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<font face="Arial, Helvetica">I should have looked in the manual further
:-) Looks like I can run the TM1+ in NMEA mode and simply select a
transmit timer value, so it does not continue to broadcast EVERY sentence
the TM1+ gets from the GPS. <br>
In my case, the TM1+ can look for the header ($GPRMC) and I then either
set the sentence length or termination character and it will be sent out
the radio port at intervals set by my Tx timer value. <br>
73s Jack VK4JRC<br><br>
<b><i>From the Tigertronics TM1+ Manual:<br><br>
NMEA Mode<br>
This mode was designed primarily for GPS<br>
tracking applications, where entire NMEA sentences need to<br>
be sent. However, this mode can also be used in any<br>
application where the desired data is identified by a known<br>
preamble (header). In operation the incoming data is<br>
searched for a predefined string (Data Header). When the<br>
string is received, the unit starts storing data in its buffer. It<br>
continues to store data until a user specified termination<br>
character is received or until the buffer overflows. The<br>
buffer length is 105 characters. This is sufficiently long to<br>
store any NMEA string. The user can program up to three<br>
Data Headers to search for. A header can be up to six<br>
characters long. The unit searches for and transmits each<br>
header in sequence. A transmit timer is provided in this<br>
mode so that data can be transmitted at any user-defined<br>
interval between 1 second and 68 minutes. NMEA Mode<br>
allows the user to configure up to ten different “Profiles”,<br>
each with it’s own SSID, Digi Path, Transmit Timer Interval,<br>
TX Delay and Tail Delay.<br>
Delay and Tail Delay. The other information used by these<br>
modes (MyCall, ToCall, etc.) is shared among all of the<br>
profiles. Each profile can be selected by the user in the field,<br>
without the need for a computer. This is useful in situations<br>
where the operator is driving from one area to another, and<br>
needs to switch the Digi path from a local path to a more<br>
generic one. It is also a convenient way to change timer<br>
intervals for changing situations, like when you are no longer<br>
moving.<br><br>
</i></b></font><blockquote type=cite class=cite cite>I would think that
for HF you'd want the shortest packet possible,<br>
so make sure you're not sending GPRMC strings over the air. Try
for<br>
Base-91 or Mic-E format packets instead if the TNC's will do
that.<br><br>
That said, the TNC needs to receive GPRMC sentences from the GPS in<br>
order to get course/speed, and GPGGA sentences to get the
altitude.<br><br>
I don't know whether that info will help you, but each little
bit<br>
of knowledge might get you closer to a solution.<br><br>
-- <br>
Curt,
WE7U.<x-tab> </x-tab><x-tab> </x-tab><x-tab> </x-tab><x-tab> </x-tab>archer
at eskimo dot com<br>
<a href="http://www.eskimo.com/~archer" eudora="autourl">http://www.eskimo.com/~archer</a><br>
Lotto: A tax on people who are bad at math. - unknown<br>
Windows: Microsoft's tax on computer illiterates. - WE7U.<br>
The world DOES revolve around me: I picked the coordinate
system!"<br><br>
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