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Tech Head - The Technology Section
The Work Bench and Soldering Station
Schematic for Echostar AD3000ip LNB switching circuit
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<blockquote data-quote="Llew" data-source="post: 462366" data-attributes="member: 175007"><p>I've been poking around in the AD3000ip to check out the layout of the LNB switching supply, as I have in the past had failures of a couple transistors due to silly shorts brought on by failure to make sure the cabling from LNB to f- plug is sound (I'm always swopping and re-terminating connections).</p><p></p><p>Q904 and Q909 are in my opinion the most likely suspects to be damaged if a short in the cable occurs for any length of time.</p><p></p><p>Here's my effort at drawing the schematic. I haven't provided values for the semis, just swop like for like or use any medium power rated transistors.</p><p></p><p>Llew</p></blockquote><p></p>
[QUOTE="Llew, post: 462366, member: 175007"] I've been poking around in the AD3000ip to check out the layout of the LNB switching supply, as I have in the past had failures of a couple transistors due to silly shorts brought on by failure to make sure the cabling from LNB to f- plug is sound (I'm always swopping and re-terminating connections). Q904 and Q909 are in my opinion the most likely suspects to be damaged if a short in the cable occurs for any length of time. Here's my effort at drawing the schematic. I haven't provided values for the semis, just swop like for like or use any medium power rated transistors. Llew [/QUOTE]
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Miscellaneous Sections
Tech Head - The Technology Section
The Work Bench and Soldering Station
Schematic for Echostar AD3000ip LNB switching circuit
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