Voice synthesized telemetry is interesting. ARISSat-1 sent telemetry values in voice in its downlink. Have any others? I know several Japanese satellites have had digitalkers, but as far as I know, they use static messages.

73,

Paul, N8HM

On Fri, May 28, 2021 at 10:51 AM Martin Davidoff [email protected] wrote:

And the ball keeps bouncing. Congrats! Reminds me of a conversation I had with Martin Sweeting at an AMSAT meeting in DC about 45+ years ago. I was showing him a new hi-tech (!) 4 function hand calculator that my college had just purchased ($ 500.+) for use by blind students and suggesting that the new voice synthesizer chip might be placed on a satellite and used for downlink telemetry. It would of course reduce the data rate from about 3 characters per second (Morse code) to 1 character per second but would greatly expand access to potential users. Those were the days. Again, Congrats. Martin Davidoff (K2ubc)

On Fri, May 28, 2021 at 3:23 AM Yono Adisoemarta via AMSAT-BB < [email protected]> wrote:

...

Hi Bob,

Works really good over here several minutes ago, 07:05 UTC pass over Jakarta, Indonesia.

Thanks for the great job, 73 de Yono - YD0NXX

Sent from my iPhone

On May 28, 2021, at 12:05 PM, Robert Bruninga [email protected] wrote:

 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

1. Remain on the 145.980 uplink and 145.825 downlink for DTMF
2. Using an APRS radio, send an APRS message to PSAT-SAY
3. Begin the first 10 chars of the message with CCCCCC sez
4. Followed by the text to be spoken.
5. 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

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Spaces dont show up well in email. yes, a 5 letter call has to have a space as the 6th letter of the call plus the space that separates the call from "sez". A four letter call has to have two (+ the one for separating the "sez" Bob

On Fri, May 28, 2021 at 6:21 PM [email protected] wrote:

Just to clarify, by right padded, you mean spaces after the call sign, Correct: (K7TEJ sez)? Rick Tejera

Saguaro Astronomy Club www.saguaroastro.org Thunderbird Amateur Radio Club www.w7tbc.org

From: Robert Bruninga [email protected] Sent: Thursday, May 27, 2021 22:05 To: amsat bb [email protected] Cc: Robert Bruninga [email protected] Subject: [AMSAT-BB] 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

1. Remain on the 145.980 uplink and 145.825 downlink for DTMF

2. Using an APRS radio, send an APRS message to PSAT-SAY

3. Begin the first 10 chars of the message with CCCCCC sez

4. Followed by the text to be spoken.

5. 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