2.4 Channel Master Offset

nelson_b

nelson_b

Contributor
Messages
1,729
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
Additional info --
of the 2 transponders that have signal on both polarities there is a about 0.2 db difference of strength between the polarity on both frequencies ...

now it gets a bit weird
if i scan in using the stronger polarity reading on 12149 i get the 24 channels that i should get from that t.p. .. if i scan the weaker polarity on 12149 i get the 7 channels that should scan in from 12130

the same thing happens in reverse if i scan 12130 the stronger polarity brings in the 7 channels that should appear.... and the weaker polarity pulls in the 24 channels from 12149

12092 is normal and only has signal on one polarity and pulls in the 26 channels that it should do

make of this what you will ... i,v never had this happen in circular C band :eek:
 
RimaNTSS

RimaNTSS

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5,003
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Some SAT-related hardware.
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N-E from Riga
Folks, when you are experimenting there with Ku-circular and you feel the need for usual LNBFs used to receive signals from 36*E, I could help to get those LNBFs and send them to you.... should not be so expensive.
 
nelson_b

nelson_b

Contributor
Messages
1,729
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
Folks, when you are experimenting there with Ku-circular and you feel the need for usual LNBFs used to receive signals from 36*E, I could help to get those LNBFs and send them to you.... should not be so expensive.
Thank you RimaNTSS .... Maybe ...... do you think results would be any different ?
i,v used 2 different l.n.b,s and feeds with identical results 5.jpg

C.J. sent me one of these to try last year6.jpg 7.jpg 8.jpg
but it did not travel well and was dead on arrival so pulled the cap off to view inside .
 
RimaNTSS

RimaNTSS

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My Satellite Setup
Some SAT-related hardware.
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N-E from Riga
do you think results would be any different ?
I do not know, but ~10 EUR (including shipment) is not so much to prevent trying.
 
nelson_b

nelson_b

Contributor
Messages
1,729
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
I do not know, but ~10 EUR (including shipment) is not so much to prevent trying.
Indeed that would be a cheap experiment :)
will speak further tomorrow ... been a long day today .. feeling tired right now :blink:
 
B

blademedia

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Sky
My Location
UK
Instructions from my channel master one
IMG_4043.JPG
 
nelson_b

nelson_b

Contributor
Messages
1,729
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
B

blademedia

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Messages
1,941
My Satellite Setup
Sky
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UK
Thanks B.M. ... be interested to see what your setup makes of receiving these t.p. frequencies .. if you get time to try at some point :)
I had a quick look here a few weeks ago, I was getting one of the Russians transponders with no plate in, weather conditions was also poor at the time of checking , I will have a better look when I'm more organised.
 
Trust

Trust

Specialist Contributor
Messages
930
My Satellite Setup
1.8 m CM at SMR 1224 + Elev. with 7 lnb changer Ku (lin - circ) - Ka (lin - circ) C (lin - circ)
My Location
Nijmegen Netherlands
nelson_b

nelson_b

Contributor
Messages
1,729
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
I do not know, but ~10 EUR (including shipment) is not so much to prevent trying.
ok .... why not :) i will message you later today for payment details etc
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
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My Satellite Setup
Some SAT-related hardware.
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N-E from Riga
@nelson_b When you do experiments on your 2.4m CM dish in Gregorian design (with sub-reflector) do not forget that Left becomes Right and vice-versa. But I am sure you know that.
 
nelson_b

nelson_b

Contributor
Messages
1,729
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
@nelson_b When you do experiments on your 2.4m CM dish in Gregorian design (with sub-reflector) do not forget that Left becomes Right and vice-versa. But I am sure you know that.
Yes, i have become used to that now ... but it did throw/puzzle me a few times at first :)
 
scopus

scopus

Specialist Contributor
Messages
2,217
My Satellite Setup
Primesat/Famaval 1.8 PF C/ku/Ka, Octagon SX8HD1, SX88, Openbox S3 Mini HD-V8S Freesat V7 HD-V8 Finder, Amiko A4K Combo, Satlook Colour HD Spectrum, Sansui A909 Amp and BOSE Acoustimass speakers for the audio.
My Location
Staffs UK
nelson_b

nelson_b

Contributor
Messages
1,729
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
HI -
Made up some "temporary" arms for the 2.4 c.m. to see how it performed in k/u without its subreflector and dedicated feed ... played around for a while using a normal channel master feed and C120 l.n.b.
results at Amos 4 west were decent - but about 1.0 db down from subreflector results on 11176 H 30000
swapped the l.n.b. for a standard Black ultra single and gained back most of the loss
8.0 to 8.1 db with sub .... 7.9 to 8.0 with black ultra ..... spurred on by this i ran a 2 MHz blind scan with the F15 at Amos 4 West and turned up 1 middle east beam transponder.
The idea to run the dish without a subreflector is that i might then be able to fit 2 C band l.n.b,s either side of the k/u as this arrangement has served me well on the 1.8 .. which would be replaced by the 2.4 setup if the results are good enough ....

