NSS5 = tried again but failed

[Vipersan]

Hi friends ..
According to lyngsat a broadcast (non feed) channel has started on the NSS 5 bird @20west..
Up to now this satellite has remained relatively inactive ..
..one could almost call it a cosmetic addition to the fleet..

today I noticed this channel had reportedly appeared :-
4159 L
tp 88 Emmanuel TV DVB-S2
MPEG-2 3034-1/2
QPSK
34 33 E
Global

No ..its not what you might expect ...witha name like Emmanuel ..
;)
...I thought since it was on the Global beam ...just maybe I could finally pinpoint this ultra quiet bird ..
Sadly not a whisper...
Checking the eirp and footprint I'm not surprised ..
If my calcs are correct ...a dish over 3m ...possibly 4m ...would be neccessary ..even with the 1/2 fec..
Just curious if anyone in the UK can get a sniff of this bird ..
...or maybe even a report from our North European Cbandit brethren..
rgds
VS

 

[Lazarus]

Can't win 'em all, VS - though it seems you are going to have a darned good try!

 

[Vipersan]

Can't win 'em all, VS - though it seems you are going to have a darned good try!

LOL...
I'll always git it a go Gordon...
Better to have tried and failed ..etc ...etc..
;)

 

[Huevos]

I was setting up my C-band stuff yesterday and with the meter connected did a sweep of the arc and noted the v-box number for each position that showed signal and this was one of them. I didn't try to lock anything though as I was just trying to work out my DiSEqC 1.2 points.

 

[Vipersan]

Thanks for the report Huevos ..
I suspect where I am in the UK leaves me outside the beams useful footprint ..
rgds
VS

 

[Vipersan]

Hmmm ..
starting to worry if I have adjusted something which has thrown me wayyy out ..even though nothing has changed at the extreme west of the arc...

It appears I can no longer pull AFN (pentagon channel ) at 1West ...although ERTU and BBC still booming in ..
before I start tweaking ..can someone please confirm that AFN is still there and not gone off air..
most odd and frustrating..
rgds
VS

 

[nelson_b]

hi -
its still there its a bit weak tonight --
but that may be the dielectric plate position on my setup i always have to get a balance between the ERTU channels and the AFN -- one likes the plate further in --
the other further out -- i,m using a standard plate at the moment

regards nelson.b.

 

[Vipersan]

Thanks Nelson ...
As you say AFN has always been a bit tricky ...
It may well return once I get the lnbf set up and optimised ..
I had it no problem on Saturday ...but the head assembly has been on and off a few times since then ..
I suspect its to do with choke /lnbf focal point positioning ...
but I'm not going to persue it until I get those springs for fine adjustment.
I've had neither a yes or no from my 'nephew' as yet..
cheers for checking buddy ..
appreciated.
VS

 

[nelson_b]

ok -

i,v just found out that i can recreate the effect that moving the plate in or out --
to get a balance between the ERTU channels and the AFN --
can be acheived by moving the dish position east or west a fraction ?????
is this a curiosity of using a offset dish for circular transmissions or what - l.o.l.

regards nelson.b

 

[Huevos]

Which way round is the delay plate? Is it horizontal or vertical?

 

[nelson_b]

Which way round is the delay plate? Is it horizontal or vertical?

hi Huevos -
here is a picture of how it sits at the moment --

regards nelson.b

 

[Huevos]

here is a picture of how it sits at the moment

Looks like the same feedhorn I've got. Mine is vertical (when the dish is due south) not that it matters. Anyway reason I asked was I was just trying to visualise the effect.

 

[nelson_b]

that is the best position for me for linear signals without the plate

i,m just getting used to this - BSC 421 i,m pleased with results -- best so far --

this is the 4th C band l.n.b iv had on this 1.8 offset dish --and the have all had quite different characteristics ---- i,v used the blue feedhorn on all of them
the others were a DMX 741 c and k/u/ combined unit ( the C band was ok the ku performance was not )
a pauxis 900a -- this was better than the DMX -- good all round results --
and a second hand--- chapparal co rotor -- this surprised me as it was as good as the pauxis -- i put this down to the fact that it could be precisely fine tuned by altering the position of the recieving probe in relation to the dielectric plate -- different satellites required different settings in this respect -- there seems to be a lot to learn with C band --
i,v had good fun messing about so far -- and i hope lots more to come ---

regards nelson.b

 

[Vipersan]

Hi Nelson ...
may I just interrupt the thread to let you know ...
looks like I'm needing to take you up on your offer of three of those springs ..
Nephew has just phoned to say ..he can't help as they don't have any where he works ...
So ..
can you please PM me about them ..
I assume you still have my address etc ...but i case you don't.etc..
Thanks again m8
VS

 

[Channel Hopper]

Nephew has just phoned to say ..he can't help as they don't have any where he works ...
So ..

