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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Depolariser
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<blockquote data-quote="Trust" data-source="post: 901597" data-attributes="member: 181524"><p>Trying some time ago to build the best C-Ku lnb combo , I noticed that a DE plate disturb the linear C and Ku signals . So I decided to make a 3 lnb changer , C-Lin - C-Circ and Ku .</p><p>For C-Circ the "bottle" depolariser with stubs was the most effective to my set-up .</p><p>However its performance change by the frequency , some signals improved by pulling the "bottle" a little bit out of the wavepipe .</p><p>Since the only at my location receiveble (120 cm dish) C-Lin signals dissapeared ( 10º E) there was no need for that lnb anymore . A Ka lnb could fill that place .</p><p>But to keep the possabillity receiving C-Lin in the future I (hopefully) develloped a way to receive both , C-cic and C-lin in one lnb by rotating the "bottle" in such position it dont interfear the Hor en Vert lin signals .</p><p>Also improvement of the Circ signals at different frequencys by turning it a little bit instead of pulling it out .</p><p>So I made a prototype but to test it I have put a set-up at a other location since more east as 46º I cannot receive by trees .</p><p>For the moment I use a small E-motor to a even small gear box , no feedback or end switches .</p><p>Finaly I intend to use a servomotor as used by RC cars and boats .</p><p>The gear ring around the wave pipe is made of a 63 mm PVC pipe adapter .</p><p>It was a hell of a job to make those 39 teeth to it .</p></blockquote><p></p>
[QUOTE="Trust, post: 901597, member: 181524"] Trying some time ago to build the best C-Ku lnb combo , I noticed that a DE plate disturb the linear C and Ku signals . So I decided to make a 3 lnb changer , C-Lin - C-Circ and Ku . For C-Circ the "bottle" depolariser with stubs was the most effective to my set-up . However its performance change by the frequency , some signals improved by pulling the "bottle" a little bit out of the wavepipe . Since the only at my location receiveble (120 cm dish) C-Lin signals dissapeared ( 10º E) there was no need for that lnb anymore . A Ka lnb could fill that place . But to keep the possabillity receiving C-Lin in the future I (hopefully) develloped a way to receive both , C-cic and C-lin in one lnb by rotating the "bottle" in such position it dont interfear the Hor en Vert lin signals . Also improvement of the Circ signals at different frequencys by turning it a little bit instead of pulling it out . So I made a prototype but to test it I have put a set-up at a other location since more east as 46º I cannot receive by trees . For the moment I use a small E-motor to a even small gear box , no feedback or end switches . Finaly I intend to use a servomotor as used by RC cars and boats . The gear ring around the wave pipe is made of a 63 mm PVC pipe adapter . It was a hell of a job to make those 39 teeth to it . [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Depolariser
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