SpaceX Eutelsat 36D

[nelson_b]

>> "Still puzzled why some transponders - (11995 being one of them) - are showing signal on both LHC and RHC" <<
I don't see that here Nelson
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Indeed ..... thanks for that ..... i have this odd result on quite a few transponders .....
11996 has weakened here now in the last hour and is no longer locking - but looking at it now on the F15 with V polarisation selected it shows 7.5 db .. with H selected it shows 7.1 db

The new transponder 11977 i had locked earlier this evening was "locking" in either polarity one at 8.0 db and the other at 8.5db .. ?

There are other transponders that don,t do this ... and just show signal and lock or not in only one polarity ...
I will try and make a list of both examples tomorrow if the signal is good again ..... i cant see any sensible pattern to this oddity so far ... cant recall having had anything like this on the F15 in C band.

 

[John]

Indeed ..... thanks for that ..... i have this odd result on quite a few transponders .....
11996 has weakened here now in the last hour and is no longer locking - but looking at it now on the F15 with V polarisation selected it shows 7.5 db .. with H selected it shows 7.1 db

The new transponder 11977 i had locked earlier this evening was "locking" in either polarity one at 8.0 db and the other at 8.5db .. ?

There are other transponders that don,t do this ... and just show signal and lock or not in only one polarity ...
I will try and make a list of both examples tomorrow if the signal is good again ..... i cant see any sensible pattern to this oddity so far ... cant recall having had anything like this on the F15 in C band.

I get the same polarity issue that you describe sometimes Nelson but it's down to my error with various receivers thats running at the same time ie: Computer with CS or EBSPro / Promax meter / GTX Combo feeding into my signal distribution system with different lnb output voltages set running on the things.
I'd be interested in the list you want to make of the problem signals so i can do a comparison for you at my end to pin point the cause.

 

[nelson_b]

I get the same polarity issue that you describe sometimes Nelson but it's down to my error with various receivers thats running at the same time ie: Computer with CS or EBSPro / Promax meter / GTX Combo feeding into my signal distribution system with different lnb output voltages set running on the things.
I'd be interested in the list you want to make of the problem signals so i can do a comparison for you at my end to pin point the cause.

Thanks - john .. I will compile a list when i can, .... probably not today though - currently the weather is so dreadful here i can see very little signal from any transponders on this sat at the moment. May need to lock down the dish if the wind increases as is forecast.
I will also eliminate indirect connections to other equipment , i,m using two outlets from a C120 Invacom quad l.n.b on the 2.4 c.m. - one feed directly to the F15 ... and the other to one of the inputs of a 8 way diseqc switch which is connected to a number of other dish,s / l.n.b,s .... to feed into my V7 S - GT Media receiver .
It would be interesting to solve the puzzle ...

 

[John]

Thanks - john .. I will compile a list when i can, .... probably not today though - currently the weather is so dreadful here i can see very little signal from any transponders on this sat at the moment. May need to lock down the dish if the wind increases as is forecast.
I will also eliminate indirect connections to other equipment , i,m using two outlets from a C120 Invacom quad l.n.b on the 2.4 c.m. - one feed directly to the F15 ... and the other to one of the inputs of a 8 way diseqc switch which is connected to a number of other dish,s / l.n.b,s .... to feed into my V7 S - GT Media receiver .
It would be interesting to solve the puzzle ...

The wind gusts are getting up to around 45mph at the moment here and are said to be around for most of the day so think i'll be locking down soon

 

[nelson_b]

The wind gusts are getting up to around 45mph at the moment here and are said to be around for most of the day so think i'll be locking down soon

Afternoon - @John - It was a rough here around midnight last night .....

O.k .. Only one feed from my quad l.n.b. now ... straight into the F15 .. no cable joins or switches .. the puzzle is still here ?
Out of 12 transponders that are showing some degree of signal at this moment in time - 3 are showing signal in both polarities ?

11881 L is showing 5.8 db in H polarity and 4.9 db in V polarity

12034 L is showing 7.2 db in H polarity and 8.0 db in V polarity and as i type this has just locked despite being listed on flysat as LHC

12054 R is showing 6.8 db in H polarity and 8.3 d.b in V polarity with a good steady lock

The other 9 transponders are behaving normally and just showing signal in one polarity

Signal is pretty good here this afternoon and the strongest signal i get is from 12149 L /H and is currently hovering around 10.4 db.

 

[John]

Afternoon - @John - It was a rough here around midnight last night .....

O.k .. Only one feed from my quad l.n.b. now ... straight into the F15 .. no cable joins or switches .. the puzzle is still here ?
Out of 12 transponders that are showing some degree of signal at this moment in time - 3 are showing signal in both polarities ?

