[Elecraft] HF noise.....30m

[r miles]

Often on 30m. Starting arnd. 10115 & anywhere from 20 kc wide to out of
the top of the band. A fast pulse. Only happens after dark in NA. I
believe it's OTH radar. Of course no one has ever said it was theirs. My
K3 doesn't block it as some nights it's 20 db over S9.

Once in a while on 10120 there's an extremely strong CW signal sending
only a series of 5 letter or number groups. On less than an hr. then
gone. No I D. Seems to come from Cuba.

The RTTY on 10100 is a 10kw German stn. sending WX info to ships at sea.
Makes a gud prop beacon.

Unfortunately, the illegal SSB stn.s are discovering 30m. For such a
tiny ham band we seem to attract a lot of strange signals.

K9IL

[Fred Jensen]

There's an 850 Hz RTTY station near the upper end of the band most
evenings, fairly strong in N. Cal., which seems to be encrypted -- at
least I can't print anything intelligible from it. It may be there 24/7
and fades due to daylight prop, don't know.

I've also heard a couple of the Russian single-letter beacons once or
twice but they didn't hang around long.

I'll listen for the OTH noise tonight.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2015 Cal QSO Party 3-4 Oct 2015
- www.cqp.org

Post by r miles
The RTTY on 10100 is a 10kw German stn. sending WX info to ships at sea.
Makes a gud prop beacon.

[Thorpe, Jeffrey]

Does the CW signal show up on a particular schedule? Does it seem to repeat its transmission a lot?
It would be interesting to hear a modern numbers station like this - they've really become scarce these days since the rise of the internet.

Jeff
KG7HDZ

[Charlie T, K3ICH]

Anyone have any idea what those "weeblies" are on ten meters? They
typically start high in frequency and flitter past the receiver then stop
abruptly. They sound like a very unstable oscillator, almost like there's a
random (or encoded ?) narrow frequency modulation as they move lower down
the band. They are quite noticeable on the panadapter display and appear to
have several rates of downward frequency shift. Also, occasionally, a wide
band "hump" for lack of a better word. will appear in the display and pop
off a second later as quickly as it came. I've tried tracking them down,
but they all seem to not be coming from anything in close proximity to me.

I've heard these weeblies for many years. They're not a QRM problem since
they're only in the passband for a second or so and occur at about 1 to 5
per minute. It's just that this is the first time I've been able to "see"
them on the screen. The display kinda reminds of the Quark capture displays
we used to see.

73, Charlie k3ICH

----- Original Message -----
From: "Thorpe, Jeffrey" <jthorpe at liberty.edu>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Tuesday, October 14, 2014 9:39 AM
Subject: Re: [Elecraft] HF noise.....30m

Post by Thorpe, Jeffrey
Does the CW signal show up on a particular schedule? Does it seem to
repeat its transmission a lot?
It would be interesting to hear a modern numbers station like this -
they've really become scarce these days since the rise of the internet.
Jeff
KG7HDZ
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[Ken Chandler]

Charlie etal
I have seen that here though it tends to stay.
Sunday I had a weird thing happen, on the p3 scope, a tone would sound then a herring bone effect would occur across the whole p3 screen, these herring bones! We're spaced about every 1khz top and bottom.
This Tone, maybe a fishing net sounder! Or even OTHR, Went off every minute or so, making 10m impossible to use.
Anyone know why his happens and or what causes it!!

Ken.. G0ORH

Sent from my iPad

Anyone have any idea what those "weeblies" are on ten meters? They typically start high in frequency and flitter past the receiver then stop abruptly. They sound like a very unstable oscillator, almost like there's a random (or encoded ?) narrow frequency modulation as they move lower down the band. They are quite noticeable on the panadapter display and appear to have several rates of downward frequency shift. Also, occasionally, a wide band "hump" for lack of a better word. will appear in the display and pop off a second later as quickly as it came. I've tried tracking them down, but they all seem to not be coming from anything in close proximity to me.
I've heard these weeblies for many years. They're not a QRM problem since they're only in the passband for a second or so and occur at about 1 to 5 per minute. It's just that this is the first time I've been able to "see" them on the screen. The display kinda reminds of the Quark capture displays we used to see.
73, Charlie k3ICH
----- Original Message ----- From: "Thorpe, Jeffrey" <jthorpe at liberty.edu>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Tuesday, October 14, 2014 9:39 AM
Subject: Re: [Elecraft] HF noise.....30m

Post by Thorpe, Jeffrey
Does the CW signal show up on a particular schedule? Does it seem to repeat its transmission a lot?
It would be interesting to hear a modern numbers station like this - they've really become scarce these days since the rise of the internet.
Jeff
KG7HDZ
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[Rick Bates]

A digitally controlled motor can do that. Think dishwasher, washing machine...

