Comments
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Hello, I forgot to mention that I'm using a linear 5V power supply for both the kiwi and the antenna. Thanks for the response @jks. Based on your response, I added the following experiments: Disconnected the antenna power supply: (Image) I can s…
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Hello, thanks @G8JNJ , I will try the resistor approach. @n6gn yes, Uruguay is 50hz. I already tried to replace the power supply with a 9V battery, and the harmonics are still there. If I unplug the antenna, they disappear. I suspect they enter thr…
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Hello. Don't worry. Right now I'm using a linear 5v power supply. Regards, CX8BIT
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Hello! Thanks for the response. My knowledge of electronics it's pretty limited right now. Based on your comments, I've identified 2 problems: 1) Intermodulation from the antenna amp near 160m. 2) Interference coming from the Ethernet cable. Pro…
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Hello, I just read that intermodulation is a weak point for this kind of antennas: https://www.sdrplay.com/community/viewtopic.php?t=1138&p=6789 Here I found better designs based on the experience of using a mini-whip in the university of Twe…
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Hello! When I listen those signals in 160m in AM, sounds like a MW stations pile up (IMD). When I turn the antenna amp off this is what happens: (Image) and this is what happens near the MW broadcasters (note, I'm using a MW attenuation filter): …
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Hello, @Powernumpty , yes, got it, the problem is that I run most of the cable vertically and close to the antenna. My main issues are the MW transmitters a few kilometers away (18km). (Image) From LF to 160m it's all unusable due to broadcasters…
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Hello! Here are my tests results with different cables: RG6 (quad shielded) using heating pipes as GND: (Image) RG58 (cheap) using heating pipes as GND: RG58 (cheap) using a copper rod as GND: (Image) Conclusion: When I installed the RG6, th…
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Martin, thanks for your answer. I live in Montevideo, Uruguay, and most of the countries here in South America don't have Over-the-horizon radars. I think I'm out of range of most of them, but I know the signals could bounce in the ionosphere. T…
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@Powernumpty ! 1 and 4) I'll move the antenna to a higher location and try to use RG6 (shielded 75ohm cable normally used for satellite television) to try to reduce the feed line noise. 2) I haven't used a magloop yet. The university of Twente u…
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Hello! Thanks for your help! I tested the filter, that wasn't the problem. The problem was a faulty SMA pigtail I was using (brand new). Now the everything works prefect! Thanks guys! 73! CX8BIT!
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Hello, thanks for the responses guys! I did remove the nooelec mw bandstop filter because the attenuation was so high that I couldn't hear HAM bands (S1 level after putting the filter on 40m). This is strange since I get the OV indicator when I don…
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Awesome, thanks @jks !