Rick, we are doing a bit better on speeds with RFSM8000. We sometimes get up to 3200.
Maybe it depends on the bandwidth available. I open my transmitter to 3 kHz and my receiver even wider. Have not tried on FM / VHF yet but hope to do that soon. Even at 600 or 1200 it is so much faster than the alternatives that nothing compares to it. I don't have an SCS modem so that is not an alternative to me. This is valuable when sending messages or files. We had bad band conditions this evening and I was able to receive a 29k spreadsheet in 11 minutes and 40 seconds. The Broadcast feature of the RFSM8000 version allows you to chat without being connected. This could be used to run a net. Howard Brown (The other Howard) ________________________________ From: Rick W <[EMAIL PROTECTED]> To: digitalradio@yahoogroups.com Sent: Tuesday, December 2, 2008 10:58:12 PM Subject: Re: [digitalradio] You Have Mail Re: How Can We Push Emcomm Messages to the Field? Howard, Appreciate your comments on RFSM. Not many have tried it. I have found the speed to be very similar to what you have been experiencing. Even with my experimental set up here in the shack with two computers/two rigs, it does not often get much above 1000 bps with a perfect "path." This is using the RFSM2400 freeware program. The RFSM8000 product seems to be more oriented to the higher speeds, but does not meet the slower MIL-STD-188- 110A 75 bps very robust mode. Which is a shame, since the most robust modes are necessary to have something that can compete with similar modes such as Pactor. While you can not legally use MIL-STD-188- 110A single tone modems in the MF/HF U.S. RTTY/Data portions of the bands, there does not seem to be any restriction in the phone/image portions. I have asked FCC for an interpretation of this but they simply will not respond. Yes, MARS has gone back to having CW nets. That was quite a reversal for them since they prohibited CW for a number of years. I did not realize that you can do keyboarding with RFSM. Maybe this is only possible with the newer RFSM8000 product? In fact that seemed like a significant limitation with RFSM2400. You could easily do ARQ file transfers, and the stations would constantly be testing back and forth, waiting for the next message but I did not see any way to get a keyboard type window open unless I completely missed it. The server feature is quite interesting, sounds similar to the PSKmail server, which is an ad hoc approach without the incredibly complications of Winlink 2000's system, however, you give up some of the convenience features. It sounds like you have considerable expertise with setting up such a system to e-mail access. At this time it is still a moot point for HF since you can not use for HF text messaging as mentioned above. Of course, it is completely legal to use on 6 meters and up which allows for much higher baud rates than the quasi 2400 baud rate of the MIL-STD-188- 110A modems. I wonder if this would have any possible use for providing localized connectivity for VHF? 73, Rick, KV9U
