This came though a listserv. There's a "mystery" signal on 10
meters. The puzzle is that this signal has been heard across the
country.

==================== Start Copy ==

GE er GM, All.

Hr flws sig rept 28.635Khz,

Time 0508Z (0008R) 4 JAN 2005

Sig recieved on Icom IC-746PRO, equipped with high stability crystal
freq standard, fed from GAP Titan DX vertical.

Sig taken in USB position after verfifying zero beat in CW of
28.635KHz.

Lvl approx S6-7.

I then applied sig to MixW program, expanded waterfall to X5 scale,
and
used CW mode to get a single cursor I could work with. This signal
looks like, or very similar to, a carrier tonepack, or a telemetry
trace
of some sort.

The signal is composed of 14 discrete tones, all frequency modulated
to
some degree, but most constant.
the frequencies a
436.0 Hz
705.0 Hz
776.0 Hz
805.0 Hz
831.0 Hz
909.0 Hz
993.0 Hz
1187.0 Hz
1227.0 Hz
1274.0 Hz
1348.0 Hz
1772.0 Hz
1816.0 Hz
2000.0 Hz

The 1348 Hz signal was frequency modulated in a slow digital pattern
and also amplitude modulated in a slow digital pattern
which did not correspond to Morse, Baudot, ASCII, or any other pattern
I
could pick off the top of my head. The FM
is 24 Hz shift, from 1361 Hz to 1336 Hz. I didn't take the time to
measure the amplitude excursions, I wanted to get this posted, because

I',m getting kind of tired --hi--...

I made no attempt to make these numbers work out. I eyeballed the
center
freq of each waterfall trace, as well as the edges of the FM
modulation
of the 1348 Hz trace. It was only after I looked at all the numbers
did
I realize that they all were exact freqs, I.E. no decimal frequencies,

and I was extremely suprised to find the exact 25 Hz FM deviation on
the
1348 Hz trace.

Given these results I have reasonably high confidence in my findings,
and that they are correct. I will continue to monitor this freq
tomorrow and see if I can't make some kind of sense out of this. I am

reasonably certain that I am seeing a carrier tonepack, or a telemetry

tonepack. When I first was looking at the traces, One of them (I
forget
which now) seemed to be FM modulated as a time reference, as the
deviation was all one direction (center downward) and at regular
squarewave like intervals. This particular trace ceased the behavior
when I got around to expanding the waterfall (naturally) but I am
determined to track this thing down and get a handle on it. It
doesn't
sound like any 16 channel tonepack with which I am familiar, nor any
telemetry with which I am familiar, (Yup, I've heard ans 'scoped a
lot
of them, most of which I still can't talk about), but heck, this is
the
21st century--hi--

Thanks to this group for a wonderful mystery!! Sometimes you have to
get off the MARS nets, or chasing CW DX all nite, and solve these
things
(if they can be solved). Since I am retired disabled, I have all the
time in the world to pick around at this enigma.

Hr fols my QRZ.com info for those plotting the sig repts:
QSL Mgr: Buro
Coordinates: 39.956267 -75.274357
County: Delaware
Grid: FM29iw
Area Code: 610
GMT Offset: -5
Time Zone: Eastern
Has DST?: Y
==================== End Copied report ==

I fired up my SB-303. At 9:00 PM EST Jan 4, 2005. I copied the
signal S-5. Very readable on a 50 foot piece of wire hanging out
my 2nd floor window.

I can't add anything to the analysis.

de ah6gi/4

Yo!

Birdies in the IC 746pro!
Try another rig.

73 de F8BOE Olivier ...-.-



"No Spam " No a écrit dans le message de news:
ifgU75G3LLdo-pn2-XtX4ucNdH3gp@localhost...
This came though a listserv. There's a "mystery" signal on 10
meters. The puzzle is that this signal has been heard across the
country.

==================== Start Copy ==

GE er GM, All.

Hr flws sig rept 28.635Khz,

Time 0508Z (0008R) 4 JAN 2005

Sig recieved on Icom IC-746PRO, equipped with high stability crystal
freq standard, fed from GAP Titan DX vertical.

Sig taken in USB position after verfifying zero beat in CW of
28.635KHz.

Lvl approx S6-7.

I then applied sig to MixW program, expanded waterfall to X5 scale,
and
used CW mode to get a single cursor I could work with. This signal
looks like, or very similar to, a carrier tonepack, or a telemetry
trace
of some sort.

