Actually, after a bit of digging it appears the hardware used in all versions of the Telemetrum v1 boards were identical. I could be wrong but it appears they all used the TI CC1111F32 radio chipset so I expect my TeleMetrum v1.2 to not support APRS.
Regards, Andrew On Wed, Aug 8, 2018 at 3:11 PM, Plugger Lockett <[email protected]> wrote: > FANTASTIC! Thanks for the prompt response Keith. > > Can you also confirm if the TeleMetrum v1.2 is/isn't APRS capable? I'd > check it myself but I've loaned my TeleMetrum v1.2 to a local AURC > University team to give them some homebrew altimeter/tracker ideas. AURC is > effectively an IREC equivalent competition down here. > > Also, if by chance I'm having telemetry down-link issues (similar to my > other thread) via the AltOS proprietary protocol you and Bdale designed is > it safe to assume that the APRS transmission is a fully redundant/separate > transmission system? Or another way to put it, if I've got APRS enabled and > I can't get a telemetry down-link connection working successfully via > either AltOS, TeleGPS app, or AltusDroid will the APRS beaconing work fine > and the flight get logged locally onto onboard storage (assuming there are > no stored flights onboard already) for me to download later? > > Basically I want to have the option to fall back to APRS for tracking if > required and still have the flight fully recorded locally via eeprom if I > can't get my live telemetry link working in the field. > > Thanks again for all of your help. > > Andrew > > On Wed, Aug 8, 2018 at 2:30 PM, Keith Packard <[email protected]> wrote: > >> Plugger Lockett <[email protected]> writes: >> >> > Hi Keith, >> > >> > Apologies for spamming the mailing list but I've had some time today to >> > look into a few things and that's brought up a couple questions. >> > >> > Above you mentioned that it's possible to have both APRS and the >> telemetry >> > digital protocol running concurrently on some systems. After consulting >> the >> > manual it appears the option is available only on TeleMetrum v2 and >> > TeleMega boards. To confirm, the TeleGPS (v1 or v2) aren't capable of >> APRS? >> > I'd have a look at my TeleGPS v1.0 board but I'm in the office at the >> > moment. >> >> TeleGPS, both v1 and v2, can also send APRS. The only devices which >> could not are TeleMetrum v1 boards which used a radio part incapable of >> the long transmission times necessary for APRS. >> >> > In the Altusmetrum manual you mention "a single APRS packet takes >> nearly a >> > full second to transmit, so enabling this option will prevent sending >> any >> > other telemetry during that time." Given that do you have any >> > recommendations regarding transmission frequency? I'd expect once every >> 5 >> > seconds would suffice and still leave a decent chuck of transmission >> for in >> > flight telemetry. But any advice would be appreciated. >> >> That's what I use. Note that APRS is sent during ascent, unlike the RDF >> beacons which are suppressed during that portion of the flight. >> >> > Finally, I expect to use my Yaesu VX-8GR for ground station/APRS TNC >> > duties. I use it for Big Red Bee comms and it works fine. Given the >> > documentation comments on APRS Format I expect to need to enable the >> > compressed format as you highlight it as a requirement for comms with >> the >> > newer Yaesu FT1D. But the TeleMega screenshot in the manual doesn't >> show a >> > line for "APRS Format". Just confirming that if I do have a device >> that's >> > APRS capable the configuration for the "APRS Format" field would indeed >> > reside in the "Configure Altimeter" window. >> >> Yes, you should see APRS Interval, APRS SSID and APRS format fields in >> the 'Configure Altimeter' window. >> >> Let me know if there's something wrong with the UI in your case; I've >> just checked with TeleGPS v1.0 and AltosUI running 1.8.6. >> >> -- >> -keith >> > >
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