Sam
I appreciate and understand what you are saying; by the way, well done, I
like your style. But, wrt propagation, if you have 2 transmitters in the
same town, one of whom is known to be a goody wearing a white hat and one of
whom is being closely monitored, you can calculate and estimate and analyse
and come to a reasonable conclusion which is statistically significant.
Over a period, a data base of white hats v grey hats can point a finger of
suspicion. With this on the web for all to see, it might be enough in
itself: you never know the power of peer pressure or adjudicators asking
searching questions. It is a tool that has just popped up very recently,
who knows where it might lead.
David
G3UNA
>I wonder how you would account for propagation. The ionosphere is pretty
> nebulous and it is normal for ebb and flow of 10db during a single
> transmission. When it is not in that state, and there is still
> propagation,
> it may act more like a mirror. When it is like that eg 10 meters at cycle
> peak, a 5 watt mobile may be a candidate for running 30kw. Adding 10db
> (Going to 15kw) may not be identifiable by just listening at several sites
> unless you had a control transmitter at 1.5kw and an antenna system like
> your target. I had a 50' boom 20m yagi at 100' and would routinely beat
> the
> 6L tribander a few miles away with him running full tilt 1.5kw and I
> thought
> it was fun to run 50 watts and beat him to it. My antenna was nothing
> compared to some of the big guns but it illustrates that power is not
> always
> the answer unless all other things are equal and they usually are not.
>
>
> I saw a demonstration at the RSGB HF Convention: lots of SDR receivers
> around the world are scanning the whole spectrum or parts of it giving
> relative signal strength readings and id for each station. As I saw it,
> although the strength readings were relative and not calibrated, several
> within the same area would be on similar bearing and sky wave angle and,
> knowing each of the stations, a data base can be constructed from which
> you
> could determine that wildly large signals compared to all the neighbours
> would indicate a statistical significance regarding their output power.
> The
>
> larger the number of these receiving stations there are (and they are
> growing) and the more that border the obvious transgressors, the more
> likely
>
> you are to catch them red-handed. It only takes a few to produce
> reasonably
>
> calibrated data to make it a powerful tool.
>
> David
> G3UNA
>
>
>
>
>
>>I dont see how unless the station is within walking distance. Propagation
>>can vary huge amounts in a very short distance.
>>
>> Carl
>> KM1H
>>
>>
>>>
>>
>>> The wider use of reverse beacons will accumulate enough statistical data
>>> on
>>> transgressors to dissuade them or disqualify them, there for all to see.
>>>
>>> David
>>> G3UNA
>>>
>
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