The signal is composed of 14 discrete tones, all frequency modulated
to
some degree, but most constant.
the frequencies a
436.0 Hz
705.0 Hz
776.0 Hz
805.0 Hz
831.0 Hz
909.0 Hz
993.0 Hz
1187.0 Hz
1227.0 Hz
1274.0 Hz
1348.0 Hz
1772.0 Hz
1816.0 Hz
2000.0 Hz

The 1348 Hz signal was frequency modulated in a slow digital pattern
and also amplitude modulated in a slow digital pattern
which did not correspond to Morse, Baudot, ASCII, or any other pattern
I
could pick off the top of my head. The FM
is 24 Hz shift, from 1361 Hz to 1336 Hz. I didn't take the time to
measure the amplitude excursions, I wanted to get this posted, because

I',m getting kind of tired --hi--...

I made no attempt to make these numbers work out. I eyeballed the
center
freq of each waterfall trace, as well as the edges of the FM
modulation
of the 1348 Hz trace. It was only after I looked at all the numbers
did
I realize that they all were exact freqs, I.E. no decimal frequencies,

and I was extremely suprised to find the exact 25 Hz FM deviation on
the
1348 Hz trace.

Given these results I have reasonably high confidence in my findings,
and that they are correct. I will continue to monitor this freq
tomorrow and see if I can't make some kind of sense out of this. I am

reasonably certain that I am seeing a carrier tonepack, or a telemetry

tonepack. When I first was looking at the traces, One of them (I
forget
which now) seemed to be FM modulated as a time reference, as the
deviation was all one direction (center downward) and at regular
squarewave like intervals. This particular trace ceased the behavior
when I got around to expanding the waterfall (naturally) but I am
determined to track this thing down and get a handle on it. It
doesn't
sound like any 16 channel tonepack with which I am familiar, nor any
telemetry with which I am familiar, (Yup, I've heard ans 'scoped a
lot
of them, most of which I still can't talk about), but heck, this is
the
21st century--hi--

Thanks to this group for a wonderful mystery!! Sometimes you have to
get off the MARS nets, or chasing CW DX all nite, and solve these
things
(if they can be solved). Since I am retired disabled, I have all the
time in the world to pick around at this enigma.

Hr fols my QRZ.com info for those plotting the sig repts:
QSL Mgr: Buro
Coordinates: 39.956267 -75.274357
County: Delaware
Grid: FM29iw
Area Code: 610
GMT Offset: -5
Time Zone: Eastern
Has DST?: Y
==================== End Copied report ==

I fired up my SB-303. At 9:00 PM EST Jan 4, 2005. I copied the
signal S-5. Very readable on a 50 foot piece of wire hanging out
my 2nd floor window.

I can't add anything to the analysis.

de ah6gi/4

On Wed, 5 Jan 2005 06:48:51 UTC, "F8BOE" wrote:

Yo!

Birdies in the IC 746pro!
Try another rig.

73 de F8BOE Olivier ...-.-

I fired up my SB-303. At 9:00 PM EST Jan 4, 2005. I copied the
signal S-5. Very readable on a 50 foot piece of wire hanging out
my 2nd floor window.

I can't add anything to the analysis.

de ah6gi/4


Nope, I heard it on my SB-303. Turned it off and heard it on my
Signal/One CX7A. Dozens of reports from across the US. Different
QTH's, different Hams, different radios.

de ah6gi/4.

Maybe not the right answer, but some thoughts...

28636 kHz is a common clock frequency for some types of CPUs. Maybe you're
picking up the clock oscillator from somebody's nearby old Apple II or
something like that.

It can also be used as a NTSC or H-Synch clock for various TVs, VCRs,
DVDs, etc. Do a quick Google of 28.636 Mhz and you'll get tons of hits,
related both to CPU clocks and video synch signals.

Since it is such a widely used clock frequency, that would explain why it
can be heard
by many listeners widely distributed in the US and elsewhere. The various
"tones" may
be introduced onto the oscillator fundamental by characteristics of the
switching power
supply or other such things.

Another possibility might be some new testing of some balloon-launched
experimental telemetry units. Seems some guys in New England did some tests
early last year. Maybe they or others are doing it again. See info on:
http://frodo.bruderhof.com/hambone/04b.htm
Seems if this was the case, though, they'd opt for some more 'conventional'
mode than a
strangely modulated 14-tone signal. Thus, I'd fall back on my first two
ideas.

Ken, WB0OCV

Don't get excited- its probably the 8th harmonic of yours or your
neighbour's Tv Now what's 8x 3.579Khz= ? Suggested to me by VE3BHW.

