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Non-Warranty Repairs

Should your repair not be covered by warranty the repair will be completed and 

payment will be required without notification or estimate of the expense unless the 

expense exceeds 50% of the retail purchase cost.

 By submitting the item for repair you 

are agreeing to payment of the repair without notification. Repair estimates are available 

upon request. You must include this request with your repair. Non-warranty repair estimates 

will be billed a minimum of ½ hour of labor. In addition you will be billed for return freight. 

Horizon accepts money orders and cashiers checks, as well as Visa, MasterCard, American 

Express, and Discover cards. By submitting any item to Horizon for inspection or repair, you 

are agreeing to Horizon’s Terms and Conditions found on our website under the Repairs tab.
Electronics and engines requiring inspection  

or repair should be shipped to the following address:

Horizon Service Center 

4105 Fieldstone Road 

Champaign, Illinois 61822 

USA

Online Repair Request visit:

www.horizonhobby.com/repairs

All other Products requiring warranty inspection  

or repair should be shipped to the following address:

Horizon Product Support 

4105 Fieldstone Road 

Champaign, Illinois 61822 

USA

Please call 877-504-0233 with any questions or concerns regarding this product or warranty.

FCC Information

This device complies with part 15 of the FCC rules. Operation is subject to the following 

two conditions: (1) This device may not cause harmful interference, and (2) this device must 

accept any interference received, including interference that may cause undesired operation.

CAUTION

: Changes or modifications not expressly approved by the party responsible 

for compliance could void the user’s authority to operate the equipment.
This product contains a radio transmitter with wireless technology which has been tested  

and found to be compliant with the applicable regulations governing a radio transmitter  

in the 2.400GHz to 2.4835GHz frequency range.

Printed: 2/11 

© 2011 Horizon Hobby, Inc.  

US patent 7,391,320. Other patents pending.

10901.4

Summary of Contents for R921X

Page 1: ...JR R921X Receiver User Guide...

Page 2: ...t disassembly use with incompatible components or augment product in any way without the approval of Horizon Hobby Inc This manual contains instructions for safety operation and maintenance It is esse...

Page 3: ...ime During these tests each of the 100 systems was monitored in flight and on the ground In every test not a single case of RF link loss latency increase or control degradation was experienced or reco...

Page 4: ...70mA Voltage range 3 5 to 9 6V Installing the R921X Receiver The R921X incorporates dual internal receivers and one or two remote receivers offering the security of up to four simultaneous RF links fo...

Page 5: ...erally enough room on the servo tray to achieve the necessary separation If space is limited a mount can be made using clear plastic to mount the external antenna R921X Binding Instructions The R921X...

Page 6: ...ve the bind plug and store it in a convenient place 5 After you ve programmed your model it s important to rebind the system 6 so the true low throttle and neutral control surface positions are progra...

Page 7: ...safe positions are stored in the receiver during binding At this time the throttle channel has no output to avoid operating or arming the electronic speed control In glow powered models the throttle s...

Page 8: ...r hold your aircraft while he observes the Flight Log data 4 Standing 30 paces away from the model face the model with the transmitter in your normal flying position and depress and hold the bind butt...

Page 9: ...en 45 continuous one right after the other frame losses occur This takes about one second If a hold occurs during a flight it s important to re evaluate the system moving the antennas to different loc...

Page 10: ...ay not be able to maintain voltage at significant power levels 4 For really large aircraft or complex models for example 35 and larger or jets multiple battery packs with multiple switch harnesses are...

Page 11: ...Horizon directly This will enable Horizon to better answer your questions and service you in the event that you may need any assistance For questions or assistance please direct your email to products...

Page 12: ...nter 4105 Fieldstone Road Champaign Illinois 61822 USA Online Repair Request visit www horizonhobby com repairs All other Products requiring warranty inspection or repair should be shipped to the foll...

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