Hi VLF, Since 22 UTC, a carrier with 300 mA antenna current is running at 6470.005 Hz. The ERP is about 50 uW. That's the next step in the series of experiments transmitting on frequencies down to DC
Hi Markus, Paul, VLF, Thanks for the feedback. The trace at DL0AO looks very good. On 8270 there is almost nothing during daytime but on 6470 we have a stable 10 dB SNR in 424 uHz, allowing a 20 char
Yes, will be available in the next upgrade which will be ready soon (still testing). You may as well use 8K19A or even 4K15A. If you look at the big table at the end of http://abelian.org/ebnaut/ops
Hi Paul, Am 04.10.2017 11:07, schrieb Paul Nicholson: You may as well use 8K19A or even 4K15A. If you look at the big table at the end of http://abelian.org/ebnaut/ops.shtml you can see there's no f
Unfortunately, nothing at all seen here on 6470Hz. Using the same system as on 8270, but with filter frequency changed, so should be OK. I am not using any preamplification here, just the LF antenna
I think this is typical of short ranges. When I model the propagation using ray tracing, it needs the first dozen or more rays (ground wave, 1-hop, 2-hop, 3-hop and so on) to produce something like a
Got a decode with good Eb/N0. Message not shown, but confirmed by Stefan. found rank 0 ber 3.4896e-01 Eb/N0 4.1 M -8.871037960e-01 [x] ps [ 0 0 0 0 0] carrier phase: 1.8 deg carrier Eb/N0: 6.1 dB car
Night 2nd/3rd: -24.26 dB in 1Hz, phase 34.9 deg Day 3rd: -24.31 dB in 1Hz, phase 100.1 deg Night 3rd/4th: -32.16 dB in 1Hz, phase 24.3 deg Day 4th: -23.26 dB in 1Hz, phase 102.0 deg Got a strong deco
maybe Stefan could qsy a bit? for example i'm 19.8 wavelengths from Stefan (and Paul is almost the same). shifting 81 Hz either way would make the path 1/4 wavelength longer/shorter. if there are som
Hi Paul, Am 05.10.2017 09:16, schrieb Paul Nicholson: Day 4th: -23.26 dB in 1Hz, phase 102.0 deg Ehm, that is strange. Because i have not been on air yesterday in daytime. I stopped the carrier at 7
Hello Alex, What a surprise! This is most amazing. You got the message correctly over a 1985 km distant land path and even with Eb/N0 = 6.1 dB :-) 4 characters would have been possible as well :-) I'
Hi Jacek, VLF, First, let me change something in the next transmit announcement. It could make sense to start an hour earlier because the sunrise will be earlier near Moscow. Here, the QRN starts to
You're right: command history shows I used the 3rd instead of 4th by mistake in the vtread command. Using your carrier to roughly calibrate the new E-field rx, and tweaking blanker settings, now get
Hi Paul, The QRN is amazingly low these days at day-time. Let's try to do the 100 character experiment this weekend. With some luck, just 2 days could work? f = 6470.1000 Hz Start time: 07.October.20
OK. But next week I must take down the new E-field rx to continue work. I have a lot to finish before it can go 'live' properly. 16K21 would have better chance of decode, but then you would have 3.5
A clear decode after stacking 2 nights: 5th/6th Eb/N0 -2.2 dB phase -148.4 deg 6th/7th Eb/N0 +0.9 dB phase -165.4 deg Stacked: Eb/N0 +2.4 dB phase -158.3 deg The message is the name of a well known p
The message also decodes just from the overnight 6/7th transmission. Here is the error map http://abelian.org/vlf/tmp/171007a.gif BER 38.1% decoding at rank 1 with constant reference phase. -- Paul N
Am 06.10.2017 19:48, schrieb Paul Nicholson: OK. But next week I must take down the new E-field rx to continue work. I have a lot to finish before it can go 'live' properly. All right. Now the 2nd tr
