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[Andrew Broughton]

1 P10T into PA821A

Good Combiner vs. Broken one...

[Scott Helmke]

Wow, haven't seen that one before.  When I've had a bad PA821A it'll be one or more ports just not getting a full signal through.

[Andrew Broughton]

I'm very curious what goes wrong inside them that can cause this kind of grief.

[Henry Cohen]

I'm very curious what goes wrong inside them that can cause this kind of grief.

Presuming this is only one input channel, its amplifier stage is bad. probably overloaded at some point.

[Andrew Broughton]

Makes sense. Yes it was just one input.
It was tough to diagnose without a scanner.

Thanks, Henry.


Sent from my iPhone using Tapatalk Pro

[David Pedd]

Presuming this is only one input channel, its amplifier stage is bad. probably overloaded at some point.

Went to a Shure seminar yesterday.  Great info.

The Shure man demonstrated how you overload the receiver front end by using the paddle antenna when you don't compensate for the db overload.

I'm guessing the same type of overload could fry the combiner.

[Lyle Williams]

An attenuator is one of the most useful RF debugging tools you can own.

[Andrew Broughton]

An attenuator is one of the most useful RF debugging tools you can own.

I'll bite... Could you elaborate?

[Henry Cohen]

I'll bite... Could you elaborate?

As a quick diagnostic tool to see if any part of your signal chain is being overloaded (with saturation of the subsequent gain stage) and causing problems which can appear as co-channel interference.

They are also indispensable when gain balancing a distributed antenna system.

[Lyle Williams]

If you add (say) 6dB of attenuation and your problems drop by more than 6dB, something is operating outside it's linear operating range.

[ProSoundWeb Community]