Message	Date	From	Subject
9253	2013-10-15 07:37:43	Ashhar Farhan	Fm transmitter for a repeater
Nbfm generates infinite sidebands. Thus, their broadband noise too will be high. Does it make sense to generate nbfm at a lower frequency, pass it through a 15 khz filter and then upconvert? The aim is to reduce receiver desensing. A high Performance receiver will be used. - farhan -- Sent from my mobile device
9262	2013-10-18 01:57:53	ha5rxz	Re: Fm transmitter for a repeater
You may find the following document to be of use: http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&sqi=2&ved=0CEkQFjAH&url=http%3A%2F%2Fliterature.agilent.com%2Flitweb%2Fpdf%2F5954-9130.pdf&ei=ofVgUpHFFcW54ASfloHgBw&usg=AFQjCNEDGkmGWQBzIK1Id1Z_JucIx2gTXA&bvm=bv.54934254,d.bGE&cad=rja The interesting stuff starts at page 16 where they say: In practice, the spectrum of an FM signal is not infinite. The sideband amplitudes become negligibly small beyond a certain frequency offset from the carrier, depending on the magnitude of β. We can determine the bandwidth required for low distortion transmissi

You may find the following document to be of use:

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&sqi=2&ved=0CEkQFjAH&url=http%3A%2F%2Fliterature.agilent.com%2Flitweb%2Fpdf%2F5954-9130.pdf&ei=ofVgUpHFFcW54ASfloHgBw&usg=AFQjCNEDGkmGWQBzIK1Id1Z_JucIx2gTXA&bvm=bv.54934254,d.bGE&cad=rja

The interesting stuff starts at page 16 where they say:

In practice, the spectrum of an FM signal is not infinite. The sideband amplitudes become negligibly small beyond a certain frequency offset from the carrier, depending on the magnitude of β. We can determine the bandwidth required for low distortion transmissi