[Dx4win] Prefixes/Zones for Spotters bug?

[F6EXV]

Hi Frank
One way to limit spots coming from Europe is to type the command :
set/nodxdedx on your cluster. (To get it back, type set/dxdedx)
You will get only spots originating from Europe. But this is a cluster 
command, not a DX4Win command.
73
Paul F6EXV

Frank R. Oppedijk wrote:

>
> Hi,
>
> I'm using DX4WIN 7.05.04 and I'm trying to get filtering on prefixes 
> to work. Either I totally misunderstand the way the "Prefixes/Zones 
> for Spotters" field works, or have discovered a bug.
>
> When I enter OK into the "Prefixes/Zones for Spotters" field, I would 
> except to receive only spots from spotters in the Czech Republic. 
> However, I get spots from both Czech and US spotters. It looks as if 
> DX4WIN interprets the OK as any spots from spotters OK as well as 
> spots from spotters from substrings from OK (except the first 
> substring - see further!)!
>
> I did a bit more experimenting (spots from I, K, DL, VK, PA, UA, EA 
> were available at the DX-cluster at that time):
>
> specified filter prefix spotters displayed from
> OK                      OK, K
> OI                      I
> KI                      I
> IK                      K
> ODL                     DL
> OD                      none (there weren't any OD spots present)
> VK                      VK and K
> DLVK                    VK and K
> PAVK                    VK and K
> VKPA                    PA
>
> So it looks like DX4WIN does the following:
>
> 1. It chops the specified filter prefix into chunks (eg. the prefix VK 
> is split into V and K)
> 2. It checks which chunks are valid prefixes (V isn't a valid prefix 
> but K is)
> 3. It matches the spotters against the whole specified filter prefix 
> (VK) and all chunks EXCEPT THE FIRST ONE (in this example, only the K 
> chunck is checked)
>
> The fact that the first chunk is discarded is not visible from the VK 
> example, but is visible from the KI example (K spotters were 
> discarded), and similarly from the IK example (I spotters were 
> discarded), and also from the DLVK, PAVK and VKPA examples.
>
> Now, have I killed too many brain cells in last weekend's party, or 
> have I discovered quite an intricate pattern-matching bug?
>
> As you may understand, the current behavior is undesired for me, as I 
> don't have much use for spots from stateside spotters, still get them 
> all when specifying a filter containing a K, such as OK...
>
> 73,
>
> Frank PA4N
>
>
>
> _______________________________________________
> Dx4win mailing list
> Dx4win at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/dx4win
>
>
>