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Testing an LNB
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<blockquote data-quote="ralphmagno" data-source="post: 766758" data-attributes="member: 189146"><p>thello to all,</p><p>an lnb can only be checked for shorts with a multimeter.</p><p>there are some problems that i have seen.</p><p>cold solder joint on the mother board where the cable is connected.soldered the joint and it was fixed.</p><p>lo 2 broke lo 1 was fine. then the 22 khz was on the signal went dead.</p><p>first if amp transistor was shorted causing the level was low.</p><p>it still worked but signal and quality was bad.on an AFN decoder the strenth was 45 quality was 0 it was braking up.</p><p>changed to a new lnb quality was 8 strenth 65.</p><p>plastic lense is open and bugs built nest inside or lense was cracked and was green inside.</p><p>for the price of the lnb 5 euro swap it out.</p><p>after that line old or receiver has a problem.</p><p>if the receiver does not generate the 22 khz it will stay in upper band or if the 22 khz does not deactivate it will stay in upper.</p><p>being that bbc 1 and bbc 2 itv free view are on lower band this could be a problem as well.</p><p>lnb's do not have cristals at all.they use the ceramic diletrec chip with a microwave transistor that is the osclator tank.</p><p>ghost capacitor of the chip forms the L/C tank for the osclator to run.</p><p>just some information</p><p>ralph</p></blockquote><p></p>
[QUOTE="ralphmagno, post: 766758, member: 189146"] thello to all, an lnb can only be checked for shorts with a multimeter. there are some problems that i have seen. cold solder joint on the mother board where the cable is connected.soldered the joint and it was fixed. lo 2 broke lo 1 was fine. then the 22 khz was on the signal went dead. first if amp transistor was shorted causing the level was low. it still worked but signal and quality was bad.on an AFN decoder the strenth was 45 quality was 0 it was braking up. changed to a new lnb quality was 8 strenth 65. plastic lense is open and bugs built nest inside or lense was cracked and was green inside. for the price of the lnb 5 euro swap it out. after that line old or receiver has a problem. if the receiver does not generate the 22 khz it will stay in upper band or if the 22 khz does not deactivate it will stay in upper. being that bbc 1 and bbc 2 itv free view are on lower band this could be a problem as well. lnb's do not have cristals at all.they use the ceramic diletrec chip with a microwave transistor that is the osclator tank. ghost capacitor of the chip forms the L/C tank for the osclator to run. just some information ralph [/QUOTE]
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