Santa has delivered a wave frontier T90 dish.... I now have someimportant choices to make.....

R. Mark Clayton wrote:

compensate for the weight of the dish and LNB's when aligning the pole
(which MUST be vertical +/- 0).

For a steerable. Not otherwise.

Bill

On 30/12/2013 08:53, Stephen wrote:

Its on page 4 of http://www.wavefrontier.us/materials/T55P.pdf and heres
a pic of one on a wall.

http://www.satellites.co.uk/forums/a...242-jpg.42732/

As you can see it looks rather flimsy for a T90 dish that has two
reflectors so much higher wind loading factor than a single reflector
dish. I tend to use two K brackets for my poles.

The weaknesses I see is that the side arms look like they are made of
thin pieces of pipe with flattened ends so will bend easily. The pole
has a nut and bolt at the bottom connecting it to the wall bracket.

And the wieght of up to 16 Quattro LNB's and associated cabling....


If you make your own arrangements don't forget that the T90 needs a 60mm
diameter pole!


--
Michael Chare

On 30/12/2013 22:28, Michael Chare wrote:
On 30/12/2013 08:53, Stephen wrote:

Its on page 4 of http://www.wavefrontier.us/materials/T55P.pdf and heres
a pic of one on a wall.

http://www.satellites.co.uk/forums/a...242-jpg.42732/

As you can see it looks rather flimsy for a T90 dish that has two
reflectors so much higher wind loading factor than a single reflector
dish. I tend to use two K brackets for my poles.

The weaknesses I see is that the side arms look like they are made of
thin pieces of pipe with flattened ends so will bend easily. The pole
has a nut and bolt at the bottom connecting it to the wall bracket.

And the wieght of up to 16 Quattro LNB's and associated cabling....


If you make your own arrangements don't forget that the T90 needs a 60mm
diameter pole!


i knew that anyway.... SO do you have a Wavefrontier T90 too then?

"Bill Wright" wrote in message
...
R. Mark Clayton wrote:

compensate for the weight of the dish and LNB's when aligning the pole
(which MUST be vertical +/- 0).

For a steerable. Not otherwise.

Bill

With multiple LNB's over a widish arc, the pole will need to be pretty well
aligned (but not as fine as for my 1.2m Fibo Gregorian)

R. Mark Clayton wrote:
"Bill Wright" wrote in message
...
R. Mark Clayton wrote:

compensate for the weight of the dish and LNB's when aligning the pole
(which MUST be vertical +/- 0).
For a steerable. Not otherwise.

Bill

With multiple LNB's over a widish arc, the pole will need to be pretty well
aligned (but not as fine as for my 1.2m Fibo Gregorian)



No, you simply position the LNBs (up and down) optimally. If the
reflector is slightly non-vertical it doesn't matter. Obviously physical
fixings are easier if the thing is properly upright, but it can be made
to work even if the reflector is on a bit of a tilt.

Bill

On 30/12/2013 23:27, Stephen wrote:
On 30/12/2013 22:28, Michael Chare wrote:
On 30/12/2013 08:53, Stephen wrote:

Its on page 4 of http://www.wavefrontier.us/materials/T55P.pdf and heres
a pic of one on a wall.

http://www.satellites.co.uk/forums/a...242-jpg.42732/

As you can see it looks rather flimsy for a T90 dish that has two
reflectors so much higher wind loading factor than a single reflector
dish. I tend to use two K brackets for my poles.

The weaknesses I see is that the side arms look like they are made of
thin pieces of pipe with flattened ends so will bend easily. The pole
has a nut and bolt at the bottom connecting it to the wall bracket.

And the wieght of up to 16 Quattro LNB's and associated cabling....


If you make your own arrangements don't forget that the T90 needs a 60mm
diameter pole!


i knew that anyway.... SO do you have a Wavefrontier T90 too then?

Yes, it is mounted on scaffolding in my garden, so that it can see over
various trees. A squirrel (or other animal) gnawed some of the LNB
holders.

--
Michael Chare

So how many LNBs have you got on you t90 and on what sat positions?

What type of LNBs are you using?

On 31/12/2013 21:18, wrote:
So how many LNBs have you got on you t90 and on what sat positions?

What type of LNBs are you using?


There are five quad LNBs for 28.2e 19.2e 13e 9e and 5w

MTI AK54-XT2
MTI AK54-XT2BL
Lemon Lemp-40QDL
Technomate TM-4 - old
Technomate TM-4 - newer

The MTI LNBs have never been any trouble

I had a Smart Titanium LNB that died. It did not like switching polarity
- needed lots of current

There was one transponder that the older Technomate LNB would not
receive. The new one did not have this problem.

I also have a motorised dish with an Inverto Black Ultra LNB

I have 4 EMP-Centauri Diseqc 1.1 switches connected to two twin tuner
linux receivers.


--
Michael Chare

On 01/01/2014 01:25, Michael Chare wrote:
On 31/12/2013 21:18, wrote:
So how many LNBs have you got on you t90 and on what sat positions?

What type of LNBs are you using?


There are five quad LNBs for 28.2e 19.2e 13e 9e and 5w

MTI AK54-XT2
MTI AK54-XT2BL
Lemon Lemp-40QDL
Technomate TM-4 - old
Technomate TM-4 - newer

The MTI LNBs have never been any trouble

I had a Smart Titanium LNB that died. It did not like switching polarity
- needed lots of current

There was one transponder that the older Technomate LNB would not
receive. The new one did not have this problem.

