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

Frank or Barbara Rossi n3flr at bellatlantic.net
Sat Feb 20 17:39:58 UTC 2010


Wow, greatest thing for HF APRS yet !
It has all the benefits of PSK.
Signals way down in strength still decode.
I downloaded the program and have it running near Pittsburgh Pa.
I hear KD4MOJ-6 and was able to send a message this morning.
Almost a pipeline from Pittsburgh to Florida this morning !

I like the idea of using the 2100 hz version in the USA.
Being able to have the receiver set to the same frequency as AX25 APRS,
allowing simultaneous RX AX25 APRS with a TNC and PSK APRS with the 
sound card is a major  plus.
I think this could take off big time.
Best advance for HF APRS in years.
Perhaps the 2100 hz version should be the standard version ?
I have not tried the different frequency versions yet or what the RX 
dial settings should be.
My guess is that it depends on what TNC you have for AX25 APRS, what the 
tone freqs are ?
Thanks for the great program.
Your time and effort put into this program will be appreciated by all.
There will be more people on HF APRS because of this program.
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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