11881 L is showing 5.8 db in H polarity and 4.9 db in V polarity

12034 L is showing 7.2 db in H polarity and 8.0 db in V polarity and as i type this has just locked despite being listed on flysat as LHC

12054 R is showing 6.8 db in H polarity and 8.3 d.b in V polarity with a good steady lock

The other 9 transponders are behaving normally and just showing signal in one polarity

Signal is pretty good here this afternoon and the strongest signal i get is from 12149 L /H and is currently hovering around 10.4 db.

Interesting, i'll have a look through the list now - i'll be back

 

[Captain Jack]

11881 L is showing 5.8 db in H polarity and 4.9 db in V polarity

12034 L is showing 7.2 db in H polarity and 8.0 db in V polarity and as i type this has just locked despite being listed on flysat as LHC

12054 R is showing 6.8 db in H polarity and 8.3 d.b in V polarity with a good steady lock

The only thing I can think if that you are getting remnants of linear signals from South Africa DSTV beam. A while back, I was able to lock 12054H transponder from DSTV. I don't know about now as I have neighbour's trees in the line of sight to big parts of the east and 36E is in the middle of these bushes.

 

[nelson_b]

The only thing I can think if that you are getting remnants of linear signals from South Africa DSTV beam. A while back, I was able to lock 12054H transponder from DSTV. I don't know about now as I have neighbour's trees in the line of sight to big parts of the east and 36E is in the middle of these bushes.

It could well be that ? ... i will try skewing the l.n.b on those frequencies later ... that should maybe reduce or eliminate any linear .. whilst retaining most of the circular signal ?

 

[John]

Afternoon - @John - It was a rough here around midnight last night .....

O.k .. Only one feed from my quad l.n.b. now ... straight into the F15 .. no cable joins or switches .. the puzzle is still here ?
Out of 12 transponders that are showing some degree of signal at this moment in time - 3 are showing signal in both polarities ?

11881 L is showing 5.8 db in H polarity and 4.9 db in V polarity

12034 L is showing 7.2 db in H polarity and 8.0 db in V polarity and as i type this has just locked despite being listed on flysat as LHC

12054 R is showing 6.8 db in H polarity and 8.3 d.b in V polarity with a good steady lock

The other 9 transponders are behaving normally and just showing signal in one polarity

Signal is pretty good here this afternoon and the strongest signal i get is from 12149 L /H and is currently hovering around 10.4 db.

Reception here at the moment 5.15pm UK is a bit overcast to the South and the sun has just broke through from the West - signals from 36D have not been the best today for me, especially morning time up till mid afternoon
Here's a quick CS grab showing the three problem frequencies, no sign of signals on the opposite circ polarity on the three problem ones.
What's the H / V probe alignment to each other like within the lnb, are they sitting nicely at 90° to each other etc ?
Is the plate sitting at 45° for the probes etc so as not to cause a bit of cross pol ?

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[John]

Reception here at the moment 5.15pm UK is a bit overcast to the South and the sun has just broke through from the West - signals from 36D have not been the best today for me, especially morning time up till mid afternoon
Here's a quick CS grab showing the three problem frequencies, no sign of signals on the opposite circ polarity on the three problem ones.
What's the H / V probe alignment to each other like within the lnb, are they sitting nicely at 90° to each other etc ?
Is the plate sitting at 45° for the probes etc so as not to cause a bit of cross pol ?

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Just seen your post CJ , i cant see any reference anywhere , Lyngsat / Flysat, that shows Africa beams on those three problem frequencies - am i looking in the wrong place
**Correction - i can see 12.054 H is on the Africa beam

 

[nelson_b]

Reception here at the moment 5.15pm UK is a bit overcast to the South and the sun has just broke through from the West - signals from 36D have not been the best today for me, especially morning time up till mid afternoon
Here's a quick CS grab showing the three problem frequencies, no sign of signals on the opposite circ polarity on the three problem ones.
What's the H / V probe alignment to each other like within the lnb, are they sitting nicely at 90° to each other etc ?
Is the plate sitting at 45° for the probes etc so as not to cause a bit of cross pol ?

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View attachment 158259

Thank you john ... indeed the puzzle continues ... the probes in the l.n.b. looked good when i split it from the feed to insert a plate ( i dont want to remove the sealed cap on the feed ) and yes i was very careful to set the plate in relation to the probes .
i just - out of interest skewed the whole l.n.b. and feed assembly by 45 degrees to see if it made any difference to the problem frequencies ... but i could not see any notable difference .. it slightly reduced the signal on a couple of the weaker non problem ones.
My next move when i get the time ... is to swap the l.n.b. - i have spare Invacom quad, and Ivacom single C120,s and also an Inverto. one .

