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[aprssig] PSK31 PSK63 In Use on 30 Meters

Stephen H. Smith wa8lmf2 at aol.com
Thu May 10 18:15:27 UTC 2012

On 5/10/2012 1:35 PM, Andrew Rich wrote:
> Is PSK31 popular for APRS ?
> - Andrew -

Not PSK31, but PSK63  (twice the speed) *is* used with a dedicated sound card 
application   "APRS Messenger".    See my web page at

. <http://wa8lmf.net/APRS_PSK63>

for details.   This is used primarily on the 30 meter-band at 10.149.700    --  
two hundred Hz above the upper tone for classic AX.25 packet-based APRS.

(FSK tone pair for 300 baud AX.25 HF packet APRS is 10.149.200 Mhz / 
10.149.4500 Mhz.)    The two systems are so close that they can be received 
simultaneously in the passband of a normal HF/SSB rig.  In fact I am receiving 
both modes at once through a 500 Hz CW filter on USB on my TS-440, with the 
passband tuning cranked way high to pass the audio range from 1600 Hz to 2100 Hz.

The APRS Messenger app is a combination of a PSK/GMSK sound card soft TNC, an 
APRS messaging client and an igate/digipeater function in a single program.  It 
doesn't do mapping itself, but can be linked via TCP/IP to any normal APRS 
client such as APRSis32, UIview, APRSpoint, etc for mapping displays.

Note that the APRS Messenger program encapsulates a typical APRS payload with 
standard packet-style headers and checksum before modulating the PSK or GMSK 
carrier.  As a result, normal PSK programs such as Digipan or MixW can't 
inter-operate with APRS Messenger.   At the current time, Messenger can only 
talk with other copies of itself.   However it is incredibly more effective on 
weak noisy bands than classic 300-baud HF AX.25 packet.       Igates are 
already operating in North America and Europe for this new mode, but I don't 
know about AU and NZ.



Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
Home Page:          http://wa8lmf.net

High-Performance Software-Only Packet TNC

High Quality Calibrated Static Maps for Any APRS App

  Vista & Win7 Install Issues for UI-View and Precision Mapping

"APRS 101"  Explanation of APRS Path Selection & Digipeating

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