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Old Aug 23, 2012, 03:07 PM
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Upper Arlington, Ohio
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Any news on 900Mhz? The website isn't updated very often and a lot of things seem to be out of stock
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Old Aug 24, 2012, 09:45 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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No news on 900MHz that we can release to the public at this time.
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Old Aug 28, 2012, 09:59 AM
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Darn!
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Old Dec 18, 2012, 06:50 PM
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Originally Posted by JimDrew View Post
No news on 900MHz that we can release to the public at this time.
How about now?
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Old Dec 19, 2012, 12:01 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Nothing yet. Since acquiring XPS, I have been focused on producing products that have already been developed. I will look at 900MHz next year.
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Old Dec 19, 2012, 07:47 AM
Plaurence
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Originally Posted by JimDrew View Post
We have always had frequency hopping. In October of 2008 we added 4 new frequency hopping modes (to conform with European EN300-328 rules changes). We also added a low voltage warning, and 80% of our customers immediately reported the warning coming on!

900MHz is definitely a better frequency for flying. We will have both 900Mhz and 2.4GHz versions of our transmitter, as well as the exact same receivers available in both 900MHz and 2.4GHz versions.
Jim,

Why is 900MHz better than 2.4?
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Old Dec 19, 2012, 09:11 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
15,700 Posts
900MHz has far less noise and 1.72 times the range at the same output power and sensitivity. However, the 900MHz products offer sensitivity of over -120dBm, which is 18dBm better than our Nano receiver (which is -102dBm, the best sensitivity of any receiver in RC until our new receivers come out at -110dBm). Every 6dB doubles the range. So 2 x 2 x 2. So, figure 8 times the range x 1.72. Theoretical range is 43 miles with the 900MHz module - same size and format as my DivBee module.

900MHz also has no issues with water, and very little issues with metal, carbon, wires, etc. The 900MHz band is exceptional clean in the U.S. with just a hand full of legacy devices still using it, and those are relatively short range and confined to house holds. The only issue could be FPV systems running on 900MHz, but the same is true of 2.4GHz FPV systems.
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Old Dec 19, 2012, 11:09 AM
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Sounds promising.
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Old Dec 19, 2012, 12:28 PM
Xtreme Power Systems
Lake Havasu, AZ
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It's used for our UAV applications. It's kind of the 'holy grail' for aircraft communications.
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Old Dec 19, 2012, 06:03 PM
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Originally Posted by JimDrew View Post
900MHz has far less noise and 1.72 times the range at the same output power and sensitivity. However, the 900MHz products offer sensitivity of over -120dBm, which is 18dBm better than our Nano receiver (which is -102dBm, the best sensitivity of any receiver in RC until our new receivers come out at -110dBm). Every 6dB doubles the range. So 2 x 2 x 2. So, figure 8 times the range x 1.72. Theoretical range is 43 miles with the 900MHz module - same size and format as my DivBee module.

900MHz also has no issues with water, and very little issues with metal, carbon, wires, etc. The 900MHz band is exceptional clean in the U.S. with just a hand full of legacy devices still using it, and those are relatively short range and confined to house holds. The only issue could be FPV systems running on 900MHz, but the same is true of 2.4GHz FPV systems.
And the "Down/Side" would be? .........
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Old Dec 19, 2012, 08:00 PM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Nothing that we have seen so far. This is why the military/Boeing/Lockheed/etc. all use 900MHz for their UAV aircraft.
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Old Dec 19, 2012, 08:15 PM
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Upper Arlington, Ohio
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Why did we jump on 2.4 so fast?
Will 900mhz be as imune to ignition noise as 2.4? Theoretically, we should be able to do away with the resistor in the high tension lead but while it no longer needs 10ohms, no one has gone below 1ohm.
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Old Dec 19, 2012, 11:02 PM
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Quote:
Originally Posted by JimDrew View Post
900MHz has far less noise and 1.72 times the range at the same output power and sensitivity. However, the 900MHz products offer sensitivity of over -120dBm, which is 18dBm better than our Nano receiver (which is -102dBm, the best sensitivity of any receiver in RC until our new receivers come out at -110dBm). Every 6dB doubles the range. So 2 x 2 x 2. So, figure 8 times the range x 1.72. Theoretical range is 43 miles with the 900MHz module - same size and format as my DivBee module.

900MHz also has no issues with water, and very little issues with metal, carbon, wires, etc. The 900MHz band is exceptional clean in the U.S. with just a hand full of legacy devices still using it, and those are relatively short range and confined to house holds. The only issue could be FPV systems running on 900MHz, but the same is true of 2.4GHz FPV systems.
Do you have test data to back up those figures?
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Old Dec 20, 2012, 09:24 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Originally Posted by RyanNX211 View Post
Why did we jump on 2.4 so fast?
Will 900mhz be as imune to ignition noise as 2.4? Theoretically, we should be able to do away with the resistor in the high tension lead but while it no longer needs 10ohms, no one has gone below 1ohm.
Any radio frequency above about 300MHz is immune to ignition noise.
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Old Dec 20, 2012, 09:25 AM
Xtreme Power Systems
Lake Havasu, AZ
Joined Jun 2005
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Originally Posted by dirtybird View Post
Do you have test data to back up those figures?
Absolutely! Both real world, and theoretical calculations... you can do those yourself by knowing the link budget and frequency. There are plenty of applications available that will calculate your range based on that info.
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