Hello Andy, Tony and all,
I confirm. It is considered that normally one retry or two is (are) sufficient
(it is equivalent to have a gain of respectively + 3 or +6 dB in S/N thanks to
the Memory ARQ). So a third retry is considered as not normal (either the
timing is lost or there is a shift between RX and TX frequencies) and, in that
case, a RS ID is transmitted to force the time and frequency resynchronization
(the other Ham will decode any RS ID in a 400 Hz bandwidth around his central
frequency, but I'm not sure 400 Hz is not to much, to see...).
In the test version, in ARQ FAE connected mode, the way to transmit RS ID or to
decode RS ID is done automatically. So it is necessary to connect a Ham with
the same test version (12/09/2009). With an "old" version receiving a RS ID for
nothing, the resynchronization will be, reversely, a bit more difficult.
Last Multipsk test version: http://f6cte.free.fr/MULTIPSK_TEST_12_09_2009.ZIP
Paste this adress in your Internet Explorer or equivalent. Download the file.
Create a tempory folder (C:\TEST, for example), unzip the file in it and start
C:\TEST\Multipsk.exe (the auxiliary files will be created automatically).
Note: there is a button "4285" in "Professional mode: no 4285 decoding must be
expected, so no try it (it's a test version).
73
Patrick
- Original Message -
From: Tony
To: digitalradio@yahoogroups.com
Sent: Sunday, September 13, 2009 2:48 AM
Subject: Re: [digitalradio] QRV ALE-400 14074.0 - SKEDS PSE!
Andy,
Just finished QSO with KC8TZJ on ALE-400. I forced the mode to resync a few
times and the new version does exactly what Patrick said it would; it sends an
RSID / resync burst after 3 retries and restores the timing.
John, KC8TZJ was running an old version of Multipsk without this feature, but
I guess that wouldn't matter.
Tony -K2MO
- Original Message -
From: "Andrew O'Brien"
To:
Sent: Saturday, September 12, 2009 7:54 PM
Subject: Re: [digitalradio] QRV ALE-400 14074.0 - SKEDS PSE!
> ALso QRV 14074, new version.
>
> On 9/12/09, Tony wrote:
>>
>>
>>
>> All,
>>
>> Patrick released a new ALE-400 test version that uses RSID to resynchronize
>> after a certain number (3) of retries. This feature should work well to
>> correct out-of-sync problems that happen on occasion when signals are weak.
>>
>> I worked W2KI/M from his motor home in Colorado today and it seems there
>> may be a bug; I'd appreciate a sked tonight on 20 meters (14074.0) so we
can
>> let Patrick know if the latest release is working ok.
>>
>> I'm QRV as of 2345z on 14074.0 USB. I'll be there all evening.
>>
>> Tony -K2MO
>>
>>
>>
>>
>>
>>
>>
>
>
>
> --
> Andy
>
