| Author |
Message |
    
Revpo
Junior Member
Username: Revpo
Post Number: 42
Registered: 7-2006
| | Posted on Tuesday, September 19, 2006 - 5:51 pm: | 
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I have a digital sound on chnl 30 all the time and at night it gets louder any suggestion on how to block it out or eliminate it?
revpo |
Mayor513
Intermediate Member
Username: Mayor513
Post Number: 147
Registered: 3-2002
| | Posted on Tuesday, September 19, 2006 - 5:59 pm: |
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--I am thinking that some brand of cordless mouse uses some frequency somewhere in the 27Mhz range. It sort of had this weird digital sound. If you have a cordless mouse, unplug it and see if it goes away. Other than checking various electronic devices in your home and seeing if that is the noise culprit, about the only way to get rid of a stray signal is using the squelch/rf gain knob (or do some triangulation of the signal, haha). It would be interesting to find out what that noise is, though. Good luck. |
Bruce
Senior Member
Username: Bruce
Post Number: 4059
Registered: 9-2003
| | Posted on Wednesday, September 20, 2006 - 6:08 am: |
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YEP my cordless mouse drives my grant NUTS ....... |
Chad
Senior Member
Username: Chad
Post Number: 1096
Registered: 11-2004
| | Posted on Wednesday, September 20, 2006 - 9:11 am: |
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Cordless mouse.... Never had the intention of using my mouse anywhere else but in front of the computer 
Chad |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2091
Registered: 9-2004
| | Posted on Wednesday, September 20, 2006 - 11:09 pm: |
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yup, check everything in your house that is electronic and very convenient to use. LOL
wireless anything, monitors, touchlamps, etc. can be culprits.
could be a neighbor with a cordless mouse.
i used to have this problem, and i was pretty sure that it was a neighbors cordless mouse that was doing it. every time i heard the interference, i turned on the big tube box, and keyed down on the channel for a good half hour, on and off.
my logic was that if the device could transmit the signal, that it could also receive it, and that it would most likely go freakin' nuts when my amp was keyed.
well, i dont know if it was me or not, but the noise stopped after a week. i think the guy returned it as defective.LOL
another source of noise around here was the outback steakhouse's pagers for guests. they stopped using them too. i wonder why...?LOL
if you have a field strength meter, you can walk around the neighborhood trying to pinpoint the direction of the noise. thats how i found the outback.
good luck,
matt |
Tech237
Moderator
Username: Tech237
Post Number: 532
Registered: 4-2004
| | Posted on Thursday, September 21, 2006 - 8:41 am: |
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By the way - if it is a cordless mouse it is probably a Part 15 device. You know cannot interfere but must accept all inteference to it. Explain to its user as most have the ability to have the frequency they are using changed. |
Sodapop
Intermediate Member
Username: Sodapop
Post Number: 490
Registered: 12-2001
| | Posted on Thursday, September 21, 2006 - 10:17 am: |
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I have a nice noise on 27.6000. Turns out my wireless router is the cause. I don't talk there, so no biggy. But it's funny what can make noise on the 11 meter band! |
Coyote
Advanced Member
Username: Coyote
Post Number: 891
Registered: 11-2004
| | Posted on Friday, September 22, 2006 - 8:51 am: |
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I had a computer upstairs that would always interfere between channels 12 and 16. It was something internal in the computer, never did figure out what. It would even interfere with my mobile in driveway. That computer is dead now and I'm finally noise free on 27.115 for net times.
now if mother nature would cooperate and give me some conditions...... |
Bruce
Senior Member
Username: Bruce
Post Number: 4069
Registered: 9-2003
| | Posted on Friday, September 22, 2006 - 9:38 am: |
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I have a Logitech wireless mouse it drives the grant on ch 13 NUTS ........ |
Moderator1516
Moderator
Username: Moderator1516
Post Number: 327
Registered: 8-2005
| | Posted on Friday, September 22, 2006 - 10:07 am: |
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until recently at a certain time on channel 4 i would have a loud noise ,like some one had turned an appliance on .havent heard it in quite a whiledont know why it quit or what it was
moderator1516 |
Hotwire
Senior Member
Username: Hotwire
Post Number: 1796
Registered: 1-2005
| | Posted on Tuesday, September 26, 2006 - 11:17 am: |
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I did some research. If your radio is next to the computer it may need to be moved. Do you have any logitech brand devices? The logitech wireless mouse and wireless keyboard both operate on the A channels of the cb band. Also a device called a USB dongle ( whatever it may be ) in computer systems operates in the same areas of 27mhz.
After more exstensive research I found some companies who sale these remote control transmitters and recievers. Some transmit up to 3 miles! See they are designed to be used for a varity of applications. On the farm, gates, water pumps,water level alarms ect. Anywhere really, garage doors, lighting, personal alarm systems ( remember the old lady on tv? " help! I've fallen and I can't get up!") The list goes on and on. The transmitters are simple and fit in your pocket. Most are I believe to be transcievers to alert the consumer of whatever his alarm is watching. Some are of multiple channels.
Do a google search and type in "27mhz devices". Just amazing what we are sharing our 11 meters with!
Good luck tracking the problem and if I have anything else to add you will hear from me.
Oh yeah! One more thing about QRN or really its QRM! Ever heard channel 23 on those good propagation days? A dit dit dit dit (pause) dat dat dat dat. The dit dats are in about 1 second bursts. After many many searches I discovered that cb channel 23 is a shared freqeuncy with those car alarms that alert a pager you wear to inform you that your car alarm is going off. They are good for about a mile I believe so maybe a watt or less transmit power? It really made since to me! An HF signal only needs a little to travel everywhere via skywaves! All the other sources I found like internet over power lines, medical devices, phone and internet companies cable companys ect ect is actually what we call QRN interference! But the pagers, well that is QRM right there! We totally have to put up with it and they don't ask for breaks or QSK! Just butt right in......how rude of those devices!
OK now the coffee is doing its job really well and I'm getting a little funny so gotta go! Talk to ya later Revpo buddy! To you and all the fellas at Copper.......Keep your ears on the roger beeps off and the echo down LOW!
Kenny
CEF491
Indiana |
Captian_radio
Member
Username: Captian_radio
Post Number: 50
Registered: 9-2004
| | Posted on Tuesday, September 26, 2006 - 12:41 pm: |
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I dont know if anyone has ever heard this before but it is morse code on 11 and 10 meters and as you described is heard mostly when we have some skip condx,I did some research a few years ago on this and it was found to be drift net beacons , very low power transmitters placed on drift nets in the atlantic for fishing, these beacons are used as a locating device by trawlers etc,they were supposed to be done away with years ago but obviously this hasnt been done.When i hear these beacons i usually have condx to Europe.
Bob CEF451 |
Hotwire
Senior Member
Username: Hotwire
Post Number: 1806
Registered: 1-2005
| | Posted on Wednesday, September 27, 2006 - 12:47 pm: |
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No sir I have never heard of that one. So you say it is actually morse code? Has it happened recently and have you had any luck deciphering it? Interesting. I feel a google search coming on soon.
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Captian_radio
Member
Username: Captian_radio
Post Number: 51
Registered: 9-2004
| | Posted on Saturday, October 07, 2006 - 9:11 am: |
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Well these beacons that i hear are usually during the f2 cycle and during the summer e skip also, deciphering is no problem if you can copy morse code, they are sent at about 3 to 5 words a min very slow,
I have heard these beacons for years as i said very slow cw and all over the band on 10 and 11 meters.
Bob CEF451 |
