HFU HF Underground
Technical Topics => Equipment => Topic started by: alpard on May 06, 2023, 0902 UTC
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I was listening to this weak signal on 5955 kHz in the early morning around 7am. Really quiet outside, all seems asleep because it is weekend.
And at 1:33 and 1:37 of the video, you can see and hear the RF jolt or KICK, of about 59+30dB.
What could caused it? Do you ever get kick like that during shortwave reception?
I was guessing could it have been thunder and lightening outside? or someone nearby switching on something powerful electrical device?
The RX antenna was Longwire in the garden of about 30 meters long.
https://www.youtube.com/watch?v=8uC5SKHcA_A (https://www.youtube.com/watch?v=8uC5SKHcA_A)
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A CB'er with a piece of crap amp driving by can do it, but lightning strikes propagate RF for hundreds of miles.
It's storm season in the U.S., you can hear the pops coming from the Great Plains east to the Atlantic, and from South and Central America. It last's until the end of October. It's why I used to do my pirating from April to October on weekend mornings, no point in fighting the noise.
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I cannot see any trace of single CBers in my neighbourhood - not a single CB antenna is in sight, and none are heard on CB band apart from the DX cbers from Italy or USA when the band opens up. But lightening and thunder, - right enough, the weather this morning was cloudy and looked like will rain heavily during the day.
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Given my proximity, I get to hear moderate static crashing many nights on the tropical bands and lower frequencies.
About the clip, it could also be much closer, like a RFI blip from someone nearby turning on a device with an in-rush current.
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I'd put money on someone in the house or close to the house turning on a light or some other device that's ac line connected. On the R71 turn the nb on and set the nb level low, it should take out strong pops like that while not degrading the signal of interest.
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Yeah, will turn on the NB on the R71. It works well on blocking the severe motor grinding type noise, but at the same time it used to degrade received signal audio too. But the level had to set high level. Due to that, I tend to not to use it, but setting the NB level to minimum low level might do the trick? Thanks for your info and advice.