Inverto Black Ultra & 1.8m Prime Focus Dish?

[pride21]

hi nabih here is a picture of a black ultra grafted on a prime focus feed.cheers

 

[Vipersan]

hi nabih here is a picture of a black ultra grafted on a prime focus feed.cheers

..and doing it that way doesn't require cutting or destroying the offset feed of the black ultra ...just a few holes to drill..
seriously consider Prides variation...its relatively straightforward ..
The black ultra has had its plasic covers removed btw ..its effectively naked.
rgds
VS

 

[nabih]

hi nabih here is a picture of a black ultra grafted on a prime focus feed.cheers

Thanks pride 21 i m going to try it whatever the consequences.

 

[nabih]

..and doing it that way doesn't require cutting or destroying the offset feed of the black ultra ...just a few holes to drill..
seriously consider Prides variation...its relatively straightforward ..
The black ultra has had its plasic covers removed btw ..its effectively naked.
rgds
VS

Thanks Vipersan

 

[BM300]

hi nabih here is a picture of a black ultra grafted on a prime focus feed.cheers

Curious abut the inverted Glass cup (good Feed protection), would it function the same as a plstic cup or there will be a slight loss?
May also act as a glass house if the sun is out.

 

[Vipersan]

Curious abut the inverted Glass cup (good Feed protection), would it function the same as a plstic cup or there will be a slight loss?
May also act as a glass house if the sun is out.

The plastic cup cover wouldn't be so critical on a PF dish as the lnb would be angled downward toward the dish centre ..but very important if the lnb is mounted on an offset dish ..where the lnb is angled upward thus leaning back.
In the latter case it would prevent rainwater ingress.
Whereas you could lose the cover on a PF as it would naturally drain due to gravity.
In both case however it would prevent spiders making a home in you lnb ...and indeed birds ..magpies etc from feeding the lnb throat with food and treasure.
Believe me ..it does happen ..I've found allsorts in open lnb throats over the years.

Losses are minimal if suitable plastics are used...afterall ..a plastic cover is fitted over offset lnbs as standard
rgds
VS

 

[Channel Hopper]

Losses are minimal if suitable plastics are used...afterall ..a plastic cover is fitted over offset lnbs as standard
rgds
VS

There is also a chance that the plastic improves reception, as many found when experimenting with rain shields on offset dishes back in the 90's. Something to do with the dielectric properties converging the incoming waves by refraction.

 

[sonnetpete]

..I've found allsorts in open lnb throats over the years.....

....Didn't know Bertie Bassett had a dish......

 

[Vipersan]

....Didn't know Bertie Bassett had a dish......

He probably does ...but the all sorts ...was a typo but not too far from the truth ..
I once found 2 jelly babies in my open ku feed mounted on a 1m pf at the apex of the house..
At first I thought a friend had played a practical joke ..rigging ladders during the night ..climbing up and shoving sweets and bits of bread into the feed.
I noticed when my signal reduced to near zero overnight.
Close observation revealed birds mistaking the open feed for the open beaks of their chicks ...and were literally ...feeding the cuckoo/lnb.
needless to say ..I was gobsmacked.
rgds

 

[pride21]

hi BM300 the protective cover on the feed is from miniture jellys or small trifles from the supermarkets i put them on my c-band lnbf there is no loss what so ever.cheers

 

[Channel Hopper]

hi BM300 the protective cover on the feed is from miniture jellys or small trifles from the supermarkets i put them on my c-band lnbf there is no loss what so ever.cheers

C band is not Ku band.

(For replacement covers on Fibo dishes, I have used Tesco mushroom pate pot bases in the past, they are an exact size for the original green one that has perished away)

 

[pride21]

what i meant CH is i use the pots on KU band and also c-band.

 

[Moradabad]

I finally tested this lnb and below are the results

I tested it on Hotbird and result was strange black ultra was only increasing Vertical Tp's those were increased by 5-7% but my horizontal Tp's went down.

When I removed it and again used my normal lnb again I was able to increase by Horizontal Tp's

Example:

With Normal LNB

Vertical TP 7.0 Db
Horizontal TP 7.0 Db

With Inverto

Vertical Tp went to 7.5- 8.0
Horizontal Tp went down to 5.0, so finally I removed inverto as I was much more interested in my Horizontal Tp's that had good channels

 

[Phoenixx]

hi all

I have a 140 prime focus from old analog time but i search from a 180 does anybody know when the panels of jonsa are good fitted the dish working like promise on paper ?

Btw i have ordet a prime focus lnb from china and fitted in 140 dish with very good results ;) but i want thai beam and other more weak signalsView attachment 44085View attachment 44086

 

[PaulR]

If your 140cm dish is a reasonably good make and in good condition it is unlikelythe Jonsa 180 will be better. It may even be worse as the Jonsa/Fortecstar multi-section dishes are notorious for being difficult to assemble anything like correct and then underperforming as a result.

Even if you do manage to get the Jonsa into a good shape they are very flimsy and will deform easily in wind.

 

[Analoguesat]

hi all

I have a 140 prime focus from old analog time but i search from a 180 does anybody know when the panels of jonsa are good fitted the dish working like promise on paper ?

The cheap big multi section dishes often perform abysmally - any distortion in them and you will be lucky if its behaving like a 1m. These dishes need regular maintenance and tweaking - its not going to be a "put it together and forget about it" installation.

 

[BM300]

With multi section dishes, you need to assemble the dish face down on a flat surface.
Using a small ruler make sure that the sections are not sticking out before tightening the bolts holding them to gether.

Regarding the prime focus LNB, you need to make sure that the FD ratio is correct and mathes the dish.

 

[bonou2]

hi all

I have a 140 prime focus from old analog time but i search from a 180 does anybody know when the panels of jonsa are good fitted the dish working like promise on paper ?

Btw i have ordet a prime focus lnb from china and fitted in 140 dish with very good results ;) but i want thai beam and other more weak signalsView attachment 44085View attachment 44086

hi,@Phoenixx
Please tell me the shop where you purchased this lnb because I am interested to test it myself,and the price+custom
a test between this lnb from china and inverto face to face which is better??
and the winner is............??
Wait for feedback here or via pm
thanx in advance

 

[Costactc]

I'm using the jsc322-2 lnbf which is offset on my 2.4m fortec prime focus dish with excellent results so I can't see why your offset lnbf wouldn't work well. You'll notice in the pics that I'm using a scalar ring to keep the lnbf in place:

 

[Moradabad]

I'm using the jsc322-2 lnbf which is offset on my 2.4m fortec prime focus dish with excellent results so I can't see why your offset lnbf wouldn't work well. You'll notice in the pics that I'm using a scalar ring to keep the lnbf in place:

Costactc thanks for the feedback,but once you get hold of some good PFA lnb the only you will get the desired result.

many years back even I thought both will do the same job.

Finally I tried to get hold of many famous brands offset as well as PFA lnb's, tested on 180 to 4 meter dishes.

And here is the outcome, I found FUJI PFA lnb is really good, its difficult to get hold of that nowadays as the production is no more, alternate to this is Star gold Fuji that is available in market, once you get it then only you will come to know.

Even Invacom Quad C120 also gives same or better result than FUji but its too costly then FUJI