Re: [RCSE] potential frequency problems
Big rigs are known to regularly use 100+ watt linears to Boost their 27 Mh CBs (snip) (Wayne Walker) Doing this is illegal, although this won't stop people from using these power amplifiers because they know they're unlikely to be caught (this sort of thing isn't very high on the FCC's enforcement priorities). Legalities aside, the problem with that kind of setup is that the burner is likely to be imperfect so they'll be generating appreciable amounts of out-of-band energy and they're unlikely to have adequate filtering on the antenna side to supress it. The whole setup won't be very efficient -- that's why those users feel they need an amplifier in the first place, they'll want the maximum and they won't be sophisticated or responsible enough to ask themselves where all that extra energy's going to. Radio amateurs are interested in finding illegal transmitters because they're concerned that rouge users will unfairly tarnish their imagemaybe contacting them and asking for help would be useful. Martin Usher RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] potential frequency problems
While we're on the subject of radio interference from high-powered electrical devices, I have a related question. We have two horses. Both of them are BIG (one Clydesdale, one Belgian-Clydesdale). Savannah, our Belgian-Clydesdale (she looks similar to Big John in the Tim Allen - Kirstie Alley movie For Richer or for Poorer) is extremely intelligent, as is typical of draft breeds. A little TOO intelligent. In the winter when the grass is scarce, she's quite adept at finding the weak spots in any fence. She walks down mesh fence, figures out how to defeat barbed wire, and can go under a chest-high hi-tensile wire, or even between two hi-tensile wires (one higher and one lower). She's bigger and stronger than a Volkswagen, and extremely clever and resourceful, better in that category than most dogs I've worked with. In the interest of keeping her from wandering the neighborhood roads in the wee hours of some icy winter morning, I'm getting ready to install our last resort, an electric fence (pretty powerful one too, strong enough to stop a really big horse). However, I fly quite a bit in the back yard and in the pastures, around, across and over where the electric fence will be, with all sorts of radios including some ultra-micro single conversion radios. Does anyone have any actual experience with flying in close proximity to an electric fence? What sort of interference can I expect from it, and if there are problems, are there any solutions short of turning it off while I'm flying? Savannah is smart enough to figure out if the sight of one of my toys overhead means the fence is shut down. Don Stackhouse @ DJ Aerotech [EMAIL PROTECTED] http://www.djaerotech.com RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] potential frequency problems
Pagers do use the frequencies in between our frequencies. About all you can do is monitor them and complain if they are off-frequency. My local field had one that was a little off-frequency for a while. It would cause problems. A real pain to figure out since they don't always transmit. You just get hit from time to time. Wayne Walker wrote: I was recently hit with a CB rig on Ch 30. I was too close to a big rig and apparently got swamped by him. Big rigs are known to regularly use 100+ watt linears to Boost their 27 Mh CBs' Our field in San Diego ran several tests and found that pagers on ch 28-29, 23-24, 11-12, 50-51, 54-55. See below for more info. SkyWalker http://www.sefsd.org/club_info/frequency.htm RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
Re: [RCSE] potential frequency problems
At 09:18 PM 6/23/2003 -0400, Don Stackhouse @ DJ Aerotech wrote: Does anyone have any actual experience with flying in close proximity to an electric fence? What sort of interference can I expect from it, and if there are problems, are there any solutions short of turning it off while I'm flying? Savannah is smart enough to figure out if the sight of one of my toys overhead means the fence is shut down. Not exactly the same thing, but I've flown next to or close to high tension wires many times. I've wondered about doing that but I've never had any problems I would call interference of any sort. Bill -- In theory, there is no difference between theory and practice, but in practice there is. Bill Johns Pullman, WA USA RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
RE: [RCSE] potential frequency problems
I was recently hit with a CB rig on Ch 30. I was too close to a big rig and apparently got swamped by him. Big rigs are known to regularly use 100+ watt linears to Boost their 27 Mh CBs' Our field in San Diego ran several tests and found that pagers on ch 28-29, 23-24, 11-12, 50-51, 54-55. See below for more info. SkyWalker http://www.sefsd.org/club_info/frequency.htm -Original Message-From: Steve Gibson [mailto:[EMAIL PROTECTED]Sent: Sunday, June 22, 2003 3:06 PMTo: rc Soaring ExchangeSubject: [RCSE] potential frequency problems Of the approved airborne frequencies, are there any channels whereinterference with other transmitting devises may be a problem? For instance, I have heard that CB radios can cause a problem on some of the lower R/C channels. Is this true ? Thanks, Steve G