I also have a motorised dish with an Inverto Black Ultra LNB

I have 4 EMP-Centauri Diseqc 1.1 switches connected to two twin tuner
linux receivers.



I note you have 5 Quad LNBs and 4 off 4 port diseqc switches.... Am I
right that the 28.2E LNB is ponly used for sky & freesat boxes rather
than fed into the Twin tuners?

As you know, the T90 is capable of a 40 degree spread.

As my extreme limits of sat choices are 28.2 East and 30 West, thats a
difference of 58.2 degrees which is in excess of 40 degrees supported by
the T90.

I know there are examples on the net where people have extended the
T90's rail. That would probably work if I was not using Quattro LNB's on
a multiswitches. For Quattro & multiswitch use, its recommended to
increase the dish size up to the next dish size.

Thats why I am considering a 80 cm fixed dish for 28.2 E for all the
freesat & sky boxes only. A 1m fixed dish at 30 West with a 20 degree
Multi LNB holder.

As I'm interested in Astra 3 at 23.5E, adding on the 40 degrees to Astra
3 takes me to 16.5 West which is conveniently just past Telstar at 15W
which also is a fairly loud bird.

The T90's dish gain is not constant across the 40 degree arc, it is more
of a parabola, so the extreme sats need to be stronger than the middle
sats so hopefully the sat signal strengths will be fairly uniform across
the 40 degree arc. This works out quite well as Thor & Sirius, 9/10 E,
7.0E and 16.0E will be fairly near the middle portion of the T90's arc
and these are weaker.

Coming back to the fixed 1m dish on Hispasat, as mentioned earlier this
has a multi LNB holder, I can then access sats across an arc of either

(a) Intelsat 901 at 18.0 West to NSS 10 at 37.5W (which includes hispasat)
(b) Hispasat 30 West to 45.0 West.

I suspect the intervening local terrain, satellte signal strengths and
low numbers of Ku band transponders will defeat me somewhat over this
extreme west part of the sky will probably limit me to Intelsat 901 at
18.0 West, NSS 7 at 22.0W, Intelsat 905 at 24.5W and Hispasat at 30.0W.

On 01/01/2014 09:39, Stephen wrote:
On 01/01/2014 01:25, Michael Chare wrote:
On 31/12/2013 21:18, wrote:
So how many LNBs have you got on you t90 and on what sat positions?

What type of LNBs are you using?


There are five quad LNBs for 28.2e 19.2e 13e 9e and 5w

MTI AK54-XT2
MTI AK54-XT2BL
Lemon Lemp-40QDL
Technomate TM-4 - old
Technomate TM-4 - newer

The MTI LNBs have never been any trouble

I had a Smart Titanium LNB that died. It did not like switching polarity
- needed lots of current

There was one transponder that the older Technomate LNB would not
receive. The new one did not have this problem.

I also have a motorised dish with an Inverto Black Ultra LNB

I have 4 EMP-Centauri Diseqc 1.1 switches connected to two twin tuner
linux receivers.



I note you have 5 Quad LNBs and 4 off 4 port diseqc switches.... Am I
right that the 28.2E LNB is ponly used for sky & freesat boxes rather
than fed into the Twin tuners?


The Diseqc 1.1 switches are 8 port so all LNBs are connected. My
motorised dish is connected to one of the ports.


As you know, the T90 is capable of a 40 degree spread.

As my extreme limits of sat choices are 28.2 East and 30 West, thats a
difference of 58.2 degrees which is in excess of 40 degrees supported by
the T90.


I know there are examples on the net where people have extended the
T90's rail. That would probably work if I was not using Quattro LNB's on
a multiswitches. For Quattro & multiswitch use, its recommended to
increase the dish size up to the next dish size.

Thats why I am considering a 80 cm fixed dish for 28.2 E for all the
freesat & sky boxes only. A 1m fixed dish at 30 West with a 20 degree
Multi LNB holder.

As I'm interested in Astra 3 at 23.5E, adding on the 40 degrees to Astra
3 takes me to 16.5 West which is conveniently just past Telstar at 15W
which also is a fairly loud bird.

The T90's dish gain is not constant across the 40 degree arc, it is more
of a parabola, so the extreme sats need to be stronger than the middle
sats so hopefully the sat signal strengths will be fairly uniform across
the 40 degree arc. This works out quite well as Thor & Sirius, 9/10 E,
7.0E and 16.0E will be fairly near the middle portion of the T90's arc
and these are weaker.


My dish is pointed at 12e, half way between 28.5e and 5w. Both these
satellites give out strong signals to where I am in Kent - and I am not
trying to receive them from the extreme edge of the dish.



Coming back to the fixed 1m dish on Hispasat, as mentioned earlier this
has a multi LNB holder, I can then access sats across an arc of either

(a) Intelsat 901 at 18.0 West to NSS 10 at 37.5W (which includes hispasat)
(b) Hispasat 30 West to 45.0 West.

I suspect the intervening local terrain, satellte signal strengths and
low numbers of Ku band transponders will defeat me somewhat over this
extreme west part of the sky will probably limit me to Intelsat 901 at
18.0 West, NSS 7 at 22.0W, Intelsat 905 at 24.5W and Hispasat at 30.0W.





--
Michael Chare