That i lock any circular k/u frequencies from well outside official footprint is - i think - pretty remarkable, even with a large 2.4 dish .... to have to check both polarities is not much of an issue to be honest .. just a puzzle why it occurs on just a small number of the frequencies . Never had this issue with any circular transponders in C band on the F15 receiver.

My ambition over the weekend was to lock something FTA that i could view from these Russian transponders .. i succeeded i guess, but a little disappointed that it was only a - testcard - and three shopping channels

 

[John]

Thank you john ... indeed the puzzle continues ... the probes in the l.n.b. looked good when i split it from the feed to insert a plate ( i dont want to remove the sealed cap on the feed ) and yes i was very careful to set the plate in relation to the probes .
i just - out of interest skewed the whole l.n.b. and feed assembly by 45 degrees to see if it made any difference to the problem frequencies ... but i could not see any notable difference .. it slightly reduced the signal on a couple of the weaker non problem ones.
My next move when i get the time ... is to swap the l.n.b. - i have spare Invacom quad, and Ivacom single C120,s and also an Inverto. one .

That i lock any circular k/u frequencies from well outside official footprint is - i think - pretty remarkable, even with a large 2.4 dish .... to have to check both polarities is not much of an issue to be honest .. just a puzzle why it occurs on just a small number of the frequencies . Never had this issue with any circular transponders in C band on the F15 receiver.

My ambition over the weekend was to lock something FTA that i could view from these Russian transponders .. i succeeded i guess, but a little disappointed that it was only a - testcard - and three shopping channels

Ok no worries, using 12.149 L as a test frequency i replicated a similar looking 13v/18v L/R CS scan picture where it looked like or very similar to your problem pictures - i acheived that by taking the Circ pol lnbf very slightly off boresight. Didn't do anymore as got diverted to wifey duties.

 

[nelson_b]

Ok no worries, using 12.149 L as a test frequency i replicated a similar looking 13v/18v L/R CS scan picture where it looked like or very similar to your problem pictures - i acheived that by taking the Circ pol lnbf very slightly off boresight. Didn't do anymore as got diverted to wifey duties.

Thanks John ... That,s very interesting

I also discovered something a short while ago ... i managed finally to get a scan fom both polarity,s on 12034 .. and lo and behold it brought in a different set of channels from each polarity ... will take pics and post later , as busy for the next hour or so.

 

[John]

Thanks John ... That,s very interesting

I also discovered something a short while ago ... i managed finally to get a scan fom both polarity,s on 12034 .. and lo and behold it brought in a different set of channels from each polarity ... will take pics and post later , as busy for the next hour or so.

Well somethings working well at your end Nelson, for me there's absolutely no sign at all on the Promax screen for 12.034 V & 12.054 H on the Africa beams.

 

[nelson_b]

Well somethings working well at your end Nelson, for me there's absolutely no sign at all on the Promax screen for 12.034 V & 12.054 H on the Africa beams.

It might be working well John .. But the scan listings are a not as they should be ! Its taking me a little time to get my head around the results .... Maybe the plate has moved when assembling and fitting or maybe i just didn't set it accurate enough .... i will try to explain ... when i scan 12034 V or 12054 V or 12073 V i get the UHD and 4K channel list that according to Flysat are on 12054 R
When i finally got a lock on 12034 H - ( and its the only one of the three that would lock in H as well as V) it brought up what i suspect is the proper channell list for 12034 H ? (7 Channels - 6 of them are shown on the pic below ) ... although they are listed on my receiver as Trikolor it does not tally with Flysats listings ?? ... maybe the list is out of date? i cant find them on Flysat

This puzzle is getting complex

 

[danny10]

channels are OK, write changed to Flysat..

 

[Captain Jack]

Just seen your post CJ , i cant see any reference anywhere , Lyngsat / Flysat, that shows Africa beams on those three problem frequencies - am i looking in the wrong place
**Correction - i can see 12.054 H is on the Africa beam

There's frequency reuse on all of the problem frequencies according to both Lyngsat and Flysat.

 

[John]

There's frequency reuse on all of the problem frequencies according to both Lyngsat and Flysat.

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Yep, i noticed my dumb mistake after i posted CJ - i highlighted just the 36D listings which missed the complete info available if i had selected just the '36°' option.

 

[Captain Jack]

Meanwhile, the trees mean that I can barely lock the Eurasian beam, let alone SA/Russian.... Grrr

 

[nelson_b]

Thanks folks ... I guess frequency share disruption " is" the most likely cause .. i will continue to experiment - as and when i get the time ... other things take priority for most of the day today.

regards ...