[RTTY] About N4II's experiment...

[David G3YYD]

All very interesting but if you really want to measure this stuff then you
need to talk to Peter Martinez, G3PLX he has been doing it for years.

The best way is to use a chirp signal that is within the normal SSB
bandwidth. Using this one can separate out the different path times as well.
By using GPS time sync at the TX end and the RX end it is possible to very
accurately measure the path(s) delay time between the two. This can only be
done after calibrating for the equipment delay times.

By integrating the signal over a longish period of time then the power
required can be very low yet still give  very accurate measurements. It is
even possible to measure multi-hop backscatter reflections useful for
propagation measurement.

If you want to do it over a very wide bandwidth then there are plenty of
chirp sounders around that can be used. They start at a low frequency then
scan higher normally at a GPS accurate 100KHz per second. By locking a
receiver onto the scan rate and start time of the chirp sounder it is
possible to use them as a ionospheric bi-static RADAR. The beauty of using
this method is no transmitter is required as it already exists for free. So
no need to bother the FCC...

However like I said G3PLX is the guy to talk to on this.

73 David G3YYD

-----Original Message-----
From: RTTY [mailto:rtty-bounces at contesting.com] On Behalf Of Joe Subich,
W4TV
Sent: 15 March 2014 01:31
To: rtty at contesting.com
Subject: Re: [RTTY] About N4II's experiment...


 > No baloney! I urged and helped Ed write that FCC comment.

Congratulations - we can now measure the value of your comments in terms of
real, observable, physical phenomena ... just like your all knobs/sliders to
the max AFSK.

73,

    ... Joe, W4TV


On 3/14/2014 8:54 PM, Kai wrote:
> Andy,
> No baloney! I urged and helped Ed write that FCC comment. The proposed 
> experiment is real..
> If you want to discuss this, we should take it off the reflector.
> 73
> Kai, KE4PT
>
> On 3/14/2014 6:29 PM, aflowers at frontiernet.net wrote:
>> (Honestly Kai, your baloney detector should have gone off instantly 
>> in even a cursory reading.  You did read it, didn't you?)
>>
>> I decided not to reference this in my reply comments since these 
>> comments may have been done in ignorance (I have no idea who N4II 
>> is), but since Kai wants to hold it up as an example we ought to at 
>> least look closely.
>>
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