Author Topic: CMU200  (Read 284 times)

0 Members and 1 Guest are viewing this topic.

Offline elettronica52

  • Contributor
  • Posts: 6
  • Country: it
CMU200
« on: November 07, 2019, 11:34:08 am »
I have the rxtx module with the tx section broken. a very low signal comes out. does anyone know these components on the tx output?
BW5Z and the small one is G4C.
« Last Edit: November 07, 2019, 08:08:16 pm by elettronica52 »
 

Offline markus_jlrb

  • Regular Contributor
  • *
  • Posts: 87
  • Country: de
Re: CMU200
« Reply #1 on: November 07, 2019, 12:10:37 pm »
In order to check the propper functionality of the BW5Z (gain) block,
I would separate the gain block and powered it externally and inject
an external signal at the input.

See my attached image.

Using an external lab power supply you could limit the current to 50mA
and Voltage to 5V at starting point and observ the test signal at output.

If the gain block is working propperly you will get a corresponding output
signal.

Good Luck
Markus
« Last Edit: November 07, 2019, 12:12:20 pm by markus_jlrb »
 
The following users thanked this post: elettronica52

Online YU7C

  • Regular Contributor
  • *
  • Posts: 51
  • Country: cs
Re: CMU200
« Reply #2 on: November 07, 2019, 12:14:48 pm »
UPG2179TB (G4C) is SPDT RF Switch,
SBW-5089Z (BW5Z) is Qorvo MMIC Amplifier.

SBW-5089Z is limited to 6V and 130mA.

Voja
« Last Edit: November 07, 2019, 12:19:02 pm by YU7C »
 
The following users thanked this post: elettronica52

Offline elettronica52

  • Contributor
  • Posts: 6
  • Country: it
Re: CMU200
« Reply #3 on: November 07, 2019, 09:15:30 pm »
and if I put 3 wires for the probes can I measure the in / out signal and if voltage is supplied with the board open? there are several transistors in series with the supply voltage and maybe someone doesn't let it pass. however it must be done for each amp starting from the output.
 

Online YU7C

  • Regular Contributor
  • *
  • Posts: 51
  • Country: cs
Re: CMU200
« Reply #4 on: November 08, 2019, 06:19:49 am »
You can use active rf probe and check levels on each stage w/o intervention on the board.
 I'm using Tek. P6202 connected to SA.
 
The following users thanked this post: elettronica52


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf