help me please with theses

[radium98]

hey to all i have 1 question and i post here IMAGE

i would like to know in this rf amplifier at the output stage on the power transformer there is a brown coaxial does anyone know the impedance of it and if there a way to mesure it too

thanks for all replies and helps .

https://obrazki.elektroda.pl/57_1276892070.jpg

 

[radium98]

:?: where are u no one is here and need realy help
edaboard members

 

[georgz]

About the 2nd question check the following links,
**broken link removed**
https://www.prc68.com/I/Z.shtml

 

[radium98]

About the 2nd question check the following links,
**broken link removed**
https://www.prc68.com/I/Z.shtml

thanks for u georgz
more help please


50 ohms or 25 ohms

 

[karesz]

Hi,
Me seems to be RG174/U, & if; than Z= 50+/-2 Ohm:
**broken link removed**
K.

 

[radium98]

Hi,
Me seems to be RG174/U, & if; than Z= 50+/-2 Ohm:
**broken link removed**
K.

thanks

 

[big porkus]

Hi radium98,

I agree with karesz regarding the cable impedance.

I suggest you to check if the final output impedance is 50 Ohm as expected measuring the output voltage.

Build a non inductive load usable at the operative frequencies of your circuit.
If possible set the output to a safe level i.e. 1Vpp leave the output without load, then connect the load, repeat the measure, if the impedance is matched you will see half voltage i.e. 0.5Vpp.
Don't do it driving circuit to full power, you may turn it to a popcorn basket... ;-)

Good luck
Bye

 

[radium98]

big porkus

thanks for u ,its a 50 ohm coaxial cable someone tell me its an old cte fm 300w amplifier used in FM commercial band radio station

 

[sandracg03]

Do you want it really?
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[Amithsleek]

Yes You can check the impedance and the inpedance is 50-75ohms.

 

[silentlion]

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Added after 2 minutes:

How can i connection between S7-200 siemens with software labview monitoring through port RS232?