Channel Master/Laminas 1.8m project

scopus

scopus

Specialist Contributor
Messages
2,211
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
Yes, I can do that, I see what you mean...
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
IMHO: Existing safety-chain connection of @scopus is OK. Just remember that it is there in case the actuator breaks. If actuator eye breaks than the bolt, holding it to the frame will still be there and chain will hold the dish in any case. But if you wish to make something just connect the safety-chain connect it to existing hole.... do not make new one.
 
scopus

scopus

Specialist Contributor
Messages
2,211
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
IMHO: Existing safety-chain connection of @scopus is OK. Just remember that it is there in case the actuator breaks. If actuator eye breaks than the bolt, holding it to the frame will still be there and chain will hold the dish in any case. But if you wish to make something just connect the safety-chain connect it to existing hole.... do not make new one.
Yes, I was think along the same lines, really just in case the actuator decides to break. It is a heavy duty Superjack, not expecting to go , but you never know, a belt and braces exercise..
 
D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
Hallo! Very nice posts here! Very inspirating pictures and informations. This summer i bought Channel Master 180 and next Spring i want to make the stand for the dish. Do you have some schema of polar mount? I can make it myself or put it to firma. Thank you for help :-)
 
Captain Jack

Captain Jack

Модератор
Staff member
Messages
10,982
My Satellite Setup
See signature
My Location
North Somerset
Do you have some schema of polar mount? I can make it myself or put it to firma.
No, it's an old Precision PM that would have come with a 2.2m dish. The only thing I added is the declination control but adding some metal work.
 
D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
Yes, Thank You, but i mean generally, exists somewhere schema of polarmount for big dishes? :-) I need one.
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
Generally, there are maybe many designs of the PMs for PFAs and offset dishes. I had 1.8m PFA installed on this PM (majority made of INOX). Dish is gone to another place, namely to the ceiling of the garage to work as decoration. But polar-mount is still laying around and if you wish, I can find it and we could make a bargain deal.
 

Attachments

D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
Thank you RimNTSS. Sorry, i didn´t write - i have fiberglass Channel Master Offset Dish 185x200 cm with original feedhorn. Weight is about 100 kg, so it has to be something heavy duty:-) It is the same dish like CJ shows here in threat on photos.

Im thinking about something like what is on enclosed the picture. Of course absolutly much more robust (this was very popular polarmount here in CZ for dishes to 120 cm). I don´t know if could be possible to do something like that for so heavy dish like CM180 is... it is only idea...

I like this http://www.primesat.eu/pimages/raven18mot05lg.jpg and need dimensions or is it realy so simple like on the picture from Primesat? I have no experiences with so heavy and big dishes, i have only 120cm Alu on Diseqc motor and this big dish want to install in spring.
 

Attachments

RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
No problem @dishdx . You probably have Channel Master 1.8m antenna with working area 1800x1950mm, offset angle 22.62* and opening angle 80*. 100 kilos..... well, it is too much.... mirror weights not more than 35 kilos. I have such a dish as well, so I know what I am speaking about. The picture of the polar mount you showed is a good example to replicate. raven18mot05lg.jpg So, if you have time til spring you can order such a polar mount in the local metal workshop. I do not think it will be so difficult to make one. Just show them the picture.
 
D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
Yes, Thank You. But how could be the range of such polarmount? Can it rotate from 40W to 90E like diseqC motor?
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
I think, depending on the fixing points of the actuator, the range of any polar-mount, including this one, can be more or less H-H. So, yes, like Diseqc motor.
 
D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
ok! it could be good. I have original very robust metal holder of LNB and the holder of the dish. I have to look, what could be possible to i think that this parts (dish holder and lnb holder) are connected.... i have to do some test with wooden prototype on small 60cm dish :-)
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
this parts (dish holder and lnb holder) are connected.
Sorry, I do not get that. :( That might be my language issues. Could you show some pictures of what you have?
 
D

dishdx

Member
Messages
109
My Satellite Setup
Showbox Vitamin, Octagon SX88
Dishes: Offset motorised 120 cm 40W-75E IBU Twin, Channel Master 180 78.5E-30W manual rotate , Cahors BigBisat 8 x Alps 1W,5E,9E,13E,19E,23.5E,28.2E,39E. Planty of equipments for FM and AM DX.
My Location
Central Bohemia
Yes, i will take a few photos at the weekned, it will be better :-)
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
Weekend!!!! I take and post photos within 10 minutes :rolleyes: . Do not worry, just take your time. Sometimes I am just kidding.
 
S

samoloko

Specialist Contributor
Messages
409
My Satellite Setup
1.8 PFA
My Location
EU
100 kilos..... well, it is too much.... mirror weights not more than 35 kilos. I have such a dish as well, so I know what I am speaking about.
mirror only Is 47 kg
 
Channel Hopper

Channel Hopper

Suffering fools, so you don't have to.
Staff member
Messages
29,667
My Satellite Setup
A little less analogue, and a lot more crap.
My Location
UK
Yes, Thank You. But how could be the range of such polarmount? Can it rotate from 40W to 90E like diseqC motor?
The range of such a mount will be determined by the distances of the two bearings from the central polar turning point and the length of the actuator arm. Basically the longer of each the better, the number of counts per degree improves and there is less stress on the motor gearbox and the bearings.

There are caveats though, you need a larger space behind the dish, and the tracking speed between satellites will slow accordingly .

Personally I would consider the polarmount from IRTE in the 90's/00's to be about the best available. Very heavy galvanised parts, adaptable and virtually unbreakable, but the disadvantage is a fixed diameter post of approximately 110/115 mm.

Wayback Machine

They are no longer made, but crop up every now and then on the usual auction sites
 
RimaNTSS

RimaNTSS

Super Moderator
Staff member
Messages
4,990
My Satellite Setup
Some SAT-related hardware.
My Location
N-E from Riga
TBH, I did not weight CM 1.8m but I weighted NSC 1.8m reflector (it is bigger and heavier than CM 1.8m), and weight was 36.5 kg. There is screenshot where 30kg mentioned for CM 1.8m ScreenHunter_511 Nov. 29 17.54.jpg
 
Top