RF Receiver Module for Jump Jet

The RF receiver module is a 2gram unit designed to be installed onto a Jump Jet in place of the infrared sensor, so that the plane can be flown using standard FM radio transmitters. It allows the aircraft to be flown outdoors, at greater range than is possible with infrared. In optimum conditions the range is about 100 metres, which is much further than it is possible to see the plane!

The receiver is available in 35MHz and 72MHz versions, suitable for operation in different areas. It accepts GWS or Berg micro receiver crystals, available at hobby stores.

Please note that some simple soldering is required to complete the installation.
We regret we are not able to supply new Jump Jets with pre-installed RF module.

The RF Module

The Installed Unit

Transmitter Requirements

In order to fly the upgraded Jump Jet, you will need a transmitter. However, because the Jump Jet was not originally designed to work with hobby transmitters, there are some restrictions on the types which can be used. The good news is that the suitable ones tend to be the least expensive. We also offer a Software Upgrade Service for the Jump Jet's onboard flight computer in order to allow a much wider range of transmitters to be used, and to improve overall performance under radio control.

In order to work with the standard Jump Jet, the transmitter must meet the following requirements:

Correct frequency, FM transmission. Outside North America, the RF module is supplied with a 35.200MHz (Channel 80) crystal pre-fitted. The 35MHz unit can also be operated in the 36MHz and 27MHz bands, but please note that many 27MHz transmitters use AM.

PPM signalling.

Futaba standard channel sequence: 1=Aileron, 2=Elevator, 3=Throttle, 4=Rudder. In addition to Futaba, the Hitec, GWS and Century brands all use this sequence.

Servo reverse switches.

If your Jump Jet came with a separate Power LED standing up on the board (in addition to the tiny "signal present" LED), then it should work with a transmitter which has four or more channels.

If your Jump Jet did not come with a separate Power LED, then it requires a transmitter with 4 channels, and no more. Please refer to "Choosing a 4-Channel Transmitter" below.

Choosing a Four Channel Transmitter

If your Jump Jet requires a 4-channel transmitter, then there are a number of options available. The Futaba channel sequence is very popular among other brands, and most manufacturers offer a budget 4-channel set. Unfortunately, the Futaba Skysport 4 (T4YF) transmitter is not suitable, because it actually transmits 5 channels, even though only four are connected to the physical controls! The fifth channel is there unseen, and will prevent the Jump Jet from working properly. However the excellent GWS GWT4A II really is a 4-channel radio, as is the Hitec Focus 4, and the more recent Laser 4. The Century Lightning 4 also works well. Many older sets will work, but it would be wise to try out any unit before purchasing it specially, since manufacturers often change their specifications without warning. In their manual, Futaba make NO MENTION of the fact that the Skysport 4 really has 5 channels!

Specification

Software Upgrade Service

We can upgrade the software carried within the Jump Jet's onboard flight computer. This will bring several major benefits when flying by radio control:

Transmitters with more than 4 channels can be used. This allows the Jump Jet to be flown with computer radios.

Transmitters with the popular JR channel sequence can be used - the sequence is detected automatically when the transmitter is switched on.

The throttle throw is enhanced, boosting climb-out performance. This is helpful because many transmitters have smaller electrical channel movements than the Jump Jet's infrared handset, causing the throttle to feel rather sluggish. But please note that the Futaba Skysport radios have such short throws that climb-out is poor even after the upgrade - we do not recommend using them.

The directional controls are also boosted, making the aircraft more responsive in flight. This permits a greater variety of manoeuvres to be carried out, and allows the plane to be flown in higher winds.

If you would like to benefit from the software upgrade, please contact us at support@snelflight.co.uk to arrange to return your Jump Jet to us. Please do not return it to us without contacting us first. Once we have received it we will notify you so that you can purchase the upgrade service from our web site. Please note that a shipping charge will be added to the cost.

PLEASE NOTE: We regret we are not able to supply Jump Jet with pre-installed RF module.

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