Is there a way to set up my TT3+ to send APRS to the ISS ?
Generally, unattended one-way tracking devices are discouraged from the packet satellites and the ISS to limit uncontrollable QRM... Live Operator operations, contacts, messages, and QSO's are preferred.
There are of course, exceptions, for example, one year we tracked a Ham driver of a vehicle delivering goods over Ice rivers in Northern Canada above the arctic circle. There was a scientific expedition to Mongolia this year and we wanted to send along a tiny tracker with WX station attached but could not get it ready in time. Then there was the student project of a remote WX station on a ski-pole in Antarctica, and an Igloo WX station by an experiment also in the arctic circle..
Then of course are the student experiments that might want to demonstrate remote environmental data from a remote device (we ran one for a week 2 years ago at the 5W level) to quantify the link reliability (1 packet every 2 minutes).
In general, if you think your experiment is suitable, then we recommend a routine long term packet period using 5W at about one packet per 2 minutes. This gives you about 3 good chances at one packet per pass. But also include in your packet, some contact information. Such as your email address. Exceptions to the email requirement could be:
1) if your callsign (on the device using a different SSID) is also permanently maintaining a presence on APRS somewhere, they you can be contacted that way, since any APRS message to that callsign will be delivered to all of your other callsign stations too.
2)if you maintain a forwarding email address @amsat.org (for satellite operations or @arrl.net for terrestrial operations).
PATH: you should use is VIA ARISS, since when PCSAT-1 is operational (there will be a period in Feb maybe) it also supports that path, so you get 12 passes a day, not just 6.
Hope that helps.
For more info on APRS via ISS please see: www.aprs.org/iss-faq.html
And read the User Service Agreement for packet operations via PCSAT-1. This applies to PCSAT, but could also apply to packet operations via the ISS digipeater also on the same channel 145.825. www.aprs.org/pcsat/contract.txt
We continue to encourage more AX.25 digipeater satellites on 145.825 to serve as a continuing worldwide CQ, Contact and Data channel for remote operations.
Bob, Wb4APR