Ed, You sure about that? I'm skeptical. If I turn off the GPS, I can't even access the 2820's internal GPS functions (the third menu page is not accessible, so I can't access the position displays at all). Furthermore, sending NMEA data to the serial port sends it out over the air regardless of whether the GPS is turned on or off.
Have you actually tried this and got it to work? I just did (including sending NMEA data to the radio via the serial port), and it does not work. It's possible I am missing something. Brian On Sat, 2010-02-20 at 22:03 +0000, Woodrick, Ed wrote: > > Brian, > > > > The IC-2820 has a serial input just like the ID-800 or ID-880. If you > want to send data in this port, all you need to do is to turn off the > internal GPS and the port is available EXACTLY as if it was a ID-880. > So by just faking the GPS serial stream, you can make the internal > distance and direction functions come to life. > > > > Although personally I would think that it would be infinitely more > useful if D-RATS were used and then all of the position reports would > be presented on an easy to see screen, as opposed to the harder to see > screen of the IC-2820 which switches when you talk. > > > > Ed WA4YIH > > > > From: [email protected] > [mailto:[email protected]] On Behalf Of Brian Mury > Sent: Saturday, February 20, 2010 2:59 PM > To: [email protected] > Subject: Re: [DSTAR_DIGITAL] Fooling the GPS firmware in an IC2820 to > display position data without a GPS sig > > > > > > > I disagree with all the other posters who said this is possible and > easy. > > This would be easy with an ID-800 or ID-880; they do not have an > internal GPS, and rely on a serial NMEA feed from an external GPS. The > IC-2820 has a GPS inside the radio (on the UT-123 D-STAR board). What > you plug in is not an external GPS - it is just a GPS antenna. What > you > want to do would require either simulating the RF transmission from > several GPS satellites, or injecting the feed into an appropriate > place > inside the radio (assuming it uses serial NMEA internally - I don't > know > if it does). > > If you want to send and receive position reports via a computer, then > this is simple and can already be done, but it sounds like you want to > use the radio's GPS features, which is a different matter. > > 73, > Brian > VE7NGR > > On Fri, 2010-02-19 at 16:09 +0000, jkvochick wrote: > > > > I have a 2820 installed in a place where receiving a GPS signal > would > > be very, very, difficult. > > > > Sadly, without receiving a valid GPS signature, some of the other > cool > > features, like distance to station doesn't work. > > > > Since this radio is installed in a fixed location, I was wondering > if > > you could inject an appropriate rs232 signal from say an Arduino > > microprocessor board, so that the internal units believed they had > > valid psiiton data? > > > > Jim WB8AZP > > > > > > > > > > > > > >
