Hello Tony,
What are the numbers that you get?
In fact, from my measures, the first decodings appear at -19 dB in RS ID and
-16 dB in Call ID (but respectively -16 and -13 dB for almost 100 % success).
>SNR tests
I think it must be a bit difficult to measure S/N for bursts. What I do, on my
side, in to mix signal and noise (just noise without paths delays...) at
digital level before the analogical transform and then I see at what level I
can decode.
73
Patrick
----- Original Message -----
From: Tony
To: digitalradio@yahoogroups.com
Sent: Friday, October 30, 2009 2:09 AM
Subject: Re: [digitalradio] Message ID in multipsk
Patrick,
Thanks for adding the messaging feature. Andy, K3UK, and I were able to copy
Sholto's, RS messages some 3700km away on 20 meters. Sholto, K7TMG, was running
5 watts and a vertical antenna. We found the high sensitivity of the message
mode useful as signals fell below the decode threshold of the chat modes we
were using at the time.
> The RS ID is detectable at -16 dB but the Call ID only at about -13 dB
(however still better
> than PSK31).
Very sensitive, more than most sound card chat-modes. I'm not sure why
Patrick, but my SNR tests indicate that the RSID used for mode detection has a
6db advantage over the CALL ID. I ran both modes through the path simulator 10
times each and established a minimum SNR when they decoded 10 out-of 10 times
or 100%.
I'll check all levels and try again.
Thanks Patrick.
Tony -K2MO
----- Original Message -----
From: "Patrick Lindecker" <f6...@free.fr>
To: <digitalradio@yahoogroups.com>
Sent: Thursday, October 29, 2009 4:38 PM
Subject: Re: [digitalradio] Message ID in multipsk
> Hello Tony,
>
> The Call ID that I just have slightly modified is based on a specific RS ID
code (it was the most simple, but it is not a mode ID, just a borrowing) on
which is implemented a more conventional frame (56 bits + CRC). The RS ID is
detectable at -16 dB but the Call ID only at about -13 dB (however still better
than PSK31).
>
> 73
> Patrick
>
> ----- Original Message -----
> From: Tony
> To: digitalradio@yahoogroups.com
> Sent: Thursday, October 29, 2009 7:52 PM
> Subject: Re: [digitalradio] Message ID in multipsk
>
>
>
>
>
> Steinar,
>
> > I am testing the " Message ID" in Patrick's latest beta of the
> > MULTIPSK (VERSION 4.16 of 27/10/2009) on 14.074.
>
> I haven't had the opportunity to use the message ID on-the-air, but I did
test the mode between two PC's and it seems to work fine.
>
> I would assume the Reed Solomon messaging will be just as sensitive and
robust as RS ID; should work well. Hope to see you on the air Steinar...
>
> Tony -K2MO
>
>
>
>
>
>
