Cahors Big Bisat

[Offtensive]

I was having a look at the Big Bisat to replace my Current Zone 2 Dish (focal @ 28.2e and offset @ 19.2e), with the aim of picking up a few more Sats.

However, I noticed that the specified "gain" of the Big Bisat (36db) is less than that of both the Bisat (37.5db) and a zone 2 dish (37db).

I am wondering if anyone has used this dish and what their thoughts on its performance is.

The aim would be to have 13e, 16e, 19e, 23.5e, and 28.2e on one dish, so I am also wondering if a 3 degree separation would be too tight with standard LNBs?

Thanks,
Offtensive

 

[Mickha]

In the UK, 13E, 19.2E, 23.5E and 28.2E are so strong that an 80cm dish should do the job.
There are dedicated dishes, designed for multi LNB use.

Which transponders, channels, are you trying to get?
there are also Bullet LNB's, designed for 3 degree of separation.

 

[Offtensive]

For 28.2e, 19.2e I would want to receive them all, which I am confident should be fine.

On the weaker Sat 16e, I am mainly after the strongish transponders like 10845 H 30000 3/5.

However, what I noticed after upgrading from a Zone 1 to a Zone 2, the odd feed that I would watch now and again on 28e wash much more stable on the Zone 2. I would get breakup on the Zone 1 often. Thus, I am a wondering if my reception for 28.2e would be compromised at all.

 

[cwsat]

For 28.2e, 19.2e I would want to receive them all, which I am confident should be fine.

On the weaker Sat 16e, I am mainly after the strongish transponders like 10845 H 30000 3/5.

However, what I noticed after upgrading from a Zone 1 to a Zone 2, the odd feed that I would watch now and again on 28e wash much more stable on the Zone 2. I would get breakup on the Zone 1 often. Thus, I am a wondering if my reception for 28.2e would be compromised at all.

The problem with having 13e,16e and 19.2e on a dish is how close the sats are. As 13e and 19.2e are so strong, they over power 16e so you need a decent sized dish to get it in the first place. I have tried with a 65cm dish and failed miserably trying to get 16e, with a single LNB. I know it's possible but I have never managed it myself. I am not actually too sure how robust 16e would be on a standard 80cm dish. The 85cm Gibertini I am using now is actually 90x85cm and performs pretty well on 16e, plenty of rain margin on 10845H. I have never lost reception in the rain.

Ideally you need a a minimum of a conventional 80cm dish with bulletnose LNB's. Normal LNB's on 13e,19.2e and 16e will clash. Inverto do a triple monoblock which I have myself, but it didn't particularly perform that well on my 85cm Gibby so I took it off and it's in a drawer.

Is there a reason you wouldn't want to go motorised? I messed about with the monoblock but in the end wanted 1w, 28.2e and 23.5e and some of the stronger feeds off 10e/7e so picked up a cheap diseqc motor.

Not looked back since, really makes life easier. Took a bit of tweaking but got there in the end. There are some really good performing single / twin output LNB's too.

 

[LeBelge]

I was having a look at the Big Bisat ...

Cahors Big Bisat will provide you with great disappointment for sure for 16°E.

16°E –> 10845 H 30000 3/5 with 99 cm dish next to the center I have
SNR = 12dB = 80%
AGC = 98%

You need a 110 cm dish for standard LNBs at 3 degree separation.
Like this one:

 

[cwsat]

Cahors Big Bisat will provide you with great disappointment for sure for 16°E.

16°E –> 10845 H 30000 3/5 with 99 cm dish next to the center I have
SNR = 12dB = 80%
AGC = 98%

You need a 110 cm dish for standard LNBs at 3 degree separation.
Like this one:

View attachment 148618

I agree. I don't think the Cahoors dish is big enough.

All the footprints show 16e being incredibly strong in the UK but in reality, it's not correct. It is swamped by 13e and 19.2e.

 

[Captain Jack]

I have a T90, which does the job well enough but I'd say it's no more effective than a 70cm dish if you go beyond 10 degrees from the centre. In the centre, it's equivalent to an 80cm dish.

It is, however, exceptionally ugly!

 

[deeptho]

I have a T90, which does the job well enough but I'd say it's no more effective than a 70cm dish if you go beyond 10 degrees from the centre. In the centre, it's equivalent to an 80cm dish.

It is, however, exceptionally ugly!

I also have one. The theoretical performance for the middle lnbs is much closer to 1m dish and the reception also seems to confirm that
in practice. Maybe the ugly versions have poorer reception :->

 

[cwsat]

I also have one. The theoretical performance for the middle lnbs is much closer to 1m dish and the reception also seems to confirm that
in practice. Maybe the ugly versions have poorer reception :->

Can’t see one coming close to a decent 1m.

No replacement for diameter.

People said the same about Penta’s and Fibo’s.

 

[Captain Jack]

Can’t see one coming close to a decent 1m.

No replacement for diameter.

People said the same about Penta’s and Fibo’s.

I am actually comparing the T90 to the Penta 85 I had. Penta 85 outperformed T90 in every way on the same satellite/LNB/weather conditions.

I think Fibos are slightly overrated but they are good performers. Certainly the Fibo 90 is no worse than a "normal" 1m dish.

 

[Captain Jack]

I also have one. The theoretical performance for the middle lnbs is much closer to 1m dish and the reception also seems to confirm that
in practice. Maybe the ugly versions have poorer reception :->

The theoretical performance is exactly why I got it in the first place. I was disappointed.

It could well be that I haven't aligned it properly - it's a tricky beast to set up right.

 

[cwsat]

I am actually comparing the T90 to the Penta 85 I had. Penta 85 outperformed T90 in every way on the same satellite/LNB/weather conditions.

