Hi,
You can set the data rate and you can use 300 bps if you wish. Also, its not
actually 2400 baud but rather 2400 bps. If I remember this right then a user
data rate of 1200 bps would require a channel rate of 2400 bps. That channel
rate is then sent at 1200 bauds using 4-psk (two bits per state change).
But yes, if I remember the standard right then the actual baud rate is always
more than 1200 bauds. 75 bps is a special case using a channel rate of 150 bps
but it uses a really long word for each bit and the resulting baud rate is
still too high (but legal here in europe).
73 de Per, sm0rwo
----- Original Message ----
From: Rick <[EMAIL PROTECTED]>
To: digitalradio@yahoogroups.com
Sent: Thursday, October 4, 2007 3:36:08 PM
Subject: Re: [digitalradio] RFSM8000
John,
If this modulation is the MIL-STD/FED- STD/STANAG 8PSK waveforms,
wouldn't they be at 2400 baud at all times? We can not use baud rates
over 300 here in the U.S. on the text digital portions of the bands, but
they could possibly be used in the voice/image portions for sending
images/fax.
Possibly packets could be received as long as you are not linked and the
program can send unconnected packets?
What will be extremely helpful is for any experiences you have with data
throughput vs S/N and interference.
It is still curious to me that the promoters of "ALE" modes do not test
these protocols in the voice portions of the bands. Also on 6 meters and
up. There has been absolutely no measurements of S/N in real world tests
on the amateur frequencies that we have heard thus far.
73,
Rick, KV9U
John Bradley wrote:
>
> Tnx fer the note, Howard
>
>
>
> Over the next week or so ,we should have VE5GPM up and running 24/7 on
> RFSM 8000, not beaconing, but ready to receive calls and transfer files.
>
>
>
> VE5TLW and I will be working on learning the software and making a
> little noise with same. I think we will find an alternate frequency to
> play on since
>
> 14109.5 is busy with ALE soundings ,and will let you know what it is.
>
>
>
> To that end would welcome input from the US ham community since this
> is a more critical issue south of the border than here.
>
>
>
> I THINK that you are able to use the non-standard modulation which is
> 2.4khz wide , as opposed to the Mil Std 188 which is 3khz wide. You
> should be able to copy any packets in the Packet window.
>
>
>
> Again , get some opinions from others in the US as to whether this is
> legal , and where in the US band plan it could be used. At first
> blush , it certainly has some promise.
>
>
>
> John
>
> VE5MU
>
>
>
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