On Tue, Feb 18, 2025 at 10:31 PM, Reg Du Toit wrote:
Here are the results
?? The SA indicates a level of -75dBm at 30MHz
?? Switching on LNA the signal is gone completely
It does look as if the LNA is faulty but not to sure about the attenuator
I did a attenuator test and the green line was straight although also at a very low level
Maybe the input switch is also faulty
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? ?Assuming your unit was damaged while in the signal generator mode, the LNA was not in the signal path.? Either just the RF switch is faulty, as was the case for Bob, or also the attenuator.? I would purchase both and swap out the RF switch first.?
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I keep a spare set of these three components on hand to cover most repairs:
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- Input RF switch U22: XA17-G4K or AS179-92LF
- LNA U14: BGA2817
- Attenuator U38: PE4312C-Z
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Herb
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