I think Fibos are slightly overrated but they are good performers. Certainly the Fibo 90 is no worse than a "normal" 1m dish.

Is the Fibo not 90x99cm though?

You can get ‘some’ 1m dishes with very similar dimensions. The new flavour of Triax TD110’s are just about 1m.

I wouldn’t mind having a play with a Fibo tbh. Heard good things about then, it’s just getting the Fibo on a diseqc motor.

 

[Offtensive]

The problem with having 13e,16e and 19.2e on a dish is how close the sats are. As 13e and 19.2e are so strong, they over power 16e so you need a decent sized dish to get it in the first place. I have tried with a 65cm dish and failed miserably trying to get 16e, with a single LNB. I know it's possible but I have never managed it myself. I am not actually too sure how robust 16e would be on a standard 80cm dish. The 85cm Gibertini I am using now is actually 90x85cm and performs pretty well on 16e, plenty of rain margin on 10845H. I have never lost reception in the rain.

Ideally you need a a minimum of a conventional 80cm dish with bulletnose LNB's. Normal LNB's on 13e,19.2e and 16e will clash. Inverto do a triple monoblock which I have myself, but it didn't particularly perform that well on my 85cm Gibby so I took it off and it's in a drawer.

Is there a reason you wouldn't want to go motorised? I messed about with the monoblock but in the end wanted 1w, 28.2e and 23.5e and some of the stronger feeds off 10e/7e so picked up a cheap diseqc motor.

Not looked back since, really makes life easier. Took a bit of tweaking but got there in the end. There are some really good performing single / twin output LNB's too.

Thanks, I do have a motorised, this is for upgrading with the sats the I use the most so that I can view them on multiple boxes simultaneously.

I have a T90, which does the job well enough but I'd say it's no more effective than a 70cm dish if you go beyond 10 degrees from the centre. In the centre, it's equivalent to an 80cm dish.

It is, however, exceptionally ugly!

Thanks @Captain Jack I did read through your T90 thread the other day. I saw that you grounded mount a low pole, has that pole been ok supporting the weight over the past few years? I did have a look at a T90, but I would have to ground mount it on a pole and have the pole at least 1m above the ground, and was worried a tad as the dish seems very front heavy.

 

[Captain Jack]

it’s just getting the Fibo on a diseqc motor.

It's simple enough - just needs some bracketry. I've only ever driven mine on a DiSEqC motor. An alu box section and some U-bolts to grab the the motor stub.

I still have mine for sale

I saw that you grounded mount a low pole, has that pole been ok supporting the weight over the past few years? I did have a look at a T90, but I would have to ground mount it on a pole and have the pole at least 1m above the ground, and was worried a tad as the dish seems very front heavy.

It seems to have stood the test of time. I've only had to realign it once, due to me constantly hitting it with a lawnmower... It's perhaps TOO low!

 

[cwsat]

It's simple enough - just needs some bracketry. I've only ever driven mine on a DiSEqC motor. An alu box section and some U-bolts to grab the the motor stub.

I still have mine for sale


It seems to have stood the test of time. I've only had to realign it once, due to me constantly hitting it with a lawnmower... It's perhaps TOO low!

Shame you can’t ship it Captain Jack or I would have it off you.

If I am down your way I will let you know.

 

[cwsat]

How heavy are the T90’s?

My Gibby 85cm is on a 2.5” pole mounted to a paving slab with a pretty heavy dark superior motor on it.

The dish is 8kg alone.

It hasn’t taken off, yet……

 

[Offtensive]

It's simple enough - just needs some bracketry. I've only ever driven mine on a DiSEqC motor. An alu box section and some U-bolts to grab the the motor stub.

I still have mine for sale


It seems to have stood the test of time. I've only had to realign it once, due to me constantly hitting it with a lawnmower... It's perhaps TOO low!

Did you use 4mm x 60mm pipe for it? The only one I have seen that I could get hold off for a reasonable price has a 3,25mm diameter. Due to some upcoming garden work, I would have to use a pole to pole mount to attach the 60mm pipe to a Patio Mount.

 

[deeptho]

I also have one. The theoretical performance for the middle lnbs is much closer to 1m dish and the reception also seems to confirm that
in practice. Maybe the ugly versions have poorer reception :->

I think I must retract what I wrote: I have a wavefrontier T90, but obviously this thread is about the Cahors, which also perhaps uses the
T90 code. I did not notice the thread name when I wrote it and assumed T90 was the wavefrontier.

The wavefrontier T90 is big and at the center does perform like a 1m dish. There are ways to set it up wrong as teh sub-reflector can be
accidentally mounted upside down.

 

[Offtensive]

How heavy are the T90’s?

My Gibby 85cm is on a 2.5” pole mounted to a paving slab with a pretty heavy dark superior motor on it.

The dish is 8kg alone.

It hasn’t taken off, yet……

I think it’s about 20kg, but it’s front heavy with that second reflector.

I think I must retract what I wrote: I have a wavefrontier T90, but obviously this thread is about the Cahors, which also perhaps uses the
T90 code. I did not notice the thread name when I wrote it and assumed T90 was the wavefrontier.

The wavefrontier T90 is big and at the center does perform like a 1m dish. There are ways to set it up wrong as teh sub-reflector can be
accidentally mounted upside down.

Not to worry, there’s talk about a T90 on this thread too. Plus, it does help me as that is my second choice for a dish.

 

[cwsat]

I think it’s about 20kg, but it’s front heavy with that second reflector.


Not to worry, there’s talk about a T90 on this thread too. Plus, it does help me as that is my second choice for a dish.

If it’s 20kg I’d go with a proper patio / non penetrating ground mount. 4 slab job!

Mine rocks about too much for my liking.