[CQ-Contest] CQWW 10 minutes M/S rule

David Wilburn dave.wilburn at verizon.net
Wed Oct 29 13:45:30 EDT 2008

I'm new to contesting, can someone help me understand the point of a 
10 minute rule?  I don't quite see why it makes a difference if a 
station that has multiple operators, but only one transmitter can only 
switch bands at certain times.

Because of the second rule, it is implied that they are actually using 
two transmitters, but only one can transmit at a time.  But it seems 
like the second rule says the two transmitters each have their own timers.

Ok, I'm just getting more confused.  I am trying to understand how the 
pieces fit together.  My wife and middle son are Techs, and I wanted 
to do a M/S at some point.  Just trying to understand the point of the 

David Wilburn

kr2q at optimum.net wrote:
> The CQWW DX Rule:
> Single Transmitter (MS): Only one transmitter and one band permitted during
> any 10-minute period.
> Exception: One—and only one—other band may be used during any 10-minute period if—and
> only if—the station worked is a new multiplier. Ten-minute periods are defined as starting with
> the first logged QSO on a band.
> So if - "1st QSO on 160m logged at 03.12," you count how many minutes you must be on 
> the band:
> 0312 = 1
> 0313 = 2
> 0314 = 3
> 0315 = 4
> 0316 = 5
> 0317 = 6
> 0318 = 7
> 0319 = 8
> 0320 = 9
> 0321 = 10
> You may initiate a "new band" QSO after the 10 minute duration.  Your "required" time 
> on 160  (in your example) ends when minute 0321 is completed.  Therefore, you may 
> QSY to another band an initiate another QSO starting at 0322.  Then you have stay 
> on that "new" band for a DURATION of at least 10 minutes.
> PLEASE NOTE that the clock STARTS with the FIRST QSO.  So if you QSY'ed at 0322, but did
> not make a QSO until 0325, then you must STAY on the "new" band through and including
> minute 0334.  In this example, your next "different band" QSO cannot start until 0335.
> Finally, please note that there are two separate 10 minute rules: one for the runner and one
> for the multiplier station.  And, of course, you may stay on the band (runner or multiplier or both)
> for MORE than 10 minutes duration if you want to.
> Hope this helps,
> de Doug KR2Q
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