >Rob, AI6VN has had good success in mitigating these, without additional enclosure shielding, through use of a USB/WiFi dongle which >bypasses the wired LAN connection and attendant spurious energy. > Hi Glen, I 100% agree, I think g…
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> >I assume the brass screen could be mounted on the outside and have the same effect. > There is a problem in that the brass mesh has to have a good electrical connection to the end plates and the rest of the case. This is achieved by san…
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> > are the PSU linear? > No, they are heavily modified switched mode units and are electrically / RF quiet. I selected the most quiet units from my pile of switchers, and then added extra filter components and screening foil inside the pl…
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Hi All, I've had some issues with radiated noise from a KiWi that I installed on a shared site. The main issues were that it was interfering with of VHF satellite reception and degrading the GPS performance of another system in the same room. The …
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Thinking about this still further, I can't imagine any good purpose behind what's going on. Maybe it would be a good idea for all KiWi's to have the IP address blocked, at least until it's better understood what's going on, by which time it may be …
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Looks like they have started on mine too, so I've blocked them at the router. Maybe the KiWi needs additional mechanisms to automatically defend against such incursions, or at least flag them up ? Regards, Martin - G8JNJ
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The Bonito MegaLoop FX Active Loop has a very impressive specification in terms of IMD performance, with a stated IP3 value of typ. +40 dB and a IP 2 value of +85 dBm for something that only draws 40mA at 5v. I've built quite a lot of loop amplifier…
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Maybe you would have to mark collected data as errored for a time period either side of a 0V event occurring ? Regards, Martin - G8JNJ
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Thanks John, That worked, and having thought about it, it should have been pretty obvious to me too. Regards, Martin - G8JNJ
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I'd also check your power supply. I've had similar symptoms in the past, and it was associated with the power supply voltage being a bit too low. Sometimes it all worked OK and other times it didn't. In fact 90% of any issues I have ever had wi…
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Hi Jim, The figures were estimates for guidance purposes when planning a distribution system, but realistically a 75 to 50 Ohm 1.5:1 SWR mismatch is not going to cause any major problems. Any additional mismatch loss will be minimal (typically les…
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Some further notes for anyone who may pick up this thread at a later date and wish to copy this information. If you wish to split the GPS signal from the antenna to feed multiple KiWI's. Do not attempt to simply use a tee adaptor or similar to spl…
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Hi Chris, I use passive satellite TV splitters with an inbuilt DC block (or steering diodes) on all but one port. This sort of thing with suitable adaptors. (Image) I use a two way to feed two more two ways, so that I can feed the office and wo…
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Hi John, Thanks for the reply. I really appreciate the effort you have put into this project, and I greatly appreciate you graciously covering the additional costs. I understand your reasoning, but just wanted to raise the issue, as it seemed lik…
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Thanks Powernumpty. I'd looked for the edit cog just after posting, but couldn't find it. Turns out you have to move your mouse over the message text box before it appears.
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This afternoon I played with various 4 way splitter designs. Note that all 4 way splitters have a minimum of 6dB through loss, regardless of whatever is connected, so you should only use them after a suitable amplifier with about 10-12dB gain. All…
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Hi, You could try building these designs http://f6aoj.ao-journal.com/crbst_136.html BN73-202 with four turns on the second transformer rather than two (to improve the LF performance), the -1dB points are at 20KHz and 70MHz. or http://www.dxing.…
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> >John, is it possible to have the basic (landmass boundaries) maps that TDoA used when I first got my Kiwi last summer? >Presumably the multiple TDoAs I do when I TDoA in order to see the results "group" requires the same map ti…
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> >We have decided to purchase a commercial subscription, at considerable cost, from the map provider in the interest of expediency. Like >the costs to run the proxy service it will be absorbed by KiwiSDR and not passed along to the custome…
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Unfortunately with reversion back to Google maps, it's not possible to select an individual SDR if there are multiples contained within a 'Bullseye' marker, even if you zoom right in. Regards, Martin - G8JNJ
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You can usually buy directly from Mini-Circuits - but they often have a minimum order quantity and you have to wait several weeks for delivery. Personally I'd keep an eye on Ebay, as there are always lots of splitters up for sale. Note that the 75…
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Hi Chris, I measured the current draw of my KiWi supplied GPS puck. A bit lower than I expected. 8.45mA @ 3.3V and 8.9mA @ 5V Regards, Martin - G8JNJ
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Hi Chris, Can you check what current the GPS patch antenna is drawing - even if you just power it from a bench supply ? I'd expect something in the region of 20 - 50mA. But I can confirm once I've measured mine. Regards, Martin - G8JNJ
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On a similar subject. When the cursor is moved over the Spectrum display it shows a level marker - would it be possible to also add the marker frequency in the 'balloon' under the level reading ? Regards, Martin - G8JNJ
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Hi John, OK that's a pain. Thanks for the quick fallback though. Regards, Martin - G8JNJ
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I notice that I have a bit of interference in the middle of the DRM signal on my SDR, but one of my mates has a better signal on his KiWi http://sdr.loginto.me:8074/?f=3964.90iqz12 Regards, Martin - G8JNJ
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Dream decoding is tricky, once you have found a station you have to fiddle with the audio level, exact frequency (look for the frequency error in Dream), SDR agc settings and RX bandwidth to get the best and most consistent audio with the least drop…
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Hi Glenn, Thanks for taking the time to do this for me. I'll work my way thorough it and try and get it running. Regards, Martin - G8JNJ