http://www.lazygranch.com/sound/25khz_snip.wav
I recorded this a bit north of San Francisco. I didn't log the mode,
but I'm sure I was in sideband (unknown which).

ID????

wrote:

http://www.lazygranch.com/sound/25khz_snip.wav
I recorded this a bit north of San Francisco. I didn't log the mode,
but I'm sure I was in sideband (unknown which).

ID????


25 khz or 25 Mhz? I doubt there's anything except a few data signals
around 25 khz, I know WWVB operates at 60 khz. 25 Mhz, on the other
hand, is on the upper end of the HF spectrum, around the CB band. I
believe some CB freebanders may hang out in that area.


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25Khz, not 25Mhz.

You have time interval signals and other strange things down in the VLF
range. I am not sure what this one is. Sometimes, there are narrow shift
data transmissions down there.

Pete

wrote in message
oups.com...
25Khz, not 25Mhz.

wrote:

25Khz, not 25Mhz.

Thats' very low for good reception on a typical shortwave antenna. What
kind of antenna were you using? What receiver? I would suspect some kind
of local signal (noise?) getting into the radio on such a low frequency
before assuming it is coming from long distance propagation but maybe
you are close to the transmitter.

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It's on a Wellbrook ala 100. The signal is real. If you listen to the
signal, it sounds like FSK, but a software decoder (skysweep) I tried
won't lock on it. The radio is a AR7030, so the low frequency reception
is pretty good. I have no trouble getting the 100khz loran, and 60khz
time signal.I've even demoded DGPS.

wrote in news:1110418417.048294.322430
@g14g2000cwa.googlegroups.com:

http://www.lazygranch.com/sound/25khz_snip.wav
I recorded this a bit north of San Francisco. I didn't log the mode,
but I'm sure I was in sideband (unknown which).

ID????


Submarine attack orders?

That was my guess, the the vlf.it website says all that stuff is around
8khz. I was probably within 20 miles of a coast guard antenna farm when
I recorded the signal.