137 kHz WSPR beacon
In
April 2009 i built a linear transverter for 137KHz based on the suggestions
from Dave (AA1A) and Gus (SM6BHZ) which allow to run all digital modes.
The
design is very simple. Heart is a mixer with inputs from my transceiver and
from an oscillator (a cheap 10MHz Quarzoszillator from an electronic shop will
do)
now (Jan.2011) all parts (Mixer, 10MHz
GPSO, Driver PA, 250W PA) installed in an old PC tower:
In
my first test i used a “ready-to-go” mixer module from Anzac MD-141. A 10.137MHz
signal from my transceiver is mixed with a 10MHz LO signal to a 0db (1mW)
137KHz signal followed by a low pass filter and a 5W amplifier (TDA-2003). I
not changed anything on my FT-857. I burn down the 5W on 10MHz with a 30db
attenuator to 5mW.
On
23.Apr.2009 i run this low power setup as WSPR beacon on 136.280KHz dial
frequency and received from Michael in JN49bf following signal report J (many thanks for this)
|
Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
|
2009-04-23 18:02 |
DD7PC |
0.137833 |
-19 |
0 |
JN49ax |
0.005 |
MICHAEL |
JN49bf |
84 |
176 |
|
2009-04-23 17:54 |
DD7PC |
0.137834 |
-20 |
1 |
JN49ax |
0.005 |
MICHAEL |
JN49bf |
84 |
176 |
|
2009-04-23 17:46 |
DD7PC |
0.137833 |
-19 |
0 |
JN49ax |
0.005 |
MICHAEL |
JN49bf |
84 |
176 |
|
2009-04-23 17:38 |
DD7PC |
0.137834 |
-19 |
-1 |
JN49ax |
0.005 |
MICHAEL |
JN49bf |
84 |
176 |
This proves the transverter concept. It allows easily to build a transverter for
500Khz once we have permissions for this band in
5.+6.March 2010 I added my 250W Mosfet and did some more
WPSR Tests on 137KHz (dial 135.5KHz). I got about 100W out –> with my
antenna setup that’s abt. 2mW ERP.
Spots from WSPRNET:
|
Timestamp |
Call |
MHz |
SNR |
Drift |
Grid |
Pwr |
Reporter |
RGrid |
km |
az |
|
2010-03-07 10:44 |
DD7PC |
0.137007 |
-18 |
0 |
JN49ax |
0.002 |
DK6NI |
JN59ln |
215 |
101 |
|
2010-03-07
10:40 |
DD7PC |
0.137007 |
-19 |
0 |
JN49ax |
0.002 |
DK6NI |
JN59ln |
215 |
101 |
|
2010-03-07
10:36 |
DD7PC |
0.137007 |
-18 |
0 |
JN49ax |
0.002 |
DK6NI |
JN59ln |
215 |
101 |
|
2010-03-07
10:32 |
DD7PC |
0.137007 |
-19 |
0 |
JN49ax |
0.002 |
DK6NI |
JN59ln |
215 |
101 |
|
2010-03-06
12:56 |
DD7PC |
0.136996 |
-16 |
0 |
JN49ax |
0.002 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-06
12:54 |
DD7PC |
0.136996 |
-16 |
0 |
JN49ax |
0.002 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-06
12:36 |
DD7PC |
0.136996 |
-17 |
0 |
JN49ax |
50 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-06
12:34 |
DD7PC |
0.136996 |
-4 |
0 |
JN49ax |
50 |
MICHAEL |
JN49bf |
84 |
176 |
|
2010-03-06
10:18 |
DD7PC |
0.136996 |
-5 |
0 |
JN49ax |
50 |
MICHAEL |
JN49bf |
84 |
176 |
|
2010-03-05
18:16 |
DD7PC |
0.136996 |
-28 |
0 |
JN49ax |
5 |
PA3FNY |
JO22nc |
312 |
320 |
|
2010-03-05
18:06 |
DD7PC |
0.136996 |
-27 |
0 |
JN49ax |
5 |
PA3FNY |
JO22nc |
312 |
320 |
|
2010-03-05 17:58 |
DD7PC |
0.136996 |
-28 |
0 |
JN49ax |
5 |
PA3FNY |
JO22nc |
312 |
320 |
|
2010-03-05 17:36 |
DD7PC |
0.136996 |
-30 |
-1 |
JN49ax |
0.5 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-05 17:36 |
DD7PC |
0.136996 |
-30 |
-1 |
JN49ax |
0.5 |
PA3FNY |
JO22nc |
312 |
320 |
|
2010-03-05 17:32 |
DD7PC |
0.136996 |
-30 |
0 |
JN49ax |
0.5 |
PA3FNY |
JO22nc |
312 |
320 |
|
2010-03-05 15:50 |
DD7PC |
0.136996 |
-21 |
0 |
JN49ax |
0.5 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-05 15:44 |
DD7PC |
0.136996 |
-20 |
0 |
JN49ax |
0.5 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-05 14:06 |
DD7PC |
0.136996 |
-21 |
0 |
JN49ax |
0.5 |
DF6NM |
JN59nk |
230 |
104 |
|
2010-03-05 14:04 |
DD7PC |
0.136996 |
-20 |
0 |
JN49ax |
0.5 |
DF6NM |
JN59nk |
230 |
104 |
Some more WSPR transmissions in 2011:
2011-02-04 23:08 DD7PC 0.137504 -24 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 23:04 DD7PC 0.137504 -27 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 23:00 DD7PC 0.137503 +1 0 JN49ax 5 F6CNI JN19qb 352 255
