What are intermodulation products?
Intermodulation products are new frequencies that can be created when two or more radio signals mix together. These newly created frequencies can interfere with existing radio frequencies.

Why do I need to calculate intermodulation products?
Intermodulation products should be calculated before installing two or more radio transmitters at a site in order to determine what new frequencies may be created by intermodulation. These new frequencies can cause serious interference with the site radio receivers and other nearby receivers. It is also a requirement by many frequency spectrum-regulating agencies to ensure interference is not created for other existing radio stations.

Will "F-Intermod" provide me with a list of these intermodulation frequencies?
Yes it will provide a list of possible intermod frequencies that may be created, for up to 1000 radio transceivers at a site.

Some output files are too large to open with Microsoft Excel or Word how can I access them?
It is common to have large output files that contain many intermod hits when large number of input frequencies are used.  We suggest using other applications to open these large files such as Textpad which can be found at www.textpad.com .

Can "F-Intermod" be used for audio applications?
Yes. F-Intermod is most commonly used for radio transmitter applications, however it can also be used for audio applications.

For example, F-Intermod can be used to calculate the RF intermods created from a system of wireless microphones.  Each channel represents one wireless microphone unit and has an equal transmit and receive frequency. The F-Intermod channel type must be set to Duplex. The Half Bandwidth is half of the passband of the receiver unit. If the passband of a 20 MHz receiver is 20 kHz, then 10 kHz is the half bandwidth.  Enter all wireless microphone channels in this manner and click Run to determine intermod.

Another audio example is to calculate the intermods for mixing different audio signals in an amplifier system. In this case, the F-Intermod Base Frequency Unit should be set to KHz, and each frequency should be entered as a Tx Freq with type set to Simplex half bandwidth set to 1 and List All Intermod selected (only available in r3.8 and higher) .  Then click Run to calculate all intermod products.