Ralph VE3BBM
"No Spam " No wrote in message
news:ifgU75G3LLdo-pn2-XtX4ucNdH3gp@localhost...
This came though a listserv. There's a "mystery" signal on 10
meters. The puzzle is that this signal has been heard across the
country.

==================== Start Copy ==

GE er GM, All.

Hr flws sig rept 28.635Khz,

Time 0508Z (0008R) 4 JAN 2005

Sig recieved on Icom IC-746PRO, equipped with high stability crystal
freq standard, fed from GAP Titan DX vertical.

Sig taken in USB position after verfifying zero beat in CW of
28.635KHz.

Lvl approx S6-7.

I then applied sig to MixW program, expanded waterfall to X5 scale,
and
used CW mode to get a single cursor I could work with. This signal
looks like, or very similar to, a carrier tonepack, or a telemetry
trace
of some sort.

The signal is composed of 14 discrete tones, all frequency modulated
to
some degree, but most constant.
the frequencies a
436.0 Hz
705.0 Hz
776.0 Hz
805.0 Hz
831.0 Hz
909.0 Hz
993.0 Hz
1187.0 Hz
1227.0 Hz
1274.0 Hz
1348.0 Hz
1772.0 Hz
1816.0 Hz
2000.0 Hz

The 1348 Hz signal was frequency modulated in a slow digital pattern
and also amplitude modulated in a slow digital pattern
which did not correspond to Morse, Baudot, ASCII, or any other pattern
I
could pick off the top of my head. The FM
is 24 Hz shift, from 1361 Hz to 1336 Hz. I didn't take the time to
measure the amplitude excursions, I wanted to get this posted, because

I',m getting kind of tired --hi--...

I made no attempt to make these numbers work out. I eyeballed the
center
freq of each waterfall trace, as well as the edges of the FM
modulation
of the 1348 Hz trace. It was only after I looked at all the numbers
did
I realize that they all were exact freqs, I.E. no decimal frequencies,

and I was extremely suprised to find the exact 25 Hz FM deviation on
the
1348 Hz trace.

Given these results I have reasonably high confidence in my findings,
and that they are correct. I will continue to monitor this freq
tomorrow and see if I can't make some kind of sense out of this. I am

reasonably certain that I am seeing a carrier tonepack, or a telemetry

tonepack. When I first was looking at the traces, One of them (I
forget
which now) seemed to be FM modulated as a time reference, as the
deviation was all one direction (center downward) and at regular
squarewave like intervals. This particular trace ceased the behavior
when I got around to expanding the waterfall (naturally) but I am
determined to track this thing down and get a handle on it. It
doesn't
sound like any 16 channel tonepack with which I am familiar, nor any
telemetry with which I am familiar, (Yup, I've heard ans 'scoped a
lot
of them, most of which I still can't talk about), but heck, this is
the
21st century--hi--

Thanks to this group for a wonderful mystery!! Sometimes you have to
get off the MARS nets, or chasing CW DX all nite, and solve these
things
(if they can be solved). Since I am retired disabled, I have all the
time in the world to pick around at this enigma.

Hr fols my QRZ.com info for those plotting the sig repts:
QSL Mgr: Buro
Coordinates: 39.956267 -75.274357
County: Delaware
Grid: FM29iw
Area Code: 610
GMT Offset: -5
Time Zone: Eastern
Has DST?: Y
==================== End Copied report ==

I fired up my SB-303. At 9:00 PM EST Jan 4, 2005. I copied the
signal S-5. Very readable on a 50 foot piece of wire hanging out
my 2nd floor window.

I can't add anything to the analysis.

de ah6gi/4

In article , "quickhatch"
writes:

28636 kHz is a common clock frequency for some types of CPUs. Maybe you're
picking up the clock oscillator from somebody's nearby old Apple II or
something like that.

It can also be used as a NTSC or H-Synch clock for various TVs, VCRs,
DVDs, etc. Do a quick Google of 28.636 Mhz and you'll get tons of hits,
related both to CPU clocks and video synch signals.

Yep. 28.636 MHz is the 8th harmonic of 3.5795+ MHz, the NTSC color TV color
burst subcarrier frequency. Most early home computers (Apple II, Commodore 64,
Tandy Color Computer, Atari) used your TV as the monitor, and so the entire
computer was clocked at some multiple of the 3.58 freq.

Modern Nintendo, Sony, etc. game boxes probably follow the same rule, and since
every neighborhood has a few of these running, it's not surprising that you'd
get reports from all over the country, plus Canada, Latin America and I think
Japan, all using the NTSC system.
73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.