Motorola's 900 MHz Hear-Clear product is different from other manufacturers' audio improvement technologies because it combines companding with a patented second feature known as "Flutter-Fighter" which rapidly varies IF gain in response to flutter induced by Rayleigh fading.
For VHF and UHF NBFM radios, although each manufacturer may have different companding parameters, radios of various brands may be more closely compatible than they are at 900. Audio companding is certainly a subject that should be researched in a study of the migration of amateur VHF/UHF operations to NBFM. ---------------------------------------------------------------- --- In Repeater-Builder@yahoogroups.com, wd8chl <wd8...@...> wrote: > > Chuck Kelsey wrote: > > And I doubt any ham rigs have these added features. > > > > Chuck WB2EDV > > And wouldn't be compatible with the Motorola's anyway. It's been run > into on 900 already-a radio with hear clear turned on doesn't talk well > with a Kenwood with their compandoring method turned on. > Everybody has their own way to do it... > > > ----- Original Message ----- From: Cort Buffington To: > > Repeater-Builder@yahoogroups.com Sent: Saturday, October 03, 2009 > > 8:45 PM Subject: Re: [Repeater-Builder] Narrow(er) band FM > > > > Eric, > > > > > > My goal was to not employ any additional "trickery" to make the > > things sound better -- to test it with as many things being equal as > > possible. Once we get a feel if there's a real-world "range" > > difference, I'll throw in the extras and try again. Thanks for > > pointing this out -- I wasn't really clear that I wasn't going to > > enable features designed to improve the super-narrow setting. > > > > > > 73 DE N0MJS >
