[CQ-Contest] RDXC Log Checking

[Igor Sokolov]

This has already been suggested by KY1V two days ago in this reflector. This 
will not work.
1) there are still people that contest without computer.
2) If the checksum algorithm is public, nothing prevents one from 
calculating the check sum based on what one thinks one received and putting 
it into the log.
In fact the checksum can be substituted by sending and logging the call sign 
and serial number twice. Still adjudicators will not be able to determine 
100% whose fault is this in case of difference in logs information.
3) What we really need is the type of exchange that allow adjudicators 
determine who made a mistake by merely checking logs. Now could someone who 
knows the theory of information relay tell if such an exchange is possible 
at all?

73,
Igor UA9CDC

>
> After reading all the back and forth comments generated by K5ZD about
> the RDXC log checking I think that we need a new contest which has a
> new exchange or a contest with a modified exchange. Namely, a contest
> with a software generated checksum to be sent back in acknowledgment of
> the exchange. The checksum insures accuracy.
>
> I propose that the software programs be revised to compute a simple
> check sum from a public algorithm. The check sum would be computed from
> the sender's QSOs date (YYYY/MM/DD - Zulu date), time (in hhmm - Zulu
> time), band (in meters), call sign worked, and exchange sent (maybe RST
> and serial number).
>
> For example, a contest that requires RST and serial number.
>
> K3IXD calls CQ.
>
> K5ZD answers him.
>
> K3IXD sends on 20m at 2009/03/12 1359z:
> K5ZD 599 025 K3IXD (and K3IXD software computes a checksum based on what
> he sent).
>
> In reply K5ZD sends on 20m at 2009/03/12, 1400z:
> K3IXD 599 060 ab45 K5ZD (his software has computed a checksum on what he
> copied. Also the software computed a checksum based on what K3IXD sent.
> That will be compared to what K5ZD receives from K3IXD in the following
> exchange).
>
> If K3IXD receives a checksum that matches what his software expects, he
> replies:
> K5ZD fj98 K3IXD (the checksum computed from what K3IXD copied)
> else K3IXD retransmit his original exchange, but not with a new QSO
> date/time.
>
> If that matches what K5ZD software expects, K5ZD replies:
> K3IXD TU K5ZD
>
> K3IXD calls CQ
>
> This would be a good contest for improving coping of call signs and
> exchanges. The negative is the contester couldn't log the casual
> operator who dropped by to hand out a QSO, to work DX, or maybe states
> for Triple Play award. However, there could be a special (null) check
> sum value for those situations.
>
> The WAE already has contesters sending QSO information back but to
> another station. All :-) it would take is for some sponsor to require a
> checksum exchange and one or more software developers to implement it.
>
> 73, Ed
> K3IXD
>
>
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