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Messages - ultravista

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31
I picked up what appears to be the same thing @ 6755.5 USB this evening (06/27/18) @ 9:20 PT in Las Vegas, NV.

32
I swear this sounds like HFDL at the beginning, bursts of 'hiss'. HFDL however is on published/fixed frequencies where these appear to be random. Kind of like the HF 'pips' that randomly appear across the dial. I wonder if the two are related ... they seem to be in the same RF space.

What perplexes me is the CW at the end of some. I don't know morse to translate it but it must be an identifier. Maybe amateur outside of the US?

34
The videos below are similar to some of the 'HFDL Like' signals. In addition to the freq's below, I tume them this evening at 8.321, 6.890, 6.663, 6250.5, 4949.5, and 4.720 KHZ.

6.890 KHZ - not much to see here but there is some activity.
https://youtu.be/PDz3Ca9Zp48

7970 KHZ - bursts followed by solid noise
https://youtu.be/ljFAixDImXk

7971 5 KHZ - in CW mode
https://youtu.be/w5wOrLgcNPw

7971 5 KHZ - in CW mode, you can see the CW near the end of the video
https://youtu.be/bQ71Fnz4zeY

What is the best way to also capture audio? I am tuning with a Yeasu FT-590 with a IF tap connected to an RSP2 for the waterfall display. The audio is out of the Yeasu. Turning up the volume on the Yeasu and using the laptop microphone doesn't produce a good sound - the microphone picks up every noise in the house, including a mantle clock ticking and me breathing.


35
Josh, the frequencies vary. I do not find any Google matches for the frequencies either.

The few I heard this morning had CW before or after the transmission. Just a few seconds, probably an identifier.

In Las Vegas, NV, I find these signals day and night using an active mini-whip antenna.

I'll grab screenshots or a video next time.

36
I regularly tune unknown data signals from 5-9 MHZ (possibly higher). It sounds like HDFL (bursts of uniform 'hiss') that may or may not include anything other that the bursts.

I have found a few have CW either before or after, can't tell which, but probably at the end of the transmission.

The waterfall pattern width is about as wide as  HFDL or STANAG.

I have listened to the identified signals in the WIKI and can't narrow this down.

37
MW 73?

Please explain, harmonic from a medium wave station?

38
I am receiving this station tonight on 4170 khz USB in Las Vegas, NV on a Yeasu FT-950 w/mini-whip active antenna.

Have you determined the origin of the broadcast?

39
I am listening to George Thorogood 'One Bourbon, One Scotch, One Beer' right now @ 6933 USB.

The voice is text to speech in a female voice. The signal was too low to make it what it was saying ...

Where is this broadcast from? I tuned it in Nevada with an active mini-whip.

40
HF Beacons / Re: Beacon "A" 2097 khz
« on: June 10, 2018, 0248 UTC »
I am picking this up this evening in Las Vegas, NV @ 8 PM local time.

41
I won't confront anyone, but I would like to find the source.

I walked around my neighborhood today with a Tecsun, one end of the block was stronger than the other. It clearly isn't one of my immediate neighbors. I walked 30-40 houses down the road and could stick pickup the interference.

42
General Radio Discussion / Rolling QRM - Grow Lights RFI?
« on: June 02, 2018, 1736 UTC »
https://youtu.be/4XyqMayYElc

Rolling QRM. It starts fast, slows, then stops. When it stops, the interference is present for 12 hours. Some have suggested this is Grow Lights RFI.

The fast rolling begins at roughly at the 2 minute mark

It lasts approximately 5 minutes before stabilizing, just like the ARRL states.

http://www.arrl.org/grow-light-rfi

Grow lights tend to exhibit several unique and identifiable characteristics. So far, they typically produce a broad band noise, particularly across the 40m band. It propagates over much greater distances than one might expect from devices that meet the applicable FCC limits. Other clues include:

  • Generally grow lights are set by a timer for 12 hours on and 12 hours off but this can vary

  • Once you have established the turn on time, listen to the noise as the lamp turns on. Itís generally noisier with less of a flat spectrum. This generally lasts about 5 minutes until the lamp is warm

Now ... how do I locate the source in a densely populated neighborhood? Homes, homes, everywhere ..

43
Today's video from start-up to stabilization. It takes approximately 2 minutes to start-up, the the fast rolling begins around the 2 minute mark.

https://youtu.be/4XyqMayYElc

44
From ARRL

  • Generally grow lights are set by a timer for 12 hours on and 12 hours off but this can vary

    Once you have established the turn on time, listen to the noise as the lamp turns on. Itís generally noisier with less of a flat spectrum. This generally lasts about 5 minutes until the lamp is warm
Damn, that pretty much sums up my experience exactly. Noisy and unstable for a few minutes that settles in and becomes stable.

Thank you for helping me narrow down the possible sources. Now the fun begins, which house is it emanating from. What type of directional antenna can I used with a Tecsun PL880 to direction find it?

45
Is it typical for the interference to roll fast, then progressively slow, until it comes to a near standstill?

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