In my experience, it is unfair to compare a hardware TNC with a sound card interface. The sound card seems to be able to decode a much broader range of signals than the hardware TNCs. This is based on KPC-3+, TinyTrak4, and T2-135 hardware TNCs. Once the radio levels are tuned well, the TT4 and T2-135 (v1.2 only) can come close to what I was getting from AGWPEpro, but the sound card still consistently decoded 10-25% more packets even when fed by the same radio via an audio Y cable.
That being said, I've still retired the sound card system and am using a TinyTrak 4 as my IGate (KJ4ERJ-2/-7) and T2-135s with Nuvi 350s as my trackers (KJ4ERJ-9 and KJ4ERJ-14). I just couldn't justify the overhead of keeping a windows PC alive and WIRED to a radio connected to an antenna on a tower in the lightning capital of the world (Florida). With the TT4, I'm using a Bluetooth to serial connection between the TNC and the javAPRSsrvr server so there's an ultimate air-gap protection there. Your mileage may vary, but the DSP power of a computer with sound card was always better in my experience. Lynn (D) - KJ4ERJ w6cjq wrote: > > > Hi so I am a proud new owner of a T2-301 Prior to this I was using a > west mountian sound card interface with a FT8800. So here is what I > have noticed. I set the T2-301 up and got it talking through the com > port on my computer. I use Ui View 32 and noticed that I was not > seeing a lot of traffic. I turned on my HT and heard a lot of traffic > on 144.39 but the T2-301 only seems to pass about every 5th or so > transmission to UI-View 32. The stations do show up on the map and I > can transmit a query through the T2-301 it just seems to be real > selective about what it here and sends to the com port. > > I also monitored the unit in hyper terminal and the same amount of > traffic appeared > > Any thoughts on this?? > >
