Hi LF,
It is a nice function to generate the frequency directly with that
module. But for WSPR it can't be used. However it could be used for a LO
frequency in an up-converter!
I got good reception of IK1HGI in the last days. His frequency, or our
frequency, seems to be accurate. Same applies for IW4DXW and IZ7SLZ.
Smallest frequency deviations may be due to propagation!?
DK7FC JN49IK Opera-32 correlation http://df6nm.bplaced.net/opera/opds.zip
date time call distance frequency bandwidth snr correlation
2017-06-23 05:36:47 IK1HGI 449km 137493.000Hz 2mHz -44.4dBOp 93% 17.1dB
2017-06-23 05:02:05 IK1HGI 449km 137493.000Hz 2mHz -44.3dBOp 100% 16.7dB
2017-06-23 04:27:24 IK1HGI 449km 137493.000Hz 2mHz -47.2dBOp 91% 15.4dB
2017-06-23 02:43:22 IK1HGI 449km 137493.000Hz 1mHz -51.9dBOp 100% 18.4dB
2017-06-22 05:37:20 IW4DXW 563km 137517.001Hz 2mHz -47.9dBOp 91% 16.8dB
2017-06-22 04:37:19 IW4DXW 563km 137517.000Hz 9mHz -44.5dBOp 92% 18.4dB
2017-06-22 03:37:19 IW4DXW 563km 137517.000Hz 9mHz -46.0dBOp 92% 16.6dB
2017-06-22 02:37:20 IW4DXW 563km 137517.000Hz 10mHz -42.0dBOp 91% 20.1dB
2017-06-22 01:37:20 IW4DXW 563km 137517.000Hz 10mHz -42.1dBOp 91% 19.6dB
2017-06-22 00:37:19 IW4DXW 563km 137517.000Hz 5mHz -42.1dBOp 92% 19.8dB
2017-06-21 23:37:19 IW4DXW 563km 137517.000Hz 10mHz -41.8dBOp 92% 20.3dB
2017-06-21 22:37:19 IW4DXW 563km 137517.001Hz 4mHz -40.4dBOp 92% 20.2dB
2017-06-21 05:37:19 IW4DXW 563km 137517.000Hz 3mHz -34.1dBOp 92% 19.2dB
2017-06-21 04:37:19 IW4DXW 563km 137517.000Hz 3mHz -31.7dBOp 92% 20.1dB
2017-06-21 03:37:19 IW4DXW 563km 137517.000Hz 3mHz -34.2dBOp 92% 19.1dB
2017-06-21 02:37:19 IW4DXW 563km 137517.000Hz 3mHz -36.2dBOp 92% 19.5dB
2017-06-21 01:37:19 IW4DXW 563km 137517.000Hz 2mHz -37.1dBOp 92% 19.8dB
2017-06-21 00:37:19 IW4DXW 563km 137517.000Hz 3mHz -37.0dBOp 92% 19.4dB
2017-06-21 00:03:11 IW4DXW 563km 137517.000Hz 3mHz -35.9dBOp 100% 19.7dB
2017-06-20 23:20:33 G3XDV 682km 137470.029Hz 16mHz -44.2dBOp 100% 16.9dB
2017-06-20 08:17:41 IK1HGI 449km 137493.000Hz 2mHz -45.8dBOp 93% 17.9dB
2017-06-20 07:43:00 IK1HGI 449km 137493.000Hz 2mHz -42.4dBOp 100% 18.3dB
2017-06-20 07:08:18 IK1HGI 449km 137493.000Hz 2mHz -45.5dBOp 95% 15.9dB
2017-06-20 05:24:14 IK1HGI 449km 137493.000Hz 4mHz -44.6dBOp 100% 16.3dB
2017-06-20 04:49:34 IK1HGI 449km 137493.000Hz 3mHz -42.8dBOp 99% 18.5dB
2017-06-20 03:40:12 IK1HGI 449km 137492.999Hz 8mHz -41.8dBOp 100% 15.3dB
2017-06-20 03:05:31 IK1HGI 449km 137493.000Hz 2mHz -45.3dBOp 97% 15.9dB
2017-06-20 02:30:51 IK1HGI 449km 137493.000Hz 2mHz -40.4dBOp 100% 18.7dB
2017-06-20 01:56:09 IK1HGI 449km 137493.000Hz 3mHz -44.5dBOp 89% 17.4dB
2017-06-20 01:21:28 IK1HGI 449km 137493.000Hz 7mHz -38.7dBOp 100% 19.9dB
2017-06-20 00:46:47 IK1HGI 449km 137492.999Hz 4mHz -41.4dBOp 93% 18.2dB
2017-06-20 00:33:24 IZ7SLZ 1159km 137494.999Hz 4mHz -30.7dBOp 100% 19.7dB
2017-06-20 00:12:05 IK1HGI 449km 137492.999Hz 4mHz -44.5dBOp 100% 16.8dB
2017-06-19 23:43:24 IZ7SLZ 1159km 137495.000Hz 4mHz -36.8dBOp 100% 20.5dB
73, Stefan
Am 23.06.2017 11:24, schrieb Domenico IZ7SLZ:
Hi LF,
in these days, Tony IK1HGI from JN45jj, is transmitting some (not
announced) EbNaut test message on LF and he is active in op32. He is
using a very stable exciter formed by a GPS Neo-7 which time port TP5
has been reprogrammed to output directly the operating frequency (i.e.
137493,000 Hz).
I invite all interested LF operators to try this solution becouse it's
cheap, easy to built and it works !
Riccardo IW4DXW, who had this idea, is writing some
post to the group with his indications on buffering the TP5 signal,
obtain a BPSK and ASK modulator, reprogramming the GPS parameters.
Erp transmitted by Tony is low due to very short antenna placed on his
balcon, short cap-hat wires, poor ground system and low power output
(around 70 W) with some mismatching.
So catching his signal is a challenge for me in JN80nu (abt. 920 km).
Last night i saw some traces of his signal on my opds Spectrum Lab
waterfall but no opera detections were possibile even by reducing
thresholds in opds.ini.
I have also used Paul Nicholson's vlfrx-tools programs to record the
audio coming from LF receiver. Then i tried this morning to obtain 4
hour-long FFT centered on IK1HGI qrg after filtering and blanking
the signal.
I got an evident peak that i'm almost sure that comes from Tony.
These are the commands that i have used (i'm new on vlfrx-tools so i
hope do not make big mistakes):
vtread -v -T2017-06-22_23:40,+16000 /media/iz7slz/Storage/ |
vtfilter -v -h bp,f=1500,w=2000 |
vtblank -v -a2 -d0 -t10 |
vtnspec -v -f 1493 -w0.02 -r6.25e-5 > spectrum.dat
that vtblank settings comes out after many attempts.
73, Domenico IZ7SLZ
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