Radar Interference on 4ghz.satellite TVRO systems

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1. There have been several previous posts by individuals receiving
temporary external interference excluding terrestrial interference on
their 4 ghz. satellite tv systems.

2. Two of the most probable sources of the interference is airborne and
marine radar. C band lnbs have a wide bandpass 2.8 -4.8 ghz. The
satellite tv receiver is FM and susceptible to front end signal
overload. The receiver will process the strongest signal received.

3. Coastal and marine navigational radar frequencies are 2,900-3,650
mhz. which are slightly below the 3,700 mhz. beginning range of C band
downlinked signals. Possible interference from marine water and
airborne radar may adversely affect TVRO transponders 1-5. The airport
altimeter band 4,250-4,400 mhz. will affect TVRO channels 22-24 at sites
located near airports. These frequencies are slightly above the 4,200
mhz. TVRO ending range.

4. The solution is to narrow the bandpass of signals entering the C
band lnb. Microwave Filter <www.microwavefilter.com > sells an out of
band interference filter designed specifically for these interference
sources.

 

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On Thu, 04 Nov 2004 18:02:27 -0500, john wilson <jwilson9@erols.com>
wrote:

>1. There have been several previous posts by individuals receiving
>temporary external interference excluding terrestrial interference on
>their 4 ghz. satellite tv systems.
>
>2. Two of the most probable sources of the interference is airborne and
>marine radar. C band lnbs have a wide bandpass 2.8 -4.8 ghz. The
>satellite tv receiver is FM and susceptible to front end signal
>overload. The receiver will process the strongest signal received.
>
>3. Coastal and marine navigational radar frequencies are 2,900-3,650
>mhz. which are slightly below the 3,700 mhz. beginning range of C band
>downlinked signals. Possible interference from marine water and
>airborne radar may adversely affect TVRO transponders 1-5. The airport
>altimeter band 4,250-4,400 mhz. will affect TVRO channels 22-24 at sites
>located near airports. These frequencies are slightly above the 4,200
>mhz. TVRO ending range.
>
>4. The solution is to narrow the bandpass of signals entering the C
>band lnb. Microwave Filter <www.microwavefilter.com > sells an out of
>band interference filter designed specifically for these interference
>sources.

This filter WILL work.

http/www.chesapeake.net/~scambron/plots/interferance.html

I do not recall the satellite.

scambron

 

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On Fri, 05 Nov 2004 03:25:43 GMT, scambron@chesapeake.net (scambron)
wrote:

>On Thu, 04 Nov 2004 18:02:27 -0500, john wilson <jwilson9@erols.com>
>wrote:
>
>>1. There have been several previous posts by individuals receiving
>>temporary external interference excluding terrestrial interference on
>>their 4 ghz. satellite tv systems.
>>
>>2. Two of the most probable sources of the interference is airborne and
>>marine radar. C band lnbs have a wide bandpass 2.8 -4.8 ghz. The
>>satellite tv receiver is FM and susceptible to front end signal
>>overload. The receiver will process the strongest signal received.
>>
>>3. Coastal and marine navigational radar frequencies are 2,900-3,650
>>mhz. which are slightly below the 3,700 mhz. beginning range of C band
>>downlinked signals. Possible interference from marine water and
>>airborne radar may adversely affect TVRO transponders 1-5. The airport
>>altimeter band 4,250-4,400 mhz. will affect TVRO channels 22-24 at sites
>>located near airports. These frequencies are slightly above the 4,200
>>mhz. TVRO ending range.
>>
>>4. The solution is to narrow the bandpass of signals entering the C
>>band lnb. Microwave Filter <www.microwavefilter.com > sells an out of
>>band interference filter designed specifically for these interference
>>sources.
>
>This filter WILL work.
>
>http/www.chesapeake.net/~scambron/plots/interferance.html
>
>I do not recall the satellite.
>
>scambron



Yikes, cheaper to build a screen!!!