He must have, it's the first thing that is replaced by (most) brake specialists as hey are prone to rust / slipping off the retaining pin if worn.

If it's of help the VW cars of the 80's and early 90's used a smaller spring than the Ford one mentioned in the other thread, though I may only have two (of course) lying around.

Just a thought - what about the internals of a bog standard - non gypsy - clothes peg ?

 

[pride21]

hi nelson_b i get the same thing as you with satellites on my offset a tweak to the left or right often brings in the channel stronger i thought is was my dish i am glad i am not the only one.

 

[Vipersan]

Hi m8's ...
not sure if this anomaly is confined to offset dishes...
Since I built the new tripod and more accurately centered the lnbf ..
I've totally lost AFN..
but everything else ..not just on 1W ...but 90% of channels accross the arc are being received at stronger signal levels ..
So is there something odd about the AFN transmissions ?? ...I'm beginning to think there is...
and that the best reception for AFN my PF dish _was_ to be had when the feed is offset ...
..ie ..some sort of weird 'side lobe' reception thing..
??
most confusing after all the hard work I've put in ..
rgds
VS

 

[nelson_b]

hi nelson_b i get the same thing as you with satellites on my offset a tweak to the left or right often brings in the channel stronger i thought is was my dish i am glad i am not the only one.

hi -pride21-
thanks for confirming that --its not noticable on stronger sat/ transponders
just when you start tuning the very weak ones --

@ Vipersan -- yes the AFN transponder seems to be the odd one out at 1 west -- i just get 3 t.p.,s at 1 west -- do you get more ?

i thought also that it was just confined to circular signals
but when i was trying to fine tune a new BSC 421 l.n.b for linear - yesterday on 58 west --
i noticed again on the extremely weak signals that i was getting the same thing and needing to fine tune the position between H or V transponders ??

regards nelson.b.

 

[Vipersan]

@ Nelson ..
Like you I only got 3 transponders at 1 west
BBC on the east beam ..and ERTU and AFN on global ..
but since AFN has vanished for me ...if down to 2 .....but these 2 are now stronger ..
It looks for all the world like the more acurate my dish ....the poorer my reception of AFN on the global beam ..
definately odd..
I have noticed quite a few c band birds which seem to have 2 peak points seperated by a couple of degrees ..NSS806 at 40W is one ..where a cluster of channels improve greatly by moving a degree or so to the west ..

Intel905 @24.5 west is another where I get 2 peaks ..ORTM is on one peak ..and RTB is on the other..
I think you have commented on this one before..
rgds
VS

 

[Vipersan]

Hmmm..
This oddity relating to global beams and having to slightly shift the dish left or right to maximise the signal is bugging me ..
I have a theory which is probably nonsense ..but here goes ..
If a global beam isn't actualy comprised of one cental antena ...but in fact 2 ...beams from 2 antenae aimed to the left and right beams ie West and East fucused by reflectors at the satellite itself...
..then its possible ..I'm summising ..that there is an overlap in the central area ..
If you place your dish/receiver under the beam of this overlap area ...
and its reasonably accurate and set up correctly ..
Is it possible the more acurate it is that 2 received beams carrying the same broadcast _could_ have a wave cancelling effect ...thus creating a null point ...aor at least greatly reduced point..??
My idea is that ..if you where to tilt your dish obliquely ..even slightly... at these 2 received beams ...
Could you find a point the the left or to the right of centre ...where the 2 beams/waves amplified the signal due to wave addition as opposed to subtraction ..??
ie ..in phase as opposed to out of phase ..?

As I said its just a theory ...and I do not know if a centralised global beam comprises 2 ( lobes) or hemispherical beams ..
..and more difficult to imagine with circular polarisation than H & V..
..but certainly there is something odd going on here ..
feel free to shoot me down in flames ..
..but at least a discussion however silly ..might just uncover the truth..
rgds
VS