I don't have a TT4 on hand to look at, so I don't know where it is exactly, but the bank switch input should be labeled JP1. You have to allows the TT4 to use the BANK input in the configuration, otherwise I believe it defaults to BANK 0?
-----Original Message-----
From: Bear Albrecht <W5VZB.NM@...>
To: [email protected]
Sent: Wed, Jun 23, 2021 4:32 pm
Subject: Re: [TinyTrak] How can I do this? toggling between two APRS messages.
OK, I'm looking at the TT4 hardware manual and I have yet to figure out what to ground-or-not ...? The word "bank" doesn't appear in that document at all.