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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+CW\s+S\/N\s+abilities\s*$/: 5 ]

Total 5 documents matching your query.

1. Re: LF: CW S/N abilities (score: 1)
Author: "Roelof Bakker" <[email protected]>
Date: Mon, 11 Jan 2010 19:16:50 +0100
Hello Andy, The bandwidth of the SPM-30 was set to 24 Hz. 73, Roelof
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-01/msg00198.html (8,795 bytes)

2. LF: CW S/N abilities (score: 1)
Author: Andy Talbot <[email protected]>
Date: Sun, 10 Jan 2010 23:18:43 +0000
A serious appeal to all the CW and QRS(S) ops on this reflector.     I'm interested in what can really be achieved in terms of readability of weak CW .  For the calculations mentioned earlier I made
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-01/msg00241.html (11,420 bytes)

3. Re: LF: CW S/N abilities (score: 1)
Author: "Roelof Bakker" <[email protected]>
Date: Mon, 11 Jan 2010 19:05:34 +0100
Hello Andy, This is an interesting question. The last few years I have increased the readibility of very weak non directional beacons by decreasing the filter bandwidth. The results have been quite s
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-01/msg00263.html (10,640 bytes)

4. Re: LF: CW S/N abilities (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 11 Jan 2010 18:41:38 +0000
Good.... Confirms exactly what I assumed.   5dB in 24Hz (which is about the same effective bandwidth of a good pair of ears)  is -15dB S/N in 2500Hz   Its interesting, too, that SSB is readable at fa
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-01/msg00821.html (11,578 bytes)

5. Re: LF: CW S/N abilities (score: 1)
Author: Andy Talbot <[email protected]>
Date: Mon, 11 Jan 2010 18:10:28 +0000
/rsgb_lf_group-archives/html/rsgb_lf_group/2010-01/msg00846.html (10,309 bytes)


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