The Art of Mastering
Jul 13, 2023 // By:aebi // No Comment
Intermodulation Calculator: What You Need To Now Today
When it comes to calculating intermodulation products from multiple frequencies, it is a harder job doing it physically. However, there is hope. An intermodulation calculator comes in handy when you start planning to do the calculations. Today, intermodulation calculators are used to predict those possible occurrences for intermodulation products that can cause interference on receivers at the radio repeater sites. The calculator achieves this by doing some tests for the odds and order products which come because there is a mix of various transmitters at a chosen site.
You might be having some power amplifiers that will not be giving an absolute linear performance. With this, the intermodulation product will get generated because there is a nonlinear characteristic. Now, the spurious signals end up disturbing the performance operations of these systems as the amplifier is sued. There is a limit that will be invertible always as there is an internal power supply voltage. The current supply also is affected.
For the calculator to give the results as transmitted, it comes with several features. For example, there is the support of frequencies that start from 1MHZ to 999GHz. The thread also starts from 2nd to 33rd with various wide ranges of spacing channels. This may include 6.25 KHz which will generate CSV reports. The good news is that these CSV reports can be imported to be used in Microsoft Excel sheets.
For some other installed software in the calculator, the longitude and latitude coordinates for the site locations will also be useful.
Here are some common specks that make it easy to give the correct report on frequencies.
There is color-coded, concise, and clear reporting from this calculator.
Also, there are receiver and transmitter frequencies.
The in-band or out-band calculators are supported by specs.
You can also make use of the odd or only and even help with one-order calculation support.
Additionally, another vital spec for these intermodulation calculators is the ability to choose report generation and highlighting using colors.
Also, there is that receiver image frequency support.
A programmable transmit deviating window is also a vital spec for this calculator.
With the advancement in technology, this calculator is now easily used with PC notebooks and is mainly applied in solving inter-modulation interference issues at repeater sites, military sites, airport towers, and cellular sites.
But how are these calculators used?
First, the intermodulation calculator has been among the easy to use on those sites. First, you need to log in and enter 2 transmit frequencies. These frequencies on the PIM product can now be calculated and then displayed. There are two minimum inputs to be used in this. However, there is much more here. Users can check for the triple-beat PIMs entered as 3rd frequencies. To check PIM products in uplinks, you need to input these received bands’ frequency and their bandwidth.
We know that the intermodulation calculator helps in calculating the IMD products, and is based on 2 frequencies. The IMD products are found in more than 2 frequency inputs. The calculator helps to find 2nd and 3rd-order IMD products because these are the ones found near inputs frequencies. Also, these have more powers.