[CQ-Contest] RDXC Log Checking

W0MU Mike Fatchett w0mu at w0mu.com
Fri Mar 13 08:39:26 PDT 2009

And everyone MUST have a computer.

I guess if your computer dies during the test you are done

But sure someone could do this. 

"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: cq-contest-bounces at contesting.com
[mailto:cq-contest-bounces at contesting.com] On Behalf Of Ed Steeble
Sent: Friday, March 13, 2009 8:23 AM
To: cq-contest
Cc: Ed K3IXD
Subject: Re: [CQ-Contest] RDXC Log Checking

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

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

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

If K3IXD receives a checksum that matches what his software expects, he
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 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

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