Hello Jim,
over the past weeks I completed my new rig, that can be used to transmit on 501 and 472 kHz (we still have the 501-504 kHz segment available in Belgium).
In theory the radiation resistance of a short vertical antenna increases with the square of the frequency, so going from 501 kHz to 472 kHz will make Rrad drop by 11% (= 0.5dB).
Further I noticed that the loss resistance increased from 71 Ohm (on 501 kHz) to 76 Ohm (on 472 kHz) = +7% (=-0.3dB).
So overall the efficiency will drop by about 0.8 dB (or I will need 20% more power to get the same ERP).
73, Rik ON7YD - OR7T
PS: QRM level (energy saving lamps, switched PSU's etc...) is most of the time lower on 472 kHz compared to 501 kHz
Hi All, while I’m not renowned for having the most efficient or qro MF station, I have noticed that 472 is not as good for range, for
me at least, as 500 was. I used to be able to be spotted by Finbar, John PG, Lubos etc but these days, XIZ represents real dx!!
Even after rejigging antenna etc its still not brilliant.
Cheers all
Jim G7NKS
090325 0050 9 -21 1.5 0.503938 G0NBD IO83 13
You still had 10 DBs to spare for a decode!!! Try 2 milliwatts...
Looks like 155,700 miles per watt...
Good on ya... PSE QSL VIA E-MAIL... ( hi hi )
Sent:
Sunday, October 06, 2013 1:08 AM
Subject:
Re: LF: MF WSPR, crazy
Im sure the band was in better shape in those days ?
|
2009-03-25 00:56
|
G0NBD
|
0.503938
|
-23
|
0
|
IO83lk
|
+13
|
0.020
|
AA1A
|
FN42pb
|
5012
|
3114
|
|
2009-03-25 00:56
|
G0NBD
|
0.503937
|
-23
|
0
|
IO83lk
|
+13
|
0.020
|
DJ6YD
|
JO42bg
|
760
|
472
|
Sent:
Friday, October 04, 2013 11:53 PM
Subject:
LF: MF WSPR, crazy
Actually no need to inform about it, because everyone seems to be QRV now :-)
Anyway, the hell is going on on MF WSPR!
Got decodes by 71 stations in the last 2 weeks and 47 in the last 24 hours. Need to post that here, i'm impressed.
Tnx to all.
73, GL, Stefan/DK7FC
71 spots:
|
Timestamp
|
Call
|
MHz
|
SNR
|
Drift
|
Grid
|
Pwr
|
Reporter
|
RGrid
|
km
|
az
|
|
2013-10-03 00:00
|
DK7FC
|
0.475685
|
-28
|
0
|
JN49ik
|
1
|
RX3DHR
|
KO94ks
|
2125
|
62
|
|
2013-10-04 22:42
|
DK7FC
|
0.475686
|
-15
|
0
|
JN49ik
|
1
|
OH6JKN
|
KP22xk
|
1789
|
30
|
|
