1.- What frequency band does the radio work in?
The 900 Mhz ISM band (902-928 Mhz)
2.- Will your radios run on solar power?
Yes. Our radios will run on any DC power from 10 to 35V that will source 1 amp. Don’t put one in for the radio’s sake, though, just use regular batteries.
3.- Will your radios run on lithium batteries?
Yes. Our radios will run on either primary (single use) or secondary (rechargeable) types. The battery must reliably supply 10V at 1A. Remember that rechargeable lithium batteries typically won’t charge below 0 degrees C.
4.- Will your radios run on alkaline batteries?
Yes, 8 D cell batteries should power the radio for 3 to 5 years, depending on how often you poll and how many interferers there are nearby.
5.- What range will one of Myotis’ radios attain?
Like all radios, the range it attains depends greatly on the characteristics of the actual path such as the presence of hills or buildings and the presence of other radios in the same band. (In many cases we find that interference, rather than attenuation, is the predominant factor.) We’ve tested our radios out to 30 km (okay, 29) with very solid results. As soon as we can find a high enough tower that doesn’t have tons of interference, we expect to test well beyond 40 km.
In practice, we’d say the radio will achieve the same range as other leading radios in the 900 Mhz ISM band.
6.- What is Batlan technology and how did you come up with the name? ?
Batlan is a patented spread spectrum digital modulation technique which uses chirp signals to convey digital information over the wireless channel. The name Batlan came about early in our research. Certain species of bats (you might be able to guess the genus) use chirps to navigate and catch prey. It turns out they used chirps for many of the same reasons we used to build a great radio: low power and high resistance to interference. We weren’t so worried about the ability to find mosquitoes, though.
7.- What are Chirp signals?
Chirp signals are commonly referred to as Continuous Frequency Modulated (CFM) signals and it is their continuous (rather than discrete) nature which makes them unique when used in spread-spectrum systems. Chirp signals have long been known to possess many unique properties which avail themselves well in wireless systems. Many of these properties turn out to be particularly well suited to low power applications.
8.- What's your occupied bandwidth?
8 MHz.
9.- Doesn't that make you susceptible to interference?
No, because we have 17 dB of processing gain.
10.- What's your signalling rate?
500 Kb/s
11.- Does your radio interfere with others?
Not very much. It has a very low duty cycle (usually on for less than 5 ms) and its power spectral density (PSD) is very low
12.- How complicated is it to configure your radio to work with Modbus?
Not very. The radio works with Modbus RTU right out of the box. You can configure and monitor a Myotis radio system using the SCADA HMI you have right now.