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Author Topic: 28 MHz "Frequency Sweeping" Signals?  (Read 6990 times)
W2MV
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Posts: 207




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« on: December 19, 2011, 09:24:46 AM »

I've noticed that while operating on 10 meters, CW or SSB, it isn't long before I hear a signal "sweeping" across my operating frequency. I can also see that signal on my spectrum scope....moving up or down.


Does anyone have any idea what those signals are?

Tnx
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W1AEX
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« Reply #1 on: December 19, 2011, 10:26:20 AM »

I see the same thing on my panadapter. Some rigs have a function that allows them to plot the SWR of the antenna in use across a complete band. I've wondered if the rapidly moving signal we are hearing and seeing is one of these rigs making a low powered sweep.

Rob W1AEX
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KL3HY
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Posts: 117




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« Reply #2 on: January 30, 2012, 01:19:56 PM »

I found this thread a little late, but does it look anything like this:

http://www.tibor.org/slow-sweep.jpg

I can almost always find something like this on the 80m band lately.
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W3HKK
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« Reply #3 on: March 01, 2012, 04:34:48 PM »

w1aex:  makes sense to me...didnt know about the swr sweep function in some rigs. But what I see is  what looks like a carrier frequency (CW) moving at a steady pace across the band.  And Ive seen/heard it on numerous bands including 40/80. 

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N3QE
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« Reply #4 on: March 02, 2012, 01:31:29 PM »

Ionosphere Sounder? I know some hams who work for NOAA and government agencies and they tell me that the "clean" single-carrier sweeps I hear are almost certainly sounders.

Some of the waterfalls I've seen look like wideband harmonic noise from switching power supplies which can drift and doodle around the HF bands at varying rates.
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