2013-10-02 18:24
|
DK7FC
|
0.475686
|
-26
|
0
|
JN49ik
|
1
|
LB9YE
|
JP54pu
|
1721
|
4
|
|
2013-10-04 01:12
|
DK7FC
|
0.475687
|
-26
|
0
|
JN49ik
|
1
|
SV8RV
|
KM07ks
|
1621
|
139
|
|
2013-10-04 03:30
|
DK7FC
|
0.475688
|
-27
|
0
|
JN49ik
|
1
|
EA1FBU
|
IN52qg
|
1556
|
246
|
|
2013-10-02 04:00
|
DK7FC
|
0.475687
|
-2
|
0
|
JN49ik
|
1
|
ES5AM
|
KO38gr
|
1547
|
41
|
|
2013-10-02 03:18
|
DK7FC
|
0.475686
|
-16
|
0
|
JN49ik
|
1
|
EA5DOM
|
IM98wn
|
1398
|
213
|
|
2013-10-04 02:36
|
DK7FC
|
0.475688
|
-6
|
0
|
JN49ik
|
1
|
SM0FGT
|
JO89xg
|
1244
|
25
|
|
2013-10-04 02:00
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
IZ7PDX
|
JN80ps
|
1174
|
142
|
|
2013-10-02 03:06
|
DK7FC
|
0.475687
|
-13
|
0
|
JN49ik
|
1
|
IZ7SLZ
|
JN80nu
|
1159
|
142
|
|
2013-09-29 00:00
|
DK7FC
|
0.475688
|
-27
|
0
|
JN49ik
|
1
|
EA2HB
|
IN93ah
|
1063
|
234
|
|
2013-10-04 21:48
|
DK7FC
|
0.503891
|
-18
|
0
|
JN49ik
|
1
|
G4VQP
|
IO70je
|
1001
|
280
|
|
2013-10-04 22:36
|
DK7FC
|
0.475685
|
-10
|
0
|
JN49ik
|
1
|
G3XKR
|
IO70ux
|
940
|
285
|
|
2013-10-02 20:48
|
DK7FC
|
0.475685
|
-10
|
0
|
JN49ik
|
1
|
G0MJI
|
IO83ni
|
913
|
303
|
|
2013-10-02 03:18
|
DK7FC
|
0.475685
|
-28
|
0
|
JN49ik
|
1
|
SQ2BXI
|
JO94gj
|
870
|
47
|
|
2013-10-04 02:24
|
DK7FC
|
0.475670
|
+2
|
0
|
JN49ik
|
1
|
M0EMM
|
IO82sq
|
859
|
299
|
|
2013-10-04 13:30
|
DK7FC
|
0.475685
|
-28
|
0
|
JN49ik
|
1
|
G0HNW
|
IO93cn
|
858
|
306
|
|
2013-10-02 03:18
|
DK7FC
|
0.475685
|
-2
|
0
|
JN49ik
|
1
|
G8HUH
|
IO81mg
|
851
|
288
|
|
2013-10-03 00:42
|
DK7FC
|
0.475687
|
-4
|
0
|
JN49ik
|
1
|
G8HUH/2
|
IO81mg
|
851
|
288
|
|
2013-10-02 22:12
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
M0PPP
|
IO93gm
|
837
|
307
|
|
2013-10-04 22:30
|
DK7FC
|
0.475685
|
-23
|
0
|
JN49ik
|
1
|
M0PAF
|
IO93gm
|
837
|
307
|
|
2013-10-03 04:18
|
DK7FC
|
0.475685
|
-14
|
0
|
JN49ik
|
1
|
G0KTN
|
IO81ti
|
813
|
289
|
|
2013-10-04 01:12
|
DK7FC
|
0.475688
|
-13
|
0
|
JN49ik
|
1
|
M0ITF
|
IO81wv
|
810
|
294
|
|
2013-10-02 03:12
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
G8JNJ/A
|
IO90hx
|
737
|
287
|
|
2013-10-03 16:06
|
DK7FC
|
0.475683
|
-25
|
0
|
JN49ik
|
1
|
G3NZP
|
IO91
|
726
|
292
|
|
2013-10-04 22:48
|
DK7FC
|
