Current revision is 2.17; revision history is at
the bottom of this page
This program is designed to facilitate the design and also
analysis of PI and PI-L networks as used in transmitter
- The design screen accepts inputs for the operating
frequency, the load as seen by the final amplifier
tube, the intermediate impedance (if the L-network is
to be used), the output load value and the Q value for
- The above values have defaults for program startup.
After using the program, your current values are saved
for easy program restart.
- In addition to simply entering values into the text
boxes, "tuning" buttons allow tuning the intermediate
impedance up or down in 1% steps and immediately seeing
the new component values on the schematic.
- The Q value for the PI network is entered and tuned
in that same manner.
- Regardless of whether an "out of bounds" value is
entered via a textbox or by tuning, the program
examines the values and limits them to values which are
- Click on the Plot button and see
transmission and return plotted. On the plot are
indicated the responses for the fundamental, the second
and third harmonics. Those items are also shown in
tabular form at the bottom of the screen.
- After the design has progressed to a particular
point you may click on Save to save the plot.
Later you may recall that plot by clicking on the
- Design methods using tables are now history.
|Here are screen dumps from the program. Click on these
images to see the larger versions; use your brower's BACK
button to return.
Load Help screen:
Inductor Design screen:
Updated to 2.17 - Interface and cosmetic upgrades;
allow entry of value of generator output impedance (seen
looking back into generator) for analysis
Updated to 2.16 - Conditional plotting error
(Rmid=Rload) found and fixed; minor interface upgrades
Updated to 2.15 - Graphics revised
Updated to 2.14 - Near-total rewrite of Design
screen to include a reduced-size plot on that same
Updated to 2.13 - Significant upgrade to Design and
Updated to 2.12 - Minor changes to a page label and
the last-session file
Updated to 2.11 - Improved minimum-Q error
Updated to 2.10 - Added piracy notice to program
Updated to 2.09 - Deleted generic Spice netlist
writer, added LTspice schematic writer
Note: Tonne Software has no connection with Linear
Updated to 2.08 - Corrected total-network phase
error, minor interface and printed-output improvements
Updated to 2.07 - Simplified input-termination
entry now based only on power and peak plate swing
Updated to 2.06 - Correct item-placement errors on
high-resolution monitor screens
Updated to 2.05 - Add inductor-winding routine,
clarify volt and amp stress numbers.
Updated to 2.04 - Add peak voltage across each
capacitor and RMS current through every part, based on the
Updated to 2.03 - Add significant help screen for
input termination (plate load) entry; you may
specify voltage and power (or voltage and current) and
have the progran calculate the input termination.
Updated to 2.02 Show phase angles during tuning,
allow save/get data plot for comparison
Released as 2.01 - 1 February 2006