SETI on shortwave...

Message boards : SETI@home Science : SETI on shortwave...

Author	Message
Dave Send message Joined: 29 Mar 02 Posts: 774 Credit: 23,193,139 RAC: 0	Message 952072 - Posted: 3 Dec 2009, 20:48:16 UTC
	Hmm here's an experiment... Playing with basic SW radio as I'm in a metal-framed building so normal stations are hard to come by. Ok no problem, I can try to explore what I can i.e what electrical noise there is. Near the SETI farm I'm noticing non-natural noises, & can confirm whether these are related to machines @ 100% or not via snoozing/resuming computation & seeing how the sound over the radio changes. Laptop indeed singled out around 2.29MHz with a nice wooooooooooooop-fx as I resume :D!!! Lpatop off so that's out the equation now, trying to find the other machines... (Anyone know what freq an Athlon64 X2 transmits its RF noise on? ;))
	ID: 952072 ·

Dave Send message Joined: 29 Mar 02 Posts: 774 Credit: 23,193,139 RAC: 0	Message 952075 - Posted: 3 Dec 2009, 20:52:32 UTC - in response to Message 952072.
	(Make that 15.41MHz...)
	ID: 952075 ·

Johnney Guinness Volunteer tester Send message Joined: 11 Sep 06 Posts: 2944 Credit: 2,305,966 RAC: 330	Message 952505 - Posted: 5 Dec 2009, 0:11:09 UTC Last modified: 5 Dec 2009, 0:18:07 UTC
	Dave, If your hearing something on a short wave radio near your computer, its nothing to do with whether SETI@home work units are running on the machine. SETI@home work units will not be transmitting anything inside your PC. Maybe your hearing some general static, something related to the electronics in the PC. But its very unlikely unless you have modified your PC or added hand-made hardware. Most computer manufacturers go to great lengths to shield the EM radiation in your PC. Computer processor chips don't emit any RF noise! Also the metal box surrounding your PC is grounded to Earth to prevent RF noise. Your could point the Arecibo radio dish at your PC and it wouldn't hear a thing. John. ____________
	ID: 952505 ·

Gary Charpentier Volunteer tester Send message Joined: 25 Dec 00 Posts: 10317 Credit: 5,080,740 RAC: 5,985	Message 952532 - Posted: 5 Dec 2009, 1:07:49 UTC - in response to Message 952505.
	Dave, If your hearing something on a short wave radio near your computer, its nothing to do with whether SETI@home work units are running on the machine. SETI@home work units will not be transmitting anything inside your PC. Maybe your hearing some general static, something related to the electronics in the PC. But its very unlikely unless you have modified your PC or added hand-made hardware. Most computer manufacturers go to great lengths to shield the EM radiation in your PC. Computer processor chips don't emit any RF noise! Also the metal box surrounding your PC is grounded to Earth to prevent RF noise. Your could point the Arecibo radio dish at your PC and it wouldn't hear a thing. John. Sadly not true. Computers are one of the worst sources of radio frequency interference. That is why governments demand they be shielded. As CPU speeds have picked up they have shifted from shortwave into microwaves, but they radiate across the entire spectrum. The nasty deed made all the worse because they switch using square waves not sine waves. Square waves toss harmonics like mad. ____________
	ID: 952532 ·

Dave Send message Joined: 29 Mar 02 Posts: 774 Credit: 23,193,139 RAC: 0	Message 952669 - Posted: 5 Dec 2009, 13:18:39 UTC
	It's just interesting fx, & definitely linked to the client/CPU due to the sonic effects of the CPU revving up & down :). I'm not trying to claim to have found anything to change the destiny of humanity... The noise is most discoverable from the laptop. Also an old non-PC machine chucks noise all over the place. Both these machines visibly lack the internal metal shielding that the Dells have quite clearily in abundance.
	ID: 952669 ·

tullio Send message Joined: 9 Apr 04 Posts: 2896 Credit: 259,140 RAC: 300	Message 952670 - Posted: 5 Dec 2009, 13:26:22 UTC
	I have a radio near my computer. When using AM I hear a noise which is stronger in summer when the computer fans speed up than in winter. But FM is not disturbed in any way. My CPU has a 1.8 GHz frequency. Tullio ____________
	ID: 952670 ·

junicks Send message Joined: 3 Dec 09 Posts: 4 Credit: 8,728 RAC: 0	Message 953065 - Posted: 7 Dec 2009, 21:57:08 UTC
	as an more or less experienced numbers stations-hunter (secret sw-transmissions) i can confirm, that computers made noise too. especially it's not the computer "itself"; take a laptop, plug it to your radio, listen to it and THEN unplug the power cable of your laptop and voila - silence! (using the sangean ats 909 with an macbook pro)
	ID: 953065 ·

Dave Send message Joined: 29 Mar 02 Posts: 774 Credit: 23,193,139 RAC: 0	Message 953246 - Posted: 8 Dec 2009, 22:25:10 UTC
	How are you plugging the laptop into the radio?
	ID: 953246 ·

junicks Send message Joined: 3 Dec 09 Posts: 4 Credit: 8,728 RAC: 0	Message 953334 - Posted: 9 Dec 2009, 8:11:51 UTC - in response to Message 953246.
	with an two-way-cable like this one http://piraten.in/4hd - just plug it into audio-in on your book and the audio-out of your radio :)
	ID: 953334 ·

Message boards : SETI@home Science : SETI on shortwave...