Replacement Eye stud for 1.2M Gibertini?

[aceb]

As the title, where might I be able to obtain a Stainless equivalent of the declination fine adjuster for the Giby? It measures M8x170MM although only needs to be 90MM from threaded tip to centre of eye.

The original is obviously BZP as mine is now DRK (Dull, Rusty and Knackered) and I'm fed up with continually coating it in grease and having to wire brush it to stop it seizing up.

Standard eye bolts are too large in the eye to fit the gap behind the reflector support, I've found marine wire eye studs but none are long enough.

For a laugh I may ring up the UK distributors for Giby, Europasat? and get a price for a replacement part but I'm sure it will be stupid money but would prefer stainless as I'm currently replacing all the other nuts and bolts with stainless equivalents.

 

[skomedal]

Try direct mailing Gibertini HQ in Milan Italy, explaining your dilemma.

gibertini@gibertini.it

They sent me a single piece lnd holder to replace the 2 piece alloy holder that came with the dish.

Free of charge

Well done from gibertini

You can send your query in english.

Good luck.

Regards

 

[Terryl]

If your not worried about the cost, find a machine shop and have one made, or make up a ton of them and start selling them on Ebay, then you can make your money back. (maybe)

 

[skomedal]

Might help to mail a photo of the ( offending ) part to be replaced in your first mail to them.

Regards

 

[william-1]

Try direct mailing Gibertini HQ in Milan Italy, explaining your dilemma.

gibertini@gibertini.it

They sent me a single piece lnd holder to replace the 2 piece alloy holder that came with the dish.

Free of charge

Well done from gibertini

You can send your query in english.

Good luck.

Regards

Excellent advice my plastic Lnb holder broke so I e mailed Gibertini explaining what had happened & 7 days later I received a cast metal Lnb holder but could not fit it due to the part requires an adaptor to bolts onto arm,
So I then sent a photo of my old Lnb this morning I received the adaptor part & fitted it the Gibertini 100cm works excellent had to slightly adjust the dish declination due to the extra weight of the new Lnb holder all signals up 10 to 15%now I have the correct angle for the Lnb looking at the dish
All free of charge my next dish will definitely be a Gibertini when I replace my old rusty 88cm next year,

Well done Gibertini

 

[RimaNTSS]

I have the correct angle for the Lnb looking at the dish

One question Couple of questions : And this angle is...? How did you make sure angle is correct? Did you make sure phase center of LNB is located exactly in focal point of antenna?

 

[skomedal]

Please give us a break from your superior knowledge of focus points, and the spot g. Which as far as i can see is one of your ongoing projects.

Were amateurs doing our best with trial and error.

Regards

 

[RimaNTSS]

I am maybe more amateur than any of you, but know for sure that in order to get maximum possible of antenna it is vitally necessary to put LNB in correct place and point it to proper spot. Trial and error method is almost not applicable here.
But if it was said that LNB has correct angle, I suppose it is correct, meaning exact # of degrees.

 

[william-1]

One question Couple of questions : And this angle is...? How did you make sure angle is correct? Did you make sure phase center of LNB is located exactly in focal point of antenna?

By trial & error using a signal meter on the TM5502HD via my desktop monitor viewed from the dish though my living room window checked that the dish was aligned at my Longitude approx 0.0 then adjusted the dish declination with the heavier Lnb,

Checked the arc 47.5 east to 45 west by lightly flexing the dish at the top & bottom at 47.5E 26E 21.5E 3.1 E 7W 7.3W 20W 22W & 45W no signal gain during flexing so the arc is being tracked 99.5% correctly,
Lnb Adjusted 1 degree further clockwise I noticed this from my img 2 above the skew was wrong moved the Lnb back & forth for the best signals now getting over 90% signal quality on most satellites including feed satellites.

 

[RimaNTSS]

william-1 please do not take offense at my questions.
From your picture I clearly see that LNB is located too close to the dish. And fact that by moving it so close you got maximum signal not really mean LNB's phase center is located in focal point of antenna. If you would move LNB further and adjust elevation of antenna you would probably get even better signal. LNB tilt is another issue, direction of LNB should divide angle between top of the dish- Focal point and bottom of the dish exactly in half.
So, by saying "correct angle for the Lnb looking at the dish" you really meant not concrete angle but angle at which you got maximum signal? Right? But if LNB is located not in focus than this angle, unfortunately also not necessarily correct.

 

[Archived-1]

By trial & error using a signal meter on the TM5502HD via my desktop monitor viewed from the dish though my living room window checked that the dish was aligned at my Longitude approx 0.0 then adjusted the dish declination with the heavier Lnb,

Checked the arc 47.5 east to 45 west by lightly flexing the dish at the top & bottom at 47.5E 26E 21.5E 3.1 E 7W 7.3W 20W 22W & 45W no signal gain during flexing so the arc is being tracked 99.5% correctly,
Lnb Adjusted 1 degree further clockwise I noticed this from my img 2 above the skew was wrong moved the Lnb back & forth for the best signals now getting over 90% signal quality on most satellites including feed satellites.

