Q1: What is tBeacon and what its purpose?A:tBeacon was originally designed to aid in locating a lost RC aircraft (airplanes, helis, multicopter), but also successfully used to locate a fallen rockets, balloons, as an anti-thief system for bicycles and motorcycles, and even to locate lost cows :) tBeacon is superior to its competitors cause it's independent of cell coverage, has low weight and size. It offers several modes of operations: reporting GPS coordinates, radio direction finding, and also unique Proximity mode, which is essentially radio foxhunting on steroids. To aid searching in a close proximity the beacon is equipped with a loud buzzer and bright LED.
Q2: WANT!A: There are two options to get the beacon: to DIY, or to buy. DIY question is next. If you want to buy you can do it here, or in stores. Buying from me is very simple: you pay via PayPal, and I’ll send it to you.
Q3: Сan I DIY?A: Yes, you can make a beacon for your own personal use. You can take the ready-made OpenLRS RX and flash it with tBeacon firmware. Or make PCB and solder it by yourself. All instructions are provided. like this). Also there are adapters for some autopilots/drones available for purchase.
Q5: What frequencies can tBeacon work at?A: 413MHz - 490MHz. This includes all of the allowed ranges: LPD, PMR, FRS / GMRS.
Q6: How the beacon knows the GPS location?A:The beacon is able to "eavesdrop" all common GPS receivers and autopilots protocols. The optimal solution is to connect the beacon to the onboard GPS, it saves weight and prolongs the beacon operation time. But it is possible to use a dedicated GPS-receiver exclusively for the needs of the beacon. In this case, it is recommended to power the GPS-receiver with on-board power.
Q7: What autopilots / GPS supported by the beacon?A: Virtually all of them :) The beacon can understand GPS NMEA and UBX protocols, it covers all hobbist GPS-receivers. Also telemetry protocols of MAVLINK and NAZA and ET OpenTelemetry are supported.
There are wiring diagram for some common cases.
NAZA protocol is supported for NAZA M V1/V2/Lite + GPS.
Q8: How can I activate a radio beacon? What is Tone Burst?A: The beacon is activated when it senses specific audio tone of 1750Hz in the air. This tone is called Tone Burst and is used to select an amateur radio repeaters. By default, the beacon listens for a call with an interval of 3 seconds. That is, to guarantee the beacon is activated, you need to provide a signal on the air for a little more than 3 seconds.
The period can be decreased or increased and, respectively, increase or decrease the power consumption of the beacon.
Q9: Can I activate the beacon if my radio does not support Tone Burst?A: Yes, you can use CTCSS subtone or generate tone of the needed frequency with your smartphone, etc.
Q10: I've bought a beacon, and it doesn't work as expected.A: A beacon being powered on emits a welcome beeps and reports the battery voltage on the programmed frequency (433.075MHz by default) . Then the beacon goes into standby mode: green LED flashes every second, and red LED flashes in moments of any activity. If you can't hear anything in the air, you should check that the beacon and the radio tuned to the same frequency (it is recorded in Hertz in configurator, do not miss zeros) and make sure that CTCSS/DCS is off.
If you have a Baofeng UV-5R radio and the beacon does not respond to the call, try to press the PTT + A/B (not BAND: there is an error in the radio's manual).
If you feel that Baofeng UV-5R "swallows" the beginning of the transmission, you need to set STE and RP-STE to OFF in the radio's settings.
Q11: How accurate is the coordinates that the beacon transmits?A: It’s exactly as accurate as their source :)
It is possible that during the crash the GPS antenna becomes turned upside down or shaded by something. In that case the accuracy of the coordinates could decrease, but the deviation could hardly exceed 10 meters.
Another point to be aware of. The beacon reads the coordinates not continuously, but at a specified interval, which by default is 10 seconds. I.e. there could be situation when the beacon read coordinates in flight, and then after 9 seconds the aircraft could hit the ground and become de-energized along with GPS receiver. In this case, the beacon will remember the last position (in air) and the crash site will be spaced from the reported coordinates for a distance determined by the speed of the aircraft. For fast planes it can be critical (at a speed of 100km/h in 9 seconds, the plane can fly about 250 meters). In this case it is recommended to reduce the interval of GPS reading.
