Just downloaded JASON, but my
machine does not seem to be able to handle it...
It is Pentium II running at 366 mHz
Celeron CPU with 128 megs of RAM
Any ideas ?
After going trough the conceptual approach or Señor Alberto 's JASON
program, I want to congratulate him for such a wonderfully well thought
approach to weak signal work !!!
As a VHF enthusiast I foresee very interesting applications for JASON in
that area too ...
73 and DX
Arnie Coro
CO2KK
Host of Dxers Unlimited
Radio Havana Cuba's radio hobby program
----- Original Message -----
From: "Alberto di Bene" <[email protected]>
To: <[email protected]>
Sent: miércoles, 16 de enero de 2002 9:30
Subject: LF: Re: G3YXM's Jason test sigs
James Moritz wrote:
> If the centre frequency is
> F, and the spacing between tones is f, the possible tone frequencies are
F
> +/- (n-0.5)*f where n is an integer from 1...16. Therefore there are 32
> possible equally-spaced tone frequencies from F-15.5f to F+15.5f. Is
this
> correct?
>
Hi Jim and the group,
yes, correct, that's how the information is encoded in Jason.
There is another possible format, which has pros and cons.
It has been also suggested by Stewart Nelson. I had initially,
when designing Jason, dismissed it, but now I am here asking
your collective opinion.
Presently only the absolute value of the frequency delta is used
to encode the information. If I use also the sign, I have this results :
-Pros The band occupied is nearly halved, from 32 slots, it goes
down to 17 slots.
-Cons The system is no more sideband independent. Now it is
immaterial whether the RX is set to LSB or USB.
This would not be any more the case with the alternate scheme.
So, what would all you judge more important, sideband independence,
or bandwidth used ? Your vote will decide the final format for Jason.
73 Alberto I2PHD
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