[Amps] Line Sections As Plate Lines

[craxd]

Jeff,
It can also be affected by the way the stripline is mounted, or how 
close it is to the surrounding structure. That's what I was thinking 
they were probably taking into consideration. Just like tweaking a tank 
coil, about the same difference. I never did get involved with any 2 
meter equipment or higher frequencies due to this. Seems like you can 
pass wind and something will change..LOL! This is discussed somewhat in 
the VHF/UHF Handbook. Also, most measurements in print are rounded off 
to the nearest whole number in many places, especially when describing a 
product without a lot of detail. About like saying a chassis is 17" wide 
when it's actually 17-3/32" overall.

Will Matney


The plate lines are not 1/4 or 1/2 wave long because the resonance and
matching has to include the effects of the tuning capacitor and output
coupling capacitor.  This effect shows up well on a smith chart.  The
end of the line has to look inductive to resonate with the output caps. 
The amount of inductance depends on both length and impedance of the line.

 I've been playing with software from Lance Lascari

     
(http://tools.rfdude.com/RFdude_Smith_Chart_Program/RFdude_smith_chart_program.html)


and building some matching network at 144 and 432 using the models and
get good results.  If you're interested, I can send you some examples.

I'm copying my self at work because that's where I run Lance's
software.  At home, I use a  similar program for  Linux.

jeff, wa1hco