[RTTY] Multi Computer SO2R with N1MM

[Stein-Roar Brobakken]

thanks!!! :)


2013/2/23 Mark n2qt <n2qt at verizon.net>

> Basically you set up for Multi Op and then after the contest change the
> category before creating the cabrillo
> file.  (I'd make a backup first!)
>
> For best information take a look at
> http://n1mm.hamdocs.com/tiki-**index.php?page=Single+**
> Operator+Two+Radio+Operation+%**28SO2R%29#Two-Computer_SO2R<http://n1mm.hamdocs.com/tiki-index.php?page=Single+Operator+Two+Radio+Operation+%28SO2R%29#Two-Computer_SO2R>
>
> Mark n2qt
>
> -----Original Message----- From: Stein-Roar Brobakken
> Sent: Friday, February 22, 2013 8:13 PM
> To: Mark n2qt
> Cc: rtty at contesting.com
> Subject: Re: [RTTY] Multi Computer SO2R with N1MM
>
>
> to use N1MM in Multi computer SO2R , must you use SINGLE op or MULTI OP
> mode ????
>
> 73s LA6FJA Rag
>
>
> 2013/2/23 Mark n2qt <n2qt at verizon.net>
>
>  In W0YK's email on AA5AU's WPX notes in talking about using N1MM
>> for multicomputer SO2R he stated:
>>
>> "I found that the interlock is very slow and 2-3 characters overlap
>> transmission from both radios.  OTOH, no software interlocks can guarantee
>> the absence of two signals, if even for milli-seconds, so the operator is
>> responsible via a hardware interlock to not transmit simultaneously."
>>
>>
>> Since I had used this approach to operate SO#R I decided to measure
>> any possible overlap.  I would set one rig to cq and then interrupt it by
>> transmitting on the other rig.  I did this where one rig was controlled by
>> a networked computer and then with the more typical single computer
>> N1MM SO2R.  I used a storage scope to look at the rf output from the
>> rigs.
>>
>> For the networked computer configuration the the worst case was 566ms
>> of overlap with typical overlaps of over 400 ms.   As Ed stated this is
>> long
>> enough for several characters to be sent in violation of one signal at a
>> time.
>> Some other interlock is needed for rule compliance.
>>
>> However when using N1MM in its more typical single computer SO2R mode,
>> it is obvious the programmers worked to eliminate this overlap.  There
>> typically
>> was a 20 - 40 ms gap with NO RF emitted, between one rig's transmit signal
>> dropping and the second rig's transmit coming up.  After many sequences I
>> did
>> manage to get one series where there was just about 44ms of overlap.  This
>> is well less than one half character's worth of time.  I personally feel
>> good about
>> this performance.
>>
>> The computer used was a HEX Core AMD running WinXp.  I had multiple
>> receive
>> windows, packet,  along with two instances of CWSkimmer running.  I assume
>> for the rare instance of overlap, it was induced by a poorly timed
>> resource demand
>> from one of these other applications.   N1MM was set for last one wins for
>> SO2R
>> priority and 'stop other rig's transmit when this rig transmits' networked
>> priority.
>>
>> Mark n2qt
>>
>>
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