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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Ka B/C overlap (Hughes) Thread
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<blockquote data-quote="John" data-source="post: 977615" data-attributes="member: 175005"><p>....Patience is a virtue they say</p><p>Mine and Chris's are a different pcb layout as can be seen in the comparison pic between Llews & mine.</p><p>After quite a bit of fine tuning of divider resistor choices i can now make it switch ports with different lnb supply voltages.</p><p>A 2.7k was used instead of the 1.2k as shown on Llews drawing, the 22k one remained.</p><p>A lnb supply volts of 12v gave .691v onto pin 3 at 143mA current draw and gave RHC/V port. Analyser shows fairly flat gain across the band @ 56.7dBuV.</p><p>A lnb supply volts of 17v gave 1.04v onto pin 3 at 147mA current draw and gave LHC/H port. Analyser shows fairly flat gain across the band but with better gain @ 60.3dBuV.</p><p></p><p>All above findings were using a short 2mtr length of coax from the analysers voltage settings ...... i need to put on a length of test coax of about 18mtrs to simulate the actual installed length of coax to see if the slight voltage drop incurred effects the lnb polarity switching .</p><p>----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------</p><p>[ATTACH=full]95025[/ATTACH] [ATTACH=full]95026[/ATTACH] [ATTACH=full]95027[/ATTACH]</p></blockquote><p></p>
[QUOTE="John, post: 977615, member: 175005"] ....Patience is a virtue they say Mine and Chris's are a different pcb layout as can be seen in the comparison pic between Llews & mine. After quite a bit of fine tuning of divider resistor choices i can now make it switch ports with different lnb supply voltages. A 2.7k was used instead of the 1.2k as shown on Llews drawing, the 22k one remained. A lnb supply volts of 12v gave .691v onto pin 3 at 143mA current draw and gave RHC/V port. Analyser shows fairly flat gain across the band @ 56.7dBuV. A lnb supply volts of 17v gave 1.04v onto pin 3 at 147mA current draw and gave LHC/H port. Analyser shows fairly flat gain across the band but with better gain @ 60.3dBuV. All above findings were using a short 2mtr length of coax from the analysers voltage settings ...... i need to put on a length of test coax of about 18mtrs to simulate the actual installed length of coax to see if the slight voltage drop incurred effects the lnb polarity switching . ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- [ATTACH=full]95025[/ATTACH] [ATTACH=full]95026[/ATTACH] [ATTACH=full]95027[/ATTACH] [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Ka B/C overlap (Hughes) Thread
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