I have tested my stock Futaba 6ex 2.4ghz out to 1.75 miles with no problems,
but it probably can not match the video range. But as a general rule Futaba transmitters are twice the range of Spektrum ones.
I hope this can save other people from searching the internet for hours on end for the best deal.
Question about this... Is it true that the higher the frequency the faster it drains the battery? for example I will keep the numbers small for easy math:
Given a 1000Mah battery
900Mhz @ 100Mw power = A hours battery life
1.2Ghz @ 100Mw power = B hours battery life
2.4Ghz @ 100Mw power = C hours battery life
3.4Ghz @ 100Mw power = D hours battery life
5.8Ghz @ 100Mw power = E hours battery life
or will they all be the same because thy are all outputting the same "100Mw" power raiting? How do these transmitters work?
Your second assumption is the correct one. "Power" is the measure of energy output, 100 milli watts or .1 watts will draw the same current regardless of the transmitter frequency. The diference is in how far the RF wave will travel on that same 100 milli watts. The higher the frequency the shorter the distance you will travel with the same amount of power.
I have another question, is it generally true that the lower the frequency the larger/heavier the transmitter?
and another question concerning these transmitters in particular, how do voltage requirements fluctuate from low frequency transmitters to high frequency transmitters? In my research I am finding that they all operate in the same general voltage range, but I know that if I increase my voltage to my Tx then the mili-amp-hour draw will be less. Do I understand correctly, how does this balancing act work?
it might help you to answer this if you know why I am asking. I am looking into the Hydogen fuel cell to power my onboard electronics and LiPo batteries for my electric motor. The fuel cell provides Tons of mAh at very low voltage while the LiPo provides both, the whole system is augmented with solar panels to assist power requirements druing daylight operations. My fear is that I will have to power my video Tx off of my LiPo which will decrease my overall flight time (not something I can do).
Well I do know that the lower the freq. the lower the data rate. Would Keegan still be able to send his video over the 72mhz freq? I thought that's why everyone used the 1Ghz+ range for video and the lower 900Mhz and below for remote control/navigation.
No no no, 72mhz is ONLY for RC control, it works very well and no reason not to use it.
It will give you back 2.4ghz for the video and 900mhz for data - this is what I use (36mhz for Australia) and it works fantastic.