Hello everybody, I am looking for Ultra Long Range Telemetry radio with range over 60km… I undertand 1 watt power of RFD900x, but I need longer. I consider
this Arkbird 5w 433 Uhf radio . Anybody has experience with thhis radio??
Any suggestion or advice??
Thank you…
The RFD900X has been known to reach well over the stated 40km even at high baud rates - exactly how far do you need to go? I know of over 130km with altitude (but I dont have the logs and they are not my logs to share).
A directional antenna with tracker at the ground station could be most useful solution.
Hi @xfacta ,
Thank you for your response, any suggestion for good directional antenna for 915MHz.?
I would purchase one via RFD to make sure it really is suitable. I’ve seen yagis online that are not very good quality or not really for the frequency you expect.
RFD also have 5db and 8db antennas, so one of those and a yagi on a RFD900X (since they have two antenna ports with diversity) and you’d be looking at communicating with the air radio at astronomical ranges. Check the notes for the yagi because you also need the correct cable and adapters.
Hey!
I am trying to establish 2-way telemetry connection with my stratospheric drone at 30 km altitude. And 100+km away.
Any ideas on what to procure?
RFD900X or UX radios - that’s my idea
433MHz radios could potentially have a long range, but that frequency band gets full of noise from garage door openers, baby monitors, every piece of cheap junk with a radio in it…
There are garages and babies at an altitude of 30 kilometres? 
In most countries of the world, band 433 for radio amateurs is allowed for free use. Perhaps at high altitude, your plane can receive messages from distant long-distance enthusiasts who can take advantage of the effect of radio waves bouncing off the moon. However, amateur radio communication can use high-quality antennas and high power, for example, 10 watts.
Obviously, at high altitudes, it is rational to use satellite communications, but this is beyond the scope of our hobby.
Radio communication using reflection from the Moon
In recent years, a new type of radio communication has been developed that uses the effect of reflection of radio waves from the surface of the Moon. This type of radio communication is attracting an increasing number of enthusiasts.
To implement this type of radio communication, more advanced equipment is required. For example, radio communication in the 144 MHz band requires receivers with a noise level of no more than 2 dB, and for the 432 MHz band - no more than 4 dB; the transmitter power reaches 500…1000 W. Narrowband radio requires low-noise input devices in the receiver, as well as stable quartz filters. Радиосвязь с использованием отражения от Луны | RadioUniverse Use a translator Поиск Microsoft Translator — перевести с Русский