Electronics > RF, Microwave, Ham Radio

CMU200 50Watt with B95 Option?

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chick0n:
Hi

I own a cmu200 with option B95 (2nd generator). So I can only use the cmu with 2Watt input.
Option B95 is Sandwiched to the RF-Frontend Board. I opened the Frontend, and there is a 50Watt 17dB attenuator placed. Also there is place for another one.

Maybe it is possible to use the cmu with more than 2W input, when option B95 is disconnected/removed?

Maybe someone with a 50Watt unit could make pictures of his frontend. To compare and see if a 2nd attenuator is placed?

xmo:
I think port RF1 has that attenuator so it can accept 50 watts whereas RF2 has no attenuator and can only handle 2 watts.

Option CMU-U99/B99 deletes the attenuator and makes the range of RF1 and RF2 be the same.

chick0n:

--- Quote from: xmo on July 24, 2021, 04:28:07 am ---I think port RF1 has that attenuator so it can accept 50 watts whereas RF2 has no attenuator and can only handle 2 watts.

Option CMU-U99/B99 deletes the attenuator and makes the range of RF1 and RF2 be the same.

--- End quote ---

But every CMU200 with B95/96 has a Warning Sticker on Port RF1 and RF2 "Only 2 Watts". Mine too. Why?

Maybe its just the cooling... The 50Watt frontend has a fat heatsink installed, and B95 Option has none.

xmo:
You are probably right about the heatsink.

I looked in the datasheet again and found that it does say you get reduced power with B95 so that accounts for the sticker.

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