Seeing double on QRSS grabber…

January 9, 2012 | Amateur Radio, QRSS | By: Mark VandeWettering

Here is a snapshot from my QRSS grabber earlier today. You might want to click it to see it full size:

I’m curious: what phenomenon is causing the strong line doubling of the signals near the bottom? Note: not all the signals demonstrate this phenomenon, and it’s relatively rare, and commonly just fades away. Also note that the signal at the top does not show this line doubling. I suspect all the signals which are line doubled are in New Mexico.

Bonus question: I keep seeing a small wiggle like the one around 10.139975 or so, starting on 10 minute boundaries and lasting for about one minute. Anybody have any idea who that is?

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Comments

Comment from WY7A (Eric)
Time 1/9/2012 at 6:39 pm

Slight frequency shift due to magnetospeheric ducting?
http://folk.uio.no/sverre/papers/2009_MagnetoDucting-QST-LA3ZA.pdf

Comment from Peter Marks
Time 1/9/2012 at 7:52 pm

Doppler shift due to an aircraft flying towards or away from you maybe? how long does it last?

Comment from KC2UEZ
Time 1/12/2012 at 2:51 pm

Maybe you are receiving the long and short path of the signal?

Comment from Myles VK6ZRY
Time 2/5/2012 at 3:10 am

Just a simple multipath signal due to auroral effects.
Its temporary won’t happen again for at least a week

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