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Author Topic: QRM on 3880  (Read 10152 times)
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W7SOE
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« on: February 24, 2010, 10:30:29 AM »

I have been hearing a loud signal on 3880 for the last few mornings.  It sounds like a constant RTTY signal.  Anyone else on the west coast hearing this or is it local?

Thanks

Rich
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WV Hoopie
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« Reply #1 on: February 24, 2010, 11:22:42 AM »

I don't do mornings. Never hear it when the southern Orygun AM net gets on at 1PM.

Craig,
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W2PFY
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« Reply #2 on: February 24, 2010, 11:55:08 AM »

Yep, we hear it on the east coast and it's been going on for years. I think it has been covered before on elsewhere this board. Perhaps a foreign military signal??

I cannot find the post. Maybe someone else knows where its at?
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W7SOE
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« Reply #3 on: February 24, 2010, 01:51:36 PM »

Yep, we hear it on the east coast and it's been going on for years. I think it has been covered before on elsewhere this board. Perhaps a foreign military signal??

I cannot find the post. Maybe someone else knows where its at?

Really?  Man it is loud.

Rich
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W2PFY
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« Reply #4 on: February 24, 2010, 02:02:37 PM »

I haven't heard it this year so far but it's more annoying than loud. I personally don't like to operate on top of it. I have always heard it in the evening in the winter months. I have never heard it in the summer. I'll listen for it tonight. It also moves around a few kc's, usually in five kc steps.
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WV Hoopie
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« Reply #5 on: February 24, 2010, 02:04:13 PM »

Maybe,

75 meters is almost empty at times here (my QTH). Late mornings, early afternoons the band seems short & weak. This is one reason why the 3880 and 3870 AM Orygun groups get on at those times, no QRM.  But I do know there are several Orygun stations that play with old BA military stuff and these gents have mentioned RTTY.

Rich, I purchased one of my R-390/A's from such a person in Portland, just saying.

Craig,
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w3jn
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« Reply #6 on: February 24, 2010, 11:05:24 PM »

Remember that in other ITU regions 3800-4000 isn't an amateur band.

There's a ton of tee-rash from 3800 on up that I can hear here in Europe in the early AM (10-11PM eastern time) including a mighty strong english numbers station on 3840.

I'd guess that it's something in Asia, or northern Russia you're hearing. 
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Ed/KB1HYS
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« Reply #7 on: February 25, 2010, 07:50:10 AM »

QRN and QRM were bad last night between 10-11pm EST.
I could hear some folks out in the midwest, but they couldn't hear me.

There was a very broad and loud noise around 3860-3875(?) sounded like radar or something? Commercial electronics?  I don't know what it was but it was S9 + here. 

For intentional Jamming there was a pulsed signal (continous Dits) up on 3890.  Oddly enough he wasn't bothering the SSB ops up there too much.

Mother nature was adding her two cents with static crashes coming in pretty strong, almost like summer.  I guess the good times are ending.
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73 de Ed/KB1HYS
Happiness is Hot Tubes, Cold 807's, and warm room filling AM Sound.
 "I've spent three quarters of my life trying to figure out how to do a $50 job for $.50, the rest I spent trying to come up with the $0.50" - D. Gingery
K4TLJ
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« Reply #8 on: February 25, 2010, 08:10:16 AM »

Be glad that you don't live here. My noise level on 80, 40 and 20 generally runs S9 to 20 over. My hammin' consists mostly of fixing and building stuff. On air is very frustrating. Your QRM would not get above my noise level.
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Terry
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Steve - WB3HUZ
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« Reply #9 on: February 25, 2010, 10:13:08 AM »

The stuff on 3865 is commercial out of Europe. You can hear similar signals all through the lower HF frequencies including 1877, 1895, 3830, etc. Ther are many outside the ham bands too.



QRN and QRM were bad last night between 10-11pm EST.
I could hear some folks out in the midwest, but they couldn't hear me.

There was a very broad and loud noise around 3860-3875(?) sounded like radar or something? Commercial electronics?  I don't know what it was but it was S9 + here. 

For intentional Jamming there was a pulsed signal (continous Dits) up on 3890.  Oddly enough he wasn't bothering the SSB ops up there too much.

Mother nature was adding her two cents with static crashes coming in pretty strong, almost like summer.  I guess the good times are ending.
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pe1mph
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pe1mph AM from Holland


« Reply #10 on: February 25, 2010, 12:03:42 PM »

I have been hearing a loud signal on 3880 for the last few mornings.  It sounds like a constant RTTY signal.  Anyone else on the west coast hearing this or is it local?
Thanks
Rich

Yes, often between 3875 and 3880 khz such signal.
The best freq. is 3885 or a little higher....

Greetings,

PE1MPH
Dokkum, The Netherlands
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Ed/KB1HYS
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« Reply #11 on: February 25, 2010, 12:13:18 PM »

The stuff on 3865 is commercial out of Europe. You can hear similar signals all through the lower HF frequencies including 1877, 1895, 3830, etc. Ther are many outside the ham bands too.

Is it a broadcast or ?? DRM?  It does sound just like the junk up over 4mc. which I thought was DRM.
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73 de Ed/KB1HYS
Happiness is Hot Tubes, Cold 807's, and warm room filling AM Sound.
 "I've spent three quarters of my life trying to figure out how to do a $50 job for $.50, the rest I spent trying to come up with the $0.50" - D. Gingery
Steve - WB3HUZ
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« Reply #12 on: February 25, 2010, 12:32:53 PM »

I don't know. I think there is a DRM station around 3995 or so. I'll have to compare.
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flintstone mop
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« Reply #13 on: February 25, 2010, 02:53:41 PM »

Be glad that you don't live here. My noise level on 80, 40 and 20 generally runs S9 to 20 over. My hammin' consists mostly of fixing and building stuff. On air is very frustrating. Your QRM would not get above my noise level.

