AMC16 Linear or Circular?

C

Clancy

Thread Starter
SatelliteGuys Pro
Apr 3, 2006
436
0
I know it has been established here that AMC16 at 118.75 is operating in the FSS band with a circular polarity.

I am wondering if at the moment it is transmitting both linear and circular signals.

What makes me wonder is the following quote from a DBS Talk poster.

With my 30" dish with linear LNB, I 'm getting a channel "TV 9903" off transponders 11.840V and 11.839H. It shows "Congratulations! You have a DISH PLus." with music.
Is it from 119 or from 118.7?

[Also, I tried to connect my 301 receiver to this cable, and it does not show anything, only coolsat does] end of quote.

Anyone here that can talk with an insider at Dishnetwork?
 
M

Mr Tony

SatelliteGuys Pro
Supporting Founder
Nov 17, 2003
378
109
Mankato, MN
Clancy
it does work with a linear LNB but it is very low signal. I was able to get the "you have a DishPLus" with a linear LNB...although at a 20 quality (30 is normally standard to be stable picture on a FTA box)

It is possible to use the wrong tyope of LNB in some cases, but the signal is low or non-existant
 
SatAdam

SatAdam

SatelliteGuys Pro
May 2, 2006
261
0
I got it with a linear with about a 40 signal this morning, couldn't hit it again to save my life.

Circular doesn't get it at all. (I did not move the dish, using invacom quad.)

That "You have a Dish Plus" page was pretty. Now I'm done with that. Time for another toy :) I think I am going to wonder to the PC card forum.......
 
P

photoman76

SatelliteGuys Pro
Jan 8, 2005
3,291
1
SatAdam said:
I got it with a linear with about a 40 signal this morning, couldn't hit it again to save my life.

Circular doesn't get it at all. (I did not move the dish, using invacom quad.)

That "You have a Dish Plus" page was pretty. Now I'm done with that. Time for another toy :) I think I am going to wonder to the PC card forum.......


I'm not surprised that you can't get it with the invacom quad circular. The frequency 11840R is way lower than the specs for the invacom lnbf. I can't tune it with my circular dbs lnbf. But I can see it with a linear lnbf. It all depends on how strong the signal is in your area and how well your linear lnbf rejects adjacent signals.
 
C

Clancy

Thread Starter
SatelliteGuys Pro
Apr 3, 2006
436
0
Iceberg said:
Clancy
it does work with a linear LNB but it is very low signal. I was able to get the "you have a DishPLus" with a linear LNB...although at a 20 quality (30 is normally standard to be stable picture on a FTA box)

It is possible to use the wrong tyope of LNB in some cases, but the signal is low or non-existant

Thanks for the reply.
I have a couple of old Star Choice LNBF's operating on the required FSS band, their frequency drift is pretty good so when I get time I might hook them up to some spare dishes. I will be able to test as high as a 10'.
 
L

larrystotler

SatelliteGuys Pro
Jun 5, 2004
591
0
Winchester, VA
Correct - A DBS LNB will not pick up those signals(maybe the highest ones). Further, AFAIK, you can't transmit both H/V and circular at the same time. It doesn't work that way.
 
S

Smith P.

On Vacation
Oct 4, 2003
8,907
1
Bay Area, CA
Please read notes to that pictures - DBS LNBF will pick up those transponder ( actually did and do ), a problem is the IF : 450...950 MHz - out of input range of all receivers and cards.
 
P

photoman76

SatelliteGuys Pro
Jan 8, 2005
3,291
1
Smith said:
Please read notes to that pictures - DBS LNBF will pick up those transponder ( actually did and do ), a problem is the IF : 450...950 MHz - out of input range of all receivers and cards.


Ok, I now understand what you are saying. The problem isn't my circular lnbf, but the fact that my Broadlogic card will only tune down to IF 775MHz. That's why I'm seeing the higher frequencies, but not the lower ones.
 
S

Smith P.

On Vacation
Oct 4, 2003
8,907
1
Bay Area, CA
right, if you'll find a way to decrease LOF in your LNBF to 10.75 GHz, then all transponders will be seen
 
P

photoman76

SatelliteGuys Pro
Jan 8, 2005
3,291
1
Smith said:
right, if you'll find a way to decrease LOF in your LNBF to 10.75 GHz, then all transponders will be seen

Another option is to attach a dielectric plate at 45 degree angle on the end of the linear lnbf. For the dielectric plate, I cut a small piece from a poly cutting board and taped it to the end of the linear lnbf. It cleaned up the Broadlogic Spectrum analyzer plot quite nicely.
 

Attachments

  • AMC16 Left.jpg
    AMC16 Left.jpg
    37.8 KB · Views: 190
S

Smith P.

On Vacation
Oct 4, 2003
8,907
1
Bay Area, CA
I see you're using universal LNBF now.
Yes, that's well known method converting linear to circular LNBF. Unfortunately it can't be used for regular Dish receivers due to lower LOF.

Your snapshots looks familiar for me - are you that guy who make the Broadlogic board working as SA ?
 
P

photoman76

SatelliteGuys Pro
Jan 8, 2005
3,291
1
Smith said:
I see you're using universal LNBF now.
Yes, that's well known method converting linear to circular LNBF. Unfortunately it can't be used for regular Dish receivers due to lower LOF.

Your snapshots looks familiar for me - are you that guy who make the Broadlogic board working as SA ?

Yes, I posted some over in FTA section.
 
DK_Sat

DK_Sat

SatelliteGuys Pro
Dec 11, 2005
572
14
MD
Photoman,

Can you post a photo image off the LNBF with the dielectric plate

Thanks,
 
P

photoman76

SatelliteGuys Pro
Jan 8, 2005
3,291
1
DK_Sat said:
Photoman,

Can you post a photo image off the LNBF with the dielectric plate

Thanks,

I already removed it from the lnbf mounted on my dish. But here are a couple of shots showing what it looks like on a spare lnbf that I have.
 

Attachments

  • Linear to Circular LNBF 1.jpg
    Linear to Circular LNBF 1.jpg
    8.8 KB · Views: 248
  • Linear to Circular LNBF 2.jpg
    Linear to Circular LNBF 2.jpg
    8.5 KB · Views: 216

Similar threads

C
Replies
11
Views
1K
Capt Odyssea
C
bookworm370
Replies
12
Views
389
Josephinelcajon
Josephinelcajon
M
Replies
39
Views
3K
MikeD-C05
MikeD-C05
JeffN9
Replies
11
Views
748
tpribors
T

Users Who Are Viewing This Thread (Total: 0, Members: 0, Guests: 0)

Latest posts

Top