0.475685
|
-8
|
0
|
JN49ik
|
1
|
G3XIZ
|
IO92ub
|
697
|
298
|
|
2013-10-04 21:54
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
G3WCB
|
IO91rm
|
694
|
293
|
|
2013-10-02 19:36
|
DK7FC
|
0.475685
|
-7
|
0
|
JN49ik
|
1
|
G4CAO-2
|
IO91si
|
683
|
292
|
|
2013-10-03 00:00
|
DK7FC
|
0.475685
|
-13
|
0
|
JN49ik
|
1
|
G4CAO
|
IO91si
|
683
|
292
|
|
2013-10-02 04:12
|
DK7FC
|
0.475688
|
+8
|
0
|
JN49ik
|
1
|
G4KPX
|
JO02dj
|
675
|
302
|
|
2013-10-04 19:24
|
DK7FC
|
0.475685
|
-14
|
0
|
JN49ik
|
1
|
I5MXX
|
JN53ju
|
641
|
165
|
|
2013-10-02 18:00
|
DK7FC
|
0.475675
|
-24
|
0
|
JN49ik
|
1
|
I5EFO
|
JN53hu
|
638
|
166
|
|
2013-10-04 22:36
|
DK7FC
|
0.475685
|
-7
|
0
|
JN49ik
|
1
|
G6AVK
|
JO01ho
|
620
|
296
|
|
2013-09-29 00:18
|
DK7FC
|
0.475665
|
-11
|
0
|
JN49ik
|
1
|
G3TYB
|
JO01ii
|
605
|
294
|
|
2013-10-04 01:12
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
M0ELS
|
JO01
|
593
|
295
|
|
2013-10-04 17:12
|
DK7FC
|
0.475684
|
-13
|
0
|
JN49ik
|
1
|
F59706
|
JN07th
|
574
|
248
|
|
2013-10-04 01:12
|
DK7FC
|
0.475686
|
+6
|
0
|
JN49ik
|
1
|
IW4DXW
|
JN64bw
|
563
|
151
|
|
2013-10-04 10:42
|
DK7FC
|
0.475685
|
-29
|
0
|
JN49ik
|
1
|
G6GJT
|
JO01ri
|
556
|
295
|
|
2013-10-01 02:42
|
DK7FC
|
0.475689
|
-1
|
0
|
JN49ik
|
1
|
DF2FF
|
JO44th
|
546
|
6
|
|
2013-10-03 14:06
|
DK7FC
|
0.475690
|
-18
|
0
|
JN49ik
|
1
|
F6FLE
|
JO00tr
|
525
|
289
|
|
2013-10-01 04:06
|
DK7FC
|
0.475684
|
+5
|
0
|
JN49ik
|
1
|
DK6XY
|
JO53jv
|
516
|
15
|
|
2013-10-02 03:30
|
DK7FC
|
0.475690
|
+1
|
0
|
JN49ik
|
1
|
DG3LV
|
JO53gv
|
512
|
14
|
|
2013-10-02 20:12
|
DK7FC
|
0.475698
|
-20
|
-1
|
JN49ik
|
1
|
DL7AIE
|
JO62pt
|
493
|
39
|
|
2013-10-02 05:36
|
DK7FC
|
0.475677
|
-9
|
0
|
JN49ik
|
1
|
DF2LS
|
JO53dr
|
490
|
12
|
|
2013-10-04 18:24
|
DK7FC
|
0.475655
|
-5
|
0
|
JN49ik
|
1
|
OK1DWF
|
JO70qb
|
484
|
79
|
|
2013-10-04 22:18
|
DK7FC
|
0.475685
|
+2
|
0
|
JN49ik
|
1
|
PA0A
|
JO33de
|
449
|
339
|
|
2013-10-04 22:36
|
DK7FC
|
0.475684
|
-20
|
0
|
JN49ik
|
1
|
PA0LPN
|
JO22ux
|
446
|
333
|
|
2013-10-04 15:54
|
DK7FC
|
0.474935
|
-13
|
0
|
JN49ik
|
1
|
PA3FNY2
|
JO22nc
|
389
|
321
|
|
2013-10-04 17:06
|
DK7FC
|
0.474935
|
-10
|
0
|
JN49ik
|
1
|
PA3FNY
|
JO22nc
|
389
|
