Can we use polycarbonate plate instead of teflon ?

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Brct203

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Dec 24, 2016
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actually, while I know it's often called teflon, is it really teflon that is commonly used?
All the dielectric plate that I've used for circular C-band looked very much like printed circuit board stuff (fiberglass-reinforced epoxy resin), just a lot thicker than a PCB. And recently I had to file the edges of a plate I got with my Titanium LNBF to fit it in an old Polarotor, and filing it produced the exact same smell as you get when drilling/cutting a PCB board.
Also, I think I have seen a Dish Network LNBF that used a transparent dielectric plate - so maybe it was polycarbonate.
 

AceB

SatelliteGuys Family
Aug 1, 2011
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Sussex, UK
We've made plates out of a few different materials with good results, sometimes upto 1dB stronger than the usual supplied slab. Both CD cases and a nylon chopping board can make very effective plates.

diplate1.jpg
diplate2.jpg
diplate3.jpg
 
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john_robot

Thread Starter
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Feb 24, 2008
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Hi, Do you have the measurement details of the metal plates that you have on the plastic plate ?
 

AceB

SatelliteGuys Family
Aug 1, 2011
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48
Sussex, UK
Hi, Do you have the measurement details of the metal plates that you have on the plastic plate ?
John, let me ask the guy that made the one I'm using, it may take a few days to get a reply from him but I'll let you know what he says.
 

Brct203

SatelliteGuys Pro
Dec 24, 2016
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Connecticut
John, let me ask the guy that made the one I'm using, it may take a few days to get a reply from him but I'll let you know what he says.
cool, i'm interested too. Is that a copper-clad printed circuit board that was etched with that specific pattern? Or is it adhesive copper on a polycarbonate board from a CD case?
 

AceB

SatelliteGuys Family
Aug 1, 2011
48
48
Sussex, UK
I've heard back from him and have the diagram. He's currently experimenting with the design and adding some extra lengths of copper wire to each copper plate, hopefully he's going to send me a photo to show what's he done but he says he's improved some transponders by over half a dB so I'll update as and when I get something.

The plate itself is made from a CD case, no idea what type of plastic that is but he just dremmels out the size required to snug fit in the LNB and you'll see it's made slightly longer than required. I don't know where he sourced the copper from but it comes on a sheet and is self adhesive.

I've placed a couple of strips of PVC tape down each side of mine just to give it a cushion as it's slid into the LNB and the position within the throat is quite sensitive so trial and error to find the best location. Mine is with the upper most copper strips about 10MM from the front of the throat.

plate.jpg
 
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