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Dishing it out - Page 4

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Posted by mscir on February 15, 2004, 2:24 am
 
Duane C. Johnson wrote:


How about placing a small high quality reflector that will not interfere
with the electronic signal between the LNB and the dish?


Posted by Glenn on February 15, 2004, 3:13 am
 
The LNB is to be protected (in the long term) by a solar (and microwave)
opaque object, that being the hotwater receiver, not yet in existence.

Anybody knowing of a reflector that passes microwaves and reflects
visible light and infrared would be graciously received.

Temp sensor is in the long term plan as a backup mechanism.

Glenn



Posted by Nick Pine on February 15, 2004, 11:36 am
 

It's easier to reflect microwaves and absorb heat and light. You might
put a 1/4" hardware cloth reflector (with a grid spacing that's small
compared to a microwave but large compared to a heat wave) between the
dish and the heat collector at the focus to reflect microwaves off to
the LNB, back near the dish, away from the focus...

How can you track the sun and watch TV at the same time?

Nick


Posted by Glenn on February 15, 2004, 1:04 pm
 I can't.   That's why its the H2O by day, HBO by night project :-). We
were discussing protection of the feedhorn electronics from solar BBQ.

Thanks,  Glenn



Posted by Duane C. Johnson on February 15, 2004, 3:54 am
 Hi mscar;

mscir wrote:

That's the problem, I think that for a surface to be
reflective with a mirrored surface it will always
reflect the microwaves. This is a property of mirrors.

On the other hand, the receiver could be a black
absorber of light and let the microwaves pass through.

Duane

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