321
|
|
2013-10-01 13:00
|
DK7FC
|
0.475685
|
+6
|
0
|
JN49ik
|
1
|
F6CNI
|
JN19qb
|
389
|
266
|
|
2013-10-04 16:54
|
DK7FC
|
0.474935
|
-6
|
0
|
JN49ik
|
1
|
PA3FNY\2
|
JO22nc
|
389
|
321
|
|
2013-10-04 22:36
|
DK7FC
|
0.475685
|
+2
|
0
|
JN49ik
|
1
|
PA3ABK/2
|
JO21it
|
386
|
315
|
|
2013-10-02 03:42
|
DK7FC
|
0.475685
|
-6
|
0
|
JN49ik
|
1
|
DL-SWL
|
JO52hp
|
381
|
20
|
|
2013-10-02 19:36
|
DK7FC
|
0.503886
|
+4
|
0
|
JN49ik
|
1
|
IN3EFR
|
JN56pl
|
381
|
149
|
|
2013-10-04 22:42
|
DK7FC
|
0.475686
|
-4
|
0
|
JN49ik
|
1
|
IN3FCI
|
JN56qm
|
380
|
148
|
|
2013-10-02 04:24
|
DK7FC
|
0.475630
|
-21
|
0
|
JN49ik
|
1
|
NL8992
|
JO32fl
|
373
|
336
|
|
2013-10-04 02:12
|
DK7FC
|
0.475685
|
0
|
0
|
JN49ik
|
1
|
PI4THT
|
JO32kf
|
336
|
338
|
|
2013-10-04 22:30
|
DK7FC
|
0.475686
|
-3
|
0
|
JN49ik
|
1
|
OR7T
|
JO20ix
|
332
|
303
|
|
2013-10-04 17:54
|
DK7FC
|
0.475685
|
0
|
0
|
JN49ik
|
1
|
DL4RAJ
|
JN68kj
|
326
|
109
|
|
2013-10-04 22:30
|
DK7FC
|
0.475684
|
-2
|
0
|
JN49ik
|
1
|
DF6MK
|
JN68ik
|
313
|
109
|
|
2013-10-01 13:48
|
DK7FC
|
0.475685
|
-17
|
0
|
JN49ik
|
1
|
DC0DX
|
JO31lk
|
255
|
332
|
|
2013-10-02 18:42
|
DK7FC
|
0.475685
|
+9
|
0
|
JN49ik
|
1
|
HB9FGK
|
JN37
|
253
|
211
|
|
2013-10-02 17:18
|
DK7FC
|
0.475682
|
-3
|
0
|
JN49ik
|
1
|
F6ACU
|
JN38fc
|
222
|
229
|
|
2013-10-04 21:24
|
DK7FC
|
0.475685
|
-17
|
0
|
JN49ik
|
1
|
HB9LFT
|
JN47cl
|
221
|
190
|
|
2013-10-04 22:18
|
DK7FC
|
0.475685
|
+1
|
0
|
JN49ik
|
1
|
DL1DBC
|
JO41bi
|
217
|
349
|
|
2013-10-04 20:30
|
DK7FC
|
0.475712
|
-4
|
0
|
JN49ik
|
1
|
DK6NI
|
JN59ln
|
163
|
84
|
|
2013-10-04 17:12
|
DK7FC
|
0.475685
|
-14
|
0
|
JN49ik
|
1
|
DC0VD
|
JN39qw
|
111
|
301
|
|
2013-10-01 13:54
|
DK7FC
|
0.475685
|
-11
|
0
|
JN49ik
|
1
|
DJ7KA
|
JN48mn
|
100
|
166
|
|
2013-10-03 22:24
|
DK7FC
|
0.475685
|
+9
|
0
|
JN49ik
|
1
|
DD7PC
|
JN49ax
|
77
|
322
|
|
2013-10-02 19:42
|
DK7FC
|
0.475685
|
+13
|
0
|
JN49ik
|
1
|
DK2DB
|
JN48fw
|
58
|
198
|
|
2013-10-02 03:18
|
DK7FC
|
0.475685
|
+12
|
0
|
JN49ik
|
1
|
DK6UG
|
JN49cm
|
37
|
285
|
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4142 / Virus Database: 3604/6724 - Release Date: 10/04/13
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