I bought two OT2m's. I hooked one to a Yaesu FT-1900 in my shack and watched it try and decode packets. It is having a hard time.
I also have a PK-232 on a IC-229H running UI-View 32 and it is decoding fine at the same time. I thought I just am having a "learning" experience with the OT2m. Is there something I can do, or check to improve the decoding. We were going to put this combo in the southern part of the county to give it better Digi coverage. But not yet. thanks, Kent KQ4KK From: [email protected] [mailto:[email protected]] On Behalf Of Mike Zwingl oe3mzc Sent: Sunday, September 13, 2009 11:55 AM To: [email protected] Subject: Re: [tracker2] Tracker2/Display & poor decoding Scott, I guess you are talking abt C13 and C17 ? When you replace them, do you see improved decoding? sorry for the hassel. vy 73 de Mike oe3mzc ----- Original Message ----- From: Scott Miller <mailto:[email protected]> To: [email protected] Sent: Sunday, September 13, 2009 4:42 AM Subject: Re: [tracker2] Tracker2/Display & poor decoding Hi Mike, I'm kind of fed up with the 2211 myself. I've been doing a lot more testing on the OT2ms before they ship these days, and a significant portion of them need to have the 0.027 uF capacitors replaced before they ship. I'm not sure the batch sent to the contract manufacturer is really meeting specs. I haven't run into any that didn't get up to par with the capacitor replacement and a thorough cleaning of flux residue. Still, it's a lot of hassle. I've got a few boards on the way to test a new MX614-based layout. When those come in (sometime late in the week) I'll start doing some side by side comparisons. Assuming I can get my crashed workbench PC up and running again. I already bought a replacement, but I can't run the software I need under Vista, and I can't get the machine to load XP Pro. Scott Mike Zwingl oe3mzc wrote: > > > Hi, > we have exactly the same problem and we are no newbies to packet radio > modems. > The XR2211 decoder should perform much better, than it sometimes does in > OT2m. > This modem chip is also used in some other tncs... > but I did not change it for an TCM3105 or similar in the OT2m -so far no > time to test this... > However we observe many OT2m units, that show POOR DECODE on 1200baud on > different radios and locations. > Some only decode less than one third of all heard packets..we do not > know why... > However, we have also seen some OT2m units that do significantly better > than that, running same firmware. > We are also aware of the wrong capacitor in the audio filter circuit of > some OT2m serial No. batches, but even if we soldered the correct C > it is still showing very odd effects with poor decode and digipeater > performance. > We would be glad to have some solution offered, since OT2m is starting > to get widely used in our national APRS network as an intelligent > digipeater > or replacing old tncs, that could not do the NEWn-n paradigm. > > hw? > vy 73 de Mike > oe3mzc > > > > ----- Original Message ----- > *From:* Mark Cheavens <mailto:[email protected] <mailto:mcheavens%40usa.net> > > *To:* [email protected] <mailto:tracker2%40yahoogroups.com> <mailto:[email protected] <mailto:tracker2%40yahoogroups.com> > > *Sent:* Thursday, September 10, 2009 3:31 PM > *Subject:* Re: [tracker2] Tracker2/Display & decoding > > > > With the modem chip used it is rare that a "weak" or "noisy" signal > will get decoded. Is the audio "packet" 9600, 1200, or speaker audio? > > With 1200 baud packet you need to have de-emphasized (sp?) audio to > the modem (TNC). Speaker audio DOES have de-emphasis, as should a > "1200" baud port of the radio. > > (FYI- 9600 had NO pre- or de- emphasis) > > Just because you can HEAR a packet, does not mean the TNC can decode > it. The signal to noise radio need to have a LOT of signal, and VERY > little noise. > > Mark > KC5EVE > > > At 01:02 AM 9/10/2009, you wrote: > >> >> >> Hi there, >> >> I've Tracker2 connected to a Nuvi350 and was wondering why >> sometime it >> took a while before I could see some of the callsigns get into the >> Favorite (after I did a delete all). So, I added an LCD display to my >> Tracker2 yesterday and found out that most of the time, Tracker2 >> couldn't decode the packets (i.e. not displayed on the LCD) >> especially >> the weak ones. Now I'm wondering what else I need to do .. Anyway, my >> setup is .. Kenwood TMV71A/Data/BandB <-> Tracker2 with LCD <-> Nuvi. >> I brewed my own cable between the TMV71A and the Tracker2.. sending >> packet out does not seem to be a problem. Is there anything in the >> configuration that I need to do? >> >> TIA, >> Mohd/9W2TPT > >
