Saturday, July 16, 2011

146.730 Repeater

Tim, WB4GBI, announces that the 146.730 repeater should be rocking and rolling again after eliminating a tricky problem.
"The offending signal is actually produced when two UHF transmitters (there is another one involved) and the 146.73 transmitter are all “up” at the same time. How did I determine this? There several software programs out there in shareware and software land that will help you calculate all of the possibilities. I tabulated the frequency of EVERY transmitter on the tower and loaded them into a database. The software that I used showed a “fifth-order” intermodulation product caused by three transmitters that would cause a signal to be generated on 146.13 Mhz. Recognize that frequency? It’s the INPUT to 146.73."

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