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
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