QuadNet is one of the
programs included on the Bonus CD accompanying the ARRL
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
- 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
- Handles orders 2 through 12,
odd and even.
- Outputs to the printer are not
just screen dumps but are separate high-resolution
- 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).