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Now, as far as waveform, you may need to look for those Pin Diodes.

Do you have any history on the radio - was it working with a Linear / Amp and the Amp went bad?

Was it in a Mobile, and the vehicle was caught in a storm - was working - now it don't scenario.

Both usually arrive to the same conclusion - input signal path damage, but how bad?

This is why I'm having you look for signal - and by what I see - RF Gain or not, looks like the diodes are doing something - just not sure if a short or blown open - so you may need to look into removing pulling the diodes and observe the waveform. If you now get it as a pure signal like you'd see at TR18 - then suspect the PIN diodes got damaged and replace them both. This also raises the bar on what other parts in the section can be affected.- for there is now more evidence that power, more than it was designed for - was sent thru into the RF amp section.

<blockquote data-quote="Handy Andy" data-source="post: 662228" data-attributes="member: 52309">Now, as far as waveform, you may need to look for those Pin Diodes.Do you have any history on the radio - was it working with a Linear / Amp and the Amp went bad?Was it in a Mobile, and the vehicle was caught in a storm - was working&nbsp; - now it don&#039;t scenario.Both usually arrive to the same conclusion - input signal path damage, but how bad?This is why I&#039;m having you look for signal - and by what I see - RF Gain or not, looks like the diodes are doing something - just not sure if a short or blown open - so you may need to look into removing pulling the diodes and observe the waveform. If you now get it as a pure signal like you&#039;d see at TR18 - then suspect the PIN diodes got damaged and replace them both. This also raises the bar on what other parts in the section can be affected.- for there is now more evidence that power, more than it was designed for - was sent thru into the RF amp section.</blockquote>

[QUOTE="Handy Andy, post: 662228, member: 52309"] Now, as far as waveform, you may need to look for those Pin Diodes. Do you have any history on the radio - was it working with a Linear / Amp and the Amp went bad? Was it in a Mobile, and the vehicle was caught in a storm - was working - now it don't scenario. Both usually arrive to the same conclusion - input signal path damage, but how bad? This is why I'm having you look for signal - and by what I see - RF Gain or not, looks like the diodes are doing something - just not sure if a short or blown open - so you may need to look into removing pulling the diodes and observe the waveform. If you now get it as a pure signal like you'd see at TR18 - then suspect the PIN diodes got damaged and replace them both. This also raises the bar on what other parts in the section can be affected.- for there is now more evidence that power, more than it was designed for - was sent thru into the RF amp section. [/QUOTE]

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