Hey Everybody,
I see that this references N1MM but I wonder if anyone has don't the
same analysis for Writelog?
Guess I will show my ignorance here.
But what is a reasonable (priced) hardware solution?
Jim/KC4HW
On 23 Feb 2013 at 7:55, Jay WS7I wrote:
> If there is "any single time that their is 2 transmitted signals you are
> in violation and are not a Single Operator. All SO#R operators need to
> run a hardware device to preclude this situation. This is nothing new
> at all. Just the over looking by the group that it isn't a problem. It
> is quite easy to put a system in place and to find stations that are
> running on two bands at once. 44 Ms of overlap means 2 signals and this
> means you are illegal.
>
> Also it depends a great deal what you are using for PTT and also what
> radios are interfaced and which modem you have selected to use.
>
> If the 20-40Ms gap is right then it needs to be controlled and at least
> 100Ms it sounds like from this study. But again. it should be absolute
> hardware control and not a software situation.
>
> 2-Signals EVER is illegal.
>
> On 2/22/2013 5:04 PM, Mark n2qt wrote:
> > 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.
>
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