[OZAPRS] 300 baud TNC

[Mike Zwingl oe3mzc]

this is really the only choice for short wave!
  ----- Original Message ----- 
  From: Jack Chomley 
  To: Australian APRS Users 
  Sent: Monday, January 11, 2010 8:46 AM
  Subject: Re: [OZAPRS] 300 baud TNC


  Tim,

  One of the great features of the SCS DSP tracker is its ability to decode off frequency signals on HF. The older TNCs cannot do this at all.

  From SCS Manual:

  The DSPTNC supports the following Packet-Radio operating modes:
  Parameter Mode
  300 300 Bd AFSK (old HF-Packet-Radio standard)
  TX center frequency default at 1700 Hz (1600 Hz "Space", 1800 Hz "Mark").
  RX center frequency: 1700 Hz ±400 Hz, automatically tuning
  R300 200/600 Bd Robust-Packet-Radio (RPR), automatic selection of speed.
  TX center frequency fix at 1500 Hz
  RX center frequency: 1500 Hz ±240 Hz, automatically tuning
  UI-packets (APRS, Unproto) are transmitted with 200 Bd RPR.
  R600 Like R300, but UI-packets (APRS, Unproto) are transmitted with 600 Bd RPR.
  1200 1200 Bd AFSK.
  9600 9600 Bd Direct-FSK (G3RUH).
  19200 19200 Bd Direct-FSK (G3RUH).

  Highlights of the Modem-Implemtations in the DSPTNC:
  Generally very reliable and "flicker free" DCD achieved with special DCD algorithms on the
  signal processor.
  New developed multi-detector for 300 Bd AFSK. The signal processor automatically
  processes a frequency range of ±400 Hz looking for 300 Bd transmissions and receives all
  detected signals in parallel. Exact tuning by the user is not necessary any more as a perfect
  tuning on the receiver side is always achieved automatically. If manual tuning of the RX frequency
  is desired, the DCD-LED can be used for that purpose. It lights green if the actually
  received packet has a frequency error of less than +-40 Hz, otherwise it lights red.
  Special transmit- and receive filters for 1200 Bd AFSK, to avoid adjacent channel interference
  and degradations by AC hum.
  Adaptive DC-removal by the signal processor at 9600 und 19200 Bd Direct-FSK.

  Whilst these units are not cheap, they work very well as an HF IGATE unit, due to their off freq decode ability.

  73,

  Jack  VK4JRC

  At 04:38 PM 1/11/2010, you wrote:

    Thanks for the replies guys, I have two things in mind. 1) a crossbanded HF to 
    VHF tracker, I have now got the Codan NGT running with a TT3 and would like to 
    be able to use a portable tracker away from the vehicle, i have a Kenwood HT 
    with a gps and TT3 attached to it that goes great in a backpack. Both the KAM 
    and the SCS dsp seem to be able to do this.
    2) Be able to use it at home to be able to "see" hf stations, possibly even 
    using it as a temporary/semi permenant 40m gate.
    The SCS dsp is definately an option as a new unit, possibly better than the 
    Kantronics ? They are both fairly close in pricing. The tracker 2 would 
    definately do just fine for home but can it have 2 radios and baud rates at the 
    same time ? I will look it up ! I have also just stumbled accross a KAM plus on 
    ebay that finished yesterday and went for $ 143 us.
    Cheers Tim VK2HLT

    Quoting Phillip <zl2tze at yahoo.com.au>:

    > Hi Tim,
    >              Do you want this for mobile use or base station ?
    > 
    > 73 Phillip
    > ZL2TZE
    > 
    > _______________________________________________
    > OZAPRS mailing list
    > OZAPRS at aprs.net.au
    > http://lists.aprs.net.au/mailman/listinfo/ozaprs
    > 





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