I've gone so far as to make a couple of "changes" to a Motorola MSR2000 to not
send reverse burst, and hold the transmitter a little longer than a normal
reverse burst -- that is to say, chicken burst. That was a different
application, what I'll do next time I deal with a Micor or MSR with a Zetron
(which may be never) -- that is to say, use a factory card just to get the
extra carrier hang with no reeds in it and jumpered as if there were no card :)
On Nov 20, 2009, at 9:24 AM, wspx472 wrote:
> Thanks for the useful info. Very interesting. On a somewhat similar topic, we
> ran into a situation where the local Motorola shop sold a local entity a
> repeater and several portables using a DPL code that only certain models of
> Motorola have. We checked every Kenwood, Vertex, and even some other Motorola
> models and none could do this particular code.
> I found a work around for the lack of reverse burst. I am using a Tait
> exciter which has its own hang timer. I just set that timer to hold the
> carrier up for a fraction of a second after the 38A drops out. This gives the
> PL decoder in the mobiles/portables time to close the squelch before the
> carrier drops.
>
> --- In Repeater-Builder@yahoogroups.com, wd8chl <wd8...@...> wrote:
> >
> > Eric Lemmon wrote:
> > > The TS-64 does indeed encode a reverse burst STE signal. Unfortunately, it
> > > has the 180-degree phase shift, because that is really easy to do. It
> > > cannot encode a 120-degree phase shift, so that means it is fairly useless
> > > with Motorola and a few other radio brands. When I contacted Comm Spec
> > > about this a few years ago, the engineer I spoke with seemed not to know
> > > that there are two standard reverse burst formats.
> > >
> > > 73, Eric Lemmon WB6FLY
> > >
> >
> > I wouldn't be too worried about it. An awful lot of Motorola's will do
> > OK with 180 shift, especially higher-tier radios.
> > But then there's some that are just weird. I have a Maxar-80 on GMRS. It
> > doesn't like the Com-Spec TP-3200 tone panel. It also doesn't like the
> > P-100 handheld on talkaround. But it does like the GE MPA and Phoenix-SX
> > I have. Go figure.
> > The Micor repeaters with a factory reed decoder however, seem to be
> > pretty liberal on what they respond to. Just about any radio with RB
> > will be at least partially muted. The TK-805D has a really short delay
> > on the STE drop out, so the decoder doesn't get a chance to fully spin
> > down before the transmitter goes away. But just about any other radio
> > worked OK.
> > I'd leave it, frankly.
> >
>
>
--
Cort Buffington
H: +1-785-838-3034
M: +1-785-865-7206
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