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[aprssig] APRS Messenger now has APRS over PSK-63

Frank or Barbara Rossi n3flr at bellatlantic.net
Sun Feb 28 17:41:18 UTC 2010


Trying to get APRS Messenger and UI-View using the AGW Packet engine 
APRS dial frequencies to line up.
Currently using the 2100 Hz version of APRS Messenger with the dial set 
at 10.1476 on USB.
Several stations and I have exchanged messages, works great.
I figure if I could get the dial frequencies to line up, I could I-Gate 
AX25 APRS and PSK-63 APRS at the same time,
same radio and same computer.
The AGW Packet engine will only decode tones 2100/2300.
With dial set at 10.1476 on USB AX25 tones are to low to decode without 
changing dial frequency, and then PSK-63 APRS is off frequency.

Should I be using a different version of APRS Messenger to get the tones 
to line up ?
Also What would the dial frequency and USB/LSB be ?

What would the dial frequencies be for the different versions of APRS 
Messenger ?
I figure all versions are compatible with each other with different dial 
settings ?
Thanks
N3FLR - Frank


On 2/18/2010 5:20 AM, Chris Moulding wrote:
> I've released the latest version of the APRS Messenger v 2.26 program.
>
> The biggest change is that APRS over PSK-63 has been added. This has 
> been tried
> before with an add-on to UI-View but that had problems sending packets 
> with
> errors to the APRS-IS system. I've added a preamble, start and stop 
> flags and a
> strong checksum to each packet so that each received packet is checked 
> as correct
> before being sent to the internet.
> The display will show all packets received even with errors so that 
> weak signals
> can still be read manually. A frequency hopping routine has been added 
> to the PSK-63
> receiver to allow rapid signal acquisition over a +/- 50 Hz range. A 
> Tune option
> allows the operator to send a carrier + 150 Hz in frequency to avoid
> interference to other APRS over PSK-63 users. The program uses the PC 
> soundcard
> in a similar way to other digimode programs.
>
> The program comes in three versions with different PSK-63 audio tone
> frequencies, 700, 1300 and 2100 Hz.
>
> The second change is the addition of a receive only Igate. All HF or 
> VHF packets
> received can be sent to the APRS-IS. If the connection to the APRS 
> server is
> lost it automatically retries 1 minute later.
>
> Future developments will include a GPS option for mobile HF tracking.
>
> If you want to try APRS over PSK-63 on HF I'm running an Igate on 10.1497
> MHz. Set your receiver to a dial frequency of 10.1476 MHz USB with the 
> 2.1 kHz
> version. Please note that the dial frequency is the same as used for 
> existing HF
> 300 bd packet APRS so it will work with existing HF APRS set-ups. In 
> the US
> Lynn KJ4ERJ is also running an APRS over PSK-63 Igate on 10.1476 MHz.
>
> The software is freeware and can be downloaded from the following 
> webpage:
>
> http://www.crosscountrywireless.net/aprs_messenger.htm
>
> A Yahoo group for discussion on this and other topics:
>
> http://uk.groups.yahoo.com/group/cross_country_wireless
>
> See you on the waterfall!
>
> 73,
>
> Chris, G4HYG
>
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