Q12: How to locate a lost or downed craft with the beacon?A: First, you need to determine the search area. If you are in the lowlands, it is better to move as high as possible and try to call the beacon. If the beacon has replied, then that's half the battle, enter the coordinates into your favorite navigation app and have a nice journey to the crash site :)
If the there is no answer, then either the beacon can not receive our signal, or (which is more likely) we can not receive the beacon signal. In this case it is necessary to move higher, or closer to the proposed crash site or simply change your location at random. Ultimately, you should hear the voice of the beacon and receive the coordinates.
If for some reason there are no valid coordinates, then the beacon can be found in a similar way used in ARDF or “radio foxhunting”. The three beeps emitted by the beacon have different power: the first is the most powerful, the second is weaker and the third is quite weak. Thus, by shielding the transceiver by your body or other materials you can determine the direction to the most powerful (clear) signal. Taking a few bearings from different points, one can draw them on the map and found the crash site at the point of intersection. Or simple way: go the direction of stronger signal. You may have more to stray, but on the other side you do not need a map and a compass.
Q13: Can I connect a beacon to the DJI Phantom?A: Connecting to Phantom's older that Phantom 3 is similar to other Naza’s. For convenient connection, you can solder or buy an adapter. You can connect the beacon to Phantom 3 using two equal way: to solder some wires directly to the P3 mainboard or to buy an adapter.
There is no adapter for Phantom 4, but the beacon can be soldered to mainboard or used autonomously. The same story is with Mavic, but the solderless adapter is being developed.
Q14: How can I set baud rate, protocol and type of autopilot/GPS?A: All of the parameters of interaction with autopilot/GPS are determined automagically.
Q15: Are there any interferes between the beacon and a UHF LRS Systems?A: Sure, if both frequencies are close to each other there will be interferences, BUT... :)
First, you can set any UHF frequency you like on the beacon, given that it is supported by your radio transceiver and is legal in your country.
Second, and the best: the beacon will not transmit anything by its own. It will transmit only when activated by a call or by a timer.
Q16: My antivirus complains that the configuration utility is infected with trojan and blocks it.A: This is a well known fact. The point is that the configurator is written using AutoIt3 language, and its compiler “aut2exe” is falsely identified as trojan by some stupid antiviruses. This is the case with, for example, Avira/Avast.
You can find more info on the topic: google
You can safely disable antivirus and run the configurator, it’s harmless, I swear :)
Q17: Can I power the GPS module from the beacon battery?A: You can, but this does not makes sense. A typical GPS receiver consumes about 50mA, so a battery with capacity of 60mAh will lasts only for 1 hour.
It is more feasible to use the onboard GPS receiver, as it saves weight and battery consumption and your money. :)
If you still need to have a separate GPS for the beacon, it is advised to power it from the on-board battery.
Q18: What is the operating range of the beacon?A: If you have a direct line of sight(LOS), good antennas and no interference, the range is not limited to common sense, it is tens of kilometers.
In practice, of course, things are not so easy, and it depends on many factors, and one of the most important is the presence/absence of LOS. However, I was able to activate the beacon in the center of a big city, without direct LOS, at a distance of 3 km. And this is with a plain “rubber ducky” antenna and even not leaving the car. Although, of course, at the limit of recognizability. Theoretical range of radio communication under ideal conditions when the beacon is on the ground, and the radio in the hands of an adult - about 4km.
Q19: How long can last the battery of the beacon?A: With the default settings and the battery of 60mAh the beacon can lasts in standby about 6-7 days. With due skills and some compromises, it is possible to increase it to a month or more. On the other hand, it can be configured so that will hardly last for one day :)
And of course, the more capacious battery is used, the longer it lasts. And standy time reduces with every activation.
Q20: Why DTMF has been removed? It was convenient to have a coordinates on the smartphone.A: For two reasons. The first is the lack of flash memory in the microcontroller: all feasible features simply do not fit.
The second is the low noise immunity of DTMF. In a noisy receiving conditions where a person can still easily recognize the voice among the noise, DTMF have failed miserably.
Weighing all the "pros" and "cons", I decided to remove DTMF in favor of more useful features.
Q21: Can I power the tBeacon BLUE with LiFe, LiIon, NiMH battery, etc.A: Without mods it is possible to power the beacon with voltage of 3 to 6.5 volts. Of course, you have to disconnect charging source in this case.
With a small mod it can be powered from any source up to 16 volts. The mod is simple: you have to remove the top left resistor marked 1005. The battery voltage check will not work after that.