Thread Tools
Old Aug 23, 2012, 04:07 PM
RyanNX211 is offline
Find More Posts by RyanNX211
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
Sign up now
to remove ads between posts
Old Aug 24, 2012, 10:45 AM
JimDrew is offline
Find More Posts by JimDrew
Xtreme Power Systems
No news on 900MHz that we can release to the public at this time.
RCG Plus Member
Old Aug 28, 2012, 10:59 AM
RyanNX211 is offline
Find More Posts by RyanNX211
Thermals, Tom
RyanNX211's Avatar
Darn!
Old Dec 18, 2012, 07:50 PM
RyanNX211 is offline
Find More Posts by RyanNX211
Thermals, Tom
RyanNX211's Avatar
Quote:
Originally Posted by JimDrew View Post
No news on 900MHz that we can release to the public at this time.
How about now?
Old Dec 19, 2012, 01:01 AM
JimDrew is offline
Find More Posts by JimDrew
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.
RCG Plus Member
Old Dec 19, 2012, 08:47 AM
plaurence is offline
Find More Posts by plaurence
Plaurence
Quote:
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?
Old Dec 19, 2012, 10:11 AM
JimDrew is offline
Find More Posts by JimDrew
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.
RCG Plus Member
Old Dec 19, 2012, 12:09 PM
RyanNX211 is offline
Find More Posts by RyanNX211
Thermals, Tom
RyanNX211's Avatar
Sounds promising.
Old Dec 19, 2012, 01:28 PM
JimDrew is offline
Find More Posts by JimDrew
Xtreme Power Systems
It's used for our UAV applications. It's kind of the 'holy grail' for aircraft communications.
RCG Plus Member
Old Dec 19, 2012, 07:03 PM
tande is offline
Find More Posts by tande
Registered User
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.
And the "Down/Side" would be? .........
Old Dec 19, 2012, 09:00 PM
JimDrew is offline
Find More Posts by JimDrew
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.
RCG Plus Member
Old Dec 19, 2012, 09:15 PM
RyanNX211 is offline
Find More Posts by RyanNX211
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.
Old Dec 20, 2012, 12:02 AM
dirtybird is offline
Find More Posts by dirtybird
Registered User
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?
Old Dec 20, 2012, 10:24 AM
JimDrew is offline
Find More Posts by JimDrew
Xtreme Power Systems
Quote:
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.
RCG Plus Member
Old Dec 20, 2012, 10:25 AM
JimDrew is offline
Find More Posts by JimDrew
Xtreme Power Systems
Quote:
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.
RCG Plus Member


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Gently used 900 mhz patch and 1/2 wave 900 mhz tx antenna Kahuna717 FPV Equipment (FS/W) 2 Oct 02, 2011 05:50 AM
Help! RV 900 mHz TX/RX, DX-201. PROBLEMS bsfixit FPV Talk 3 Sep 12, 2011 03:13 PM
Found 900 mhz Receiver thefokker FPV Equipment (FS/W) 3 Sep 08, 2011 03:53 PM
For Sale Gently used 900 mhz patch and 1/2 wave 900 mhz tx antenna Kahuna717 FPV Equipment (FS/W) 1 Aug 02, 2011 09:53 PM
For Sale Gently used 900 mhz patch and 1/2 wave 900 mhz tx antenna Kahuna717 FPV Equipment (FS/W) 4 Jul 03, 2011 12:20 AM