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You have to control the levels so that the transmitter doesn't get
driven into deviation limiting. Usually testing is done at 60% of system deviation. I am assuming this is a land mobile transmitter? Connecting a tone generator to the microphone terminals is best way to control the test. chuck wrote: In making FM transmitter distortion measurements, does anyone inject the 1 kHz audio signal into an FM transmitter by holding the microphone next to a speaker? It would seem that neither speaker nor microphone would produce enough distortion of a single frequency to affect the results, and in any case, the microphone is part of the system being tested. The idea would be to avoid having to fiddle with the variety of microphone connectors out there. I suppose I can and should compare the results of this technique with applying the audio signal directly to the microphone input terminal. Appreciate any thoughts. TIA. Chuck NT3G ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P |
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