That's how I set mine up William, I have never used a signal meter, I use a stb, I loved my TM 1500 for more than one reason, it was great for alignment of a dish very sensitive,

If I am pulling fringe transponders in it cant be that far out/maybe spot ? I will never know, but its not giving me a headache trying to understand all the ins and outs that I probably would never understand if I tried .

 

[skomedal]

From your picture I clearly see that LNB is located too close to the dish.

Maybe only showing new lnb holder with adapter splines supplied by Gibertini free of charge.

Received today according to post.

Regards

 

[william-1]

william-1 please do not take offense at my questions.
From your picture I clearly see that LNB is located too close to the dish. And fact that by moving it so close you got maximum signal not really mean LNB's phase center is located in focal point of antenna. If you would move LNB further and adjust elevation of antenna you would probably get even better signal. LNB tilt is another issue, direction of LNB should divide angle between top of the dish- Focal point and bottom of the dish exactly in half.
So, by saying "correct angle for the Lnb looking at the dish" you really meant not concrete angle but angle at which you got maximum signal? Right? But if LNB is located not in focus than this angle, unfortunately also not necessarily correct.

I will experiment tomorrow if I get more signal I may even get Badr 5/6 & Nilesat 201 ;)
Normally I have the Lnb much further back in the Lnb holder so as to focus on the dish area but as the signals were so high I overlooked this

 

[RimaNTSS]

I will experiment tomorrow

Experimentation is a great spending of spare time. But, unfortunately, purely by experiments it is almost impossible to place LNB in proper place..... IMHO. The best way to accomplish this task is to calculate focal point of antenna and then place LNB directly in calculated position. OK, I've started to go all around and around.

 

[RimaNTSS]

For a laugh I may ring up the UK distributors for Giby, Europasat? and get a price for a replacement part but I'm sure it will be stupid money but would prefer stainless as I'm currently replacing all the other nuts and bolts with stainless equivalents.

Aceb! I an totally agree with you on that! That is exactly what I am doing last times. Could you show item you are looking and maybe make some drawing of it, than we could probably share some ideas how to make this part out of INOX without opening our wallets very wide ;)

 

[william-1]

My plan is to drive the dish to my reference satellite IS-10-02 @ 1 west then move the Lnb further out by 10mm followed by adjusting the dish declination whilst viewing the signal bars for maximum signal,
If the quality level goes up then follow the same procedure until the signals go down

 

[RimaNTSS]

Good plan, but... not easy realizable :mad:
Are you pretty sure that new holder holds LNB high/low enough? What if real antenna's focus (Green dot) is not located on your LNB's axe? Than you will never be abbe to place LNB in proper place. Moreover, after each 10mm of movement of LNB, you will probably also need to slightly adjust LNB tilt.
And finally, are you going to check signal level on some particular frequency? Horizontal or vertical polarization? Low/high frequency?
So, I am again back to formula "MMCPP":
- Make sure your antenna not warped;
- Measure it carefully;
- Calculate position of Focal point;
- Place LNB exactly in focal point, so LNB's phase center is co-located with antenna's Focal point;
- Point LNB to G-spot (give it correct angle).

 

[william-1]

Just received a reply from Gibertini

Thanks for the LNB attachment for the Lnb on my Gibertini 100 cm dish (Series X OP100)

I have fitted this to the Lnb arm & Lnb holder all working ok,
Dish & Lnb performance is much better than before,

Thanks again for your excellent service,

Kind Regards..............Will



Gibertini
16:15 (5 hours ago)

to me
You are welcome!

Best regards

Customer care
GIBERTINI SRL

Il 27/11/2014 16.33,

 

[william-1]

Good plan, but... not easy realizable :mad:
Are you pretty sure that new holder holds LNB high/low enough? What if real antenna's focus (Green dot) is not located on your LNB's axe? Than you will never be abbe to place LNB in proper place. Moreover, after each 10mm of movement of LNB, you will probably also need to slightly adjust LNB tilt.
And finally, are you going to check signal level on some particular frequency? Horizontal or vertical polarization? Low/high frequency?
So, I am again back to formula "MMCPP":
- Make sure your antenna not warped;
- Measure it carefully;
- Calculate position of Focal point;
- Place LNB exactly in focal point, so LNB's phase center is co-located with antenna's Focal point;
- Point LNB to G-spot (give it correct angle).
View attachment 70268

I will check a 1st daylight tomorrow thanks for your input.

 

[skomedal]

Same as me good customer care from Gibertini

Regards