1.jpg 2.jpg 3.jpg 4.jpg
 
shriarun

shriarun

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Messages
17
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Hotbirds ..eutelsat9.. Arabsat..Yahsat..Asiasat..Insat2e..Intelsat..Measat
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india
hi Nelson sir..i just joined this great forum as i really found it very helpful to me in satellite regarding matters...sir i too find out same Channel Master 2.4 parabolic dish..unfortunately it is without any accessories only reflector....i have read all your posts where you are hailing this great dissh...i need your help to make its front focal length pipe and arms....back panel is not challenging i just need help to make front pipes....i hope u will really help me to define me its acurate lengths..

thanks....in waiting of your best feedback
 
william-1

william-1

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Epping Forest
My Satellite Setup
OP Gibertini 100 XP+ Inverto Black Ultra 0.2
Superior Dark Motor (160° max)
(50 east to 34.5 west)
TM6902HD (A/B switch) Octagon SX88+Optima

Raven 88cm Mesh Dish + TM-1 0.1
Stab100 H to H (120° max)
(53 east to 45 west)
Octagon SX88+ (A/B switch) Edision S2

45cm dish V8 Golden 28E FreeSat Quad Lnb
Virgin Media FreeSat
My Location
Epping Forest Essex
hi Nelson sir..i just joined this great forum as i really found it very helpful to me in satellite regarding matters...sir i too find out same Channel Master 2.4 parabolic dish..unfortunately it is without any accessories only reflector....i have read all your posts where you are hailing this great dissh...i need your help to make its front focal length pipe and arms....back panel is not challenging i just need help to make front pipes....i hope u will really help me to define me its acurate lengths..

thanks....in waiting of your best feedback

Welcome to satellites.co .UK
shriarun
I hope you find what you are looking for.
 
shriarun

shriarun

Member
Messages
17
My Satellite Setup
Hotbirds ..eutelsat9.. Arabsat..Yahsat..Asiasat..Insat2e..Intelsat..Measat
My Location
india
Welcome to satellites.co .UK
shriarun
I hope you find what you are looking for.
sir i need focal pipe length u know well centre pipe and side arms length...if you dont mind share via posts publically here or on my mail address...i know your are the right person who will surely help me...
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
29,905
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A little less analogue, and a lot more crap.
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UK
No email address (to save you getting stung by Nigerians).

Do you have the domestic or professional version of the CM dish ?
 
shriarun

shriarun

Member
Messages
17
My Satellite Setup
Hotbirds ..eutelsat9.. Arabsat..Yahsat..Asiasat..Insat2e..Intelsat..Measat
My Location
india
No email address (to save you getting stung by Nigerians).

Do you have the domestic or professional version of the CM dish ?
its my personal set up..i have already prodoline 1.8 parabolic dish on some euorpen sats ..by luck my long waited desire has been fulfilled as i found out CM 2.4..But only surface..a day after i will upload pics ...
 
nelson_b

nelson_b

Contributor
Messages
1,729
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
hi Nelson sir..i just joined this great forum as i really found it very helpful to me in satellite regarding matters...sir i too find out same Channel Master 2.4 parabolic dish..unfortunately it is without any accessories only reflector....i have read all your posts where you are hailing this great dissh...i need your help to make its front focal length pipe and arms....back panel is not challenging i just need help to make front pipes....i hope u will really help me to define me its acurate lengths..

thanks....in waiting of your best feedback
Hi There

I did make temporary arms a few years ago for testing - from measurements that were given to me by a forum member on here. but he is now no longer a member .... i should still have those measurements on my p.c. somewhere - so will try to find them ... if you are wanting to make your own

There is a company in the u.k. called - Satellite Superstore - in the u.k. who sell them and the l.n.b. holder etc --- But they are pretty expensive to buy .... if you Google search that company name and look on their site you would find the arms etc under spare parts for 2.4 Raven dish.
Raven is the new name for all the old Channel master kit.

On this forum - member @RimaNTSS has made a very nice design of l.n.b. holder from stainless steel for channel master dishes that is dual purpose and can be used for k/u band or C band l.n.b,s ... my self and other members here have bought them from him ... they are very good. and i know he has made arms for his own dishes so may be able to give you help with the measurements etc ... if i cant find them here on my p.c. .... its been a while since i needed them - as i,m using the metalwork that came with my dish that supports the sub reflector arrangement again now and the side arms are a different length and design to the regular ones that you are most likely looking for .

It sounds from your post that you have just the large dish reflector and no metalwork or sub reflector.

regards ...
 
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