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13485Re: T2-135 Digipeating Issues

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  • Gil
    Jan 13, 2012
      This is in regard to an older message of mine. I was having trouble with my T2-135 system digipeating my D72 HT. I have since switched off the D72 with my older D7A. That seems to have made a significant difference in whether I'm digipeated by my own home station (WB2UTI-1). It's much more reliable with the D7 (into the same amplifier and antenna) than the D72 was.

      Is anyone aware of any difference in the tone quality or de- or pre emphasis situation between the two radios? I'm not aware of any adjustments I can make in the D72 that would affect the tones.

      Gil, WB2UTI

      --- In tracker2@yahoogroups.com, Scott Miller <scott@...> wrote:
      > Hi Gil,
      > Try connecting to the T2-135 with a terminal program to watch the
      > traffic. You can also check the INFO command to see if it has
      > digipeated a packet. And make sure you've got profile switching
      > disabled - if you get it set up wrong, it'll dump the RX buffer every
      > time it switches profiles.
      > If the T2-135 can hear your D72, and the nearest IGate can hear the
      > T2-135, then it's most likely a configuration problem.
      > Scott
      > On 11/30/2011 2:44 PM, Gil wrote:
      > > I have a T2-135 system that I've had for a few years. It has always
      > > worked pretty well. It is presently running as a fill-in digi at my
      > > house (responding to WIDE1-1 and my call sign, WB2UTI-1) using build
      > > 55863. The transmitter is running about 9 - 10 Watts out to a 6 dB gain
      > > antenna about 15 feet above ground level in my attic (I'm in an antenna
      > > restricted community - and if I run much more power, it sets off my
      > > smoke alarms - but that's another problem altogether...).
      > >
      > > My community is also set up for "golf cart" access to almost everywhere,
      > > so,naturally, when I got one myself, it had to have a radio/APRS beacon
      > > in it. I manage that with a Kenwood D72 and an external antenna mounted
      > > on the cart (with enough of a ground plane to get less than 1.5:1 for an
      > > SWR). I even recently put a Mirage dual band amplifier into that system
      > > to be sure that I was getting enough power out to be heard. I increased
      > > the tranmitter delay on the D72 to be sure the amplifier was up to full
      > > output before getting the packet data.
      > >
      > > Here's my problem. When I'm out in that vehicle, most of the time I
      > > don't seem to be getting digipeated by my own home station and most
      > > other digipeater stations are far enough away that I don't usually get
      > > heard by them (that was the whole point of putting up a fill-in digi at
      > > my house). What is particularly frustrating is that if I hook up the
      > > Alinco radio to APRSPoint (I like the Microsoft maps...) and track
      > > myself (WB2UTI-7) when I'm out and about in the golf cart, when I get
      > > home and check it, the display map shows every beacon I sent and it
      > > traces my path perfectly. But if I go to aprs.fi, I'm lucky to get maybe
      > > two position reports (out of 25 - 30) for the same trip. So the radio
      > > seems to be hearing and decoding me OK and passing that along to
      > > APRSPoint, but more often than not, it's not digipeating me (my path in
      > > the D72 is WB2UTI-1,WIDE1-1,WIDE2-1). I have the home station set to
      > > beacon occasionally and aprs.fi hears every one of those beacons, so I
      > > know that radio is capable of hitting the nearest I-Gate.
      > >
      > > I'm running pretty much the default smart-beacon profile on the D72
      > > radio and the beacons are not more frequent than two minutes or so at
      > > the shortest (so I don't think they're coming in too frequently for the
      > > digipeater to respond). I only rarely get the acknowledging two tones in
      > > the radio to indicate that a digipeater has heard and repeated me and
      > > when I do, it's occasionally when some distant digipeater has heard me.
      > > I do hear and decode other stations on my D72 so I think that's working
      > > OK. I do get the acknowledgement when I'm close to home, but even then,
      > > those beacons don't necessarily show up on aprs.fi (packet collisions on
      > > the output of my home station?).
      > >
      > > As for settings on the T2, I have WIDE1-1 enabled for digipeating as
      > > well as digipeating on my call in both profiles (which are identical).
      > >
      > > I understand that packet collisions occur but I would not have expected
      > > that to be the majority case for most beacons sent by my mobile station
      > > or for my home station. I'm outside the high traffic area where I used
      > > to live.
      > >
      > > Any thoughts on what might be going on here? I know it's probably
      > > something obvious that I've overlooked.
      > >
      > > Thanks,
      > >
      > > Gil, WB2UTI
      > >
      > >
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