LF: RE: RE: WSPR Reports

[<victor13@online.nl>]

Hello Rik,Andy,

 

normally I use a 250 Hz USB filter for wspr,I get decodes down to -32 dB although rare...

 

73

 

Victor

-----Oorspronkelijk bericht-----
Van: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Rik Strobbe
Verzonden: woensdag 27 januari 2010 21:33
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: RE: WSPR Reports

Andy,

 

maybe the "magic" lies in a narrow filter (either IF or audio).

If I switch from a 2.5kHz (SSB) filter to a 270 Hz filter I also get a significant increase in SNR values reported by WSPR.

Unfortunaely it hardly affects the decoding level (minimal SNR needed to get a positive decode), that rises by almost the same amount.

 

73, Rik  ON7YD - OR7T

---

Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Andy Talbot [andy.g4jnt@googlemail.com]
Verzonden: woensdag 27 januari 2010 21:26
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: WSPR Reports

Has F6CNI managed some sort of magic noise reduction system, or is it a just a case of being in a very quiet location...

These are pretty impressive S/N values

 

 

2010-01-27 20:14	G4JNT	0.503875	+13	0	IO90iv	+23	0.200	F6CNI	JN19qb	391	243
2010-01-27 20:08	G4JNT	0.503875	+10	0	IO90iv	+23	0.200	F6CNI	JN19qb	391	243
2010-01-27 20:02	PA0A	0.503900	+15	0	JO33de	+37	5.012	F6CNI	JN19qb	502	312
2010-01-27 20:00	G4JNT	0.503875	+14	0	IO90iv	+23	0.200	F6CNI	JN19qb	391	243
2010-01-27 19:54	G7NKS	0.503920	-5	0	IO92ub	+20	0.100	F6CNI	JN19qb	422	262
2010-01-27 19:54	G4JNT	0.503875	+14	0	IO90iv	+23	0.200	F6CNI	JN19qb	391	243
2010-01-27 19:44	G4JNT	0.503875	+10	0	IO90iv	+23	0.200	F6CNI	JN19qb	391	243
2010-01-27 19:40	PA0A	0.503900	+15	0	JO33de	+37	5.012	F6CNI	JN19qb	502	312

 

Andy
www.g4jnt.com