--- "Gregg R. Lengling" <[EMAIL PROTECTED]> wrote:
> Using tones below 60 Hz usually doesn't work for 2 > reasons. #1 reason is that the transmitter will not > reproduce that low of a tone without distortion and > overdriving....and the receiver audio won't recover > it. #2 the lower the frequency the longer it takes > to decode.....I realize it's not a great amount of > time difference with todays uP decoders but it is > still slower. To operate tones at very low > frequencies you would need a NRZ modulator to get > decent response. > > Gregg R. Lengling, W9DHI, Un-Retired > K2/100 SN 3075 > http://www.milwaukeehdtv.org > Most newer FM type transmitters will handle tones down to 15 Hz or below, the problem with transmitters might only occur with some of the older PM types. Most RX's will work OK down to DC, if you tap the discriminator at the right place. Any radio that will modulate or demodulate DPL will work for these lower tones, since DPL has some components that are down in the sub 15 Hz range. You are correct that they will most likely take longer to decode. Joe __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
