Author Topic: CPI CMA382400AUP up-converter hook up question  (Read 140 times)

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Offline mr edTopic starter

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CPI CMA382400AUP up-converter hook up question
« on: August 22, 2024, 03:32:15 pm »
I have a CMA382400AUP which is a 13GHz to 40GHz tripler and I see conflicting power supply voltages for it.
The seller indicates 5, 8, -5 volts but other paperwork says 12volts which I guess is for 8v line. Maybe.
The power out is low at 8v and varies when the 8 volt line is dropped. It looks like the 8v line is meant to be good to 12v which might give the 20dBm I expect.  Obviously, I don't want to apply 12v and destroy it. Searches have failed me.

 Does anybody know for sure what the voltages should be?   
 

Offline mr edTopic starter

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Re: CPI CMA382400AUP up-converter hook up question SOLVED
« Reply #1 on: August 23, 2024, 02:06:40 am »
The -5V line is a bias of some sort, you need to tune the output RF gain by reducing this voltage down from -5v as it's not fixed at -5V as shown in the spec sheet. It needs to be variable.

Dropping from -5v to -3v adds more than 20dB of output power at 38GHz.

The +8 volt line also varies power out but it's less sensitive. Leave at +8 for normal ops.

So,  pinouts follow and are from the WR28 port going up on the body ...

Common                            black
+5  400mA  main power  grey
0 to +8v   V control            red        (adj for power desired)
-2v to -5v   bias                   green   (adj to peak RF for each unit)

(Follow the colors to get the connectors pinout).





 


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