Dish clearance for a flat metallic roof


Conrad, PA5Y
 

Hello all. I have a roof mount (tagelvoet) that uses 60 x 40 x 5mm concrete tiles for ballast. The ballast weight is approximately 108kg

My intention is to mount the dish and mount on top of a flat metal shipping container that I use for storage. It is clear in the direction of the satellite. I have a Triax TDS 110 offset fed dish. The standard pole for this roof mount is 70cm long which means that the lower edge of the dish will be around 40 cm above the metal roof and around 1.5m from a wall to the West of the dish.

 

How much clearance do I need? The 3dB BW is 1.6 degrees according to the datasheet.

 

I have no idea what is ‘safe’, I don't want to pick up noise from the container my questions are due to a lack of experience with offset dishes and 10.5GHz, maybe I am over thinking things?

 

Thanks in advance.

 

73

 

Conrad PA5Y


Dave G8GKQ
 

Hi Conrad

No problems with that installation.  Received noise should not be a problem - the transponder noise level should be well above local overspill noise.

The only thing that you need to consider is the EMF levels getting past the edges of the dish, but even at DATV power levels (50 -100 W) these are within safe limits a metre or 2 behind the dish.

Dave
G8GKQ


Conrad, PA5Y
 

Thanks Dave, I have no intention transmitting on the WB uplink. I may at some point see if I can  decode signals but I am mainly interested in the NB transponder. One thing at a time.

 

Conrad

 

From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Dave G8GKQ via groups.io
Sent: 01 February 2023 11:20
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dish clearance for a flat metallic roof

 

Hi Conrad

No problems with that installation.  Received noise should not be a problem - the transponder noise level should be well above local overspill noise.

The only thing that you need to consider is the EMF levels getting past the edges of the dish, but even at DATV power levels (50 -100 W) these are within safe limits a metre or 2 behind the dish.

Dave
G8GKQ