Astra 19.2e + 28.2e with Triax flexiblock

A

ajra79

Member
My Satellite Setup
Triax TD-88 -> Triax Single offset 0,3dB LNB -> Sony Bravia KDL-V5800 triple tuner DVB-T,C,S/S2 &

Triax TD-88 -> Triax Single offset 0,3dB LNB -> QQ Box DVB-S usb receiver
My Location
Finland
Hello people

Trying (with no luck so far) to lock Astra 1 and 2 with a TD88 dish and triax flexiblock multifeed for LNBs. The multifeed should be able to handle a satellite separation of maximum 10 degrees, so in this particular case we are talking about 9 degrees separation.

At the moment I have 19.2e working nicely. I have a simple 2-1 diseq 1.0 switch. I believe 19.2e is offset since this multifeed does not allow for a central LNB. Standing behind the dish LNB 1 - 19.2e on the left and LNB 2 - 28.2e to the right.

With the help of satfinder I have moved LNB 2 along the multifeed and the satfinder finds "some signal" from somewhere, but the receiver shows no signal.

Any comments on this? is it possible that I have aligned astra 1 on the wrong side?

Thank you for your helps
 
You may not have moved it far enough and are picking up 23.5°E. Either scan for channels where it is and see if you pick up Dutch regional programming or slowly move it further away from the centre. Not sure about your dish size for picking up Astra 2 in Finland, but I'm sure someone else will advise on that. Good Luck.
 
Hi,

Suggest focusing on Astra2 or as close as, then Astra1 offset. Also possibly upgrading to a 110cm with 20° multiblock LNb holder for reliable reception of Astra2. There is a modification that can be done to get the LNb centre on the bracket as with the flexiblock.

Believe you should get the North beam with a Td 88cm based on a quick search. Also, there's not much in the elevation differences / LNb height positioning between the two satellites given your longitude.
 
Yes, try 28E at the focus with 19.2E offset. You can cut a piece out of the multiblock holder, and also slim down the LNB holder itself, to get the LNB at the centre.
 
Thank you for all the replies

The dish and flexiblock for two lnbs are both new, so i doubt about near future upgrades.

I am a little bit confused, about this mirroring of the signals. Before I had a single LNB (center) with the original triax lnb holder focused on 19.2e. After installing the multifeed, placed this lnb to the left (view from behind the dish) and lost 19.2e. I moved the dish to grab 19.2e again. Is it so that if the LNB is on the left side of the multifeed, the mirrored signal will always come from the right? not even by accident from the left?

The funny thing is that when moving the second LNB the Satmeter found signals almost all along the multifeed with the strongest signal at the very end of the multifeed arm... however the receiver did not show any signal..

I will try to find astra 2 first and keep you informed of the progress
 
ajra79 said:
. Is it so that if the LNB is on the left side of the multifeed, the mirrored signal will always come from the right? not even by accident from the left?
Click to expand...

The signal will always be mirrored. Just like hiiting the ball against the cushion in pool/snooker/billiards.
 
Not an expert but I think you are asking a lot of your current dish with a 9 degree seperation.The last time I used this type of setup was in the analogue days and the best I achieved was 6 degrees between 13 degrees and 19 degrees satellites.I would upgrade to the TD110 and reckon you will have better success specially in poor weather conditions.I stand corrected here by the experts though.
 
petediscrete said:
Not an expert but I think you are asking a lot of your current dish with a 9 degree seperation.The last time I used this type of setup was in the analogue days and the best I achieved was 6 degrees between 13 degrees and 19 degrees satellites.I would upgrade to the TD110 and reckon you will have better success specially in poor weather conditions.I stand corrected here by the experts though.
Click to expand...

Hi pete

I will take your comment into consideration as other guys have already said the same.. I will still give it a try. what still bothers me is why the satfinder shows signal all along the arm (second lnb) and the receiver shows nothing. I think there are at least 6 birds between 19.2 and 28.2 right??
 
Lyngsat gives a good idea exactly what is available along that arc of coverage at a glance.Some fairly powerful ones indeed.As an example I get BADR 26 degrees with signal strength at 71 % and quality at 50% yet the picture is perfect and its next door neighbour is hopping off the wall at 28.2 degrees Astra 2.Jokingly say the bigger the dish the more soup you get, yet the more spoons feeding from the dish the less soup everyone gets.Using a multifeed reduces the reflective ability of your dish on any particular satellite so the bigger the dish the bigger the reflective surface.A basic motorised setup without all the science could pull in all those satellites in that small arc for around the same price without all the additional cabling.
 
ajra79 said:
Hi pete

I will take your comment into consideration as other guys have already said the same.. I will still give it a try. what still bothers me is why the satfinder shows signal all along the arm (second lnb) and the receiver shows nothing. I think there are at least 6 birds between 19.2 and 28.2 right??
Click to expand...


