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2.4 Channel Master Offset

nelson_b

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My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#61
Nelson what's your sub Saharan beam like? I bet you'd get a lot more of the Russian beam if frequency reuse wasn't there. I get 12245H and 12054H for DSTV (nice to see old names like Supersport scanning in).
Using the 1.8 to check those transponders i get 8.7 - 9.db on 12245 H and
on 12054 H i get 0.0 to 1.0 db ..... but if i select V i get a fairly steady 2.0 db :-lol

i,m leaving the circular setup on the big dish for now - to see how much it is a time of day thing with the transponders i get there .....
 

nelson_b

Contributor
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My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#63
Do you still want that circular lnb?
yes - i wouldn,t mind trying it, to see how it compares to todays arrangement ...
when ever its convenient for to you to send it ....
 
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Sky
My Location
UK
#65
As the weather cleared this afternoon and i,m probably going to be out and about most of this weekend i put the universal/circular setup on this dish ...
No more of the Russian transponders were gained ... just got the three (now with a decent margin) that had very occasional/ marginal lock on the 1.8 1n the past .. the only difference being that 12092 now locks on the circular setup and is now the strongest -- where previously it was the weakest on circular and would only lock with a linear l.n.b. on wrong polarity ...
i tried 3 different C120 universals on the c.m. feed + plate
Inverto white tech
Inverto black pro
and Invacom quad
to be honest they are about equal ... the black pro had 0.1 db over the other two .
Such a pity that everything is encrypted here on these three transponders :(:(

View attachment 98535 View attachment 98536 View attachment 98537 View attachment 98538
hello nelson please read here
Forum - View Single Post - HD 4136 - additional FTA networks on IS20

HD 4136 - additional FTA networks on IS20 - Forum
 

nelson_b

Contributor
Messages
1,524
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1,378
My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#66

nelson_b

Contributor
Messages
1,524
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1,378
My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#69
Hello nelson, picked this up for testing, will report findings when dish goes up
View attachment 100108 View attachment 100109 View attachment 100110
Hi -- B.M.

I t looks almost unused ... will be interesting to see what kind of performance you get from that OMT ... have you got l.n.b,s that will fit on it ....

I have something similar that came with some other kit years ago but i,v never used it as i did not have the correct type of l.n.b. ... must try and find it later and see if its the same .... i,d forgotton about it till i saw your picture :)

Did you get the dielectric plate/slab with the feedhorn ?
 
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My Satellite Setup
Sky
My Location
UK
#70
Hi -- B.M.

I t looks almost unused ... will be interesting to see what kind of performance you get from that OMT ... have you got l.n.b,s that will fit on it ....

I have something similar that came with some other kit years ago but i,v never used it as i did not have the correct type of l.n.b. ... must try and find it later and see if its the same .... i,d forgotton about it till i saw your picture :)

Did you get the dielectric plate/slab with the feedhorn ?
Hello nelson, it came as a unit OMT and feed horn, no lnb but will get some, friend spotted it and bought it on my behalf £43 :)

Post some pictures when you find it please.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
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My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK South
#72
It's a cross-pol feed for uplinking, used in the late 90's, and would normally have been fitted to a 90cm CM dish. All decommissioned around 2004.

I have the NJRC uplinking kit and LNBs in the shed if you are interested (all High Ku 12.5 GHz from memory but can check over the weekend).

The feeds will work on all frequencies though.
 
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My Satellite Setup
Sky
My Location
UK
#73
It's a cross-pol feed for uplinking, used in the late 90's, and would normally have been fitted to a 90cm CM dish. All decommissioned around 2004.
Thanks this is a uplinking kit from the late 90s
IMG_2972.JPG IMG_2973.JPG



I have the NJRC uplinking kit and LNBs in the shed if you are interested (all High Ku 12.5 GHz from memory but can check over the weekend).

The feeds will work on all frequencies though
Thanks for the offer I have a few now.
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
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My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK South
#74
I wasn't going to try selling them to you as they are licensed products, but if you want the specification of the system they used to be sold as (a complete system )
 
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#75
I wasn't going to try selling them to you as they are licensed products, but if you want the specification of the system they used to be sold as (a complete system )
Thanks again. would certainly be interested in the speciation if you have links etc, over the years ive collected various parts myself, do like reading and learning new things thanks
 

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
24,297
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5,190
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK South
#76
Thanks again. would certainly be interested in the speciation if you have links etc, over the years ive collected various parts myself, do like reading and learning new things thanks
OK, the original system was Eutelsat approved (EA-V021), a cross pol VSat system using a small Gilat tranceiver (o.5W) and NJRC LNB on a 90CM dish

Approval was removed around 10 years ago, but the Gilat equipment I believe was already out of manufacture before 2003.

Successor (AN-3422-02) as per below

Gilat Satellite Networks Ku-BAND ODU transmitter p/n AN-3422-02 noise converter

System performance for approval.

Average G/T - 19.4 dB/K , Max uplink EIRP - 41 dBW / 4 kHz
 

nelson_b

Contributor
Messages
1,524
Likes
1,378
My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#77
Hello nelson, it came as a unit OMT and feed horn, no lnb but will get some, friend spotted it and bought it on my behalf £43 :)

Post some pictures when you find it please.
Hi -
Different piece of kit ..... pictures as promised .... :)

1.jpg 2.jpg 3.jpg 5.jpg
 
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My Location
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#78
Hello nelson, anything to report. tests compared to the 1.8 dish ? any gained frequencys etc ?
 

nelson_b

Contributor
Messages
1,524
Likes
1,378
My Satellite Setup
Strong 4375 driving 1.8 C.M. offset + Inverto Black Ultra twin + BSC 421 and Zinwell C band l.n.b.,s - DR HD F15 - TM5302 and Skybox/Openbox M3 - HD receivers.+ other dishes in use - 2.4 CM offset - Alcoa 1.8 P.F. - C.M. 120.
My Location
north west yorkshire
#79
Hi --- @blademedia
I had forgotten about this .. :-doh ... i did set this up on the 2.4 one day at the end of november ..
nothing gained though ... most transponders i tried were a couple of db down on my current setup ,
the l.n.b i used was from an rather old co rotor that i have, and probably is poor compared to anything current ... i have borrowed(from Vipersan) another l.n.b. again from an old co rotor just to compare to the one i used .. but due to poor weather and work prior to xmas i,v not had time to give it a try ... things happen slowly here sometimes :)