[RCSE] 2.4 Question
-Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that a home or structure or earth topology will block much of a 2.4 signal? Bill Swingle Janesville, CA 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. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
[RCSE] 2.4 Question --- line of sight answered
Pretty much a rhetorical question considering that 2.4 for RC has been operating in all disciplines for soaring and ground applications. On a comparison to 72mhz or some of the other Freqs like 900mhz, 2.4 has a bit less ability to reach around objects. Spektrum handled that 'bit' of lesser ability buy using the multiple RX system which sets up sort of a signal net or back stop to capture wayward or deflected signal information. Different than the single RX installs we became used to but easily manageable. Kind of like when you got your first foamy and the instructions said to apply packing tape, like the rest of us because it was a different form of construction from what we had been doing, it sat on the bench for a few days till we wrapped our heads around the system... The same as 72mhz systems, 2.4 doesn't work well without some help in carbon/kevlar compartments...so with 72mhz we extended antennas so that the TX had 'line of sight' with the antenna, so that the Rx could get the information sent. And then there is the obvious point to be made about the question of a home or structure or earth topology blocking the 'line of sight' of the TX to the RX... Unless you have my Zenni Optical $19 distance optimized prescription sun glasses, likely your own eyes won't have 'line of sight' to guide your thumbs anyway. 2.4 is kind of an old topic already ;-). But a good question in any case! Gordy Next stop Auburn Alabama...to check on my competition horse..and oh yeah my daughter in Vet school down there ;-). In a message dated 3/21/2008 1:37:44 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes: -Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that will block much of a 2.4 signal? Bill Swingle Janesville, CA 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. Email sent from web based email such as Hotmail and AOL are generally NOT in text format **Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom000301)
Re: [RCSE] 2.4 Question
Bill, Yes, line of sight but, if your behind a home or structure or earth topology you have larger problems going on even with 72mhz. sj - Original Message - From: Bill Swinglemailto:[EMAIL PROTECTED] To: Soaring@airage.commailto:Soaring@airage.com Sent: Friday, March 21, 2008 9:37 AM Subject: [RCSE] 2.4 Question -Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that a home or structure or earth topology will block much of a 2.4 signal? Bill Swingle Janesville, CA RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]mailto:[EMAIL PROTECTED]. Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
Re: [RCSE] 2.4 Question --- line of sight answered
Good answer. I always wondered about the line of site trees question. If your plane is out of your site you have other problems to solve. On Fri, Mar 21, 2008 at 2:54 PM, [EMAIL PROTECTED] wrote: Pretty much a rhetorical question considering that 2.4 for RC has been operating in all disciplines for soaring and ground applications. On a comparison to 72mhz or some of the other Freqs like 900mhz, 2.4 has a bit less ability to reach around objects. Spektrum handled that 'bit' of lesser ability buy using the multiple RX system which sets up sort of a signal net or back stop to capture wayward or deflected signal information. Different than the single RX installs we became used to but easily manageable. Kind of like when you got your first foamy and the instructions said to apply packing tape, like the rest of us because it was a different form of construction from what we had been doing, it sat on the bench for a few days till we wrapped our heads around the system... The same as 72mhz systems, 2.4 doesn't work well without some help in carbon/kevlar compartments...so with 72mhz we extended antennas so that the TX had 'line of sight' with the antenna, so that the Rx could get the information sent. And then there is the obvious point to be made about the question of *a home or structure or earth topology *blocking the 'line of sight' of the TX to the RX... Unless you have my Zenni Optical $19 distance optimized prescription sun glasses, likely your own eyes won't have 'line of sight' to guide your thumbs anyway. 2.4 is kind of an old topic already ;-). But a good question in any case! Gordy Next stop Auburn Alabama...to check on my competition horse..and oh yeah my daughter in Vet school down there ;-). In a message dated 3/21/2008 1:37:44 P.M. Eastern Daylight Time, [EMAIL PROTECTED] writes: -Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that will block much of a 2.4 signal? Bill Swingle Janesville, CA 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. Email sent from web based email such as Hotmail and AOL are generally NOT in text format -- Create a Home Theater Like the Pros. Watch the video on AOL Homehttp://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom000301 .
Re: [RCSE] 2.4 Question - personal experience.
