# Proper method for calculating the resonant load resistor

Discussion in 'Amateur Radio Amplifiers' started by KB1SEL, May 15, 2011.

Not open for further replies.
1. ### KB1SELHam MemberQRZ Page

Hello all, Is it true in order to figure out the rl resistor value that you must take 1.8 and multiply it by the max plate current and then divide that awnser into the dc plate voltage rating. And that will give you the value of the non inductive resistor to be used.

So basicly 1.8 x 1 amp = 1.8 4000 vdc / 1.8 = 2222.22
So the rl resistor would be 2222.22 or the closest avaliable value non inductive resistor.

Or does the other method work better plate voltage divided by max plate current to get the rl resistor value

Does this sound right. Thanks

2. ### K9FVHam MemberQRZ Page

A good discussion of that very question took place here: http://forums.qrz.com/showthread.php?296719-PI-Net-question

read thru the total thread, and Tom (W8JI) sums it up nicely in the last couple of posts on last page - I think that thread will clear up some of your questions..... and raise more

73 de Ken H>

3. ### KB1SELHam MemberQRZ Page

Thanks. I think im all set though

73

4. ### KB1SELHam MemberQRZ Page

Tank coil installed and is set to perfect resonance. Thank you