No subject
Fri Nov 13 00:14:42 EST 2009
<br>
<b><span style=3D'font-family:"Arial","sans-serif"'>The DSPTNC supports =
the
following Packet-Radio operating modes:<br>
</span></b><span style=3D'font-family:"Arial","sans-serif"'>Parameter =
Mode<br>
300 300 Bd AFSK (old HF-Packet-Radio standard)<br>
TX center frequency default at 1700 Hz (1600 Hz “Space“, =
1800 Hz
“Mark“).<br>
RX center frequency: 1700 Hz =B1400 Hz, automatically tuning<br>
R300 200/600 Bd Robust-Packet-Radio (RPR), automatic selection of =
speed.<br>
TX center frequency fix at 1500 Hz<br>
RX center frequency: 1500 Hz =B1240 Hz, automatically tuning<br>
UI-packets (APRS, Unproto) are transmitted with 200 Bd RPR.<br>
R600 Like R300, but UI-packets (APRS, Unproto) are transmitted with 600 =
Bd RPR.<br>
1200 1200 Bd AFSK.<br>
9600 9600 Bd Direct-FSK (G3RUH).<br>
19200 19200 Bd Direct-FSK (G3RUH).<br>
<br>
<b>Highlights of the Modem-Implemtations in the DSPTNC:<br>
</b>Generally very reliable and “flicker free” DCD achieved =
with
special DCD algorithms on the<br>
signal processor.<br>
<b><span style=3D'color:red'>New developed multi-detector for 300 Bd =
AFSK. The
signal processor automatically<br>
processes a frequency range of =B1400 Hz looking for 300 Bd =
transmissions and
receives all<br>
detected signals in parallel.</span></b> Exact tuning by the user is not
necessary any more as a perfect<br>
tuning on the receiver side is always achieved automatically. If manual =
tuning
of the RX frequency<br>
is desired, the <b>DCD-LED </b>can be used for that purpose. It lights =
<span
style=3D'color:lime'>green </span>if the actually<br>
received packet has a frequency error of less than +-40 Hz, otherwise it =
<span
style=3D'color:red'>lights </span>red.<br>
Special transmit- and receive filters for 1200 Bd AFSK, to avoid =
adjacent
channel interference<br>
and degradations by AC hum.<br>
Adaptive DC-removal by the signal processor at 9600 und 19200 Bd =
Direct-FSK.<br>
<br>
Whilst these units are not cheap, they work very well as an HF IGATE =
unit, due
to their off freq decode ability.<br>
<br>
</span>73,<br>
<br>
Jack VK4JRC<br>
<br>
At 04:38 PM 1/11/2010, you wrote:<br>
<br>
<o:p></o:p></p>
<p class=3DMsoNormal>Thanks for the replies guys, I have two things in =
mind. 1) a
crossbanded HF to <br>
VHF tracker, I have now got the Codan NGT running with a TT3 and would =
like to <br>
be able to use a portable tracker away from the vehicle, i have a =
Kenwood HT <br>
with a gps and TT3 attached to it that goes great in a backpack. Both =
the KAM <br>
and the SCS dsp seem to be able to do this.<br>
2) Be able to use it at home to be able to "see" hf stations,
possibly even <br>
using it as a temporary/semi permenant 40m gate.<br>
The SCS dsp is definately an option as a new unit, possibly better than =
the <br>
Kantronics ? They are both fairly close in pricing. The tracker 2 would =
<br>
definately do just fine for home but can it have 2 radios and baud rates =
at the
<br>
same time ? I will look it up ! I have also just stumbled accross a KAM =
plus on
<br>
ebay that finished yesterday and went for $ 143 us.<br>
Cheers Tim VK2HLT<br>
<br>
Quoting Phillip <zl2tze at yahoo.com.au>:<br>
<br>
> Hi Tim,<br>
> &nb=
sp;
Do you want this for mobile use or base station ?<br>
> <br>
> 73 Phillip<br>
> ZL2TZE<br>
> <br>
> _______________________________________________<br>
> OZAPRS mailing list<br>
> OZAPRS at aprs.net.au<br>
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href=3D"http://lists.aprs.net.au/mailman/listinfo/ozaprs">http://lists.ap=
rs.net.au/mailman/listinfo/ozaprs</a><br>
> <br>
<br>
<br>
<br>
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