In a message dated 3/21/08 9:37:44 AM Pacific Standard Time, [EMAIL PROTECTED] writes: Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that a home or structure or earth topology will block much of a 2.4 signal? Bill 2.4 Ghz IS line of sight, just like 72 Mhz. However the shorter wavelength of 2.4 does not penetrate as well as the longer wave lengh of 72. Also there is less chance for blocking the 72 Mhz signal because the transmitter antenna is long and some portion is always looking at the model. Having said that, the 2.4 system will work at the limits of visibility (even DP's) as long as it has a clear shot. I tested my DX7/AR7000 (one satellite) in my house on the theory that it would work wherever the 2.4 router signal worked. I was basically correct although I had only a rudimentary method of testing the router. The signal easily penetrated through three stories of house and down the street about 500 feet with only a few fades, no packet drops and no holds. However, on a range test at 100 feet with the test button depressed, signal will be lost if you turn your back (place your body between the transmitter and model). You will also probably loose signal in flight if another person stands between you and your model. You will certainly loose signal if there is any metal object between you and your model. Looking again at the 2.4 router example, the router signal will not penetrate filing cabinets or other metal objects. The Supra installation in the 2.4 friendly pod is perfect. Hundreds of flights with no problems and now with the data capable AR7000, I can collect real numbers not just my impressions. In the several flights since data collection began, the most fades on any antenna has been 250 (10 minute flight), no lost packets and no holds. I lost a Twin Star today when the system locked out and did not reboot (reacquire) before the altitude was gone. It was using a single AR6100 and had flown for several hours on previous occasions. The model was 700 feet upwind at about 200 feet when the incident occurred. Following impact, the system worked fine as it had time to reboot. The 6100 will be replaced with an AR6200 and a satellite receiver. Bottom line - 2.4 Ghz works but requires some thought about receiver installation and transmitter location during flight. It is not as forgiving as 72Mhz, but for me, provides much more security in the crowded, uncontrolled flying sites that I frequently visit. Now can I feel the difference? I have only been using the system about a year, so maybe next year I can answer the question. Don Richmond San Diego, CA [EMAIL PROTECTED] www.hilaunch.com **Create a Home Theater Like the Pros. Watch the video on AOL Home. (http://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom000301)
Re: [RCSE] 2.4 Question - personal experience.
Don, which version of the 6100 were you using. ver 1.6 will reboot much faster you can send it in to horizon and they will reflash it for free... Jay On Fri, Mar 21, 2008 at 8:42 PM, [EMAIL PROTECTED] wrote: In a message dated 3/21/08 9:37:44 AM Pacific Standard Time, [EMAIL PROTECTED] writes: Isn't 2.4Ghz very much line of sight? -And poor at penetrating obsticles? Thus, isn't it reasonable to say that a home or structure or earth topology will block much of a 2.4 signal? Bill 2.4 Ghz IS line of sight, just like 72 Mhz. However the shorter wavelength of 2.4 does not penetrate as well as the longer wave lengh of 72. Also there is less chance for blocking the 72 Mhz signal because the transmitter antenna is long and some portion is always looking at the model. Having said that, the 2.4 system will work at the limits of visibility (even DP's) as long as it has a clear shot. I tested my DX7/AR7000 (one satellite) in my house on the theory that it would work wherever the 2.4 router signal worked. I was basically correct although I had only a rudimentary method of testing the router. The signal easily penetrated through three stories of house and down the street about 500 feet with only a few fades, no packet drops and no holds. However, on a range test at 100 feet with the test button depressed, signal will be lost if you turn your back (place your body between the transmitter and model). You will also probably loose signal in flight if another person stands between you and your model. You will certainly loose signal if there is any metal object between you and your model. Looking again at the 2.4 router example, the router signal will not penetrate filing cabinets or other metal objects. The Supra installation in the 2.4 friendly pod is perfect. Hundreds of flights with no problems and now with the data capable AR7000, I can collect real numbers not just my impressions. In the several flights since data collection began, the most fades on any antenna has been 250 (10 minute flight), no lost packets and no holds. I lost a Twin Star today when the system locked out and did not reboot (reacquire) before the altitude was gone. It was using a single AR6100 and had flown for several hours on previous occasions. The model was 700 feet upwind at about 200 feet when the incident occurred. Following impact, the system worked fine as it had time to reboot. The 6100 will be replaced with an AR6200 and a satellite receiver. Bottom line - 2.4 Ghz works but requires some thought about receiver installation and transmitter location during flight. It is not as forgiving as 72Mhz, but for me, provides much more security in the crowded, uncontrolled flying sites that I frequently visit. Now can I feel the difference? I have only been using the system about a year, so maybe next year I can answer the question. Don Richmond San Diego, CA [EMAIL PROTECTED] www.hilaunch.com -- Create a Home Theater Like the Pros. Watch the video on AOL Homehttp://home.aol.com/diy/home-improvement-eric-stromer?video=15?ncid=aolhom000301 .