Mine does it but I can tell when a neighbor does chores too.

73,
Rick wa6nhc

Tiny iPhone 5 keypad, typos are inevitable

Post by Ken Chandler
Charlie etal
I have seen that here though it tends to stay.
Sunday I had a weird thing happen, on the p3 scope, a tone would sound then a herring bone effect would occur across the whole p3 screen, these herring bones! We're spaced about every 1khz top and bottom.
This Tone, maybe a fishing net sounder! Or even OTHR, Went off every minute or so, making 10m impossible to use.
Anyone know why his happens and or what causes it!!
Ken.. G0ORH
Sent from my iPad

Anyone have any idea what those "weeblies" are on ten meters? They typically start high in frequency and flitter past the receiver then stop abruptly. They sound like a very unstable oscillator, almost like there's a random (or encoded ?) narrow frequency modulation as they move lower down the band. They are quite noticeable on the panadapter display and appear to have several rates of downward frequency shift. Also, occasionally, a wide band "hump" for lack of a better word. will appear in the display and pop off a second later as quickly as it came. I've tried tracking them down, but they all seem to not be coming from anything in close proximity to me.
I've heard these weeblies for many years. They're not a QRM problem since they're only in the passband for a second or so and occur at about 1 to 5 per minute. It's just that this is the first time I've been able to "see" them on the screen. The display kinda reminds of the Quark capture displays we used to see.
73, Charlie k3ICH
----- Original Message ----- From: "Thorpe, Jeffrey" <jthorpe at liberty.edu>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Tuesday, October 14, 2014 9:39 AM
Subject: Re: [Elecraft] HF noise.....30m

Post by Thorpe, Jeffrey
Does the CW signal show up on a particular schedule? Does it seem to repeat its transmission a lot?
It would be interesting to hear a modern numbers station like this - they've really become scarce these days since the rise of the internet.
Jeff
KG7HDZ
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[Dan Maase AC6DM via Elecraft]

These "weeblies" are all over the 10 meter band here in northern Calif
Monday through Saturday; gone on Sunday. Best I can find is that they are
radiated emissions from HF ultrasonic welders (used to seal plastic
packaging, emboss car mats, etc.) They sound like they are a high power
oscillator which changes frequency during the welding operation; starting
high and decreasing in frequency as the weld is accomplished. Such welders
are not supposed to operate in the ten meter band in the US, so I suspect
they are "rogue", operating international.
Dan
AC6DM


Anyone have any idea what those "weeblies" are on ten meters? They
typically start high in frequency and flitter past the receiver then stop
abruptly. They sound like a very unstable oscillator,



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[Fred Townsend]

If memory serves me right there is a ICM band between 10 and 11 meters that would be a logical place for an welder. Assuming they are using a power oscillator the signal could be quite broad band and unstable just like a microwave oven. It also sounds like a foreign design. I think a call to the FCC is in order.

Fred, AE6QL


-----Original Message-----

From: Dan Maase AC6DM via Elecraft <elecraft at mailman.qth.net>
Sent: Oct 14, 2014 8:06 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] HF noise.....10 M
These "weeblies" are all over the 10 meter band here in northern Calif
Monday through Saturday; gone on Sunday. Best I can find is that they are
radiated emissions from HF ultrasonic welders (used to seal plastic
packaging, emboss car mats, etc.) They sound like they are a high power
oscillator which changes frequency during the welding operation; starting
high and decreasing in frequency as the weld is accomplished. Such welders
are not supposed to operate in the ten meter band in the US, so I suspect
they are "rogue", operating international.
Dan
AC6DM
Anyone have any idea what those "weeblies" are on ten meters? They
typically start high in frequency and flitter past the receiver then stop
abruptly. They sound like a very unstable oscillator,
--
View this message in context: http://elecraft.365791.n2.nabble.com/HF-noise-30m-tp7593789p7593884.html
Sent from the Elecraft mailing list archive at Nabble.com.
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