|To:||RSGB <[email protected]>|
|Subject:||LF: Narrow B/W Techniques|
|From:||Lawrence Mayhead G3AQC <[email protected]>|
|Date:||Tue, 5 Jul 2005 16:01:28 +0200 (CEST)|
|Delivery-date:||Tue, 05 Jul 2005 15:02:27 +0100|
This is an appeal to the writers of QRSS/Argo?Spectran software, and also to those much more expert than I am to comment.
Is it time we looked at method of time synchronisation? in order to improve sig/noise ratio in very slow morse transmissions. ie QRSS.
As I understand it about 3db improvement is possible by making the FFT sample time equal to the dot length.
If we are using QRSS10 for example a time accuracy of 1 sec. is only 10% and at QRSS30 this is only a 3% error. I should not have thought it too difficult to get this fromGPS or even MSF-60 or DCF 77 time clocks, nor should it be too expensive.
My big question is however how do I :- 1) Synchronise my QRSS/DFCW programs and 2) my Spectran/ARGO programs to the computer clock. Does this facility exist and if not would it be very difficult to implement?
If these options were available perhaps more people would consider locking their computer clocks, so perhaps we could win another 3db.
Whatever you Wanadoo
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