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G8JNJ

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G8JNJ
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  • A bit of feedback on the forced username option to start the KiWi session. I've found that some folks are just filling up the entry box with junk (or worse), so I've turned it off. Most sensible users seem to ID themselves voluntarily, and those tha…
  • Yes, the PSU ramp up / settling time can be an issue, as others have found. I have built several linear supplies and the KiWi's always seem to start up OK, despite having a somewhat slow rise time. I just wanted to mention the output voltage settin…
  • Hi John, Before the update that included the antenna switch in the RF control panel, in the original configuration I had set no mixing allowed. When the update was performed, it seemed to default to mixing allowed. In the admin extension panel, I se…
  • I run my V1 at 5.4v output under load. This compensates for the cable, connector, and PCB resistive losses. There is 5v when measured at the Beagle header, and it starts on the application of mains to the linear PSU. I'd set the PSU volts to give …
  • To make a comparison such as this, the frequency, mode, receive bandwidth and RF parameters need to be set exactly the same as each other, including the waterfall and S-Meter calibration values. Don't use the S-Mater value, the scaling is too coarse…
  • The attenuator should reduce any off-air signals by the amount of attenuation shown on the slider control. If setting it to -30dB, only results in a slight drop in signal level, from S7 to S6 (which equates to 6dB) then it looks like the attenuator …
    in Dead Kiwi 2 ? Comment by G8JNJ April 13
  • That doesn't look good, unless I misunderstood your comment. If the internal signal generator seems to produce a signal of around the correct level, I suspect the RF input connector, attenuator or RF amplifier stage has somehow got damaged. What hap…
    in Dead Kiwi 2 ? Comment by G8JNJ April 12
  • Some other options here https://www.fenu-radio.ch/en-index1.htm Personally, as guidance, I wouldn't pay more than approx £100 GBP / 120 Euro or US Dollar for a commercial loop. Beware of Chinese made loops, they are of questionable quality and the…
  • LKZ1AQ or Cross Country Wireless. https://active-antenna.eu/ https://www.crosscountrywireless.net/ But before you buy anything, have a look at the loop antennas IO group. https://groups.io/g/loopantennas Several KiWi owners on there, and loop P…
  • Just a thought, I know it's only semantics, but maybe to alleviate the issue mentioned. Perhaps reword the "Antenna switch is not configured." to "Antenna switch not in use" to shift the emphasis from admin function, to user inf…
  • I have noticed on two separate KiWi's, that with the antenna switch in the control panel, antenna mixing is allowed, until you go into the admin GUI, select the antenna switch extension then turn the mixing off, on and off again, then it performs as…
  • Am I missing something ? What is the problem with using an image with version 1.665, and then using the update procedure to version 1.666 ? Regards, Martin
  • Go to the admin GUI select the update page. Check for software update and select "check now". If an update is available Force software build and select "build now" The build will commence and the KiWi will reboot after approx 2…
  • You can set the calibration in the admin / config GUI. Ideally you should use an external calibrated signal generator, but I have found that :- S-meter calibration (dB) -13 Waterfall calibration (dB) -10 This is a good starting point, and p…
  • My KiWi 2 is the same as the KiWi 1. I have them fed from the same splitter and the performance is identical. http://wessex.zapto.org:8073 KiWi 1 http://wessex.zapto.org:8074 KiWi 2 You may need to check that they have the same S-meter and waterfa…
  • I wouldn't trust a Chinese made torque wrench. https://owenduffy.net/blog/?p=18806 It's unlikely that the KiWi will be repeatedly connected and disconnected as much as some other equipment. Slightly past hand tight is fine, and don't use a big adjus…
  • Hi John, Good job you included a CAT control interface to the KiWi :-) Regards, Martin
  • I also use an iPad and select the browser 'mobile' option, and for most things on the KiWi this works really well. A 'two finger tap' will also bring up many of the options that are not otherwise assessable. But I also wish Apple would stop adding '…
  • Yes, a good introduction. I just wish he had also demonstrated the TDoA function, which as far as I'm aware is not possible with anything else at hobby level. Maybe there will be a part 2. Regards, Martin
  • OK, Does the KiWi V2 board work when plugged into the Beagle board of a working V1 ? Regards, Martin
    in Dead Kiwi 2 ? Comment by G8JNJ April 7
  • Personally I'm not that fussed, but Geolocation generally seems to work OK for me, and is usually pretty good with UK based users, other countries perhaps less so. I can usually 'spot' my regular users from their location information, even if they a…
  • The signal generator is one of the KiWi extensions. It generates an internal test signal, so it doesn't validate everything, but at least it will tell you if the software is working correctly. The easiest way to reflash your KiWi, would be to make a…
    in Dead Kiwi 2 ? Comment by G8JNJ April 6
  • It's not clear to me if you have you got one good working KiWi, and if that KiWi is made up of a collection of parts from the KiWi 1 & 2. It seems to me like there are a number of problems here, and each one needs to be individually identified. …
    in Dead Kiwi 2 ? Comment by G8JNJ April 5
  • Watch out if you are suing brushless fans connected to the DC supply feeding the KiWi. I have just built some linear supplies and found a couple of things. There was significant RF noise from the DC regulator (yes really) at frequencies below 1MHz. …
  • Hi Bob, Shop around for a Sunon Maglev, a bit more expensive, but they tend to last. https://forum.kiwisdr.com/index.php?p=/discussion/2559/fan-quit/p1 Note that all of these brushless fans tend to generate a bit of electrical noise, produced by t…
  • Wow, what sort of power level must have been present at the KiWi input to do that ? Even with relatively close spaced antennas, the coupling between them isn't usually that great. Most receivers will withstand RF levels up to about +10dBm, and I wou…
  • Also, how many users are connected to each ? The waterfall will slow down when there are multiple users. Regards, Martin
  • You are lucky as you have other working KiWi's available to you. Back up the faulty KiWi so you can revert to the image if required. Then make a backup card from one of the working KiWi's and load that image into the faulty one. If the fault is sti…
    in Kiwi 2403 Comment by G8JNJ March 25
  • Beware of UPS's, some are VERY noisy. If you want to provide support if the mains fails, consider using a battery bank and powering the equipment directly. Regards, Martin
  • Hi Christoph, That is a brilliant bit of work, and I think Peter, G3PLX, would be interested too. Now to how to combine that with the TDoA function :-) I'm located about 15km away from the Wessex site, and I could maybe generate some low power sweep…