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Fringe Reception General
Cooling the LNB
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<blockquote data-quote="dreadnutz" data-source="post: 1063403" data-attributes="member: 324947"><p>OK folks I took some pictures. I looked around to see if I still had the LNB and found nothing. I must have dumped it when I dumped the compressor unit. Both had been sitting outside under some plastic covers and had taken a real beating from the weather. Funny enough I just dumped them four months ago when I was trying to make space for the 3.8M dish project. I am now really upset that I did not at least take some pictures.</p><p></p><p>So here is where the Drying unit is today, on the pole of my new 3.8M dish. It is inside my second utility box which I put up in case I ever needed space for more equipment. I took these pictures today in case it ever gets gutted and the parts thrown out.</p><p></p><p>Keep in mind this was a PROTOTYPE! If something works I typically rebuild it to fix issues and make it more Durable.</p><p>The box at the back is the drying system</p><p></p><p>[ATTACH=full]121141[/ATTACH]</p><p></p><p></p><p>Cover removed! Excuse the mess but this has not been touched in 5 years.</p><p>[ATTACH=full]121142[/ATTACH]</p><p></p><p></p><p>Inside the Unit:</p><p>[ATTACH=full]121143[/ATTACH]</p><p>Operation is fairly simple.</p><p> The Aquarium pump I bought has variable output. At top of the drying beads is a T connection, One side goes to a solenoid to shut off any air from escaping and then it goes to the pump. The other side goes to a tunable pressure switch at the bottom right. It that can detect small changes in air pressure. The pressure value is done using the knob in the front of it and allowed very small amounts of positive pressure to be set and detected.</p><p></p><p>The output of the drying bead cylinder goes directly to the thin hose that connects to the LNBs internal case. If pressure drops in the hose as in the LNB leaks out small amounts of air, typically over a 30 minute period the pressure sensors diaphragm flattens and activates the internal switch which then turns on the pump and solenoid and blows air into the drying bead chamber and out to the LNB. Once the pressure is correct (1-2 seconds of pumping) the pressure switch shuts off the pump and solenoid.</p><p></p><p>Another Angle:</p><p>[ATTACH=full]121144[/ATTACH]</p><p></p><p></p><p>Dry Air Output and Cooling system exhaust</p><p>[ATTACH=full]121145[/ATTACH]</p><p></p><p></p><p>Cooling Fan:</p><p>I had originally made my first prototype used two high powered Peltier devices. So I used a Power supply I had lying around. Peltier cooling was a complete waste of time as I could never get the LNB even near 0c on my bench desk. So it was ditched but I used the same power supply and had already built a cooling tower to pull out the hot air that rose to the top.</p><p></p><p>[ATTACH=full]121146[/ATTACH]</p><p></p><p>I wish i had more parts of the whole system to show you guys. Had this worked the next step would have been a much larger air drying cylinder which I had already built and still have. The power supply would have been removed in favor of a smaller unit.</p><p></p><p>I took a lot of pictures of the 3.8M Prodelin restoration. I am going to create a separate thread for that in the coming days.</p><p></p><p>RJG</p></blockquote><p></p>
[QUOTE="dreadnutz, post: 1063403, member: 324947"] OK folks I took some pictures. I looked around to see if I still had the LNB and found nothing. I must have dumped it when I dumped the compressor unit. Both had been sitting outside under some plastic covers and had taken a real beating from the weather. Funny enough I just dumped them four months ago when I was trying to make space for the 3.8M dish project. I am now really upset that I did not at least take some pictures. So here is where the Drying unit is today, on the pole of my new 3.8M dish. It is inside my second utility box which I put up in case I ever needed space for more equipment. I took these pictures today in case it ever gets gutted and the parts thrown out. Keep in mind this was a PROTOTYPE! If something works I typically rebuild it to fix issues and make it more Durable. The box at the back is the drying system [ATTACH=full]121141[/ATTACH] Cover removed! Excuse the mess but this has not been touched in 5 years. [ATTACH=full]121142[/ATTACH] Inside the Unit: [ATTACH=full]121143[/ATTACH] Operation is fairly simple. The Aquarium pump I bought has variable output. At top of the drying beads is a T connection, One side goes to a solenoid to shut off any air from escaping and then it goes to the pump. The other side goes to a tunable pressure switch at the bottom right. It that can detect small changes in air pressure. The pressure value is done using the knob in the front of it and allowed very small amounts of positive pressure to be set and detected. The output of the drying bead cylinder goes directly to the thin hose that connects to the LNBs internal case. If pressure drops in the hose as in the LNB leaks out small amounts of air, typically over a 30 minute period the pressure sensors diaphragm flattens and activates the internal switch which then turns on the pump and solenoid and blows air into the drying bead chamber and out to the LNB. Once the pressure is correct (1-2 seconds of pumping) the pressure switch shuts off the pump and solenoid. Another Angle: [ATTACH=full]121144[/ATTACH] Dry Air Output and Cooling system exhaust [ATTACH=full]121145[/ATTACH] Cooling Fan: I had originally made my first prototype used two high powered Peltier devices. So I used a Power supply I had lying around. Peltier cooling was a complete waste of time as I could never get the LNB even near 0c on my bench desk. So it was ditched but I used the same power supply and had already built a cooling tower to pull out the hot air that rose to the top. [ATTACH=full]121146[/ATTACH] I wish i had more parts of the whole system to show you guys. Had this worked the next step would have been a much larger air drying cylinder which I had already built and still have. The power supply would have been removed in favor of a smaller unit. I took a lot of pictures of the 3.8M Prodelin restoration. I am going to create a separate thread for that in the coming days. RJG [/QUOTE]
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Cooling the LNB
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