Battery model
Model of the original battery (see “Battery type”) for which the helicopter is designed. Most often, such a battery is supplied with the device. Data on the battery model may be needed if it is out of order and needs to be replaced, when looking for a spare battery or when selecting a charger (usually, charging capabilities are already provided in the standard package, but it is possible that a separate device will be required).
Radio frequency
The frequency at which the helicopter control transmitter operates.
—
27.145 MHz. One of the frequencies used for radio remote control for a long time; in some CIS countries it is even reserved by state regulatory bodies for this very purpose. Such transmitters are relatively inexpensive, but suffer from one serious drawback: they do not provide channel separation when several consoles are operating in close proximity to each other. In other words, if the helicopter stays in the coverage area of two transmitters, the signals from them will be mixed, which is actually equivalent to a loss of control. This is most often unimportant in "recreational" flights; however, at competitions and other public events where several cars can be in the flight zone at the same time, very unpleasant and even dangerous situations can arise. You can avoid such situations by developing a common frequency grid and using interchangeable crystal oscillators for consoles — but such features are not always available. As a result, this frequency is gradually being replaced by the more advanced 2.4 GHz standard, not only among professional, but also among amateur models.
Separately, we note that transmitters with frequencies of 35, 40 and 75 MHz can also be found on the market; according to the main features, they are completely similar to the described 27.145 MHz and differ only in the operating frequency.
—
2.4 GHz. Today's most advanced communication standard used by remote control helicopters. Its main feature (and difference from the above options) is the possibility of normal operation of several transmitters of this format in close proximity to each other. To do this, various technologies are used that provide automatic distribution of receiver-transmitter pairs over their own channels (similar to how it happens, for example, in mobile communications). Theoretically, the 2.4 GHz band may be more prone to interference, as many modern electronics work in it (in particular, Wi-Fi and Bluetooth modules); however, thanks to the distribution of channels mentioned, such problems arise only in very unfortunate cases, but are solved easily and quickly. In addition, due to the coincidence in frequencies with the Wi-Fi standard, models for such remotes can be easily controlled from a smartphone (see below).
Power source
The type and number of batteries needed to operate the helicopter control panel.
— AA. Replaceable batteries, colloquially known as "AA batteries". They are available not only in the form of disposable batteries, but also in the form of rechargeable batteries, are produced under various brands that differ in price and quality (which provides freedom of choice), and finding such elements on the market is usually not a problem. The power and capacity of AA elements are relatively small, but in most cases they are quite enough for normal operation of the transmitter for quite a long time. Usually, modern remotes require several of these batteries — usually 2, 4 or 6.
— AAA. Also known as "pinky". In fact, a smaller version of popular AA elements (see above); has the same key features, but differs in more compact dimensions and, as a result, somewhat reduced power. This option is typical for low-cost class models, with a small range of the remote control.
