Spectrum Analyzer 8591c for c-band

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CATVTECH011

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Sep 3, 2008
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Can anyone shed some light on the setup procedure for peaking a c-band signal with a spectrum analyzer?
 

tvropro

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Mar 9, 2007
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Can anyone shed some light on the setup procedure for peaking a c-band signal with a spectrum analyzer?

From what I know your looking for peak on the specific satellite and transponder, while nulling out the adjacent satellite signals, polarity and thermal noise.
 

Anole

SatelliteGuys Master
Sep 22, 2005
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general idea

Roughly speaking, the C-band is heterodyned down to the 950-1450 mhz range.
So, (C-band signal - 5150mhz LO = spectrum analyzer signal)
The receiver selects whether that's a vertical or horizontal transponder.

ie: Galaxy 16 @ 99° West - transponder 15 Horizontal = 4000 mhz
so, 5150 - 4000 = 1150mhz
You'll find that 1150mhz signal on the "loop out" connector of your receiver.
Depending on the equipment, it may be known by a different name, but it's just a buffered copy of the signal from the LNB.
Under some circumstances, you could tap the signal between the LNB and receiver.

As to channel spacing, take a look at the Lyngsat listing above showing transponder frequencies.
 

jayn_j

Press On Regardless
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Sep 29, 2003
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Wouldn't you just set CF to the expected frequency, the span to the band width (1 GHz should work) and then perform a peak search function. This should put a marker at the highest peak and set the span to include significant peaks. You can then use marker -> next Peak to find the other peaks in the band.

I once worked on the firmware for these analyzers in a past life (25 years ago)
 
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