[OZAPRS] 300 baud TNC

[Jack Chomley]

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
> >
>
>
>
>
>
>------------------------------------------------------------
>This email was sent from Netspace Webmail: http://www.netspace.net.au
>
>_______________________________________________
>OZAPRS mailing list
>OZAPRS at aprs.net.au
>http://lists.aprs.net.au/mailman/listinfo/ozaprs

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.aprs.net.au/pipermail/ozaprs/attachments/20100111/62c3ff27/attachment.htm