New Lnb changer

[RimaNTSS]

25.8* - I doubt. But also 21.5* is not realistic, so dish can not be 1800 x 1935mm! Most likely it is 1800 x 1950 mm and has offset angle 22.6*. So, why you (owners of Lami 1,8m) do not do re-measuring?
Last edit for today: I also suspect that new Laminas AS-1800 can be warped. Perhaps I am wrong.

 

[Archive4]

25.8* - I doubt. But also 21.5* is not realistic, so dish can not be 1800 x 1935mm! Most likely it is 1800 x 1950 mm and has offset angle 22.6*. So, why you (owners of Lami 1,8m) do not do re-measuring?

FFS the dish IS 1800 x 1935/6 on the WAD. I have no idea what the angle is, but at the end of the day the dish works well! WGAF?

 

[Captain Jack]

This is my last measurement I am taking as I am losing the will to live here.

The angle of the dish pointing at 4w at my location is 9 degrees according to my crude inclinometer. It may be 9.5 or it may be 8.5 - don't care. According to numerous sources, Amos at 4w at my location has an elevation of 31.2 degrees. Or it could be wrong. Ergo, dish offset angle is 31.2 - 9 = 22.2. Close to what the manufacturer is quoting. But that's probably wrong too.

It's a wonder it works at all.....

 

[Trust]

Yesterday evening I received a nice drawing from Femi , living N/E from Austria , 16º E is most south for him .
Asked him this morning for his exact location data to calculate his offset angle .
How much different Lami's are there ?? his dept 151.6 mm ? and size M 544.8 mm
He has a AS-1800G , meaning the dish include heating , at the back there is a connection box for the wiring .
By all this differences its clear to me to make the sidearms at beamside adjustable in case I make a changer for original Laminas data .
But I tend more in the direction to make them with the Parabola calculation , since that brought ± 1 dB profit at tha 1.8 CM .
But even then sidearm and other adjustment will be made included .

 

[Archive4]

I´ve just re checked M using a more traditional method which does not involve playing around in the dark and trying to allow for the hidden part of dish, or laser at angle.

 

[Archive4]

I was not going to post this, but feel I must, as at the end of the day we all want one thing. Correct measurements and the thing to work!

Stated above A - B´ = 1364,6mm. Cannot be correct, puts laser line far to high on dish.



I´ll back off now and leave you to it, was trying to help, but obviously not doing so.

EDIT: Forgot to add as1800 and as1800g have same parameters according to Laminas

 

[Trust]

To know what to do tomorrow , I like to know what the Lami fans think about making the changers with the Parabola data .

 

[Captain Jack]

Looks close enough. Go for it

 

[Archive4]

Any chance of a translation? My Russian is not good, but my maths is ok, so get the idea , roughly where the trained monkey fired the laser a couple of days ago!

 

[Captain Jack]

Opening angle 79 degrees, offset angle 21.5. The middle bits are the distances in mm from various points on the dish in the picture. LNB position will be adjustable between 1233mm and 1238mm (5cm). Should be ok.

 

[Archive4]

Opening angle 79 degrees, offset angle 21.5. The middle bits are the distances in mm from various points on the dish in the picture. LNB position will be adjustable between 1233mm and 1238mm (5cm). Should be ok.

Only if it is 1233 and 1283 but I get the idea

 

[Captain Jack]

Err... Yes. Excuse the phone fart.

 

[Archive4]

Celebratory drink? Or what!

 

[RimaNTSS]

Nobody makes antennas with offset angle smaller than 22* (at least I do not know)! Laminas AS-1800 has WOD dimensions exactly copied from CM 1,8m, namely 1800 x 1950mm and offset angle 22,6*. Measure carefully vertical size of WOD and you will get 1950mm.

 

[Archive4]

Nobody makes antennas with offset angle smaller than 22* (at least I do not know)! Laminas AS-1800 has WOD dimensions exactly copied from CM 1,8m, namely 1800 x 1950mm and offset angle 22,6*. Measure carefully vertical size of WOD and you will get 1950mm.

Methinks we have to differ on that.
How many Laminas AS 1800 do you have? 1,2,3, None
I have two ( 2 ) 1800 x 1935 and all the snow in Africa is not going to change it!

 

[RimaNTSS]

I do not need Laminas AS-1800 to conclude that company did not care to put in specifications of the dish proper data. And, even if you have 2 dished I am not sure you have measured vertical dimension properly. Show picture how did you measure!

 

[RimaNTSS]

OK, I will re-post picture from that thread Is that the way how you measure the dish? I am just wondering, if Laminas would not make a mistake and put 1950 instead of 1935 in the specifications, what would your measurement look like? 1950?

 

[Trust]

Rimants , did you missed this one ?

Ok, using the 40 x 40 box tube I have carefully positioned said tube in the dead centre of the dish as pictured. Have carefully measured to the widest point to both sides. The box tube is exactly 1940 mm long as measured by Dave ( my welder ) and confirmed by me.
As you will see from the pics the height of the WAD is under 1940 by a few mm, so may be as big 1936 / 1937 mm. At widest point of dish it is 1800 ( 2 x 880 plus 40 mm ). However, by laying of the floor to get an exact measurement at the cross point ( just below the lock cut out ) the depth is only 166 mm, not 170 mm as previously stated, so I stand corrected. ( Once I got up from the floor )View attachment 92808 View attachment 92809 View attachment 92810 View attachment 92811

Will re check measurements with said box tube and laser when have time, probably tomorrow, as have to go to friends BBQ this afternoon.

Clear to see the real reflecting surface starts wide from the edge .

 

[Trust]

Nobody makes antennas with offset angle smaller than 22* (at least I do not know)! Laminas AS-1800 has WOD dimensions exactly copied from CM 1,8m, namely 1800 x 1950mm and offset angle 22,6*. Measure carefully vertical size of WOD and you will get 1950mm.

Got the location data from Femi : 48.60 N 15.55 E .
His closest sat to south ( wich he used for his drawing ) Eutelsat 16A , Dishpointer tells for his location : AZ true 179.4º Elev. 34.2º
His Lami is leaning back 11.8º , so in his situation the offset is 34.2 minus 11.8 = 22.4º

The vertical messurement from @Milamber looks good to me , but I we still use the 1800 for the horizontal size .
I like to ask Milamber to do the same accurate messurement for that horizontal size .
Parabola calulates the offset angle with a depth of 170 mm :
1950 x 1800 = 22.6º
1935 x 1800 = 21.5º
but if 1800 should be 1785 (for example)
1935 x 1785 = 22.7º

edit : also like to know the real outside dimensions

 

[Archive4]

Got the location data from Femi : 48.60 N 15.55 E .
His closest sat to south ( wich he used for his drawing ) Eutelsat 16A , Dishpointer tells for his location : AZ true 179.4º Elev. 34.2º
His Lami is leaning back 11.8º , so in his situation the offset is 34.2 minus 11.8 = 22.4º

The vertical messurement from @Milamber looks good to me , but I we still use the 1800 for the horizontal size .
I like to ask Milamber to do the same accurate messurement for that horizontal size .
Parabola calulates the offset angle with a depth of 170 mm :
1950 x 1800 = 22.6º
1935 x 1800 = 21.5º
but if 1800 should be 1785 (for example)
1935 x 1785 = 22.7º

edit : also like to know the real outside dimensions

Sorry Trust1, I feel I am no longer able to help on this topic