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Aug 23, 2012, 03:07 PM
Thermals, Tom
RyanNX211's Avatar
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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Aug 24, 2012, 09:45 AM
Xtreme Power Systems
No news on 900MHz that we can release to the public at this time.
Aug 28, 2012, 09:59 AM
Thermals, Tom
RyanNX211's Avatar
Darn!
Dec 18, 2012, 06:50 PM
Thermals, Tom
RyanNX211's Avatar
Quote:
Originally Posted by JimDrew
No news on 900MHz that we can release to the public at this time.
How about now?
Dec 19, 2012, 12:01 AM
Xtreme Power Systems
Nothing yet. Since acquiring XPS, I have been focused on producing products that have already been developed. I will look at 900MHz next year.
Dec 19, 2012, 07:47 AM
Plaurence
Quote:
Originally Posted by JimDrew
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?
Dec 19, 2012, 09:11 AM
Xtreme Power Systems
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.
Dec 19, 2012, 11:09 AM
Thermals, Tom
RyanNX211's Avatar
Sounds promising.
Dec 19, 2012, 12:28 PM
Xtreme Power Systems
It's used for our UAV applications. It's kind of the 'holy grail' for aircraft communications.
Dec 19, 2012, 06:03 PM
Registered User
Quote:
Originally Posted by JimDrew
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? .........
Dec 19, 2012, 08:00 PM
Xtreme Power Systems
Nothing that we have seen so far. This is why the military/Boeing/Lockheed/etc. all use 900MHz for their UAV aircraft.
Dec 19, 2012, 08:15 PM
Thermals, Tom
RyanNX211's Avatar
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.
Dec 19, 2012, 11:02 PM
Registered User
Quote:
Originally Posted by JimDrew
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?
Dec 20, 2012, 09:24 AM
Xtreme Power Systems
Quote:
Originally Posted by RyanNX211
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.
Dec 20, 2012, 09:25 AM
Xtreme Power Systems
Quote:
Originally Posted by dirtybird
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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