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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
The DirecTV SL3K4NR1-03
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<blockquote data-quote="Vipersan" data-source="post: 897386" data-attributes="member: 325666"><p>Ok ...As my dish is currently out of commission ..I decided to do some more poking around in this new SL3 ..</p><p>I suspect the older version works the same way ..but for now I cannot confirm this.</p><p>It would appear that ALL port inputs for signal are active All of the time ..that is to say NOT switched</p><p>I guess there was no need since there cannot be crosstalk between polarities when using Circular ..</p><p>H/V (Linear) would need a degree of isolation ..</p><p>So dealing with only one Ka input port (lnb)</p><p>The degree of isolation to be had by using a septum to seperate RHCP and LHCP means the 2 polarised signal drop either side of the septum ..thus one probe collects R the other L ...and therefore no need to turn the mixers or front ends on or off ...</p><p>the outputs of these 2 sets of polarised signals make their way to one of the 2 channels of the Zetex 2012 multiplexer chip..</p><p>The chip having 2 channels which can be selected either/or internally using the 22khz signal.</p><p>So both Left Ka input and Right Ka input lnbs are ON all the time and both receiving BOTH polarities ..</p><p>Selection of the wanted LNB is done by internal selection in the multiplexer chip thus ignoring the unwanted signals which also arrive regardless.</p><p></p><p>Which brings me to the conclusion that although we can use this lnb to receive Linear signals ..it can only work IF there aren't two broadcasts on the same frequency but in directly opposing polarities ...</p><p>Providing there is a degree of seperation frequency wise both Left and Right signals could theoretically be collected but since we cannot turn off the unwanted polarity it would be very difficult to decide what polarity the signal ACTUALLY was ..</p><p>And since the 2 front end probes cannot be independantly controlled there may be little advantage to opening the whole waveguide up to both probes ..</p><p>It might be an advantage to keep them seperate ..but I'm still considering rotating one of them through 90 degrees..</p><p>The fact that ALL 3 lnbs and ALL polarities are active ALL the time makes this a very power hungry beast..</p><p>I can see why they built it this way ..but certainly not very efficient power wise.</p><p></p><p>After all this is a multiroom device and having ALL lnbs and probes active all the time means any receiver in any room can access any satellite in the cluster and any polarity on that satellite..without any one receiver having ultimate control..</p><p></p><p>rgds</p><p>VS</p></blockquote><p></p>
[QUOTE="Vipersan, post: 897386, member: 325666"] Ok ...As my dish is currently out of commission ..I decided to do some more poking around in this new SL3 .. I suspect the older version works the same way ..but for now I cannot confirm this. It would appear that ALL port inputs for signal are active All of the time ..that is to say NOT switched I guess there was no need since there cannot be crosstalk between polarities when using Circular .. H/V (Linear) would need a degree of isolation .. So dealing with only one Ka input port (lnb) The degree of isolation to be had by using a septum to seperate RHCP and LHCP means the 2 polarised signal drop either side of the septum ..thus one probe collects R the other L ...and therefore no need to turn the mixers or front ends on or off ... the outputs of these 2 sets of polarised signals make their way to one of the 2 channels of the Zetex 2012 multiplexer chip.. The chip having 2 channels which can be selected either/or internally using the 22khz signal. So both Left Ka input and Right Ka input lnbs are ON all the time and both receiving BOTH polarities .. Selection of the wanted LNB is done by internal selection in the multiplexer chip thus ignoring the unwanted signals which also arrive regardless. Which brings me to the conclusion that although we can use this lnb to receive Linear signals ..it can only work IF there aren't two broadcasts on the same frequency but in directly opposing polarities ... Providing there is a degree of seperation frequency wise both Left and Right signals could theoretically be collected but since we cannot turn off the unwanted polarity it would be very difficult to decide what polarity the signal ACTUALLY was .. And since the 2 front end probes cannot be independantly controlled there may be little advantage to opening the whole waveguide up to both probes .. It might be an advantage to keep them seperate ..but I'm still considering rotating one of them through 90 degrees.. The fact that ALL 3 lnbs and ALL polarities are active ALL the time makes this a very power hungry beast.. I can see why they built it this way ..but certainly not very efficient power wise. After all this is a multiroom device and having ALL lnbs and probes active all the time means any receiver in any room can access any satellite in the cluster and any polarity on that satellite..without any one receiver having ultimate control.. rgds VS [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
The DirecTV SL3K4NR1-03
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