rf amplifier
rf amplifier
hello there i have abit of a problem im still learning ..if anyone could help that would be great.. ive got 2 amplifiers what i put togeather the first one has a 10 dbm drive and it gives out 14.6 dbm its a 2 stage transistor the transistor is a bc54b...the next amplifier is also being driven with a 10 dbm drive and the outout is 20 dbm thease transistors are 2n3904 this has 2 stages..now what im trying to do is join one amplifier up to the next so we have 4 transistors but what happens is it cancels out each other i have dc blockers in the correct places im abit like i said im still learning..i can upload pics if needed thanks...
Re: rf amplifier
Hi dipole and welcome to the forum.
What sort of signal are you trying to amplify, e.g. TX RF or RX pre-amp?
If you can give us a better idea on what it is you're trying to achieve I am sure somebody can help
Cheers
Rob.
What sort of signal are you trying to amplify, e.g. TX RF or RX pre-amp?
If you can give us a better idea on what it is you're trying to achieve I am sure somebody can help
Cheers
Rob.
Re: rf amplifier
hello rob thanks for replying its a tx amplifier ive managed to build 2 what im trying to do is join them togeather but like i said in my first post it cancels out when i connect the 4 transistors togeather im useing a 1 nano fad capacitor for the dc blocker..it be great if i could go forward in this project if u could it be great it takes alot of my time at the moment but not enough time in the day.. the first amplifier is a 2 stage transistor its a 10 dbm input and its a 15 dbm output.. the second is a 10 dbm input n we get a 20 dbm output when i join them togeather they cancel out on the multimetre when i check the biasing on the second stage of the amplifier we get a negative sign on the metre if u have any advice it would be great thanks..
Re: rf amplifier
Welcome Dipole.
Some pics and the schematics would be a great help so we can see what you are trying to accomplish.
Also what do you mean by "it cancels out" when you join them together?
Some pics and the schematics would be a great help so we can see what you are trying to accomplish.
Also what do you mean by "it cancels out" when you join them together?
Terry VK5TM
https://www.vk5tm.com/
https://www.vk5tm.com/