This is true,
Neil McKie - WA6KLA
Fred Seamans wrote:
>
> To Jim & et all:
> Actually there is a reason that Motorola and GE (now M/A-COM ) used a
> reverse CTCSS tone burst. The Hi-Q solid state tone detectors that are used
> by these manufactures have a ring down time delay, the same as trying to
> stop a mechanical reed after removal of the driving tone. The design of the
> solid state detector dictates the amount of phase shift of the CTCSS tone
> that is ideal to stop the ring down of the Hi-Q networks. Both Motorola and
> GE used the amount of phase delay that worked best with their design. It was
> not to make other brands function poorly.
> Fred
> W5VAY
> ----- Original Message -----
> From: "Jim B." <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Friday, October 29, 2004 1:45 PM
> Subject: Re: [Repeater-Builder] TKR-740 versus TKR-750 (Was: Maggiore's
> Service)
>
> >
> > Eric Lemmon wrote:
> >
> > > Unfortunately, the TKR-740 receiver cannot properly respond to
> > > a Motorola reverse burst, but that is a deficiency that I can live
> > > with. (Geez, I wish Ham radios could encode and decode reverse burst!)
> > >
> >
> > That's actually Motorola's fault. I think they and M/A-Com are the only
> > ones who use other than a 180 phase shift for revese burst, and they do
> > it deliberately to make other brands not sound as good on their systems.
> > --
> > Jim Barbour
> > WD8CHL
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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