Hi group,
found this fine Freeware spurii on URL: http://www.hydesign.co.uk
The Spur Search program allows analysis of possible spurious products generated
within a radio system using multiple oscillators.
One swept (eg 1st LO) and up to three fixed (eg 2nd LO / system clock etc.) can
be specified and a search carried out to determine is any combinations of
frequencies cause a product in, or traversing a bad of interest.
A very useful tool for discovering mysterious lines on my
spectrogram-screen. The following table gives an impression of my working
conditions near the big commercial stations DCF42 and DBF39:
the VFO is "Variable" (abt 1 kHz above rx-freq)!
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Spurii Search V2.12 15:49:01 28.12.00
Search for spurii in band 135.7kHz to 138kHz
Variable=136.7kHz to 138.8kHz
Fixed1=129kHz
Fixed2=138.3kHz
Fixed3=136.8kHz
----------------------------------------------------------------------
+1*Fixed3 (136.8kHz)
+1*Fixed1+5*Fixed2-5*Fixed3 (136.5kHz)
+1*Variable (136.7kHz to 138.8kHz)
-1*Variable+2*Fixed3 (136.9kHz to 134.8kHz)
-1*Variable+1*Fixed2+1*Fixed3 (138.4kHz to 136.3kHz)
+1*Variable-1*Fixed2+1*Fixed3 (135.2kHz to 137.3kHz)
-1*Variable+2*Fixed2 (139.9kHz to 137.8kHz)
+1*Variable-2*Fixed2+2*Fixed3 (133.7kHz to 135.8kHz)
+1*Variable+1*Fixed1+4*Fixed2-5*Fixed3 (134.9kHz to 137kHz)
-1*Variable+1*Fixed1+5*Fixed2-4*Fixed3 (136.6kHz to 134.5kHz)
+2*Variable-1*Fixed3 (136.6kHz to 140.8kHz)
-2*Variable+3*Fixed3 (137kHz to 132.8kHz)
+2*Variable-1*Fixed2 (135.1kHz to 139.3kHz)
-2*Variable+1*Fixed2+2*Fixed3 (138.5kHz to 134.3kHz)
-2*Variable+2*Fixed2+1*Fixed3 (140kHz to 135.8kHz)
+2*Variable-2*Fixed2+1*Fixed3 (133.6kHz to 137.8kHz)
-2*Variable+3*Fixed2 (141.5kHz to 137.3kHz)
+2*Variable-3*Fixed2+2*Fixed3 (132.1kHz to 136.3kHz)
+2*Variable+1*Fixed1+2*Fixed2-4*Fixed3 (131.8kHz to 136kHz)
+2*Variable+1*Fixed1+3*Fixed2-5*Fixed3 (133.3kHz to 137.5kHz)
-2*Variable+1*Fixed1+5*Fixed2-3*Fixed3 (136.7kHz to 132.5kHz)
+2*Variable-1*Fixed1-5*Fixed2+5*Fixed3 (136.9kHz to 141.1kHz)
+3*Variable-2*Fixed3 (136.5kHz to 142.8kHz)
-3*Variable+4*Fixed3 (137.1kHz to 130.8kHz)
+3*Variable-1*Fixed2-1*Fixed3 (135kHz to 141.3kHz)
-3*Variable+1*Fixed2+3*Fixed3 (138.6kHz to 132.3kHz)
+3*Variable+1*Fixed2-3*Fixed3 (138kHz to 144.3kHz)
+3*Variable-2*Fixed2 (133.5kHz to 139.8kHz)
-3*Variable+2*Fixed2+2*Fixed3 (140.1kHz to 133.8kHz)
