Re: What are the Proposed Radio Frequencies for the Broken Hill? What are the Satellite Frequencies?

[mauried@commslab.gov.au (Maurie Daly)]

In article <mauried.255.3771E62A@commslab.gov.au> mauried@commslab.gov.au (Maurie Daly) writes:
>From: mauried@commslab.gov.au (Maurie Daly)
>Subject: Re: What are the Proposed Radio Frequencies for the Broken Hill? What
>are the Satellite Frequencies?
>Date: Thu, 24 Jun 1999 08:02:50 GMT

>In article <7ksnlq$2tek$1@otis.netspace.net.au> "Robert Parnell"
><rparnell@netspace.net.au> writes:
>>From: "Robert Parnell" <rparnell@netspace.net.au>
>>Subject: Re: What are the Proposed Radio Frequencies for the Broken Hill? What
>are the Satellite Frequencies?
>>Date: Thu, 24 Jun 1999 17:46:56 +1000


>>> >
>>> What will the frequencies be for the link from the locomotive to the
>>> satellite & vice-versa??  Will it be in the 418-420mhz range or a higher
>>or
>>> lower frequency?? If so what is this frequency??
>>>
>>> Thanks, GF

>>The satellite-loco frequencies are in the microwave range - that is - GHz.
>>The 408-419MHz range is for the terrestrial communications between the loco
>>and track-side radio base.

>>Robert Parnell
>>Rail Access/Railcom Technician, Electronics Enthusiast,
>>Lachlan Valley Railway Director,  NSW HO scale railway modeller
>>E-mail:<rparnell@netspace.net.au>


>If the locos are talking to Optus Mobilesat, which is about the only option 
>available, Mobilesat uses L band , 1500-1520 Mhz approx , SCPC 
>channels digital modulation .
>Unfortunately you cant listen in .
>When I get back to work Ill get the exact frequencies for the uplink and 
>downlink.

>MD

The frequencies used for Mobilesat are as follows.
Uplink ie from Train to Satellite 1646.5 Mhz to 1660.5 Mhz
Downlink from Satellite to Train 1545.0 Mhz to 1559.0 Mhz

For those of you who are superbly keen and want to listen to the satellite 
uplink the frequencies are

Earth Station to Satellite 14011.5 Mhz to 14025.5 Mhz
Satellite to Earth Station 12263.5 Mhz to 12277.5 Mhz.

Does the SRA have their own Earth Station ??

There is no switching in the satellite so all calls have to go via 2 hops , ie
train - satellite - earth station - train control.
Reverse is 
Train Control - Earth Station - satellite  - Train.

MD