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Tim,<br><br>
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.<br><br>
From SCS Manual:<br><br>
<font face="Arial, Helvetica"><b>The DSPTNC supports the following
Packet-Radio operating modes:<br>
</b></font><font face="Arial, Helvetica">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 ±400 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 ±240 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>
</font><font face="Arial, Helvetica"><b>Highlights of the
Modem-Implemtations in the DSPTNC:<br>
</b></font><font face="Arial, Helvetica">Generally very reliable and
“flicker free” DCD achieved with special DCD algorithms on the<br>
signal processor.<br>
</font><font face="Arial, Helvetica" color="#FF0000"><b>New developed
multi-detector for 300 Bd AFSK. The signal processor automatically<br>
processes a frequency range of ±400 Hz looking for 300 Bd transmissions
and receives all<br>
detected signals in parallel.</b></font><font face="Arial, Helvetica">
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 </font><font face="Arial, Helvetica"><b>DCD-LED
</b></font><font face="Arial, Helvetica">can be used for that purpose. It
lights </font><font face="Arial, Helvetica" color="#00FF00">green
</font><font face="Arial, Helvetica">if the actually<br>
received packet has a frequency error of less than +-40 Hz, otherwise it
</font><font face="Arial, Helvetica" color="#FF0000">lights
</font><font face="Arial, Helvetica">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>
</font><font face="Arial, Helvetica">Whilst these units are not cheap,
they work very well as an HF IGATE unit, due to their off freq decode
ability.<br><br>
</font>73,<br><br>
Jack VK4JRC<br><br>
At 04:38 PM 1/11/2010, you wrote:<br>
<blockquote type=cite class=cite cite="">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@yahoo.com.au>:<br><br>
> Hi Tim,<br>
>
Do you want this for mobile use or base station ?<br>
> <br>
> 73 Phillip<br>
> ZL2TZE<br>
> <br>
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