Fibostöp 120cm and Moteck

Likvid

I got my Fibostöp 120cm dish today


I was thinking of putting the dish on a Moteck SG2100A motor, anyone got any experience of this?

The dish is pretty average heavy around 18-20kg.

Anyone running this setup?

johnsattuk

I have converted my 90cm Fibo. with an SG2100A motor and I am very pleased with the result. It is certainly no slower and I think a little quieter.

I am planning to convert my 120cm in a similar way, its running on my Echostar at the moment, but i plan to use with my DB7000 so a DiseqC & USALS would be more convenient.

I converted the 90 cm using the Fibo. mounting system, which I like, this means that the motor only has rotating duties to perform, it does not carry any of the weight of the dish or its mount, and I didn't have to use any of those rubish 'U' bolts that you dont like.

I will convert my 120cm in a similar way, ie: use the Fibo. mount to carry the dish. Because of the different design of the 120cm mount, I think it will be easier to convert than the 90cm

Likvid

I am out of ideas, i have the original H-H mount to the Fibo 120cm dish but i really don't know anymore how to mount the Moteck to it.

You know the two brackes that attaches to the backring of reflector?

Those brackets got two holes each to attach to the rest of the mount, i was thinking of setting aluminium bars across those brackets and then attack the original AZ/EL-mount from my Fibo 90cm.

But the problem is that there is a too deep angle those holes are put there and i really don't want to drill another holes in the original mount as i want to preserve everything as much as i can.

I can't mount another AZ/EL-mount to the backring on the reflector directly either as the ring is curved and not flat which makes it ackward.

I am out of ideas.....

I can't use the original H-H mount either as i don't have a 76mm pole, just 60mm, then the mount takes too much space on my small apartment balcony.....

Otherwise i could have used that as the motor and mount is in perfect condition.

johnsattuk

The conversion of my 90cm Fibo mount did not involve any changes to the mount other than drilling a couple of 6mm holes in the rotating part and one 8mm hole in the main body. none of these would be particularly noticable or have a detrimental effect if the mount were returned to standard. Like you I did not want to butcher the origional any more than neccessary.

Similarly, the conversion that I have in mind, for the 120cm would involve minimum modifications to the existing mount, one hole 6mm on the pivot point of the rotating part and two holes, one each side, in the steel mounting plates that you mentioned. I expect that the rear mounting bracket for the SG2100 would probably need a couple of holes in the static part of the mount. None of these would have any noticable effect, converted or not.

The 60mm pole would not bother me, I would just replace the 4 M10 socket screws with some longer ones and make sure that I adjusted them evenly.

If you are saying that the Fibo. mount as a whole is too big then that is another problem altogether. If I had that problem I would probably be looking at fitting a 1224 motor up close to the dish, but then you are back to 36v no USALS

If you felt that it might help, I could probably make a bit of a mockup to show what I propose doing on mine, and send you pics, I know I'm not to good at explaining things.

Likvid

Yeah that would be great if you could send some explanation pics.

I have been to my metal supplier and bought a aluminum bar i am thinking of cutting, i will try to make a picture and explain my thinking.....

Likvid

Yes USALS is the way to go today, i wouldn't go back to 36V motor again.....

I was hesitating first converting from 36V to USALS but now i have found that USALS is really great and i wouldn't want to be without it.

36V motors loses pulses from time to time which is one of the big drawbacks i beleive.

mhku

Use a hacksaw to cut the aluminium, an angle grinder disk will "clog up".

johnsattuk

Been having a play with scissors, cardboard and hot melt, pics to prove it

ignore the cardboard tube supporting the backend of the motor just needed for the mockup.

Have marked in white dots approx. positions for drilling.

I would probably use 4mm plate for the rotating adaptor and weld/silver solder the motorshaft adaptor to it.

Although I have shown a folded bracket, on second thoughts i would use a flate plate, bolted to a 16mm sq. section x 130 lng, with the end's drilled and tapped and bolted between the Fibo. plates.

I have shown a pic of the shaft adaptor i used on my 90cm, but the one for this would be similar.

I would probably use 3mm plate on the anti-rotation bracket. The bracket is 100mm wide, the motor bosses are 95mm wide, so the bracket would need apropriate washers for packing. This is handy as it gives the opportunity to fine tune the zero pos.

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johnsattuk

OK
Put the scissors away and got out the hacksaw, pics attached. Brackets not painted yet, I shall try and get them powder coated. I did make two sets in case Likvid wanted to go that way, so I do have an unused set.

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Likvid

Ok.

I have some serious problems with my delivered Fibo 120cm dish.

After working with the dish for nearly a whole day i have given up, the dish have terrible sidelobe performance and you can actually find a signal from the same satellite in three different locations due to heavy damage to the reflector.

It works like a good 80cm Offset dish in performance.

I thought the dish was ok as i couldn't see any damages to the dish on arrival, but after playing with it i understand the dish is warped severely from something heavy hitting it during transport.

After closer inspection with several strings crossed over the dish to check for warpage i was right, the dish is warped and in some places the gap in the cross in the middle of the dish is about 1.5cm between the crossing strings.

There is no way to straight out a warped dish again, it's useless....

It's really sad that some dealer and people don't understand how to pack a aluminium dish, the only way to transport a dish like this is in a wooden crate.