G8JNJ
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Hi John, Sorry to add to your pain, and this really isn't urgent, but it may give a clue regarding side effects of the latest updates. I noticed that when listening to AM broadcast stations that carry phase modulated data, such as the now defunct Fr…
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Hi John, Maybe check with my co-sited KiWi V1&2 that the timestamps correspond too, as the GPS chips are different. Regards, Martin
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Agreed something is not right. All of mine have updated OK, still with 12 GPS channels and the same level of noise floor. Regards, Martin
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Hi John, Nothing is urgent, so please get some rest. Thanks for your continued hard work and this latest fix, which seems to have resolved a long-standing problem. Regards, Martin
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I tried doing several TDoA's today on different KiWi's, but I keep on getting an Octave:index-out-of-bounds error. Not sure if this is related to the updates or some other problem. Anyone else seeing this ? Regards, Martin
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I'd agree the new filtering has improved the general performance, but I think it has also messed up some other unintended functions, SNR reporting and maybe TDoA too, but I haven't been able to confirm the latter.
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Unfortunately the same here.
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Hi Bob, Just a random thought... If you have room for more antennas, is there a reason you have chosen to use the broadband active loop ? Would a wire, passive antenna be an option ? Regards, Martin
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Hi Bob, What antenna are you using at the moment ? There are quite noticeable intermodulation products from Medium Wave broadcast stations. I don't think it is occurring in the KiWi itself, but the antenna feeding it. Have you got any filters in l…
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As a follow-up to the subject or Amplitude / Frequency equalisers. After a bit more research, I came across this document published in 1977, relating to the use of an Amplitude / Frequency equaliser at HF listening stations operated by GCHQ. One of …
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OK, ignore my last comment, I just tried it, and it did switch between them. 8073 & 8074 seem to come up with the stored database in all the browsers I've just tried. Maybe it's still a local browser caching issue ? I've seen this happen more o…
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Can you switch between databases in the user web GUI ? (shift & pipe) ?
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Hi Bob, Some splitters still work well below their defined lower frequency limit, a lot depends upon their construction. The loss increases and the port isolation degrades, but they are very often still usable. If you have a KiWi error like that, th…
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Yes, the two, three and four port versions are all useful. You can often obtain the 75 ohm versions a lot cheaper on auction sites, and they are still good. https://www.minicircuits.com/WebStore/dashboard.html?model=ZSC-2-2-75%2B https://www.minicir…
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Hi Bob, If you have your S-meter and waterfall calibration offset o a value of -13dB, then you shouldn't have any overload problems as long as all the signals in the spectrum display are under -30dB. I think you can safely decrease the amount of att…
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Hi Bob, This is still odd. Get rid of those 4-5" pigtails if you can, as they will definitely be picking up noise. The overload problem is something different, but it's difficult to tell from the previous screen grabs. Is it not affecting your …
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That doesn't look good. The S-Meter calibrate offset value should typically be around -13dB, rather than 0dB to provide a more accurate S-Meter reading, and a near calibrated dBm digital readout. However, that doesn't account for the residual high l…
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The 6MHz frequencies in that vicinity are a global ISM (Industrial, Scientific and Medical) allocation and are popular with folks operating low power unlicensed personal beacons. So it could be that someone is trying to listen for one of those, but …
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Hmmm, >When I relocated the receivers, the coaxial connectors were torn from the boards and the screw terminals are now being used. I wonder if there has been other physical damage ? It seems to me that the input coupling capacitors have somehow …
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As Vojtech, OK1IAK, has already commented, the power supply itself is only part of the equation. Filtering the DC output to provide additional common mode isolation from signals on the AC side of the PSU also seems to be an important factor. The 'l…
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Muan #12 was marked as unknown in some previous tables Towers located at 35.0330815,126.2392675 35.0336783,126.2376957 NZ to NEW ZEALAND #5 Lat/Long changes to #15 Additional frequencies to #15 Frequency changes to #15 Ground stations UNKNOWN #0 S…
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My audio mute suggestion was to be used in conjunction with external RF switching, so that you don't get audio feedback when transmitting. It will save you having to switch or mute the speaker with some other type of control signal. I should have m…
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An audio mute can be achieved by adjusting the slider control in the admin / config page "Passband overload mute 0 dBm (S9+73) When the signal level in the passband exceeds this level the audio will be muted. The icon will replace the mute …
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I use Paypal a lot, but cards are fine too. I don't use Google and Apple Pay for various reasons. Regards, Martin
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Hi Jos, I think it's mainly down to the additional amount of space it would take up in the control panel. Personally, I don't understand folk's obsession with S-Meters. There is also the issue of to what standard they are calibrated (or most usually…
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I agree, allowing the KiWi V2 attenuator to provide automatic broadband attenuation when required is a desirable enhancement. I just wish many of the KiWi's had a decent enough antenna to make it occasionally operate. Regards, Martin
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@sm7yes We are agreeing with each other, I was just trying to emphasise the point. At Weston, we actually have a fairly sophisticated MQTT controlled external automatic attenuation and notch filter system. https://forum.kiwisdr.com/uploads/172/TM30…
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The key aspect is Signal to Noise Ratio (SNR). If you have >10dB noise floor above the receiver noise floor with the antenna connected, you are throwing away Dynamic Range. The ITU noise curves are in the region of 20 to 30dB higher at 1MHz than …
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Yes, it was discussed in this previous thread, along with some other relevant information further along. https://forum.kiwisdr.com/index.php?p=/discussion/comment/16636 My feeling remains that in most cases, a simple passive amplitude / frequency …
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Speak with your ISP to determine what their policy is. This is a common problem faced by folks with home security systems, so they will most probably have some form of workaround. However, it may involve paying an extra fee to provide a 'business' c…