Hi Rik
& Graham,
Thanks
for the replies.
All
understood now, the screen shot certainly shows it up.
I didn’t
relate multi path fading to what I was seeing on the display as I am normally
used to seeing/hearing single narrow signals fading differently from
different sources. So I hope I am correct in saying that with the three
distinct signals from the NDB the additive & subtractive properties of each
multi path signal even though closely related in frequency will react so
noticeably differently at the receiver even from the same source.
I missed
Grahams report on the UK500KHZ group.
73
Gary –
G4WGT.
I assume its selective fading , you can see it at 100 Hz
separation at >
add the shot with a few pointers ?
Nb .. check out the 500 band in those day's , no
mal-adjusted cw signals
Sent: Sunday,
December 28, 2008 3:15 PM
Hi LF,
Just made an interesting observation
regarding QSB at 508KHz.
For my own benefit I have started running a
slow SpecLab showing 500 to 510KHz & capturing for evaluation.
Occasionally the NDB “Z” shows
up. The strange thing is that even though the carrier on 508KHz & the two
ID offsets at 509 & 507KHz are relatively close they each display at
different depth of fading or an out of phase fade pattern.
I am unsure why this should be, any
comments please, see capture at link :-
http://myweb.tiscali.co.uk/wgtaylor/ZNDB.jpg
73,
Gary - G4WGT - IO83QP.
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