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Shortwave Broadcast Discussions regarding shortwave broadcasters

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Old 07-08-2014, 6:38 PM
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Default Signal jamming on 7.450 AM

There is a warbling sound of a digital signal on 7.450 MHz AM that is covering an English speaking program right now. I am reading an S-9 on the radio's meter.
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Old 07-08-2014, 7:36 PM
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It may not be jamming, just propagation. Don't forget about the 3 ITU regions. The 40/41 bands have different usages.
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Old 07-10-2014, 11:00 PM
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Don't rule out RFI.

Whenever I hear 'warbling' near a broadcast signal, that's generally the first thing I think of.

I have several devices whose switching power supplies / DC-DC converters, etc. put out weak signals in various places in the SW spectrum.
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Old 07-12-2014, 10:18 AM
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^^^ Agreed. Although it looks like China is on that freq. When was this and was it a Chinese broadcast or Greek?
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Old 07-17-2014, 12:45 AM
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7454khz and it's been there for months (if not longer) and it interferes with WRMI's transmission on 7455.
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Old 07-17-2014, 2:11 AM
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Is it teletype?
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Old 07-17-2014, 9:55 PM
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On 7455 kHz is an FSK signal, 850 Hz shift, 50 Bd rate, and encrypted. It is possibly USN, out of Cutler, ME, they have used that freq for years.

T!
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