Regarding Observation 4190205 …
The latest AMSAT news contained the item copied below. The synthesized voice can be heard in this audio file at 2:59.
PSAT2: DTMF and APRS-to-Voice enabled
A new feature has been enabled for the Voice Synthesizer on PSAT2
in addition to DTMF grid and DTMF messaging to voice. Now the voice
synthesizer is also listening for APRS-to-Voice messages as well.
Here is how to use it
- Remain on the 145.980 uplink and 145.825 downlink for DTMF
- Using an APRS radio, send an APRS message to PSAT-SAY
- Begin the first 10 chars of the message with CCCCCC sez
- Followed by the text to be spoken.
- CCCCCC is your callsign right-padded with spaces.
The satellite should ACK the packet uplink and then speak the text. You can
tell if APRS-to-Voice is enabled if this 1 bit is on: XXXX0010. Usually the
DTMF bits are also enabled so the telemetry will usually show as 11010010.
To do both DTMF and APRS-to-Voice at the same time, the Basic Stamp
processor has to check both the DTMF decoder and the packet decoder and so
there is a finite chance that a perfectly good uplink might be missed. So,
just try again.
See http://aprs.org/psat2.html Tomorrow I will add this feature to the users
manual and post it.
Enjoy, Bob, WB4APR