Funny Stuff

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Archived from groups: alt.video.satellite.mpeg-dvb (More info?)

I have a C-Band system that I use with a Pansat 2500A. I use a C-band
polorotor that also has a Ku-Band LNB. What is funny is I did a blind scan
on the Canadian satellite located at 118.7 W.
Using the linear Ku-Band Lnb, I was able to receive some of the programming
on Echo 7 at 119 W. It did not matter what polarity I selected H or V. I
could still receive about 40 channels off Echo 7. In fact the Echo 7
satellite overpowered the Canadian E2 signal. Has anyone experienced
anything like this before??

 

[Guest]

Archived from groups: alt.video.satellite.mpeg-dvb (More info?)

Jfleeter wrote:
> Pansat 2500A...linear Ku-Band Lnb
> ...Canadian satellite located at 118.7 W.


Anik E2 - nobody home...

http/www.lyngsat.com/anike2.html


> ...Echo 7 at 119 W. ...It did not matter
> what polarity I selected H or V. I could
> still receive about 40 channels off Echo 7.


The only signals that you should get FTA are music and NASA TV.

http/www.lyngsat.com/echo7.html

DBS is different frequency than FSS - so check your LNB LO settings.
Some combinations might have image rejection issues (in other words,
you'll pick up signals on the other side of the LO). I'm not positive
that this is a practical problem or not.

CP (right/left) will come through equally on both H and V. And vice
versa.


Advice - give up on Anik E2 and get set up properly (LNBF) for Echo 7
for the NASA TV and music.

 

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"Jfleeter" <jfleetwd@mycvs.net> wrote in
news:1105396411.149283@localhost:

> I have a C-Band system that I use with a Pansat 2500A. I use a C-band
> polorotor that also has a Ku-Band LNB. What is funny is I did a blind
> scan on the Canadian satellite located at 118.7 W.
> Using the linear Ku-Band Lnb, I was able to receive some of the
> programming
> on Echo 7 at 119 W. It did not matter what polarity I selected H or V.
> I could still receive about 40 channels off Echo 7. In fact the Echo 7
> satellite overpowered the Canadian E2 signal. Has anyone experienced
> anything like this before??
>
>

Echostar and Anik do not use the same frequencies so they can co-exist
quite comfortably at the same general location in the geostationary arc.
There are actually satellites co-located at the EXACT same position in
the arc, not merely the .3 degrees apart that Echostar and Anik are from
each other. I have the wide-band Pansat Ku LNB and can scan the entire
11.7 - 12.7 range that encompasses the North American Ku allocation
(actually the Pansat LNB can cover a even greater frequency range than
needed, it'll cover the Ku satellite allocations world-wide). Picking up
the lower Ku spectrum from one satellite and then the higher spectrum
from another during a scan is no big deal - just look at the lyngsat.com
listings for 72, 91 and 101, for example.

The Echostar satellite is circularly polarized (left/right) and you
probably have a linear (horizontal/vertical) dualband feedhorn so there
will be some signal loss when picking up a circularly-polarized
transmission, but if the footprint of the satellite is strong in your
area you'll still have enough signal left to work with. The only problem
is that you can't differentiate between the left and right-handed
polarities so their may be some interference from Echostar's opposite
polarity transmissions that will interfere and degrade the desired
transmission. This is known as the signal-to-noise ratio and is just as
important as the raw signal level (the desired polarity being "signal",
and the opposite polarity being "noise"). So some transponders may be
receivable and others will not because of the cross-polarity
interference. Doing a blind scan for both encrypted and FTA signals on
the DBS satellites with my Pansat 2500A will turn up some transponders
and not others, S/NR has always been my best guess for why some channels
get logged and others don't.

I have noticed that although I can get the Arkansas FTA stations from one
of the Echostars (I forget which) through the entire 360-degree rotation
of my polarizer, there are distinct peaks and nulls though the rotation.
I suspect that this is due to slight imperfections in the feedhorn design
that puts a "twist" on the signal and allows the feedhorn probe to get
slightly more in or out of phase with the circularly-polarized DBS
signals even though it's a linearly-polarized feedhorn.

 

[Guest]

Archived from groups: alt.video.satellite.mpeg-dvb (More info?)

On Mon, 10 Jan 2005 16:33:05 -0600, "Jfleeter" <jfleetwd@mycvs.net>
wrote:

>I have a C-Band system that I use with a Pansat 2500A. I use a C-band
>polorotor that also has a Ku-Band LNB. What is funny is I did a blind scan
>on the Canadian satellite located at 118.7 W.
> Using the linear Ku-Band Lnb, I was able to receive some of the programming
>on Echo 7 at 119 W. It did not matter what polarity I selected H or V. I
>could still receive about 40 channels off Echo 7. In fact the Echo 7
>satellite overpowered the Canadian E2 signal. Has anyone experienced
>anything like this before??
>


Blind scan picks up some of the DBS stuff on wrong freqs on all the
DBS birds. It freaked me out when I was scanning G-11 and a bunch of
cool channels came up.
The DBS birds are circular polarization, that is why your polarotor
has no effect.