C Band back on the 1.8 Channel Master

[scopus]

I've been playing again, this time strapped the C Band LNB at the side of the Ku on the CM, so have to lift the dish to get it into focus. Results are good, BBC Africa Feed locks just fine, been round to 40E and got lock there OK same at 5W, more loctaing to be done. The dish is a very mini version of VSs dish now...lol

 

[Journey]

I've been playing again, this time strapped the C Band LNB at the side of the Ku on the CM, so have to lift the dish to get it into focus. Results are good, BBC Africa Feed locks just fine, been round to 40E and got lock there OK same at 5W, more loctaing to be done. The dish is a very mini version of VSs dish now...lol

Scopus, thank you for the post and the photos

Can i ask you, the feedhorn that seems to be above the normal centralised lnb, is this an off the shelf bracket you purchased or something that you made yourself ?

 

[scopus]

It was a home brew bracket.

 

[Journey]

It was a home brew bracket.

Wish i had your skills, would love something like that for my cm 1.2

 

[scopus]

The bracket holding the Ku LNB is a universal aerial clamp attached to some studding. The C Band is a 65mm car exhaust clamp also attached to some studding, then attached to the dish arm with a electrical earth clamp.

 

[Captain Jack]

Can you take some closer up pictures? Also, are the arms in the way at all of the C LNB? Just thinking of putting two side by side just above the main LNB... To give me linear and circular. But worried about the arms.

 

[scopus]

The LNB clears the arms CJ. Will take some of my home brew bracket tomorrow.

 

[Archived-1]

I have an ingenious idea for all us channel master users, that will be a very easy fix, how do you have something patented .

 

[archive10]

I have an ingenious idea for all us channel master users, that will be a very easy fix, how do you have something patented .

well, for starters, you can't tell us.

For the patent to be awarded, there has to be no traceable examples of "prior art" (someone else inventing it), or release to the public (that's posting on this site) until your patent application has through, and you have been awarded the patent (in all affected territories and countries).

After this, you are then free to post lawsuits in the countries or territories where you suspect your patent is being violated.
You can sue e.g. UK resellers if they offer a product you think violates your patent, take them to court.
If someone in, say, China, makes *and markets in China* a device that violates the patent, you sue them locally in China (better get a good solicitor).

I assume you have very hefty resources to pay legel fees.
I also assume you are prepared to uphold legal battles lasting several year while the court and associated companies are deliberating and evolving the case in general.

With the successful completion of the legal proceedings to stop the infringing company to market and sell a device that violates your patent, you can then file a new lawsuit against the company to seek compensation for the damages done to your earnings (assuming you have been producing a similar device by then). This, of course, relies on the compnay infringing on our patent to still exist, and be solvent to pay your claims for damages...
In practice, the owner of the original company let the company go into liquidation, and creates a new (unrelated) company, that purchases the "intellectual property" (hardware designs, diagrams, software etc) from the old company, and then you have to restart the whole process...

*sigh*

Patents are worth diddly-squat to us normal people, they're only useful in Apple-against-Samsung, or Monsanto-vs-Pfizer.
Nobody wins, except the solicitors/lawyers, who are kept busy until the end of time...

 

[archive10]

Nobody wins, except the solicitors/lawyers, who are kept busy until the end of time...

Nevertheless, I am very keen on seeing your design ingeniouity... B-)

 

[Archived-1]

Blimey st1, I was only joking about the patent bit . you will wear your fingers out typing like that . but many thanks, I will have to see if it works first, but I am usually quite good at overcoming obstacles, I put it down to my main line of work kitchen fitting, there's all ways something you have to make fit and look good.

 

[archive10]

Blimey st1, I was only joking about the patent bit . you will wear your fingers out typing like that .

I know, my friend, I'm just particularly disillusioned with the way patents (don't) work. 8-Z
Fingers are in good form - typing on computer keyboards seem to be what I do fo a living (second only to speaking on the phone!)

(At some point, I will quit my job and write that book... but probably not before the kids are self-sustaining...)

 

[scopus]

Can you take some closer up pictures? Also, are the arms in the way at all of the C LNB? Just thinking of putting two side by side just above the main LNB... To give me linear and circular. But worried about the arms.

Some close up pictures CJ. Hope it helps...

 

[Captain Jack]

Great stuff! What we need (and I am talking to you, @st1, @martin-f, @RimaNTSS) is a 3D design of some bracket, which would allow the side arms to be moved down to allow extra LNBs to be put on.

Then anyone can take it and print it

 

[Journey]

What CJ said +1

 

[RimaNTSS]

@scopus Nice piece of engineering! Quiet complicated. ;)
It is well known that all those nice old dishes were designed for only one LNB and side arms are making some shedding. And if someone is trying to put additional LNBs on the same feedarms, than on the way from those LNBs towards the dish feedarm obstructing signal. And that is not good at all.
The best way to make multifeeds IMHO is making completely new feedarms.
That is what I made last summer for my Prodelin 1,8m. Side-arms have threaded bar inside, so can be extracted to any size (yellow circles) . Bottom feedarm, depending on length of side-arms and their connection place, can be fixed at any angle.
If we know the position of the Focal point (red dot) of the antenna (and we know it ), than it is not so difficult to place LNB in such a way that it's Phase center is co-located with antenna's Focal point.
It was not my goal to make multifeed on my antenna, but I do not see any problems to put horizontal bar (green) and attach more LNB-holders.

 

[RimaNTSS]

And for LNB holders there are some examples. Clamps are 40mm, but also possible 65mm.

 

[scopus]

@scopus Nice piece of engineering! Quiet complicated. ;)
It is well known that all those nice old dishes were designed for only one LNB and side arms are making some shedding. And if someone is trying to put additional LNBs on the same feedarms, than on the way from those LNBs towards the dish feedarm obstructing signal. And that is not good at all.
The best way to make multifeeds IMHO is making completely new feedarms.
That is what I made last summer for my Prodelin 1,8m. Side-arms have threaded bar inside, so can be extracted to any size (yellow circles) . Bottom feedarm, depending on length of side-arms and their connection place, can be fixed at any angle.
If we know the position of the Focal point (red dot) of the antenna (and we know it ), than it is not so difficult to place LNB in such a way that it's Phase center is co-located with antenna's Focal point.
It was not my goal to make multifeed on my antenna, but I do not see any problems to put horizontal bar (green) and attach more LNB-holders.
View attachment 78591

Thanks Rima, I used to love meccano as a child;)

 

[CROSSBONES]

Nice to see Scopus being his helpful self as usual! How you keeping mate?;)

 

[nelson_b]

Thanks Rima, I used to love meccano as a child;)

Me too :-)
some pictures on the forum here somewhere of my own meccano efforts re, lowering the side-arms on my 1.8 cm - but cant locate them ? - not as sturdy looking as the ones you have made - but been on the dish a good 2 years now without problems -- might post them again if i still have them on my p.c.
cheers - nelson.