Jim Time is correct. I'm reading frequency as 29449 within a couple mHz. Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2 WG2XBA/3 ! Bob, how accurate is your frequency calibration? Jim AA5BW --Original Message-- F
Here is a four hour integration of the signal in 69 uHz bandwidth http://abelian.org/vlf/tmp/29499_140302a.gif Keying sidebands begin to become significant at this resolution. The signal may be a lit
Thanks Jay. Later I will make a spectrogram (the signal is recorded) but I don't think I will be able to resolve the Morse. I am happy that the tx preserves carrier phase in between dots otherwise i
I don't know the switch-on time but here is a series of 10 minute measurements in 1.66 mHz bandwidth, 2014-03-01_23:25:00 0.02 fT -58.9 deg 2014-03-01_23:30:00 0.02 fT -173.7 deg 2014-03-01_23:35:00
2014-03-02_06:00:00 0.10 fT 8.3 deg 2014-03-02_06:15:00 0.11 fT 20.2 deg 2014-03-02_06:30:00 0.13 fT 29.4 deg 2014-03-02_06:45:00 0.08 fT 28.4 deg 2014-03-02_07:00:00 0.04 fT 33.9 deg Phase lead is s
I ran a 24 hour plot giving 2014-03-01 to LWPC to select its built-in IRI parameters http://abelian.org/vlf/tmp/lwpc140301a.gif LWPC failed to converge between 11:00 and 16:00 UT and the nighttime ph
Paul, Bob, XBA group, your work is just amazing! Congratulations! Best wishes, Markus (DF6NM) From: [email protected] Paul Nicholson Sent: Sunday, March 02, 2014 6:54 AM To: rsgb_lf_group@blackshee
For comparison to Paul's graph, here is a simulated spectrum of four repetitions of the emitted qrss-60 "XBA1" sequence, total duration 4 x 55 minutes. http://dl.dropboxusercontent.com/u/26404526/xba
Hi Warren I think the 70kHz "boundary" is just the point at which the Earth-Ionosphere waveguide supports so many different modes that the modelling becomes difficult and the ray path is as effective
Paul Note that Bob's transmission did not resume until well after the 2330Z suggested time. I didn't have the grabber running at the time but would estimate that it was ~0015Z. His end time last nigh
Signal faded out by about 07:15 UT or switched off: 2014-03-02_05:45:00 0.12 fT 9.8 deg 2014-03-02_06:00:00 0.10 fT 8.3 deg 2014-03-02_06:15:00 0.11 fT 20.2 deg 2014-03-02_06:30:00 0.13 fT 29.4 deg 2
A spectrogram in 1/120 seconds = 8.33 mHz resolution http://abelian.org/vlf/tmp/29499_140302f.gif The brightness is normalised to the background noise level and the Z scale is S/N power ratio (not dB
There has been a "relay" of the information. Though most do not receive above 24Khz Alan -- Original Message -- From: [email protected] Warren Ziegler To: [email protected] rsgb_lf_group@bl
Hi Bob Almost certainly there will be "skywave" At 30 miles the ground and skywaves may be out of phase and near the same strength. We can detect two hop in the UK at 70miles range on 19.6kHz Anthorn
Hi Warren, Already done... I have forwarded some of the info in the VLF group at yahoo. Btw detailed times and frequencies of transmission, posted "here or there" well in advance, would be much appre
Hi Bob if you mean "skywave" or ionospheric returns? that occurs day and night at LF and VLF the skywave is weaker in daytime at LF due to a portion of absorbing D-lyer below the apparent reflection
There is a strong signal received Todmorden UK 53.7N,2.07W at 29499.000 +/- 0.01 Hz. Begins around 00:30 UT +/- 15 mins and continues. Very clear, 20dB above noise in 0.5 mHz bandwidth, strength abou
correction ... 29499 within a couple mHz. Jay Jim Time is correct. I'm reading frequency as 29449 within a couple mHz. Jay W1VD WD2XNS WE2XGR/2 WG2XRS/2 WG2XBA/3 -- Original Message -- From: "hvanesc
Analysing in narrower bandwidth, there are small sidebands at +/- 0.00833 Hz so I guess the tx is sending Morse at 120 second dot length. Signal still present, to 05:30 UT. -- Paul Nicholson --
