[OZAPRS] APRS Databusrt

Peter Mudie peter at mudiefamily.org
Sat Aug 11 16:30:15 EST 2007


Hi Ray,

The 5.4MHz offset came up in discussion with with John Martin a 
number of years ago.  It wasn't so much following from any commeical 
split but more a pairing that made sense band plan wise, and also 
allwoed for 2 receivers 400kHz apart to be run (just) through the 1 
band pass cavity.

He proposed it to allow pairing of 432.625 - 433.000 inputs with 
repeater outputs 438.025 to 438.400MHz to allow for a clean LIPD free 
input to a repeater.

All the repeater input channels above 434.79Mhz are used in Sydney 
basin with standard -5MHz offset repeaters, so there are some 
repeaters applying for 438.025-438.400MHz outputs and running the 
normal -5MHz receiver with CTCSS (other than 123 Hz as 123Hz is 
spooked by wideband FM music content) and a -5.4MHz receiver with no 
CTCSS to provide a clean receiver with no LIPD desense.

Peter




At 14:15 11/08/2007, Ray Wells wrote:
>Peter Mudie wrote:
>
> >Hi Ray,
> >
> >432.625 - 433.000 is being used as -5.4MHz inputs to voice repeaters
> >to avoid LIPDs in Sydney.
> >
> >Peter.
> >
> >
> >
> >
> >>431.275 - 431.975 RESERVED (Note 9)
> >>432.625 - 433.000 RESERVED (Note 9)
> >>
> >>Quote ...
> >>Note 9: Reserved Segments
> >>These band segments are reserved for possible future use in the event
of
> >>further band allocation changes or increasing
> >>LIPD problems. Until otherwise allocated they may be used for any
purpose.
> >>
> >>Ray vk2tv
> >>_______________________________________________
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> >>Ozaprs at aprs.net.au
> >>http://aprs.net.au/mailman/listinfo/ozaprs
> >>
> >>
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> >>10/08/2007 3:50 PM
> >>
> >>
> >>
> >>
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> >>10/08/2007 3:50 PM
> >>
> >>
> >
> >
> >
> >
>Hello Peter,
>
>There is probably a number of "area specific" arrangements in use around
>the country now as the 70cm band gets attacked for a variety of reasons.
>
>5.4MHz offset? That's one of a number of offsets that was used
>commercially many, many years ago.
>
>Ray vk2tv
>_______________________________________________
>Ozaprs mailing list
>Ozaprs at aprs.net.au
>http://aprs.net.au/mailman/listinfo/ozaprs
>
>
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>No virus found in this incoming message.
>Checked by AVG Free Edition.
>Version: 7.5.476 / Virus Database: 269.11.13/946 - Release Date: 
>10/08/2007 15:50

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