To a lot of people noise/ interference is too boring a subject but to us it's
a very BIG part of our job installing Satellite Systems. Knowing how
best to deal with interference/ noise is as important or more important
than dish sizes- get the noise down & you've got the dish size down.
It's a busy world out there for any RF engineers.
WELCOME TO OUR WORLD.
SATELLITE INTERFERENCE OF KU C KA L BAND
SATELLITE INTERFERENCE DIAG KU C KA L BAND
(The large peaks top & bottom of high & low band are an extreme example of being close to
mobile phone masts bleeding over the IF / L band (eg 800MHz 900MHz 1800MHz 1900MHz
2100MHz) plus their microwave links, but it can be much noisier than that & you need to know
how to deal with it)
INTERFERENCE FROM MOBILE PHONE MASTS/ DECT PHONES/ MICROWAVE
RELAYS- BACKHAUL POINT TO POINT / OH TELEPHONE CABLES/ ELECTRICITY
PYLONS OH CABLES / AIRPORTS / INDUSTRIAL AREAS /
INTERFERENCE / NOISE & ELECTRICAL LEAKAGE is a BIG subject - there may be
some 3rd party data that is not checked yet - this page is NOT live if you have stumbled
on it- purplesat does not warrant any information - although interference/ electrical
leakage problems are in many ways a true mystery with infinite harmonics & interactions.
This is to help remove some mysteries.
Interference is a bane & a big subject today & a growing one with the increase of wireless
use/ WIFI networks/ mobile phone (cell phone) network & coverage, increases in electrical
devices in the typical home, business or on the road.
Dealing with & conquering NOISE / INTERFERENCE & ELECTRICAL LEAKAGE faults is as
important or in many cases, more important than dish size & signal acquisition. Interference
can ruin a good installation causing good signals to break up or drop below break up level.
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SATELLITE SPECTRUM BANDS & IF L BAND USE
LNB TYPE INPUT FREQUENCY IF L.O. FREQUENCY
Ku band Universal Low Band .. 10700 MHz - 11700 MHz 950-1950MHz 9750MHz
Ku Band Universal High Band ... 11750 MHz - 12750 MHz 1100-2150MHz 10600MHz
Ku Band Wideband LNBs ...........10700 MHz - 12750 MHz 10700-12750MHz 10400MHz
UNITRON WIDEBAND LNBs
kU SKY Q.................................
SRC/ Unicable ..........................10700 MHz - 12750 MHz subject to tps being used
C Band standard ................... 3400 MHz - 4200 MHz 5150MHz
C Band Extended .................. - MHz - 4800 MHz
Ka Band uses theoretically ........ 12750 MHz - 40,000 MHz
Intermediate satellite frequency [if] LO
L Band (IF) ku low band...H/V... 950 MHz - 1950 MHz 9750 MHz
L Band (IF) Ku High Band.H/V... 1100 MHz- 2150 MHz 10600 MHz
L Band (IF) Ku Wideband H/V ....290-300 MHz - 2340-2350 MHz 10400 10401 MHz
There are other non Universal Ku band lnbs with different LOs in use, mainly broadcast VSAT use.
L Band (IF) C band ...... 950 MHz - 1750 MHz
L Band (IF) Ext C Band . 1950 MHz - 2150 MHz
L Band (IF) Ka band ...... 950 MHz - 2150 MHz
The polarization of the suspected interference can also makes a difference - vertical interference will cause more interference on a vertical antennae & interference on a horizontally polarized antenna will be picked up more on horizontal antennae but at L band that is less of an issue as it's more about the circuits / tuners & cabling, however, don't discount a Ku Band antenna in a Ku waveguide as stopping the much wider L band entering the waveguide completely & being picked up on the antenna or bypassing it entirely & entering the LNB & dancing over the lnb's circuits- waveguides, cables / tuners etc.. An antenna/ wavewguide only attenuates a %, if the power from say a nearby mobile phone mast is very powerful- it can enter a smaller waveguide or just swamp the area, even professional satellite meters.
Almost all frequencies can cause interference/ noise / second/ 3rd harmonics etc. landing on cables/ components & causing adverse effects such as mal effecting a Local Oscillator etc.. but are not on any direct or secondary frequencies, although harmonics from them could be.
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