[aprssig] Mobile Success With APRS Messenger PSK-63 on 30 Meters
Stephen H. Smith
wa8lmf2 at aol.com
Fri Mar 5 14:54:08 CST 2010
On 3/5/2010 5:03 AM, Chris Moulding wrote:
> I'm working on the GPS mobile tracker version of APRS Messenger over
> the weekend. All being well it should be ready for your trip.
> Tx PTT will be on the existing com port and the GPS input will be any
> other serial or USB port. GPS input will be 4800 bd NMEA looking for
> the $GPRMC string.
> I'll post information on APRSSIG when it's ready.
> Chris, G4HYG
1) I am using a VOX-keyed soundcard interface so the PTT com port
isn't an issue to me. However, TXD is, since some VOX devices are
"slow on the draw". To guarantee that they are fully keyed before the
data starts, it would be good to allow 50-100 milliseconds or so of tone
before any data starts.
Details of my homebrew tone-keyed interface (which keys in 5
milliseconds) are here on my website:
A good commercial alternative that is also tone-keyed, and needs no
serial port control, is the TigerTronics SignaLink at:
The "USB" version of this device is actually an entire second card
dedicated to ham purposes in a box at the end of a USB cable. It
"automagically" shows up as "Generic USB Sound Device" when plugged into
a USB port on any system running Win 2K or higher. No driver installs
required at all!
2) I use the "XPort" com port splitter to share my GPS data with
several programs at once. If you maintain the COM1 through COM16 range
of choices for the GPS input as well as for the current TNC/PTT choice,
there should be no problems.
3) Would it be possible to cause all the radio button choices on the
startup screen to be saved into an .ini file? It would be very
convenient to have these settings be "sticky". Especially now that one
has to check the correct tone each time. (And I, at least, have to
choose a non-default sound card each time since my system has three of
them, and will soon also be having to choose the GPS port each time ).
In the mobile environment, one is constant starting up and shutting
down. I use the UIview Scheduler to automatically start up several
related programs each time I start UIview. However, currently I have to
start Messenger separately and manually, since it's start-up requires
operator interaction each time.
4) Yet another tone freq request (!!). I use a TigerTronics
TigerTrak APRS tracker on classic FSK AX25 HF. The TigerTrak uses the
oddball tone pair of 1100 and 1300 for 300 baud HF mode. I would like
to be able to beacon with both the Tigertrak on FSK, and APRS Messenger
on PSK63 with the same setup. This would require a tone frequency of
1600 Hz for Messenger, if running on USB.
Do the 700 Hz and 1500 Hz tones have any special significance? In
Europe perhaps??? Could they be dropped in the interest of
simplicity? I would also think that labels to the right of whatever
tones remain might be useful to minimize user confusion. Something like:
O 1300 Hz - Radio on 10.151.00 LSB for KAM
O 1600 Hz - Radio on 10.148.10 USB for TigerTrak
O 1800 Hz - Radio on 10.151.50 LSB for AGWpe Free
O 2100 Hz - Radio on 10.147.60 USB for KAM
I realize this assumes everyone is on 30 meters -- perhaps there could
be a "Hide/Show HInts" check box.......
Stephen H. Smith wa8lmf (at) aol.com
EchoLink Node: WA8LMF or 14400 [Think bottom of the 2M band]
Home Page: http://wa8lmf.net
NEW! Universal HF/VHF/UHF Antenna Mounting System
"APRS 101" Explanation of APRS Path Selection & Digipeating
Updated "Rev H" APRS http://wa8lmf.net/aprs
Symbols Set for UI-View,
UIpoint and APRSplus:
More information about the aprssig