What's That Funny Diagonal Line? (
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- Bob, K6ECM, sees an interesting signal that creates a diagonal line in his waterfall display. What could this signal be and where does it come from?
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That's the most informative explanation I've ever seen, as winter field day was winding down, I explained ionosondes to a local ham who was curious about those signals on her waterfall. She was fascinated by my explanation but she would be blown away by your explanation.
Kudos and 73 to you Dave!
Thank you for a very interesting and detailed explanation. Dispels the guesses I have heard in the past.
Thank you for explaining; I always wanted to know what was causing that phenomenon. I finally put a face to the sound when I received my SDR. You are the best Dave! 73
I worked at Millstone Hill radar in Westford MA in the 80s. The U Lowell digisonde transmitter is located there. I remember walking thru the room where the main equipment racks were
I always wondered what that was. Thanks for the great explanation.
Ive been wondering about the same thing FOR YEARS! (more than 20) haha, thanks a lot, learned something new today
Thanks. That answers a question I've had since I began the hobby..............................
Thank you so much for the explanation. I am an SWL and see this all the time.
Some of world’s militaries also run them (or at least they used to) to maintain automatic link establishment (ALE) networks on HF. IIRC, the HF comms are the SHTF backup mode.
Another great and informative video Dave, concerning something a lot of folks might not know ! Thank you Sir!
Great job, Dave!
Fascinating. Thanks
Thank you. I had just been assuming that these were from meteorites or something like that.
I worked in the HF receive site, of a military comms base, where we had one of the AN/TRQ-35 receivers. The dispalys were interesting.
Thanks Dave! I’ve seen this ever since I got my ft-710. Had no idea what it was. Had me curious. But as I only do voice so far, like stated in your video it’s gone so fast I never bothered to investigate.
I thought this was a natural phenomenon 😂. Thanks for the info
Interesting video. Yes for spread spectrum.
I have always wondered what those were!!! Thanks for this!!
In Australia, our government has them publicly available and luckily I have one relatively close. When 40m starts dropping for the local group I can check against the ionogram and that tail where it penetrates through the layers (the critical frequency) will end up just below 7Mhz.
They are handy to give some info about local propagation.
Fascinating!!!! I was always curious what those blips were I was always curious who knew the Max Usable Frequency. Great video well done!!!! -K0JWQ🫡
Dave, you mentioned that it doesn't hit every frequency, but is that what they are actually transmitting, or is it just the sample rate of the waterfall display?
The digital ones step the frequency between soundings.
@@davecasler I remember hearing these sweeps back when I was doing shortwave listening years ago. At the time, I thought someone was just tuning through while transmitting.
Great video Dave
Cool tanks
Get a haircut Dave!!! lol
No way! I’m digging the crazy hair!
Are you getting paid for product placement by Evian? You could expand to Coke or Pepsi. It is big business.
Sadly, no! I reuse the Evian bottle as my everyday water bottle and throw it away after a couple weeks, then start a new one. 73, Dave, KEØOG
Thanks Dave - Enlightening description. - Cheers! VE3GHP
Folks performing SWR sweeps also generate these type traces...
I suspect modern radios use short blips of low power on a series of frequency points to sweep the SWR, not a CW sweep across multiple bands with high power. And antenna analyzers typically use milliwatts of power.
Ionosondes can put out up to several thousand watts but may be as low as a few hundred.
Those won't be straight though, people will key for a sec, go up in frequency and then go down generally, so you'll end up with a straight line and then zig-zags on the band, they are also much slower
And stay within the band.
That is a pretty dang cool name you have there 👀
Some would say the signals are emitating from some HAARP stations that are used to manipulate weather.
Manipulate space weather by studying ionospheric heating. Terrestrial weather takes place almost entirely in the troposphere. The ionosphere is way above that. 73, Dave, KEØOG
Thanks, Dave. A very good video. Learned something. N0QFT, Glen