Terry
You should check around the shack/house/neighborhood for your noise. Unless you have been down this lonely road. Finding QRM is hard, but apparently switching PS's and some HDTV's AND computers are causing a LOT of nasty noises on the lower bands.


Fred
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Fred KC4MOP
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« Reply #14 on: February 25, 2010, 07:07:34 PM »

The Portugeuse Navy in Lisbon has a RTTY broadcast on 3782. I've heard them for years in the evenings with FB signal strength, but all they ever seem to do is repeat a channel marker with message "NAWS NAWS DE CTP CTP QSX 4 6 8 MHZ AR". They are a NATO station.

73, Jim
WA2AJM/3

I have been hearing a loud signal on 3880 for the last few mornings.  It sounds like a constant RTTY signal.  Anyone else on the west coast hearing this or is it local?

Thanks

Rich

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DMOD
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« Reply #15 on: February 25, 2010, 07:41:42 PM »

If it is the Warbulator that was dicussed on a recent thread, I have heard it for the last three days in the midwest here on 20, 40, and 80 m.

I believe it to be military. It slides up and down the band; sometimes it sounds like D-STAR, sometimes a warbulator, sometimes like a broken SSB transmission.

As far as the Nutso jammer is concerned, we believe the jammer is located in Wisconsin since he is very strong in the central part here. A number of hams in Ill, Wisconsin, Minn. and Iowa are trying to pinpoint the freakoid and his QTH.

We are hoping his tower will support his carcass after the trial is over! Shocked

Phil - AC0OB
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K5WLF
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« Reply #16 on: February 26, 2010, 12:49:01 AM »


We are hoping his tower will support his carcass after the trial is over! Shocked

Phil - AC0OB

I think the proper wording there should be: "...after his FAIR trial is over!"  Grin

73<
ldb
K5WLF
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WD8BIL
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« Reply #17 on: February 26, 2010, 10:05:58 AM »

Quote
Quote from: DMOD on Yesterday at 07:41:42 PM

We are hoping his tower will support his carcass after the trial is over!

Phil - AC0OB


I think the proper wording there should be: "...after his FAIR trial is over!" 

73<
ldb
K5WLF


Trial??? We don't need no stinkin' trial!
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K5WLF
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« Reply #18 on: February 26, 2010, 10:18:25 AM »

Quote
Quote from: DMOD on Yesterday at 07:41:42 PM

We are hoping his tower will support his carcass after the trial is over!

Phil - AC0OB


I think the proper wording there should be: "...after his FAIR trial is over!" 

73<
ldb
K5WLF


Trial??? We don't need no stinkin' trial!

That was a reference (evidently too subtle) back to the old joke about "Do you want to be hanged before or after your fair trial?"

73,
ldb
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Steve - WB3HUZ
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« Reply #19 on: March 01, 2010, 09:26:11 PM »

The stuff on 3865 and 3858 kHz is not DRM. The bandwidth of those two is only 3 kHz. DRM is much wider. Also check out the audio clips below. The DRM on 3965 kHz sounds completely different. The DRM is very much like white noise, while the signal on 3865 kHz has a definite pattern.



The stuff on 3865 is commercial out of Europe. You can hear similar signals all through the lower HF frequencies including 1877, 1895, 3830, etc. Ther are many outside the ham bands too.

Is it a broadcast or ?? DRM?  It does sound just like the junk up over 4mc. which I thought was DRM.

* datatx27feb1003583865.mp3 (110.26 KB - downloaded 382 times.)
* 80meterdrm27feb100400z3965.mp3 (102.16 KB - downloaded 397 times.)
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W3RSW
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Rick & "Roosevelt"


« Reply #20 on: March 02, 2010, 03:00:06 PM »

The first one sounds like some sort of fax without a local oscillator.  Was it recorded in AM mode?

Anyway, nothing except the recent modulated wabulator can come close to what I heard on 3870 Sat. or Sun night.  I mean it got rough; AM guys (you know who you are) were calling each other everything in the book.   They'll be enemies for life until they quaff a few at the next fester together.  Grin
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RICK  *W3RSW*
Steve - WB3HUZ
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« Reply #21 on: March 02, 2010, 10:15:54 PM »

The recordings were made in the AM mode. The signal on 3865 kHz sounds like this with LSB detection.

* datatxssbdet27feb1003583865.mp3 (119.91 KB - downloaded 391 times.)
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W3RSW
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Rick & "Roosevelt"


« Reply #22 on: March 03, 2010, 01:38:23 PM »

Yeah, that sounds like old SW press transmissions in the day.  I think I can even hear sync tones every 1/4 sec. or so.

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RICK  *W3RSW*
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« Reply #23 on: March 03, 2010, 01:55:20 PM »

It also resembles the digital SSTV signal from EZpal, although the spectrum seems to have more tilt, at least looking at the rendition under window media player. Take a listen on 3713 or 7173 and compare. I'm pretty sure I heard some jamming a bit further up the spectrum with the digital sstv a week or so back. The signal has 6 or 8 subcarriers across a voice width passband, all doing FSK at once and does a pretty good job of filling the channel wall to wall. Might be we're hearing it down in the window from time to time too - that day it seemed to be moving around some.
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73 de Kevin, WB2EMS
Steve - WB3HUZ
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« Reply #24 on: March 03, 2010, 02:41:24 PM »

I'm pretty sure the ones on 3858 and 65 kHz are not jammers. They are legitimate transmissions out of Europe. I hear similar signals at various other places in the lower HF range including 1877 and 1895/97 kHz on 160 meters. All of these are coming from Northeast of my location and based on the signal strength and fading, seem like Europe.
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