When I was working HF packet (at 110 baud) back in the early 1980's, I found that I did generally make my PACLEN to 40 and MAXFRAME to 1 and my ID was k5yfw-3775 or what ever I was using. If conditions were really good, I set the PACLEN to 76 (72-76 characters is what is recommended for standard message text) and a MAXFRAME of 2.
I wish I would have had the ability to automatically vary the PACLEN and MAXFRAME when signals varied. 73, Walt/K5YFW -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of Patrick Lindecker Sent: Wednesday, December 20, 2006 4:09 PM To: [email protected] Subject: Re: [digitalradio] 110 Baud Packet and 20M test Hello John, RR for all about you experimentation. I recommend the following: to do 110 bauds Packet, set the options PACLEN to 40 and MAXFRAME to 1. For calls, it is advised to put the RS ID on duty to allow the other Hams to identify the mode and the exact frequency. PACLEN to 40 so as to limit the duration of the frames and the probability of bit error. Surely 20 or 30 would be perhaps better. MAXFRAME to 1 because is useless to send more than one frame as in HF the probability to have a failure is high. And because if you send several frames, as there is no selective "REJECT" in AX25, you are going to send again all your frames good or not... Note: this apply to connected 110 bauds Packet. In APRS, you have no choice: you send only one frame with all the position and weather information, included the message. 73 Patrick ----- Original Message ----- From: John Bradley To: [email protected] Cc: Terry White Sent: Wednesday, December 20, 2006 7:52 PM Subject: [digitalradio] 110 Baud Packet and 20M test Terry, VE5TLW and I were using (fooling with?) 110 baud packet this AM on 20M. Should be noted that we are about 1km apart, although I switched over to my dummy load and reduced power so he was hearing me at S3, or just above his noise. Couple of observations; *Had to change the Dwait values and TXdelay values to 80 , (found under "options")increasing the delay slightly seemed to work better, although some of that could be due to desensing the rigs a bit, being so close. * After a connect, when sending a test text file, 110 baud sent the entire file in one long packet. worked Ok * After listing each other in the repeater list ie VE5MU-0, then the other station would repeat the beacon message when in APRS beacon mode. Would not repeat connect attempts. repeater needs a fairly good signal to work. Interesting mode, and very interested in how it will work under poor conditions. So , as of 1830Z, have my rig on 14077USB, and sitting on 1000hz. Beacon every 3 minutes, and the responder on , and a "test" message stored in message 1. Will leave it on for the next couple of hours and see what happens. Later will try setting it up as a repeater, where you would list VE5MU-0 as a repeater then TX your beacon message and see if you can hear it coming back will try 3590 this evening, too John VE5MU
