What's This Minor Audio Distortion From?

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What's This Minor Audio Distortion From?

Postby NoelC » Fri Apr 21, 2017 6:20 pm

From time to time I've tuned in the US time station WWV and noticed a little bit of distortion in the time announcement in the form of a "crackle". Specifically, it's on the word "hours", right on the first syllable.

Here are some examples:

http://Noel.ProDigitalSoftware.com/Foru ... dHours.wma
http://Noel.ProDigitalSoftware.com/Foru ... Hours2.wma
http://Noel.ProDigitalSoftware.com/Foru ... Hours3.wma
http://Noel.ProDigitalSoftware.com/Foru ... Hours4.wma
http://Noel.ProDigitalSoftware.com/Foru ... Hours5.wma

The waterfall display doesn't really show anything too exciting, with maybe just a little dark area showing out beyond the where there's energy. I don't know if that might indicate there's some kind of overload happening or what.


It seems to happen at various signal strengths, though perhaps more (or it's more noticeable) when the signal is strong. It happens whether or not I use AM or SAM mode. AGC doesn't matter, nor does adjusting the audio width. Neither does the setting for the sample rate or decimation correct it.

I've heard it on other parts of the announcer's speech, but much less often. I don't think I've ever heard the word "hours" without it. I just caught it happening pretty badly on one of the weather announcements...

http://Noel.ProDigitalSoftware.com/Foru ... eather.wma

Any ideas? It's not a big problem, just a minor annoyance.

I'm starting to wonder if it could be a problem with the transmission, since I haven't sensed it on other stations, but their equipment is rather more expensive than mine, so I'm not quick to rush to that judgment.


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Posts: 350
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: What's This Minor Audio Distortion From?

Postby g1hbe » Fri Apr 21, 2017 7:56 pm

I'd say that was a transmission fault, Noel. It seems to take the same form every time, so it's unlikely to be in your setup.

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