-3*Variable+3*Fixed2+1*Fixed3 (141.6kHz to 135.3kHz)
+3*Variable-3*Fixed2+1*Fixed3 (132kHz to 138.3kHz)
-3*Variable+4*Fixed2 (143.1kHz to 136.8kHz)
+3*Variable-4*Fixed2+2*Fixed3 (130.5kHz to 136.8kHz)
+3*Variable+1*Fixed1+1*Fixed2-4*Fixed3 (130.2kHz to 136.5kHz)
+3*Variable+1*Fixed1+2*Fixed2-5*Fixed3 (131.7kHz to 138kHz)
-3*Variable+1*Fixed1+5*Fixed2-2*Fixed3 (136.8kHz to 130.5kHz)
+3*Variable-1*Fixed1-5*Fixed2+4*Fixed3 (136.8kHz to 143.1kHz)
+4*Variable-3*Fixed3 (136.4kHz to 144.8kHz)
-4*Variable+5*Fixed3 (137.2kHz to 128.8kHz)
+4*Variable-1*Fixed2-2*Fixed3 (134.9kHz to 143.3kHz)
-4*Variable+1*Fixed2+4*Fixed3 (138.7kHz to 130.3kHz)
+4*Variable+1*Fixed2-4*Fixed3 (137.9kHz to 146.3kHz)
+4*Variable-2*Fixed2-1*Fixed3 (133.4kHz to 141.8kHz)
-4*Variable+2*Fixed2+3*Fixed3 (140.2kHz to 131.8kHz)
+4*Variable-3*Fixed2 (131.9kHz to 140.3kHz)
-4*Variable+3*Fixed2+2*Fixed3 (141.7kHz to 133.3kHz)
-4*Variable+4*Fixed2+1*Fixed3 (143.2kHz to 134.8kHz)
+4*Variable-4*Fixed2+1*Fixed3 (130.4kHz to 138.8kHz)
-4*Variable+5*Fixed2 (144.7kHz to 136.3kHz)
+4*Variable-5*Fixed2+2*Fixed3 (128.9kHz to 137.3kHz)
+4*Variable+1*Fixed1-4*Fixed3 (128.6kHz to 137kHz)
+4*Variable+1*Fixed1+1*Fixed2-5*Fixed3 (130.1kHz to 138.5kHz)
-4*Variable+1*Fixed1+5*Fixed2-1*Fixed3 (136.9kHz to 128.5kHz)
+4*Variable-1*Fixed1-5*Fixed2+3*Fixed3 (136.7kHz to 145.1kHz)
+5*Variable-4*Fixed3 (136.3kHz to 146.8kHz)
+5*Variable-1*Fixed2-3*Fixed3 (134.8kHz to 145.3kHz)
-5*Variable+1*Fixed2+5*Fixed3 (138.8kHz to 128.3kHz)
+5*Variable+1*Fixed2-5*Fixed3 (137.8kHz to 148.3kHz)
+5*Variable-2*Fixed2-2*Fixed3 (133.3kHz to 143.8kHz)
-5*Variable+2*Fixed2+4*Fixed3 (140.3kHz to 129.8kHz)
+5*Variable-3*Fixed2-1*Fixed3 (131.8kHz to 142.3kHz)
-5*Variable+3*Fixed2+3*Fixed3 (141.8kHz to 131.3kHz)
+5*Variable-4*Fixed2 (130.3kHz to 140.8kHz)
-5*Variable+4*Fixed2+2*Fixed3 (143.3kHz to 132.8kHz)
-5*Variable+5*Fixed2+1*Fixed3 (144.8kHz to 134.3kHz)
+5*Variable-5*Fixed2+1*Fixed3 (128.8kHz to 139.3kHz)
+5*Variable+1*Fixed1-5*Fixed3 (128.5kHz to 139kHz)
+5*Variable+1*Fixed1-1*Fixed2-4*Fixed3 (127kHz to 137.5kHz)
+5*Variable+1*Fixed1-2*Fixed2-3*Fixed3 (125.5kHz to 136kHz)
-5*Variable-1*Fixed1+2*Fixed2+5*Fixed3 (148.1kHz to 137.6kHz)
-5*Variable+1*Fixed1+5*Fixed2 (137kHz to 126.5kHz)
+5*Variable-1*Fixed1-5*Fixed2+2*Fixed3 (136.6kHz to 147.1kHz)
73 de Bernd, DF8ZR
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