I just received my new T2-135 board and installed it in my Alinco
radio. It seems to work on the transmitting side, but the receiving
side is abysmal! I read back through the group's messages and was
reminded of the solder reflow issue that was going on back in June and
wondered if that's what I might be afflicted with. Here's my
benchmarking and current results.
1) ICOM HT with audio to Line In to AGWPEpro to javAPRSSrvr - Ran this
way for quite some time and was decoding packets from 1/2 way across
Florida, routinely and consistently. The IGate was KJ4ERJ.
2) Replaced HT with Alinco continuing with the Line In to AGWPEPro and
javAPRSSrvr - I've been running this for just about a week now, until
this today when I received the T2-135. The IGate continued as KJ4ERJ
and continued to have almost the same coverage as observed with the HT.
If I can hear the WC4PEM-nn Digis directly, I know things are working well.
3) Installed the T2-135 card into the radio and reconfigured a
javAPRSSrvr to speak KISS directly to the serial port. This
configuration set the IGate callsign to KJ4ERJ-2. I initially didn't
see ANY packets being received by this IGate. This was not good.
4) Connected a terminal to the T2-135 and turned MONITOR ON and also
enabled DigiPeating. I put the old HT on a rubber duckie (my tower only
has one antenna) and hooked it back up to AGWPEpro to monitor what was
going on. I saw every beacon transmitted by the T2-135 (low power for
these tests) as well as a few DigiPeated packets. These also showed up
in the monitor window, but it was only for the two closest stations
(KE4OZD-1 and W4GCW-2) that I've always received. NONE of the more
distant stations even showed a trace in the monitor, not even the
closest Digi WC4MLB-3.
5) Put the T2-135 back into KISS mode and hooked it back into
javAPRSSrvr, keeping the DigiPeating enabled. I continued to see only
those same two stations' beacons and javAPRSSrvr's gate counters tracked
them exactly. This confirms that KISS was, in fact, working.
6) I turned the digipeating back off but kept the T2-135 in KISS mode
with javAPRSSrvr. I continued to only see the same two stations being
gated to the Internet and no other traffic on the KISS serial link.
7) Put the audio connection back into the Alinco with AGWPEpro doing the
decoding an I'm already decoding packets from digis K4PKT-3, WC4MLB-3
(which the T2-135 didn't seem to hear even though it's close and
strong), and WC4PEM-13.
Is it possible that there's a setting I have wrong that causes the
T2-135 to not report every packet that is received (possibly ignoring
digi-peated packets?), or is it truly not decoding them? Is there any
way I can find out any performance numbers? I just wish the Alinco had
a way that I could monitor the sounds on 144.390 while still having the
T2-135 actively decoding them!
After searching the group for "Sensitivity" and "Decoding", I noticed
the solder issues from June. I then visually inspected the T2-135 under
a magnifying glass and it appears that the center pin on the left side
(board edge) of the 2211 chip, the 4th pin down from the marker dot in
the case, is a dull solder joint. All of the other pins' connections
are nice and shiny, but that one is not. Could that be causing my lack
of decoding sensitivity or is it just a "feature" of the T2-135 (which I
would find hard to believe based on others' experiences posted on this
Let me know what I can try and I'll give you feedback as I go. In the
meantime, I'm back to the audio connection to the Alinco using AGWPEpro,
but I'd really like the direct serial KISS link!
Lynn (D) - KJ4ERJ
> Is it possible that there's a setting I have wrong that causes theNo, monitor mode should show all packets with the right PID and a
> T2-135 to not report every packet that is received (possibly ignoring
> digi-peated packets?), or is it truly not decoding them? Is there any
correct FCS checksum.
> (board edge) of the 2211 chip, the 4th pin down from the marker dot inThe problem doesn't seem to be bad solder joints, I think it's excessive
> the case, is a dull solder joint. All of the other pins' connections
> are nice and shiny, but that one is not. Could that be causing my lack
> of decoding sensitivity or is it just a "feature" of the T2-135 (which I
> would find hard to believe based on others' experiences posted on this
flux residue on the board. You can try washing it with some rubbing
alcohol and drying it thoroughly, or you can send it back and I'll check
Also, try changing the wide/narrow setting on the radio. Some users
have reported that having an effect on decode rates.