Search the Community
Showing results for tags 'Intermodulation'.
You guys seem to be my de facto sounding board... I am nearing completion of the first version of the FreqFinder app for iPhone and Android. It keeps track of all of your transmitter channels in use and then calculates the intermodulation products between them and tells you if any channels are being affected by intermodulation products. It is meant to be a replacement for the Lectrosonics intermod chart. It will also test all of a transmitter's options against the channels in use and provide a list of usable channels for when the need arrises to change frequencies. An add-on will provide a comparison against the fcc tv station database for users located in the US. First supported transmitters will be Lectrosonics and Comtek, but more will be added over time. The price will be $30 for the base app and $15 for the US TV add-on. Also, current front runner for the name is FreqFinder, but TXCentral is also an option.
FreqFinder version 1.8 for Android has been released and iOS version 2.3 is soon to follow. And what is new to both is worthy of a little bit of explanation. Settings which will affect the intermodulation calculation have been added. iPhone users had the 3x3 and 2x7 settings previously. The transmitter spacing and intermod spacing factors will be added soon. A summary of each of the settings: - Enable 7th Order Products This setting was enabled by default. Turning it off will provide you with more compatible channels at the cost of the quality of those channels. 7th Order Products tend to be much less severe and therefore users may wish to disable their calculation. - Enable 3 TX 3rd Order Products This setting was also enabled by default. Turning it off will provide you with more compatible channels at the cost of the quality of those channels. 3 TX 3rd Order products occur mainly when you have large groups of radios in tighter spaces. One might disable this if he were reasonably sure that the transmitters will be rather spread out. - Intermodulation Spacing Factor The default for this setting has always been at its least conservative. This is the padding between a transmitter and any intermodulation product. Increasing this value will result in fewer compatible channels. ***Note that the number itself is rather arbitrary. I do ask that you play with different settings and if you come to any interesting conclusions, I would very much like to hear them*** - Transmitter Spacing Factor This factor determines the minimum spacing between transmitters according to their bandwidth. The calculation averages two transmitters' bandwidths and then multiplies by this factor to determine the spacing. The default for this setting has always been at its least conservative, however a couple of transmitters have built in alternative minimum spacings (Lectrosonics has 300khz). This setting will override that minimum if it calculates a larger spacing. Even with maximum settings, a user will still get 10 channels out of a single Lectrosonics block. These controls are meant to provide extra protection and still allow a users with larger transmitter counts the ability to squeeze more channels in. I would recommend for most cart setups dialing the settings to maximum and keeping them there. I want to note that for these settings, you can not dial down the settings midway through adding transmitters and expect the first set of transmitters to stay protected at the higher settings. When you change the settings, all of the transmitters are protected at those settings. On that note, hopefully everyone has noticed the "Protection" switch on the transmitter details page. That is meant to add transmitters which would contribute to intermodulation but for which you do not care about the performance of the transmitters. In the future I'd like to have three protection options (NONE, DEFAULT, and EXTREME) that would allow for extra protection to selected transmitters. I hope everyone is finding FreqFinder suitable to their needs, and as always I love to hear from you guys. Best, James
Hi again. I am happy to announce that the TV Station Add-On for FreqFinder is very nearly ready for primetime! Features include: - Look up station data for your current location (determined by gps, cell, or wifi) or for any location in the US - Relate station data to any specific location for approximation of the interference caused by TV transmitters at that location - Relate station data to multiple locations simultaneously for a "worst case scenario" estimate - Station data for the selected areas stays on your device for offline use - Sort TV stations by name, channel, and estimated field strength - Filter TV stations by license status and by the channels affecting your current transmitter list (fully customizable filtering to be added in the future) - Station transmitter detail screen featuring a map view of the station's polar pattern - Estimated field strength calculation provided directly by the FCC - Location Profiles allow for multiple location configurations - Easy map search functionality allows fast finding of locations by address The add-on will be an in-app purchase costing $15. I am going to release it early (before it is available for purchase) and extend the preview time until the end of October to give everyone a chance to play. Soon after this update, the in-app purchase will be available, extending the functionality indefinitely. After October, the preview will expire and the add-on will have to be purchased in order to access any station data. I'm sorry to say that for the moment, the v2.0 will only be available for iPhone users. The Android preview will continue to be available until I make the complete add-on available to Android users. *Current FreqFinder users: the FCC has changed the format of their TV data. This update is required to properly receive FCC data. Currently, FCC data is only downloaded upon major location changes (>20 miles) and fresh installs. An update for Android is already on the app store. The iPhone update will be available as soon as Apple approves the update. Thank you for your patience.
Hello everyone, Many of us wanted use the large venue frequency coordination software, Intermodulation Analysis System, on our Macs (some of us resorting to VMWare to do so). And now we can! A recent update to the popular MacOS/Linux utilities, Wine and Wineskin, which are used to run windows programs, has enabled near full functionality of IAS on a Mac computer. I have posted a guide to install it at this link: http://newendian.com/index.php?title=IAS_for_Mac The only major thing that doesn't work (that I've found), is the intermod product graphs at the bottom of the screen. A proper license is of course required (some people may need to contact Professional Wireless about reactivating their license). The evaluation mode works fine for those who want to try IAS on Mac before buying it. Please try it and let everyone know if you have any interesting experiences. Cheers, James