A nifty disk came with the 1996 ARRL Handbook.
Among the programs is "pinet."
I find this useful in starting out with a new design.
You are asked to input R2, which is Rout, C(min),
Q, and steps for calculating R1.
I will let Tom et al decide if this is in the "ball park."
I ran an R2 of 50 ohms, C(min) of 15 pf, and Q of 5.
For 160 meters, I got :
C1=4194 pf L=2.9 uh and C2=4194 pf.
For a Q of 2, the above change to:
C1=1678 pf L=4.2 uh and C2=1678 pf.
"Free" software is sometimes worth what it costs, but
it has worked for starters for me.
(((73)))
Phil, K5PC
> > Is there a formula for calculating tuned input circuit Q. I see a
> > chart in Bill Orr,s Handbook for various input impedances with Q,s of
> > 2-3. Im probably missing something here. How would you calculate for a
> > tuned input Q of 5. Im trying to learn so if its a dumb question I
> > apologize for my lack of experience. Is it roughly Rin/xc1? Im curious
> > as how to arrive at the values for a tuned input pi net for a given Q.
> > 73,s Jeff
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|