purplesat.com
SATELLITE INTERFERENCE

PURPLESAT MOTORISED SATELLITE SYSTEMS
purplesat_satellite_interference
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.

PURPLESAT MOTORISED SATELLITE SYSTEMS

CONTENTS 

  • SATELLITE INTERFERENCE GRAPH L C KU KA
  • SATELLITE ALL BAND SPECTRUM & L BAND USE
  •  
  • SOURCES OF INTERFERENCE
  •  
  • SPECTRUM ANALYSER OF INTERFERENCE NEAR PHONE MASTS / BUCS
  • UK RF SPECTRUM USE NEAR SATELLITE
  • MORE DETAILED INFORMATION ON NOISE
  • UK FREQUENCY MAPS V SATELLITE USE
  • PURPLESAT EXTERNAL REFERENCES FOR INTERFERENCE ON SATELLITE

 

  • TECHNIQUES TO HELP DEAL WITH INTERFERENCE
  • ELECTRICAL FAULTS THAT CAN EFFECT SATELLITE SYSTEMS
  •  

PURPLESAT MOTORISED SATELLITE SYSTEMS
SATELLITE INTERFERENCE OF KU C KA L BAND 
purplesat satellite interference diag
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.

BACK TO TOP OF PAGE

PURPLESAT MOTORISED SATELLITE SYSTEMS

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

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.


MORE INGFORMATION ON OUR MAIN SITE HERE

PURPLESAT MOTORISED SATELLITE SYSTEMS


          
07931846757
Switch to desktop site
sc