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help on RF feeding on RF amplifier!

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Willen

Well-Known Member
There are two RF amp
A. Drive RF 1 watt, output 4/5 watt
B. Drive RF 2.5 watt, output 25 watt
Here, both amp has pair of trimmers on their input and output to match input/output.
In this situation can we feed amp 'A' to amp 'B'? Can these trimmers match the best rf level between two amp?
Don't be afraid, I am not going to make; just asking to know result.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
The trimmers are to match the impedances, they don't specifically alter the power.

You could certainly feed one from the other (it's what higher power transmitters contain inside), but you would want to lower the feed to prevent too much input power to the final stage (an attenuator before or after the first amp would do the job - preferably before it).
 

Willen

Well-Known Member
You could certainly feed one from the other (it's what higher power transmitters contain inside), but you would want to lower the feed to prevent too much input power to the final stage (an attenuator before or after the first amp would do the job - preferably before it).
Cannot understand more, Um....attenuator....... Can't we make attenuator ourself? Do you have any link or schematics of attenuator which is suitable for this problem? sorry :(
 
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davenn

Active Member
Cannot understand more, Um....attenuator....... Can't we make attenuator ourself? Do you have any link or schematics of attenuator which is suitable for this problem? sorry :(
yes you can easily make your own attenuator, there are 2 common styles "pii" and "t" and plent of online calculators for working out the resistor values
google pii attenuator,
goodle pii atennuator calculator

Dave
 
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