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Re: [tracker2] tracker2 working but not igate

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  • Scott Miller
    I don t know if I d consider it a shortcut - for most data modes it would make sense to transmit flat. Pre-emphasis is just for voice noise reduction. It s
    Message 1 of 8 , Jan 2, 2012
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      I don't know if I'd consider it a shortcut - for most data modes it
      would make sense to transmit flat. Pre-emphasis is just for voice noise
      reduction. It's just that the 'standard' is to use pre-emphasis for
      APRS since we're using so many voice radios.


      On 1/2/2012 4:42 PM, Matthew Cook wrote:
      > Hmm... Thanks for that Scott...
      > That might explain a few things why my TH-D72 is not being heard by some
      > of my local digi's reliably, I know the TNC's they are using do not like
      > demodulating flat audio tones (MFJ1270b's).
      > Very naughty of Mr Kenwood to take a short cut... I bet they are
      > injecting both the 1200/9600 tones into the same point in the audio
      > path... tisk tisk tisk.
      > 73's
      > Matthew
      > VK5ZM
      > On Tue, Jan 3, 2012 at 5:15 AM, Scott Miller <scott@...
      > <mailto:scott@...>> wrote:
      > In my experience, this is very often a problem with pre-emphasis. I'm
      > not sure about the VX8, but I know that the Kenwoods transmit flat - the
      > 1200 and 2200 hz tones are of equal deviation. Most other radios
      > (unless you're using the 9600 baud data port) apply 6 dB/octave of
      > pre-emphasis, so the 2200 hz tone is louder. The reverse is done on the
      > receive side, and some demodulators don't deal with the twist very well.
      > I've noticed this with one of the local digis here. It picks up my
      > IGate (now running a T3) fine if I use the mic input, and not well at
      > all if I use the data jack.
      > Scott
      > On 1/1/2012 10:12 PM, Robert Lane wrote:
      > > This question is not totally related to the Tracker2 but it is a
      > piece
      > > of the puzzle. I recently bought a VX8GR (KB8ZXE-7) and have been
      > > testing it out. I made a trip to the Ironwood Michigan area to visit
      > > family and brought the VX8 along. For some reason the iGate in
      > Ironwood
      > > (AB8ZJ) won't pick my VX8 up directly. It will however gate
      > traffic from
      > > my radio to the internet if and only if it goes through another digi
      > > first. There is a digi in Wakefield a few miles away (KB8ZXE-1)
      > and the
      > > Ironwood iGate will pass traffic all day long to the internet from my
      > > VX8 as long as it goes through the Wakefield digi first. The
      > Wakefield
      > > digi is an OpenTrcker2 running as a fill-in digi.
      > >
      > > In fact I was at my buddies apartment in Ironwood on his roof
      > looking at
      > > an antenna install. I manually sent several position packets and the
      > > only one that got gated to the internet went through (WALES) Wales MN
      > > some 90 miles away and then back to the Ironwood iGate.
      > >
      > > So from the sounds of it my VX8GR is working fine. AB8ZJ appears
      > to be
      > > working fine for other mobiles and fixed stations. I was picking
      > up the
      > > other stations digipeated packets from AB8ZJ as well. What is keeping
      > > AB8ZJ from dumping my packets to the internet. I believe he is
      > running
      > > UIview32 as a digi and an Igate. I should have tried changing the
      > path
      > > on my HT but I was running WIDE1-1 (only). This really cut down
      > on the
      > > APRS coverage for me in a big way and I would like to come up with a
      > > solution
      > >
      > > This might be a lot to swallow but please read it over and
      > message me if
      > > you have any ideas. I leave town tomorrow so I probably won't
      > have time
      > > to test anything.
      > >
      > > Thanks
      > > Bob
      > > KB8ZXE
      > >
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