Quad - from Tonne Software

A program to design and analyze active quadrature networks

This program is copyrighted and is not to be placed on another website
nor is it to be placed on any medium for distribution excepting the
CD accompanying the ARRL Handbook.
If you have obtained it from another site, they are posting it illegally.
Such copies may contain spyware or other malware and are typically obsolete.

Included on the CD accompanying the ARRL Handbook

QuadNet is one of the programs included on the Bonus CD accompanying the ARRL Handbook

This graphics-intensive program designs and analyzes active quadrature ("90-degree") networks for use in SSB transmitters and receivers.

Here are the highlights of this program:

QuadNet is a 32-bit Windows® program to design and analyze active quadrature networks.
Enter the lower and upper audio frequencies of interest, along with the network complexity (order) and see the resulting sideband attenuation. Change any of these items to interactively refine your design.
Plug in the values for a published design to see how it works.
Fine graphics outputs include sideband suppression, the angles for each of the two chains, and the deviation from target.
Change or tune the stage time-constants and you can generate a network with sideband suppression which is not uniform across the audio band.
Save as an overlay the current-schematic sideband suppression plot, make changes and then recall that stored response for comparison with new data by overlaying the old plotted data on top of the current plot.
Use the nearest-value routine to substitute the nearest 1% or 5% values for the program-computed values and see the result.
Use the Monte Carlo mode to see what happens when real-world parts are used with user-specified value tolerances.
Schematic is shown in graphics form. This is in addition to a conventional "parts list."
Handles orders two through ten, odd and even.
Outputs to the printer are not just screen dumps but are separate high-resolution routines.
Writes a nice ready-to-run LTspice file for math confirmation and/or to see the effects of a real-world op-amp (Tonne Software has no connection with Linear Technology).

Here are screen dumps from the program illustrating some of the outputs to the screen. Click on them to see larger versions; use your brower's BACK button to return. Users with 800x600 monitors may have to re-enlarge the full-size image to get an accurate rendition.

Schematic:	Sideband suppression:	Angles:
Phase error:	Parts list:	Tabulated output:
Design entry:	Analysis range entry:	Monte Carlo entry: