NOAA 15 - SABADO 2 DE OCTUBRE - PASE DE LA TARDE

SATELITE OSCAR 67 - SO 67 - SUMBANDILLA - ESTARA ACTIVO - HORARIO UTC - 16 y 17 de OCTUBRE para el Jamboree of the Air

FREQUENCIES

UPLINK
145.875 MHz

DOWNLINK
435.345 MHz

ACTIVATION TONES
Transponder
233.6 Hz

Parrot
218.1 Hz

SUMBANDILASAT  Operating hints

The PTT of the transmitter now STAYS ON for the duration of the payload activation (i.e. 15 min), regardless of a valid “transponder” tone received.  Note that this does not get rid of the “cut-off” problem, nor of the requirement to embed a valid tone when you want to use the payload – see detailed explanation below. 

The following example depicts the ideal usage scenario of the payload:

1. As the satellite comes over the horizon, an unmodulated carrier (“quieting”) will be received by all on UHF

2. Person A starts to transmit on VHF (with valid “transponding” tone embedded in the transmission) and the transmission is relayed on UHF

3. When Person A releases his/her PTT, the satellite will continue to transmit what it is receiving (usually this will be “noise”) for a further ±3s.  Nobody should start to transmit during this time!

4.0 At the end of the ±3s period, everybody will again hear the unmodulated carrier.

5. NB: only when this unmodulated carrier is heard should Person B start to transmit.  Listen to this mp3 recording as an example of valid usage
A repetidora no modo FM a bordo do satélite africano Sumbandila Oscar 67 (SO-67) estará ativa sobre a America do Sul nos dias 16 e 17 de outubro para os participantes do Jamboree no ar (JOTA).

De acordo do a informação do vice presidente de operações da AMSAT-NA Drew Glasbrenner, KO4MA, o satélite estará disponível por 15 minutos para que todas as estações possam manter contatos e pedimos a todos que deixem a freqüência livre para que as estações participantes do Jamboree mantenham contatos.

Os horários de ativação do satélite serão os seguintes:

16 outubro: 10:39, 12:12, 13:37, 15:09, 16:42, 18:14, 19:47, 21:20, 22:38, 22:54, 23:55

17 outubro: 00:14, 01:28, 01:44, 03:00, 03:19, 04:55, 06:35, 10:20, 11:53, 13:15, 13:32, 14:50, 16:23, 17:56, 19:29, 21:01, 22:35
O satélite SO-67 possui Uplink em 145.875 FM com sub tom 233.6 e downlink em 435.345 FM.

MAURICIO BERALDO PY4MAB
Py4mab@amsat.org
http://br.groups.yahoo.com/group/ISSFANCLUBEBRASIL/