Many years of development by two hands-on engineers who appreciate the practical side of filter development, not just the engineering side, combined with a 6 month "Beta-test" involving 10 copies of the package in the harsh environment of a major filter company attest to fact that PCFILT is accurate and bug-free. You won't find a need for a Masters degree in network synthesis to design filters with PCFILT, just enough experience to know what kind of filter you want. You won't find a lot of glitter and "eye-wash" either. What you will find is the fastest and most convenient integrated design and evaluation environment for filters available at any price. There is nothing else to buy, even the network analysis and optimization programs are internal and always available. The user interface has been developed to provide the designer with an operating scheme that represents a new standard in flexibility, speed and power.

The beginning user will find a menu-driven scheme for the design of all of the most common filter types with help screens on each menu to lead the way. In a short time, the power and internal sophistication of the program will become obvious allowing the design of extremely sophisticated networks with an order of ease and flexibility that will amaze you. You will find no other program available that can compare!

Examine the sample screens or Jump right to the official specs and capabilities

PCFILT has a built in network analysis module with a graphics plot featuring fully automatic scale factors in a 1-2-5 sequence just like a network analyzer. No mental arithmetic is needed to read the frequency scale! The plot can display attenuation, group delay, phase linearity, a Smith chart and one extra plot which can be voltage, current, loss or simple impedance. These can be displayed individually or all at once.

9 definable fixed frequency markers (F1, F2 ...) let you quickly move the marker to a specific point to check critical specifications.

Filters can be designed separately and joined together in series with one another or with one end of each all in common to form a multiplexer. You can quickly select which channel to "look through" with analysis by selecting the channel with the circuit editor just as you would switch the cables between the channels on a real network analyzer.

Of course, PCFILT designs a staggering variety of filters quickly by simply scaling them from the large variety of normalized reference lowpass filters provided. You could use Chebyshev or Gaussian to 6 dB or a lot of others, but then, most of the other programs available do that. PCFILT is different because it will scale ANY filter from ANY type of lowpass reference including those from its own internal reference pole placer. Just think, a capacitively coupled resonator filter with stopband notches added anywhere you want them. You won't have to optimize it either! PCFILT even goes one step further. It can actually synthesize bandpass filters directly to your specifications WITHOUT scaling them from a lowpass filter. This means a perfectly equal ripple passband with any number of stopband notches anywhere you want them. The plot above even shows the specification mask that was used with this example.

Another nice utility you might need is Fourier analysis in the time domain. PCFILT let you see the output of any filter when its input is hit with a spike, a square pulse with any duty cycle up to 99% or a gated RF carrier. The response of a typical Chebyshev lowpass filter with a square input pulse is displayed.

A common type of filter that can be quite difficult to design is the coaxial "tubular". Getting the right coupling thickness and wire lengths can be quite difficult. This is an easy job for PCFILT. It even makes all the slugs equal to whatever size you specify and shows you the assembled filter to exact scale.

Have you ever wanted to know where the worst case voltage or currents will develop in a filter when it has to handle a high power level? PCFILT will show you the voltage and current levels at any place in any filter with any termination VSWR and over any frequency range. You can even plot the voltage, current or losses at any point in the filter across any frequency range! A plot of the voltage at the top of a resonator in a typical combline filter is displayed here.

Sometimes you will need to touch up a design. PCFILT offers an internal optimization modules that will optimize on the part or parts of your choice to improve return loss or flatten group delay or amplitude. A "tune" mode let you try values you like at any branch or step the value up or down using the keyboard. Above, a 10% bandwidth linear phase filter is being optimized for flattest group delay.



The program consists of many object modules written in "C", compiled and linked together creating a single executable program.