[RTTY] About N4II's experiment...

[Phil Sussman]

Poor Joe,

Aren't you aware these items are no longer of concern. All of the
newest products are NGDS .. next generation defined software. Forget to
decouple the USB power -- no problem. The latest software version will
switch in a proper 'software generated' components.

Oh yeah, no need to adjust anything. The software will properly detect
any connections and settings for any rig. You don't even have to call
CQ - NGDS will do that, make contacts, create an ADIF log and submit
it for you. No silly operator intervention is necessary.

<grin>

PS. Of course the software can also generate a winning certificate.
Now if it could only frame and hang it ???

73 de Phil - N8PS



Quoting "Joe Subich, W4TV" <lists at subich.com>:

>
>> It's not like simple AFSK, where you just need to follow the
>> manufacturer's instructions.
>
> Only follow the manufacturers instructions if the manufacturer knows
> how to give valid instructions - unlike some PhDs who think they can
> increase the speed of light by almost 50% at will.
>
> Manufacturers who skip the chipmaker's recommended regulator for the
> sound ADC, who fail to properly decouple (filter) the USB power, who
> fail to regulate the V/2 reference for their op-amps and who fail to
> adequately decouple their power distribution bus certainly can't be
> trusted to know what they're doing when it comes to instructions
> about setting AFSK levels.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 3/15/2014 7:30 AM, Kai wrote:
>> You're quite right Chen. At the risk of annoy the moderator with
>> off-topic discussions, time-of-flight is not all that needs to be
>> measured, but it is necessary to a certain precision. The probe signal
>> is quite a bit more sophisticated. The signal bends in three dimensions,
>> separates into counter rotating waves of circular polarization that
>> travel different paths and at different propagation velocities, possibly
>> reflects and diffracts from  the gray line region and Auroral oval
>> boundaries. It is subjected to multipath and ISI, and so on. It's a
>> digital signal designer's heaven (and a propagation weenie's heaven)!
>> Competing theories predict different paths, as well as different
>> multipath, and differing propagation velocities. The ionosphere is
>> complex, and then you add the Earth magnetic field, and things get
>> really interesting in a hurry (think CRT). It's not like simple AFSK,
>> where you just need to follow the manufacturer's instructions.
>>
>> 73,
>> Kai, KE4PT
>>
>>
>>
>> On 3/15/2014 12:23 AM, Kok Chen wrote:
>>> On Mar 14, 2014, at 8:49 PM, Kai wrote:
>>>
>>>> We do however want to measure the propagation speed of signals in the
>>>> ionosphere...
>>> There are more unknowns than measurables, Kai, if all you are
>>> measuring is the path transit time.  The problem is not the "baud
>>> rate" (we know for example that it is easy to measure transit time to
>>> much more precise than T, using a pulse whose width is T).
>>>
>>> Think of a similar experiment where you use total internal reflection
>>> of a prism in a reflex light path to measure the speed of a laser
>>> beam.  You don't know the size of the prism, nor the distance of the
>>> laser to the prism, and you don't know the refractive index of the
>>> glass used to construct the prism.  All you can do is to measure the
>>> transit time as precisely as possible.  With that alone, you cannot
>>> determine the refractive index of the prism.
>>>
>>> Now imagine the prism to be a simple model of the ionosphere.  (In the
>>> case of the ionosphere, the density is not even constant.)
>>>
>>> 73
>>> Chen, W7AY
>>>
>>>
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