Family Radio Service (FRS) Radios and the Real World - What Can Users Expect?
The Family Radio Service (FRS) provides an inexpensive, yet effective portable communications tool for families and other groups. FRS radios are small, lightweight, and relatively inexpensive considering the technology they use and the quality of the communications they provide. Our family finds them useful for keeping track of the kids around the neighborhood and staying in touch with each other when on camping trips and other family outings.Though manufacturers almost invariably claim a range of two miles for FRS radios, the actual range can vary considerably depending on a number of factors.
The maximum permitted output power of FRS radios is 500 MW ERP. FRS radios operate at UHF radio frequencies. At these power levels and frequencies, portable to portable radio communications are typically "line-of-sight" in nature. Does this mean that the radios will only work if the users can see each other? Not exactly. However, if you can see the other user, you can be certain that you will be able to communicate with them using your FRS radios. In fact, some FRS users have communicated over distances of 15 miles or more when operating from atop mountains with unobstructed, line-of-sight paths.
In this context, "line-of-sight" can be interpreted to mean that the signal quality will suffer when line of sight conditions are not present. Line-of-sight distance can be affected by man-made structures, terrain, the curvature of the earth, or any combination thereof. The following illustrations show you what ranges you can expect for reliable communications from typical FRS radios under a variety of operating conditions. Remember, these are best estimates under typical conditions. Your range may be greater or less depending on your specific operating circumstances.
To ensure maximum performance, remember the following tips:
- Fresh batteries will provide better performance than weak batteries.
- Transmit and receive performance is reduced considerably when the radio is clipped to your pocket or belt, or otherwise placed such that the antenna is blocked by your body.
1. Line-of-sight, open conditions:
- A good rule of thumb - when attempting to predict range using the following diagrams, if more than one condition exists (i.e., "using the radio from within a building" and "using the radio in heavily wooded areas"), your range will typically be a little bit less than the worse of the two (or more) operating conditions depicted in the diagrams.
2. Obstructed by gentle, rolling hills:
3. Obstructed by steep hills, ravines, sudden terrain changes:
4. Operating in heavily wooded areas:
5. Operating in suburban or light urban areas:
6. Operating in dense urban areas
7. Operating with one user inside of a building:
8. Operating inside of large buildings:
9. Operating from within moving vehicles:
Good places to go for more FRS information:
- Family Radio Service (FRS) Information
- KAF9830 General Mobile & Family Radio Service Information Page
