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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
T plate ...Open T ....Hybrid T..
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<blockquote data-quote="Vipersan" data-source="post: 802645" data-attributes="member: 325666"><p>...and I'm not talking roses ..</p><p>I was lay in my pit just about to go to sleep last night ..cursing the fact that I had to climb ladders every time I wanted to switch from Linear to Circular..</p><p>Well For Dxing ..I still will ..but for more general viewing maybe not ..</p><p>Just tested my latest creation ..in the rain ...as it always is here ..</p><p>The Open T ..</p><p>I've long believed that circular signals can be depolarised outside the lnb throat ..So I wondered if I could use this fact in a positive way ..and decided to make an open T plate ..</p><p>Just like the standard T but with an open section inside the lnb to allow whatever linear signals manage to enter ..to be received and find their way to the correct probes...but without totally removing the ability to depolarise circular broadcasts..</p><p>Well ..it sort of works ..</p><p>Not a very scientific test ...but preliminary results show that around 90% of circular polarised signals are depolarised with sufficient gain to make them lock..including 2 of the stronger startimes transponders at 10 East..</p><p>signal loss is approx 1.5 to 2 db on circular signals..</p><p>So ..the acid test ...could I lock any linear transponders ..?</p><p>The answer is yes ..</p><p>Certainly some of the stronger ones ...about 40% of my stored channels including the weak transponder/mux ..Band international on 58 West..</p><p>Normally 6.8db ..</p><p>Drops to 5.5 db ..with the open T in place ..but still locks..</p><p>Not so consistent these linear figures ..</p><p>Some channels reduce by much more that 4db ..others only 1.5 to 2 db...</p><p>A bit hit n miss ..</p><p>But looks promising ...but I'll need to experiment some more to find an optimum compromise ..</p><p>So I'll have to get a stock of polyethylene cutting boards in to play with..</p><p>You'll also notice the cut-out is roughly the right size to take a DOS plate ..when suitable grooves are cut ...</p><p>So more experiments to come ..with what I shall call ..the Hybrid T...</p><p>My brain hurts ...cuppa T needed I think.</p><p>here are a couple of pics to give you an idea what I envisaged.</p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 802645, member: 325666"] ...and I'm not talking roses .. I was lay in my pit just about to go to sleep last night ..cursing the fact that I had to climb ladders every time I wanted to switch from Linear to Circular.. Well For Dxing ..I still will ..but for more general viewing maybe not .. Just tested my latest creation ..in the rain ...as it always is here .. The Open T .. I've long believed that circular signals can be depolarised outside the lnb throat ..So I wondered if I could use this fact in a positive way ..and decided to make an open T plate .. Just like the standard T but with an open section inside the lnb to allow whatever linear signals manage to enter ..to be received and find their way to the correct probes...but without totally removing the ability to depolarise circular broadcasts.. Well ..it sort of works .. Not a very scientific test ...but preliminary results show that around 90% of circular polarised signals are depolarised with sufficient gain to make them lock..including 2 of the stronger startimes transponders at 10 East.. signal loss is approx 1.5 to 2 db on circular signals.. So ..the acid test ...could I lock any linear transponders ..? The answer is yes .. Certainly some of the stronger ones ...about 40% of my stored channels including the weak transponder/mux ..Band international on 58 West.. Normally 6.8db .. Drops to 5.5 db ..with the open T in place ..but still locks.. Not so consistent these linear figures .. Some channels reduce by much more that 4db ..others only 1.5 to 2 db... A bit hit n miss .. But looks promising ...but I'll need to experiment some more to find an optimum compromise .. So I'll have to get a stock of polyethylene cutting boards in to play with.. You'll also notice the cut-out is roughly the right size to take a DOS plate ..when suitable grooves are cut ... So more experiments to come ..with what I shall call ..the Hybrid T... My brain hurts ...cuppa T needed I think. here are a couple of pics to give you an idea what I envisaged. rgds VS [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
C-Band Reception, UK and Europe
T plate ...Open T ....Hybrid T..
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