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MD2SAW > PACKET 03.08.21 11:00l 134 Lines 4770 Bytes #999 (0) @ WW
BID : 3587_MD2BBS
Read: GAST DQB562
Subj: Re: Direwolf FixBit DE/ENG
Path: DBO595<DBX320<MD2BBS
Sent: 210803/0927Z @:MD2BBS.#SAW.SAA.DEU.EU #:3587 [Salzwedel] $:3587_MD2BBS
From: MD2SAW@MD2BBS.#SAW.SAA.DEU.EU
To : PACKET@WW
Am 03.08.21 um 09:14 schrieb NL1VKL:
> Path: !VB1BOX!NL3VKL!
>
> From: NL1VKL@NL3VKL.NBO.NLD.EU
> To : PACKET@WW
>
> Message from: NL1VKL@NL3VKL
>
> Quoting from a previous message...
>
>>
>> From: MD2SAW@MD2BBS.#SAW.SAA.DEU.EU
>> To : PACKET@WW
>>
>>
>> English:
>>
>> hi and thanks for the information.
>>
>> You are of course right that FIX_BITS can not restore the packages to
>> 100%, but these "broken" packages are still forwarded to the respective
>> software, which can lead to problems in some cases.
>>
>> But you can let Direwolf check the packages after FIX_BITS, but this is
>> no guarantee for correct data.
>>
>> With
>> FIX_BITS 1 AX25
>> DW checks the AX25 address range for plausibility and with
>> FIX_BITS 1 APRS
>> DW checks if it is a plausible APRS packet.
>>
>> Concerning FX.25 and FIX_BITS, it looks like FIX_BITS is not used for
>> FX.25 packets.
>>
>> Normal packet without FX.25:
>> DNX527 audio level = 41(14/9) [NONE] _|||||___
>> the [NONE] indicates that FIX_BITS is enabled.
>> [NONE] - Don't try to repair.
>> [SINGLE] - Attempt to fix single bit error. (default)
>> [DOUBLE] - Also attempt to fix two adjacent bits.
>> [TRIPLE] - Also attempt to fix three adjacent bits.
>> [TWO_SEP] - Also attempt to fix two non-adjacent (separated) bits.
>>
>> FX25 package:
>> DX0SAW audio level = 54(15/10) 000007___
>>
>> Here are no FIX_BITS "labels" ( [....] ) given which leads me to believe
>> that no FIX_BITS is applied here.
>>
>> It depends of course on the area of application.
>> If I run a BBS that does forward via HF or if I use a NET/ROM link
>> FIX_BITS could be rather counterproductive.
>>
>> But I have no bad experiences with it so far although I also forward via
>> HF and also have a NET/ROM link via HF set up.
>>
>> I can only see that FIX_BITS "saves" packages from time to time.
>> In how far they were corrupted I can't say.
>>
>> Greetings,
>>
>> Translated with www.DeepL.com/Translator (free version)
>>
>> --
>> 73 Manuel.
>>
>
> Without forwarding / only simple user usage it isn't a big issue but can be
> very annoying. You're most likely seeing/noticing callsigns where a single
> character is something else than it should be. For example NL1VKL ->
> NL1VLL...
>
> The AX25 address range plausibility check is most likely to be optimized for
> HAM callsigns. Also with the given example it doesn't do anything good, the
> callsign is still wrong and will probably also fail with callsigns not
> following the plausibility check pattern, for example callsigns without a
> number in it. But that's an assumption with the experience of how several
> packet software packages do callsign validation/checks.
>
> My experience with FIX_BITS isn't that good, especially when forwarding.
> Yes... It saves packages, but corruption is likely and does occur. The
> higher FIX_BITS is set, the more occurances. Corrupted packets should be
> discarded, not trying to recover without FEC.
>
> Therefore I've disabled it again. I personally prefer a retry, it are only
> max. a couple of bits, or real/good correction (FEC) instead of corrupted
> frames.
>
> 73! Dave de NL1VKL
>
> ====================================================================
> _____ __ ___ _____ _____ __
> | | | | |_ | | | | | | | Sysop: Dave
> | | | | |__ _| |_| | | -| |__ QTH: Uden - JO21TP
> |_|___|_____|_____|\___/|__|__|_____| BBS: NL3VKL.NBO.NLD.EU
> QRV: 27.235 MHz (FM 1k2)
> 27.365 MHz (LSB 1k2)
> NL3VKL BBS
> NL5VKL Net/Rom node / internet gateway https://nl5vkl.mijndingen.nl
> ====================================================================
> ** This message is generated with Sally 7.2.044
> -----------------------------------------------------------------
>
Ok
Thank you for sharing your experience with FIX_BITS.
I keep an eye on my setup and settings.
--
73 Manuel.
=========================================================================
__ __ ____ ____ ____ ___ __
| \/ | _ \___ \/ ___| / \ \ / / Sysop: Manuel
| |\/| | | | |__) \___ \ / _ \ \ /\ / / QTH: Salzwedel - JO52NU
| | | | |_| / __/ ___) / ___ \ V V / BBS: MD2BBS.#SAW.SAA.DEU.EU
|_| |_|____/_____|____/_/ \_\_/\_/ QRV: 27.235 MHz / 27.025 MHz
PR-Mail: MD2SAW@MD2BBS.#SAW.SAA.DEU.EU
E-MAil: cb0saw@e-mail.de
Terminal: MD2SAW via CB0SAW
CB0SAW Teamspeak3-/I-Net-/HF-Gateway/I-Gate AXIP:185.180.196.36 U 18093
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