Re: RF power chain mods and improvements..

Nick VK4PP
 

Hi Allison.

Would you say the 2n2222A were better candidates than 2n5109? that is in regards to flatness of output across the bands?

A technical Question/ Learning session if you wouldnt mind Allison/ Others:

So to set the bias of these BJT we are changing a resistor to get a certain amperage.
Lets take the pre-driver #1, Q90, for instance: is the bias set by R81 and R82(voltage divider)? and if so, according to your earlier post we measure the voltage drop across the emitter resistor, and then calculate the mA. Now you state 20-30ma? where does that figure come from? is it different for each BJT we try?

Thank you for taking the time to edumacate us.
73 Nick VK4PLN

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