Re: [Repeater-Builder] tone trivia..?

[Kevin Custer]

I have to interject here... Gregg R. Lengling 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 Your statement Gregg that "the' transmitter will not reproduce that low of a tone without distortion" is generalizing that all repeater transmitters are incapable of response below 60 Hz.  I have tested many repeater transmitters and can verify that 'most' station exciters that employ FM modulation will easily do 33 Hz at standard PL deviation levels.  These include the PLL Mastr II, FM Micor, Mitrek, MSR-2000, Hamtronics synthesized PLL, and certainly many more modern repeaters that are synthesized. and overdriving.... ??  Explain your use of the term overdriving in your statement. and the receiver audio won't recover it. Huh?  Receivers that can do DPL can easily detect a 33 Hz PL tone, and I don't know of any receiver I have ever tested that wouldn't receive a DPL properly from the discriminator.  a 33 cycle PL tone at 750 Hz transmitted deviation isn't a problem for the receiver to recover.   #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. Agreed....   To operate tones at very low frequencies you would need a NRZ modulator to get decent response. Since the modulation of a PL tone is a sine wave, what benefit would be realized by utilizing a NRZ (non-return-to-zero) type modulator? Kevin Custer   Gregg R. Lengling, W9DHI, Un-Retired K2/100 SN 3075 http://www.milwaukeehdtv.org ----- Original Message ----- From: James To: Repeater-Builder@yahoogroups.com Sent: Saturday, December 04, 2004 7:54 PM Subject: Re: [Repeater-Builder] tone trivia..? Many of the tones that tha Com-Spec TS64 series borads will do are non-standard tones (per EIA).  Has anyone used any of these?? especially the low ones like 33 Hz?? 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 the Yahoo! Terms of Service.