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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › My frequency checker
09-06-2006 03:06 AM  14 years ago
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airplanebuilder

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My frequency checker
acts really weird around my PC. It seems that our computer equipment is putting out 72 MHZ@! I included a picture of the RF noise or signals?? You might want to try it yourself. I wonder if it's blue toothed or something. crazy..

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09-06-2006 03:36 AM  14 years ago
Brett

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Chicago Burbs

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Its called Part 300
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09-06-2006 03:51 AM  14 years ago
dkshema

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Cedar Rapids, IA

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PCs generate a LOT of RF noise. It's their job.

Dave
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09-06-2006 08:37 AM  14 years ago
9387ASH

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Dave, how do you work that one out ???

(btw I am a qualified TEMPEST Engineer )
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09-06-2006 08:51 AM  14 years ago
JamesonMalpezzi

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lll

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--
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09-06-2006 12:58 PM  14 years ago
dkshema

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PCs aren't designed anywhere near TEMPEST requirements. With clocks running at or near 2 - 3 GHz, with a lot of sub-frequencies for the various busses and other goodies inside, coupled with very high-speed edges on internal signals, these things are noisy. Then, hook up printers, monitors, scanners, and a host of other microprocessors and microcontroller-based peripherals, you have a real thick soup of Radio Frequency and Electrmagnetic interference generators. Throw in a lot of lengthy cables scattered around to act as radiators.

Sure, there are emissions standards that consumer electronics need to conform to, but those standards allow the stuff to be pretty noisy.

There's a fairly new credit union close to my house that regularly obliterates AM radio when you drive by it. It has to be one of the noisiest buildings I've ever seen.

Even when I drive up to my house, with both PCs running, a couple of printers hooked up, and an ethernet router/switch/WAP -- the AM radio in my van gets real noisy when listening to a station whose tower is located something like 50 miles away. Lots of RF noise for everyone coming out of that room in my house.

As for that scanner going nuts next to these RF generators, I'd suspect that the scanner front end has been designed to work with field strengths at the level of microvolts per meter (after all, its a radio receiver designed to monitor transmitters outputting less than a watt at distances of 1000 - 1500 feet. The emissions out of a PC most likely are at least a few orders of magnitude higher than a few microvolts/meter.

Dave
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09-06-2006 01:37 PM  14 years ago
9387ASH

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Yep, but was curious as to why you stated "It's their job"

Oh and you can get "quiet" PC's totally shielded but they are costly devices !!

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09-06-2006 01:46 PM  14 years ago
Bad Karma

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Weird, I have the same scanner, only on 35MHz and I get nothing from my PC, perhaps the EMI is not so much a bowl of soup but a cuppa soup..... not quite as filling
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09-06-2006 02:04 PM  14 years ago
9387ASH

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One thing I have noticed is that the European spec machines are usually quieter. Monitors were usually the main culprits but when the MPRII standard came into being, I noticed that the noise reduced.

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09-06-2006 05:17 PM  14 years ago
Tmblewd

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When I'm on the computer and my cell phone rings, I start hearing static from my computer before my phone starts ringing. Anyonew else have this happen to them?
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09-06-2006 06:08 PM  14 years ago
arceye

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Tmblewd

That same kind of interference has been accused of shooting down models or causing lockouts if the pilot has a mobile in thier chest pocket while flying with the transmitter on a neckstrap. How much of it is true I have no idea but I would not take the chance of having my mobile phone in any of my pockets while flying.

Mac_Man those shielded pc's you are refering to I am guessing are used by the military in thier copper lined building they use for secret meetings, I have installed satellite systems in 1 of those buildings and had to screen the entire length of cable from dish to receiver so no interested nosey people could have any way of hearing the secret military conversations about how they take thier coffee and what they had for breakfast.


Andy

Kasama Head :(
The Blingiest DOWNGRADE a Raptor can have
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09-06-2006 06:56 PM  14 years ago
matman

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Just fly on ,13,14,16,24,25,35,42,44,50,52,53,55,or59 and you should be ok. LOL "Respect my Authoritiah!"
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09-06-2006 07:08 PM  14 years ago
JR_Vibefreak

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Bangkok Thailand & UAE Dubai

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Might be a Ghost maybe?
I thing it is affected by magnetic,radiation,RF field that you place your frequency checker near the device I think>?
ohh you can make a picture out of that checker lol
GIXXER4LIFE Philipp
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09-06-2006 10:06 PM  14 years ago
matman

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Just fly on ,13,14,16,24,25,35,42,44,50,52,53,55,or59 and you should be ok. LOL
I feel like all of the others would be auto pilot.
"Respect my Authoritiah!"
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09-06-2006 10:15 PM  14 years ago
bwarkent

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Houston Tx

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Is there a technical basis for the frequencies listed?
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09-06-2006 10:30 PM  14 years ago
R/C Speed Nut

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Galesburg, Michigan USA

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Is there a technical basis for the frequencies listed?
Look at the picture in the first post. Those are the channels with no interference.

Mike

Funky Chicken?!!..........I thought this was how you do a piro flip!!
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09-06-2006 11:12 PM  14 years ago
matman

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Is there a technical basis for the frequencies listed?
Yea... I was just being facisious I dont think I would fly anything anywhere near that environment.
"Respect my Authoritiah!"
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09-06-2006 11:39 PM  14 years ago
dkshema

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Cedar Rapids, IA

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It's their job
A bit of wry humor that apparently missed the mark!

Dave
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09-07-2006 12:00 AM  14 years ago
Tmblewd

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Phoenix, AZ

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arceye - Good information to know. I have flown as you described, transmitter around my neck and cell phone in my pocket and haven't had an issue. YET. I did just change to a syntheisized mudule, but haven't flown with it.
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09-07-2006 01:09 AM  14 years ago
heli-cuzz

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Pittston, Pa. USA

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I just tried my frequency checker next to my comp. No rf's here.Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90
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