Those tones are not sine waves.
I wasn't so sure about this. Over the years I've never heard this
mentioned, and technical references like NIST 25-67 and 668 describe
the audio tones as being derived from the cesium standards, with no
mention of harmonic content. So I sent an email to WWV asking
I measured the 2nd and 3rd harmonic of WWV's 600 Hz tone this morning
using an HP 8568B spectrum analyzer set at 15 MHz, 30 Hz resolution,
connected to an antenna. This avoids the harmonic generation that might
be found in a receiver's audio stages, for example, such as when
measuring tone
I think we're barking up the wrong tree. The real travesty of WWV's signal is,
and has been for a long while, the *voice* announcements of solar conditions,
weather conditions, and navigation. Have you noticed? It sounds like they use a
100-year-old microphone that has been left out in the rain
I measured the 2nd and 3rd harmonic of WWV's 600 Hz tone this morning
using an HP 8568B spectrum analyzer set at 15 MHz, 30 Hz resolution,
The 2nd harmonic at 1200 Hz is approximately 18 dB down from the 600 Hz
sideband.
The 3rd harmonic at 1800 Hz is about 30 dB down from the 600
I see two sidebands very close to either side of the carrier, and identical
amplitude/spacing sidebands on either side of the tones. They are at about
+/-60Hz and +/-100 Hz. I assumed that was intentional modulation since they
also appear next to the carrier.
At least it should rule out
They probably use a speaker phone for the recording, yuk.
You guys should grab the P3's display and post the pictures.
I saw the double lines a couple of months ago, I thought they had changed
their format.
Randy
K7AGE
__
Elecraft
WWV has 100 Hz data transmission and you will see the sidebands at ±100 Hz.
Jack K8ZOA
On 11/8/2011 6:21 PM, Ron D'Eau Claire wrote:
I see two sidebands very close to either side of the carrier, and identical
amplitude/spacing sidebands on either side of the tones. They are at about
+/-60Hz
Guys;
Read the information at the NIST / WWV web site. There is no
microphone. The voices are all synthesized!
Jack B, W6FB
On Nov 8, 2011, at 3:24 PM, Randy Hall wrote:
They probably use a speaker phone for the recording, yuk.
You guys should grab the P3's display and post the pictures.
On 11/8/2011 3:24 PM, Randy Hall wrote:
You guys should grab the P3's display and post the pictures.
OK. www.foothill.net/~andreaj/WWV_7KHz.bmp This is a 7KHz span with
the marker on the first sideband [high side]. You can see the 2nd and
3rd harmonics, and maybe the 4th although that
On 11/8/2011 4:22 PM, Fred Jensen wrote:
www.foothill.net/~andreaj/WWV_1KHz_beep is the 1 KHz beep at the start
of each minute.
Well, fingers don't always follow commands from HQ. Put a .bmp at the
end of that URL.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2012 Cal QSO
On 11/8/2011 3:21 PM, Ron D'Eau Claire wrote:
The WWV time announcements from either the mainland or
Hawaii are fine.
Those are, of course, high quality recorded announcements. The male
voice is that of Lee Rodgers, a long-time San Francisco broadcaster at
station KGO, once the west-coast
On Nov 8, 2011, at 5:21 PM, Phil Kane wrote:
On 11/8/2011 3:21 PM, Ron D'Eau Claire wrote:
The WWV time announcements from either the mainland or
Hawaii are fine.
Those are, of course, high quality recorded announcements. The male
voice is that of Lee Rodgers, a long-time San
While using WWV to fall back, I reduced the span while watching WWV
such that the VFO A marker was about half the width of the screen, and
there appeared WWV's transmitted spectrum [Never did this before ...
cool!]. 10 MHz WWV is about 25 over S9, I'm on AM with 3.0 KHz DSP BW.
I have the
Those tones are not sine waves. They have distinct harmonic content
that makes them a little sharp sounding, rather than the soft sound
of a pure sine wave. What you're looking at is the components that
make it sound that way.
73, Guy.
On Mon, Nov 7, 2011 at 7:23 PM, Fred Jensen
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