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LF: Re: QRSS question

To: [email protected]
Subject: LF: Re: QRSS question
From: "Alberto di Bene" <[email protected]>
Date: Fri, 29 Dec 2000 02:21:57 +0100
Organization: Undisclosed
References: <000c01c070df$f218bfa0$0c8d01d4@g4jnt>
Reply-to: [email protected]
Sender: <[email protected]>
Andrew Talbot wrote:

How about letting it go slow enough for a 30s dot  or a resolution bandwidth
of 0.01Hz - as far as I know the only soundcard software that could get
anywhere near this and do proper SLOWCW was Spectran.

None of this fast 3s dot stuff !    My 56002 EVM system can get down to 1
hour dot intervals, looking in a bandwidth of 100 uHz (micro Hz).   That
would span the Altantic with 1mW ERP if present records are anything to go
by.   Pitgy it would take several days for a proper QSO !!!!!!!   :-(

Andy  G4JNT


Andy,
           thanks for the suggestion, which I have implemented this evening.
Summing up, at present the supported modes are :
- Full Band View, a span of 1.5 kHz
-   3 sec/dot, the screen is refreshed 5 times per second, with 0.34 Hz 
resolution.
- 10 sec/dot, the screen is refreshed 2 times per second, with 0.08 Hz 
resolution.
- 30 sec/dot, the screen is refreshed every 1.5 seconds,  with 0.021 Hz 
resolution.

About your micro Hz resolution, it can be done also with a PC, the fastest
Pentiums nowadays process a FFT butterfly in a shorter time than the 56002 DSP.
But, as you rightly pointed out, the problem lies in that reciprocal 
relationship between
F and T .....

73
Alberto   I2PHD




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