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<DIV><FONT face=Arial size=2>this is really the only choice for short
wave!</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=radio@irock.com.au href="mailto:radio@irock.com.au">Jack Chomley</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ozaprs@aprs.net.au
href="mailto:ozaprs@aprs.net.au">Australian APRS Users</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, January 11, 2010 8:46
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [OZAPRS] 300 baud TNC</DIV>
<DIV><BR></DIV>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 class=cite cite="" type="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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