[OZAPRS] 300 baud TNC

[Scott Evans]

Hmm... I'm sure that not many are going to explore that path!... (but a
nice present non the less!)

Oh and can someone donate one for my 40m HF gate! (Joking)


On Mon, 2010-01-11 at 17:46 +1000, Jack Chomley wrote:

> 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-LEDcan be used for that purpose. It lights greenif
> the actually
> received packet has a frequency error of less than +-40 Hz, otherwise
> itlightsred.
> 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
> > > 
> > > _______________________________________________
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> > > 
> > 
> > 
> > 
> > 
> > 
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> 
> 
> 
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--
Scott Evans VK7HSE
Phone: +61362291658
Mobile: +61417586157
Skype: vk7hse
scott at vk7hse.hobby-site.org
http://www.vk7hse.hobby-site.org
PGP/GPG Key ID 437E00F9

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