Horrible signal on 10130

[N7US]

Is anyone else with a P3 hearing and seeing the signal now (04Z 20 Sep) on
10130?  It's audible and has the strangest display on the P3 from 10113 to
10137.

 

Jim N7US

 

 

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[Matt Zilmer]

Nothing like that heard in SoCal.  No P3 display showing like that
either.

matt W6NIA

On Mon, 19 Sep 2011 23:04:20 -0500, you wrote:

>Is anyone else with a P3 hearing and seeing the signal now (04Z 20 Sep) on
>10130?  It's audible and has the strangest display on the P3 from 10113 to
>10137.
>
>
>
>Jim N7US
>
>
>
>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
>This list hosted by: http://www.qsl.net
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[Bob Cunnings NW8L]

I've been hearing (and seeing on the P3) an 850 Hz shift RTTY signal
on 10.130 MHz for years now, virtually every evening.  I use it as a
propagation indicator on 30m, when it's strong I can work into the
eastern US from here (NM) easily. I've read that it is an encrypted
transmission of the US Navy, possibly from the Cutler ME NCS.

I see that it turns up on this list:

http://ik4hdq.net/doc/10to30MHz.htm

But this signal I observe has an occupied BW of no more than 4 kHz.
It's certainly not spread out over a 14 kHz bandwidth you indicate.
Maybe you are seeing something else? Does it look like wide shift
RTTY?

Bob NW8L

>Is anyone else with a P3 hearing and seeing the signal now (04Z 20 Sep) on
>10130?  It's audible and has the strangest display on the P3 from 10113 to
>10137.
>
>
>
>Jim N7US
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[k6dgw]

It's been there, 24/7 it seems, since we first got 30m.  I think it's
one of the primary users we are supposed to avoid QRM to.  850 Hz shift,
decodes just fine in MixW and MMTTY to continuous random characters
which would be characteristic of most of the not-so-new TTY encryption
devices.  It's pretty strong daytime here on the western frontier.  It's
at most, about 2 KHz wide, which would be about right for 850 Hz shift
RTTY.  I haven't heard anything else around it, but I'll listen around
0400Z tonight.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2011 Cal QSO Party 1-2 Oct 2011
- www.cqp.org

On 9/19/2011 10:00 PM, Bob Cunnings wrote:
> I've been hearing (and seeing on the P3) an 850 Hz shift RTTY signal
> on 10.130 MHz for years now, virtually every evening.  I use it as a
> propagation indicator on 30m, when it's strong I can work into the
> eastern US from here (NM) easily. I've read that it is an encrypted
> transmission of the US Navy, possibly from the Cutler ME NCS.
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[N7US]

Last night is the first time that I've heard it so wide.  If I hear it
again, I'll save a screenshot with the P3 Utility.

Jim N7US



-----Original Message-----


It's been there, 24/7 it seems, since we first got 30m.  I think it's
one of the primary users we are supposed to avoid QRM to.  850 Hz shift,
decodes just fine in MixW and MMTTY to continuous random characters
which would be characteristic of most of the not-so-new TTY encryption
devices.  It's pretty strong daytime here on the western frontier.  It's
at most, about 2 KHz wide, which would be about right for 850 Hz shift
RTTY.  I haven't heard anything else around it, but I'll listen around
0400Z tonight.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2011 Cal QSO Party 1-2 Oct 2011
- www.cqp.org

On 9/19/2011 10:00 PM, Bob Cunnings wrote:
> I've been hearing (and seeing on the P3) an 850 Hz shift RTTY signal
> on 10.130 MHz for years now, virtually every evening.  I use it as a
> propagation indicator on 30m, when it's strong I can work into the
> eastern US from here (NM) easily. I've read that it is an encrypted
> transmission of the US Navy, possibly from the Cutler ME NCS.

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[Jim Brown-10]

Most "horrible wide signals" observed on the P3 are produced by
electronic sources like switching power supplies (including battery
chargers) and the clocks associated with various digital devices. Some
may be in your own home, others in the homes of neighbors. They
typically show up as a typical bell-shaped curve peaking at some
frequency, and other similar peaks spaced anywhere from 10 kHz to 50 kHz
apart.  The 33V DC power supply that SteppIR sold me for their
controller is REAL NASTY, especially on the higher HF bands.  I had to
replace it with a home brew linear supply so that I could work on those
bands.

73, Jim K9YC
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