2011-02-04 23:00 DD7PC 0.137503 -21 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 22:50 DD7PC 0.137504 -23 -1 JN49ax 5 PA0A JO33de 377 342
2011-02-04 22:50 DD7PC 0.137504 -22 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 22:04 DD7PC 0.137503 +1 0 JN49ax 5 F6CNI JN19qb 352 255
2011-02-04 22:00 DD7PC 0.137503 -1 0 JN49ax 5 F6CNI JN19qb 352 255
2011-02-04 21:42 DD7PC 0.137504 -23 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 21:38 DD7PC 0.137503 -25 0 JN49ax 5 F5WK JN18hp 420 251
2011-02-04 21:00 DD7PC 0.137504 -22 0 JN49ax 5 PA3FNY JO22nc 312 320
2011-02-04 20:56 DD7PC 0.137503 -27 0 JN49ax 5 PA3FNY JO22nc 312 320
2011-02-04 20:52 DD7PC 0.137504 -24 0 JN49ax 5 PA3FNY JO22nc 312 320
2011-02-04 20:48 DD7PC 0.137504 -21 0 JN49ax 5 PA3FNY JO22nc 312 320
2011-01-14 14:50 DD7PC 0.137563 +1 0 JN49ax 5 DF4PV JN49ax 0 0
2011-01-14 14:48 DD7PC 0.137563 +5 0 JN49ax 5 DF4PV JN49ax 0 0
2011-01-14 14:44 DD7PC 0.137562 0 0 JN49ax 5 DF4PV JN49ax 0 0
2011-01-14 14:42 DD7PC 0.137562 +1 0 JN49ax 5 DF4PV JN49ax 0 0
Some more WSPR transmissions in 2012:
2012-02-24 15:08 DD7PC 0.137557 -14 -1 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 15:08 DD7PC 0.137504 -23 -1 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 15:00 DD7PC 0.137555 -12 0 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 15:00 DD7PC 0.137504 -23 -1 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 14:48 DD7PC 0.137552 -16 -1 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 14:48 DD7PC 0.137504 -18 -1 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 14:40 DD7PC 0.137549 -17 0 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 14:40 DD7PC 0.137504 -2 -1 JN49ax 0.5 F6CNI JN19qb 352 255
2012-02-24 14:28 DD7PC 0.137544 -15 -1 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 14:28 DD7PC 0.137504 -2 -1 JN49ax 0.5 F6CNI JN19qb 352 255
2012-02-24 14:12 DD7PC 0.137581 -22 0 JN49ax 0.5 DC0VD JN39qw 48 265
2012-02-24 13:40 DD7PC 0.137504 -26 -1 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 13:30 DD7PC 0.137504 -27 0 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 13:20 DD7PC 0.137504 -30 0 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 08:58 DD7PC 0.137504 -17 -1 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 08:54 DD7PC 0.137504 -17 0 JN49ax 0.5 DF2JP JO31jg 169 329
2012-02-24 08:50 DD7PC 0.137504 -18 -1 JN49ax 0.5 DF2JP JO31jg 169 329
and in new mode OPERA:
23:01 136 DD7PC de
M0DTS Op8 807 km -32 dB in Yarm, IO94IL with 150w + 31m wire + 7mH LC
23:01 136 DD7PC de
G4FVP Op8 823 km -34 dB in Darlington with 150w + 31m wire + 7mH LC
22:15 136 DD7PC de
F6CNI Op8 352 km -29 dB in nr Paris with 150w + 31m wire + 7mH LC
22:15 136 DD7PC de
M0DTS Op8 807 km -29 dB in Yarm, IO94IL with 150w + 31m wire + 7mH LC
22:15 136 DD7PC de
G4FVP Op8 823 km -29 dB in Darlington with 150w + 31m wire + 7mH LC
21:55 136 DD7PC de
G4FVP Op8 -31 dB in Darlington
21:55 136 DD7PC de
F6CNI Op8 352 km -27 dB in nr Paris with 150w + 31m wire + 7mH LC
21:55 136 DD7PC de
G4WGT Op8 835 km -32 dB in IO83qo, nr Preston. with 150w + 31m wire + 7m
21:34 136 DD7PC de
F6CNI Op8 352 km -30 dB in nr Paris with 150w + 31m wire + 7mH LC
20:23 136 DD7PC de
F6CNI Op8 352 km -32 dB in nr Paris with 80w + 31m wire + 7mH LC
20:02 136 DD7PC de
F6CNI Op8 352 km -31 dB in nr Paris with 80w + 31m wire + 7mH LC
20:02 136 DD7PC de
M0DTS Op8 807 km -32 dB in Yarm, IO94IL with 80w + 31m wire + 7mH LC
19:42 136 DD7PC de
F6CNI Op8 352 km -31 dB in nr Paris with 80w + 31m wire + 7mH LC
16:11 136 DD7PC de
M0DTS Op8 807 km -29 dB in Yarm, IO94IL with 80w + 31m wire + 7mH LC
16:11 136 DD7PC de G8HUH Op8 788 km -34 dB in Somerset with 80w + 31m wire + 7mH LC
my signal at DF6NM grabber exactly at 137KHz!
afterwards I did some transmission test in DFCW and
chirped Hell. Both very well copied in DF6NM grabber… J