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
>
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> Yahoo! Groups Links
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>
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