Because satfinders are crap.They are wideband untuned devices. With the signal pattern received from each satellite along the arm, out of focus. So there is quite a bit of leeway in movement for each LNB. Using a cheapo satfinder would make it difficult to distinguish between the sats.

On a TD88, a strong satellite 9 degrees away from focus should be easily achievable.


The use of a multiblock does not reduce the reflective ability of the dish, nor does having lots of LNBs feeding from it. A bigger dish is needed though, because the LNBs on the offset are out of focus and get less signal. The middle one gets the same as if there was just one LNB. (On an offset dish)
 
ajra79 said:
Thank you for all the replies

The dish and flexiblock for two lnbs are both new, so i doubt about near future upgrades.

I am a little bit confused, about this mirroring of the signals. Before I had a single LNB (center) with the original triax lnb holder focused on 19.2e. After installing the multifeed, placed this lnb to the left (view from behind the dish) and lost 19.2e. I moved the dish to grab 19.2e again. Is it so that if the LNB is on the left side of the multifeed, the mirrored signal will always come from the right? not even by accident from the left?

The funny thing is that when moving the second LNB the Satmeter found signals almost all along the multifeed with the strongest signal at the very end of the multifeed arm... however the receiver did not show any signal..

I will try to find astra 2 first and keep you informed of the progress
Click to expand...

Why not take a browse here at this basic guide Offset LNb guide
 
satelliteman said:
Why not take a browse here at this basic guide Offset LNb guide
Click to expand...

Thank you satelliteman, I checked that pdf before posting. I think that in that explanation one LNB is placed in the middle and the other is offset. In my case, in this triax flexiblock both lnbs are placed side by side and the middle of the dish arm is empty.

One comment. I got an answer from a Triax representative. He instructed me focus the dish on 19.2. Then place both LNBs with a 5,33cm from the middle. There is a Scale in the multifeed that goes from 1 to 15.. to date I dont know if these are centimeters or degrees :confused:.

Anyway I tried that at first and no luck.. so i decided to post :D
 
Think you may need to address the weaker Astra2 signals received from an 88cm.
 
Really don't like the Triax multi-LNB brackets, much prefer a central LNB with offset arms, Raven do a nice one. Once you've decided on a central focus satellite and found it, then the others are easy.
 
Hello,

I have a triax tds88 with flxibloc and 2 lnb-s:
- one for Astra 19,2
- second for Hot Bird 13E

The alignment is like this:
- put one lnb into the center of the dish - the original one - suuport of the dish
- then align the antenna with this single lnb on 23,5 st for maximum signal - final and fine tuned
- then remove carrefully the single lnb with the plastic support from the dish
- install the flexibloc on the dish
- the two lnb-s will be in your case on the edges far left and right - in mirror configurations regarding the
2 satellites 28,2 - on the left 19,2 on the right as you watch the dish from the lnb's (front)

Here is attached my configuration 19,2 + 13

[fieldset=Admin]please upload to our server in future as is requested[/fieldset]
BR,
 

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ajra79 said:
T
One comment. I got an answer from a Triax representative. He instructed me focus the dish on 19.2. Then place both LNBs with a 5,33cm from the middle. There is a Scale in the multifeed that goes from 1 to 15..
Click to expand...

See what you get on the transponders you want with both satellites at focus in turn. Then you can bias the LNBs in favour of the weakest. Depends where you are in Finland I would suspect.
 
Hi guys

I've been away on holidays so i havent had the time to play around the issue...

As a comment, I got the idea of why some guys have said that with this dish size Astra 28.2 is hard to get. Well Yes, I was interested mostly on 2d which has the most interesting FTA channel list. Unfortunately, in my location I would need a very large dish (at least 2m or so) to even get some of the south beam channels on 2d :-cry1. 2A is just Sky and 2b well, i dont know...

Anyway, Eurobird 1 might be an alternative right?, If at the end of the day i cant get this to work, i might stay cool with 19.2e and 13e. So does Eurobird 1 worth the effort?
 
The footprint differs to that of Astra2.

_http://flysat.com/ebird1-beam.php
 
I have spent three days trying to get 13e & 28.2e on a TD88 with the Triax Multiblock, which takes up to 4 lnbs. What a palaver. The setting given by Triax for lnb spacing just don't work, well not in the NW of Ireland. Had to figure out my own spacing, but it is a real compromise between the two sats. Hotbird is reall difficult offset...never again!
You have my fullest sympathy.
 
Those two sats are usually very easy to get on a TD88.Could be your location of course. Not really looked at the leaflet, I always do them by figuring out my own spacing and a bit of trial and error.

Doesn't look to be much of a slope on the multi-arm , did you tilt it?
 
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