KA7U
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- KA7U
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Comments
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Earl, Same thing here. Using Chrome Version 71.0.3578.80 (Official Build) (64-bit) Ron - KA7U
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Ben, here is a screen grab of my KiwiSDR time report: (Image) Is this one different from yours in respect to UTC and Local Time? I mean what is happening with your time display? Will you post a screen grab of it? Ron - KA7U
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The worst spurs are still visible although about 20 to 30dBm down from before. So I think the spurs are actually received by the antenna and not a common mode problem that can be cured by shielding and cores, necessarily. Shielding and cores did mak…
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My cat got obsessed with chewing up the 4 pair FTP cable feeding my loop antenna @ ka7u.no-ip.org:8074 and it has been raining here, soaking the cable through the punctures, so the signals degraded and the noise increased. So of course I decided to …
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Martin, It would seem to be a good practice to have all grounds at the same potential or as close to it as practical. The ESD ground to Ethernet Screen connection should be close to 0 ohms, I should think. I do not know why having the digital ground…
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I think the Pixel Loop uses the amplifier described below. If it does, I don't see provision to filter frequencies above 30MHz. I see the OV light on the receiver but there isn't a signal appearing on the waterfall to explain it. So I suspect the st…
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Glen, so the power goes off. The capacitor discharges to the KiwiSDR. The power comes on, the capacitor charges, the KiwiSDR fails. Repeat and it will fail again. If the power supply comes on, then a switch connects the 5vdc to the KiwiSDR it should…
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My power supplies, 5vdc 2.5 amp analog supplies, fail to start the KiwiSDR from a power up. I find it necessary to pull the power plug from the KiwiSDR and plug it back in. Then the KiwiSDR will start. I speculate that the power supply does not come…
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Martin, If you haven't already, try a new network cable. I've had good network cables quit or become intermittent. Sometimes an unplug/replug gets it going, or changing the cable to another known good one. The pins on the plugs seem to corrode a bit…
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Martin, After you connect to the KiwiSDR with the USB cable, enter the command ifconfig . That will list your network connections and assigned IP addresses for each one. You are looking for eth0. You can also reboot the KiwiSDR and then enter this …
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A report on the ongoing experimenting with the home brew ZL1AQ loop amplifier and the commercial version. I have now made a total of 6 LZ1AQ amplifiers, 3 using matched 2N2222 transistors and 3 using 2N5109 transistors. I've experimented with single…
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Martin, K7RHB asked me to consider RF over Fiber as an antenna to receiver line. We talked it over and thought it might be worth investigating and if feasible, testing it out to see if any improvement over coax and twisted pair could be realized. K…
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According to what I read the LED transmitters are limited to about 10MHz for the blue lights and maybe 5MHz for the Red, so a laser system is needed to directly modulate radio frequency. I think the problem with the transmitter/receiver pair in my l…
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Dave, I think you have the most efficient way of routing the audio to the decoder software, using a Windows PC. If you chose to use Pulse Audio it would give you somewhat different setup options, but the results would be the same. Ron
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Dave, The program suite is called Kiwiclient. https://github.com/jks-prv/kiwiclient/tree/jks-v0.1 I use it to record when I'm not there, or to obtain an audio file for further uses. I was interested in DRM and would not stay up late or get up early…
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OK, it is working reasonably well, quite well actually. Something definitely improved. I find it interesting that the decoder usually works ahead of the audio, so I'm reading it before I hear it. That is neat because it makes it easier to verify the…
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It really doesn't work well for me. I gave it a pretty good test tonight. Mostly S-7 to S-9 signals, some hand sent and some machine sent. Decodes about 10% of the time. I refreshed and tried different browsers and stuff, but don't find it useful. I…
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CW decoders only seem to work on perfectly sent CW. Still it could be useful for some... Ron - KA7U
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So you guys are imagining an extension for the KiwiSDR to plot propagation maps based on the chirp from 2 or more Ionosonde transmitters located at various sites around the world. Then given the site of interest is near the target receiver you want …
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The MUF of the minute is quite a moving target. Real time compilation and computation of the data will require resources! The methods I'm familiar with, while using averaging and interpolation, have proven remarkably accurate for use in the Amateur…
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Depending on your use, I think this is a low cost and low effort solution to the MUF. http://www.dxatlas.com/IonoProbe/ http://www.dxatlas.com/HamCap/ This software works well. Ron - KA7U
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Now this is a very nice receiver! very low noise and great sensitivity from VLF up to as far as signals were available when I tried. it. Tell us about your shielded magnetic loop please! Ron - KA7U
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How are you able to discern 1 or 2 Hz? (Image) Ron - KA7U
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I'm always mistyping LZ as ZL... I'd edit the post if I could [fixed -jks]. I'm currently running the home made version of the LZ1AQ until I get around to attenuating 1260 and 1380 KHz. A friend is bringing a bunch of tuning coils, 2-18 uH on Wedne…
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@G8JNJ Martin, I used a transmitter set for 5 watts into a 50 ohm load. First testing the Hiletgo amp for received signal and then placing the LZ1AQ in the same location and direction and checking again. It should provide a relative indicator of th…
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@G8JNJ Martin, I tested the LZ1AQ amp here today and compared the tests with the Hiletgo amp test results. Don't know why I didn't do this sooner but anyway: Hiletgo LZ1AQ 28.5MHz -69dBm -43dBm 24.9MHz …
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0348UTC and the noise on 11331 is not serious. Makes me wonder if it is the power line or some other noise source. At my location, all can be quiet and then boom, the noise floor goes through the roof. I've tracked it to a grain elevator motor acros…
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I don't think -40 signals should cause an OV on the KiwiSDR. In my experience, once the signal is reduced to below -30dBm the KiwiSDR doesn't go into OV. If there is a signal approaching -20dBm or better anywhere between 0-30 MHz it will cause an OV…
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Suppose you want to notch 800KHz >10dBm. You could place a series LC circuit consisting of a 68pF capacitor and a 575uH inductor from the signal input lead to ground. A calculator to help with this determination is here: http://www.deephaven.co.u…
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As far as I know, the SSL system relies on the certificate of authenticity residing on the server. Each KiwiSDR is a server... I setup SSL on an Apache Server and it was not difficult but to get one that didn't argue with the client about authentici…