Information on Transmitters and Recievers

The ISAF RRS Specifies in the rules that FCC regulations must be followed

The FCC has allocated certain bands of frequencies for Radio Control use by hobbyists. A band is a group of frequencies. Each frequency within each band is assigned a channel number for simplicity.

27 Mhz band for toys and general use- Not recommended for sailboats.

75 Mhz band for surface vehicles (boats and model cars) using channels 61-90. The Micro Magic, Seawind and the One Meter class boats in our club use two servos. One for rudder control and the second for the sail control.

Modulation types:

AM is the least costly way to go, but is more susceptible to interference than FM. Costs for a Two-Channel AM Transmitter, receiver and two servos is around $50 with some models a bit higher.

 FM is less susceptible to interference - Cost with transmitter, receiver and two servos is $85 and higher.

Crystals- The operating frequency for AM and FM type transmitters are crystal controlled. Both transmitter and receiver crystal must operate on the same channel (frequency). Our club website publishes the channels that are in use by each of our members. Check the club channel list before purchasing a new transmitter to avoid duplication and conflict with other members’ radios. Receiver crystals can be changed by the user but you cannot legally change your transmitter crystal. You must return the transmitter to factory service for recalibration and retuning. (FCC rule Sec. 95.222 (R/C Rule 22) transmitter crystal. You must return the transmitter to factory service for recalibration and retuning. (FCC rule Sec. 95.222 (R/C Rule 22).

Spread Spectrum (Spektrum) 2.4 Ghz band . Best way to go but highest in cost. 80 channels are available but it actually uses two channels for higher reliability. Channels are selected automatically by the transmitter and receiver when you power on by searching within the 2.4 Ghz band for any open channels and locks on for your exclusive use. Costs for Specktrum radios have come down as they have increased in popularity and technology has advanced. Once $200 and higher for transmitter, receiver and servos (if you are upgrading your servos will work with Spread Spectrum) they are now starting at $100 and are now becoming available on the used market for even less.  Similar to Spektrum but with a plug-in module. Also uses short transmitter and receiver antennas. Spread Spectrum units do not require crystals. 

Transmitters are sold with either a stick control (preferred) or a pistol grip. Pistol grip transmitters are not recommended due to the spring loaded sail trigger having to be held in position. You will have finger fatigue very quickly.

Always range check radio equipment before sailing.