Come on...someone please say it...Most all radios built for FM use on commertial and or amature bands are designed for a MAXIMUM of +-5Kc deviation, period! Most receivers are built for +-7.5 Kc band width. What is to be gained from running higher than design deviation? What you gain is a Radio that sounds like crap if it can be heard.. and that "pops" out of the bandwidth of most receivers... and interferes with any co-chanel radios. This person should have his license grant reviewed. I CAN'T BELEAVE THIS IS COMMING FROM AN EXTRA !!! Gee Gang, Stop beating around the bush
73 AC0Y --- In [email protected], mch <[EMAIL PROTECTED]> wrote: > The 'correct' maximum depends mostly on your neighbors when it comes to > the ham band, but you should never run so much as to interfere with > adjacent channels. If you are operating in a 15 kHz bandplan where the > next adjacent channel above and below you is 15 kHz away, you should run > not more than 4.5 kHz deviation (resulting in a 15 kHz bandwidth). That > leaves no room for frequency error, but if you're on frequency, and your > neighbors are, too, it will help minimize any problems. > > If you're in a 20 kHz spacing area, 6 kHz may work OK. You would have a > bandwidth of 18 kHz. That would allow for up to 0.5 kHz of frequency > error on both your part and that of your neighbors. Running 5 kHz > deviation would give you both 1 kHz to play with for frequency error > since your bandwidth would be only 16 kHz. > > If you're running UHF in Ohio, give it up - you only have 12.5 kHz to > deal with. That means a technical maximum of 3.25 kHz deviation (12.5 > kHz bandwidth). You may as well convert to SNFM (2.5 kHz deviation). > > That said, some receivers, particularly scanners, are now designed with > much more narrow filters in them that will cut off at 17 kHz. That means > listening to your system on one of those will sound choppy on voice > peaks if you're running at 6 kHz deviation, or an 18 kHz bandwidth. So, > sticking with 5 kHz is the best bet. It will retain compatibility with > commercial specs (who are limited by law to 5 kHz maximum deviation for > NBFM). > > Joe M. > > mbloom0947 wrote: > > > > Dear John, > > > > Thank you for the helpful feedback. I can be a bit pig-headed at > > times. I really wasn't sure exactly what deviation to set. I did > > monitor other repeaters and they are as wide as I mentioned. Having > > said that, I will adjust the deviation back to 5 KHz max if that is > > best practice. > > > > Michael Bloom, W7RAT > > > > > > Yahoo! Groups Links > > > > > > > > > > > > -- > > No virus found in this incoming message. > > Checked by AVG Anti-Virus. > > Version: 7.0.296 / Virus Database: 265.6.2 - Release Date: 12/20/2004 > > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.296 / Virus Database: 265.6.2 - Release Date: 12/20/2004 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/
