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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Gilat AN8004 mod.
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<blockquote data-quote="s-band" data-source="post: 1151115" data-attributes="member: 407744"><p>I wouldn't worry about the corrosion on the large areas of plane on the underside. </p><p></p><p>I should have said that the current of around 120mA is with a 12V supply (it gets higher at lower voltage). Attached are my notes from a while ago showing voltages across the board. I'm surprised that that input track eroded enough to break the connection but re-making it with a bit of copper tape will be OK. </p><p></p><p>If the electrolytic action caused dendrites to form between the coupling elements in the LNA, it's possible that the FETs could be damaged. In that case, you'd see reduced output noise. Compare the voltages to mine. There will be small variations between FETs and be aware that the LNA may go unstable with the cover removed. This will affect the voltages a bit. However, the gates should all be slightly negative and the drains around 2V positive. Check that the synth is locked by looking at the voltage on the pin next to the IF out. It should be around 2.5V locked and will be zero when unlocked.</p></blockquote><p></p>
[QUOTE="s-band, post: 1151115, member: 407744"] I wouldn't worry about the corrosion on the large areas of plane on the underside. I should have said that the current of around 120mA is with a 12V supply (it gets higher at lower voltage). Attached are my notes from a while ago showing voltages across the board. I'm surprised that that input track eroded enough to break the connection but re-making it with a bit of copper tape will be OK. If the electrolytic action caused dendrites to form between the coupling elements in the LNA, it's possible that the FETs could be damaged. In that case, you'd see reduced output noise. Compare the voltages to mine. There will be small variations between FETs and be aware that the LNA may go unstable with the cover removed. This will affect the voltages a bit. However, the gates should all be slightly negative and the drains around 2V positive. Check that the synth is locked by looking at the voltage on the pin next to the IF out. It should be around 2.5V locked and will be zero when unlocked. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Gilat AN8004 mod.
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