Which module should I use for my application?

There are several factors to consider when selecting the best module for your application. We will start with the legal considerations.

The FCC per Part 15, section 231 (a-d) does not allow the continuous transmission of real time variable data in the 260-470MHz band. It is restricted to control signals, such as for garage doors, remote keyless entry, and security systems. Per section 231 paragraph e, you can send variable data as long as it is at half the power, the transmission does not last more than 1 second, and there is at least a 10 second gap between transmissions. At 900MHz, there are no restrictions on the type of data to be sent. Please see Application Notes AN-00125, AN-00126, and the FCC Resource Document for more details.

After determining in what frequency band your application can legally operate, consider the technical aspects. AM is less expensive and draws less current, but is much more susceptible to noise, especially from motors and switching power supplies. The propagation of the signal gets more difficult as the frequency goes higher, so the 900MHz modules have a higher output power. This, combined with the fact that a continuous carrier modulation method, such as FM/FSK, is usually employed for better performance, generally means a 900MHz product will draw more current than the 315-433MHz modules.

The LR Series is a second generation AM radio that greatly extends the range of our current products to over 2,500 feet. This series has exceptional noise immunity for an AM/OOK product and will work in areas where other AM radios would fail. This series can easily be combined with the MS Series encoder and decoder to create a long-range remote control system.

If you want to transmit simple switch closures or button presses, then look at the KH2 Series. This series has an encoder/decoder built in so you do not have to develop any protocols.

The ES Series is a great compromise between cost, size, and performance at 900MHz FM. This module can transmit data and audio without having to worry about the legal issues of the lower band.

If you need multiple channels, the HP3 Series has 8 parallel selectable channels or a version with 100 serially selectable channels. This series also has audio quality comparable to intercom or FM radio, and a data rate up to 56kbps.

In addition, our OEM products, such as the keyfobs and handheld transmitters and AC and Relay receiver modules, are FCC certified and can be cosmetically customized to your requirements! These devices provide a fast and cost effective entrance into wireless.

For more information on these modules, please see the module specific application notes and the data guides.