10 metre band squiggles

Anyone know what these things are? I seem to only hear them between 26 and 30 MHz when the band is open to the north.

Category:

Science & Technology

Tags:

• amateur
• radio
• ic706

[dxer22000]

this is caused by high powered RF welders in SE Asia. I often hear them here in Australia via F2 propagation

[Learjet66]

@dxer22000 Thanks mate for solving the mystery.

[kc9iqr]

I have heard similar noises when the sun is comming around the horizon, very very early in the morning before the sun comes out ,I ponder this might be noise in relation to wind and power lines ? or a freq. driven device like a motor cnc or some type of drive for a motor or robot ?

[Learjet66]

No not wind, powerlines or motors. It's not local. A fellow Ham 5km away hears the same thing. We think it's an F2 hop away.

[kafostad]

does get this sound on 11 meters SSB as well when dx is good

[Learjet66]

Yes I've heard them from 26 - 30 MHz from here. Reports to 50 MHz from other Hams.

[JettaJ1]

i know this exact sound when skip is going to arrive on 11 meter bands. and sometimes rarely on 10 meters. awesome sound:)

[FrancisDaBadAssBiker]

:o

oh me gosh

ALIENS!!! were all gonna die xD

[Roosta35]

It's Heterodyne...u get that sound when the DX is comming in

[Karl036]

I do spend many hours on 28MHz (SSB mode) and I hear it often. When I hear these sounds I know the band is open to somewhere..

73...Karl

VK7HDX

[jijiathome]

I can hear them sometimes above 40MHz, also on 21MHz DE JE7IDA QM09