DoktorOfSat presents: C Bandit's teeth

**doktorofsat** · 2 Weeks Ago

Here it is my new C band project;

C Bandit's teeth

Some russian freak use 3,5-4mm Al wire in order to make some powerfull depolarisers.

My ideea is to replace the classic Al wire with yellow Cu wire (80%Cu 20%Zn) which has superior electric

properties!

Is very hard at da first look to put in a row all pieces of wire.But I solved this problemo cuting a 2-3mm
ditch.

I cut an 3 mm wide strip from a card and using a clamp i fixed them on the strip

I'll continue the work on the the following days

Here are some photo:

***BombedOne*** · 2 Weeks Ago

It will lead you to nowhere.

As you may find on OTHER russian forums, that "russian freak" is falsely advertisting super capabilities of such depolariser (because he SELLS them, for quite high price ). It was tested on profesional equipment, and only shown some marginal improvement on certain TPs, but heavy decrease of signal on another TPs (article was published in respectable sat magasine)

***Vipersan*** · 2 Weeks Ago

Originally Posted by doktorofsat

Here it is my new C band project;

C Bandit's teeth

Some russian freak use 3,5-4mm Al wire in order to make some powerfull depolarisers.

My ideea is to replace the classic Al wire with yellow Cu wire (80%Cu 20%Zn) which has superior electric

properties!

Is very hard at da first look to put in a row all pieces of wire.But I solved this problemo cuting a 2-3mm
ditch.

I cut an 3 mm wide strip from a card and using a clamp i fixed them on the strip

I'll continue the work on the the following days

Here are some photo:

I wish you luck with this new project ...but I would imagine mounting the 2 sets of teeth inside the feed horn will be nothing short of a nightmare ..
Im guessing the teeth have to remain isolated from the metal of the feed horn throat or the elements might not resonate...
I await pictures of the finished item(s) 'mounted' with interest and curiosity.
rgds
VS

**Satcom1** · 2 Weeks Ago

Originally Posted by doktorofsat

Here it is my new C band project;

C Bandit's teeth

Some russian freak use 3,5-4mm Al wire in order to make some powerfull depolarisers.

My ideea is to replace the classic Al wire with yellow Cu wire (80%Cu 20%Zn) which has superior electric

properties!

Is very hard at da first look to put in a row all pieces of wire.But I solved this problemo cuting a 2-3mm
ditch.

I cut an 3 mm wide strip from a card and using a clamp i fixed them on the strip

I'll continue the work on the the following days

Here are some photo:

If this does prove workable. Then next step might be to drill and tap feedhorn for 2mm machine screws. This would allow them to be adjustable .

**doktorofsat** · 2 Weeks Ago

I made several tests with this teeth and I got mid results.Not bad , but under my exceptations.After that I add a central plate to it.This system is now in my lnb and I can say that it has a much better stability .I realised that 'cause now it's raining and I can watch 64E for example with stable picture and with the dielectric plate I can't .Noticed that also on 80E and some tp on 90E i got better signal

I'll made some more tests

***Vipersan*** · 2 Weeks Ago

Nice Job Doktor ..
I noticed you applied an insulated backing strip to each set of teeth ..to prevent contact of the elements with the metal interior of the feedhorn ..
I had the same idea as Satcoms ..regarding drilling the feedhorn and sliding elements in the holes sideways ..thus making each tooth ajustable....and am curious if connecting the base of all the teeth to a common metal ground would render the array useless ...or in fact improve the signal gain once the teeth were tuned..
Perhaps this would make for an interesting experiment..
rgds
VS

***BombedOne*** · 2 Weeks Ago

I already told you...

and tried all this sheet long time ago.

Nothing works as magically as dish size increase

With larger dish you don't need depolariser at all.

***Vipersan*** · 2 Weeks Ago

Originally Posted by BombedOne

I already told you...

and tried all this sheet long time ago.

Nothing works as magically as dish size increase With larger dish you don't need depolariser at all.

I couldn't agree more BombedOne ..
Unfortunately in built up urban areas such as where I live ..councils don't take kindly to installing monster sized dishes ...so you can understand the need to squeeze every last bit of gain out of what we have already got..
There is no question in my mind that experimentation with various methods of polarization has yielded benefits for my setup ...and I suspect a few on this thread might agree.
For example ..I considered it a minor miracle when shaping a piece of polyethylene gave me a 50% ++ gain accross the spectrum ...allowing me to pull in transponders considered inaccessible for my dish size.
I applaud anyone who is prepared to attempt the unusual..
Though I won't deny I'd luuurvvv to own a 3 mtre + pf dish

rgds
VS

**Channel Hopper** · 2 Weeks Ago

Originally Posted by BombedOne

I already told you...

and tried all this sheet long time ago.

Nothing works as magically as dish size increase With larger dish you don't need depolariser at all.

Err no. opposite polarities still need a depolariser of some type.

**Channel Hopper** · 2 Weeks Ago

Originally Posted by Vipersan

I noticed you applied an insulated backing strip to each set of teeth ..to prevent contact of the elements with the metal interior of the feedhorn ..
I had the same idea as Satcoms ..regarding drilling the feedhorn and sliding elements in the holes sideways ..thus making each tooth ajustable....and am curious if connecting the base of all the teeth to a common metal ground would render the array useless ...or in fact improve the signal gain once the teeth were tuned..
Perhaps this would make for an interesting experiment..
rgds
VS

You might recall a certain olde worlde Ku band mechanical polariser that your wife threw out.........

***Vipersan*** · 2 Weeks Ago

Originally Posted by Channel Hopper

You might recall a certain olde worlde Ku band mechanical polariser that your wife threw out.........

Fair comment CH ...but what you fail to factor in is ...
a) I no longer have the polariser to examine ...and ..
b) I'm now full of Guinness....so very little makes sense atm..
Hic !!!

**Satcom1** · 2 Weeks Ago

Originally Posted by Channel Hopper

You might recall a certain olde worlde Ku band mechanical polariser that your wife threw out.........

Explanation of Women vs Men.

Doktorofsat- Your (C Band Teeth) elements are way lower in frequency then the small foil strips.

***Vipersan*** · 2 Weeks Ago

Absolutely excellent explanation of genetic difference between Male and Female of the human species ..in pictorial form.

Satcom

***BombedOne*** · 2 Weeks Ago

If sirs still are stubborn, I can shoot a video, showing reception of circular polarised signals with plain LNB.

**doktorofsat** · 2 Weeks Ago

Originally Posted by BombedOne

If sirs still are stubborn, I can shoot a video, showing reception of circular polarised signals with plain LNB.

BombedOne I know this fact!!

When the signal from the C bad bird is strong enought for the dish you can easily got circular (L,R) polarizations without using any dielectric

I tried at the begining of my C-band receptions on 90E, 49E , 40E ,5W with nice results

o my 150cm dish

The most importat thing is the You need at least 40-41 dBW for an 150cm dish to get this circular polarizased tp

Best regards
DoktorOfSat

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DoktorOfSat presents: C Bandit's teeth Discussion of C-Band reception for Europe and beyond

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