LF/VLF scan

LF/VLF band scan between 3 and 150 kHz during last Field Day. Equipment was a 100 mt long wire, homemade converter (SO42P mixer) and Yaesu FT817 (I.F. 28 MHz).

Category:

Science & Technology

Tags:

• iw3fzq
• lf
• vlf
• long
• wave
• time
• signals
• loran
• omega
• alpha
• utility
• cw
• wire
• homemade
• field
• day

[lustrup]

WOnderful recording. What type of up converter are you using?

JAn

[iw3fzq]

HI Jan ! For this test I used an homemade converter with SO42P mixer. I've lose the schematic diagram but a similar item can found on Google by searching SO42P vlf converter.

The signals in the test can be better... I forgotten the attenuator at home :-(

[Amishman35]

Where are you getting these signals? I tried using a BT878 capture ADC with ferrite attached to get everything below 400 Khz but I get only noise and some continuous sine carriers. I'm in the USA.

[iw3fzq]

I made this test some weeks ago in a deserted place, distant to every noise source. You need a sensitive receiver and a good antenna. However, also 10 meter of wire are sufficient to receiver lots of signals. Enrico.

[PacificAtlanticPearl]

fett



[maciejwrotek]

cool, that is what i wanted to hear. beeps, bleeps and sweeps :P Reminds me spaceballs movie. why it shows 10m band ?

[29Hz]

I take it this this rig has minimum increment steps of 1Hz? Pretty impressive!

[Amishman35]

I was able to get an FSK modulated signal and a beacon at 382 kHz at 306.5 kHz with both the BT878 and my Grundig G5. I know there's supposed to be WWVB down at 60kHz--my clocks can synchronize to it just fine, but I can't make it out in the waterfall. I wish I had a portable radio capable of going that low, with the BT878 I can only make one recording, then I have to restart Ubuntu, and only arecord works with it, so I can't do it real time. (feel free to cry me a river).