Log in to My Spektrum Get easy, online access to your Spektrum™ software updates, product registration and personalized settings.

X9503 2.4 A/S Tx with R921 Receiver No Servos MD2



*at participating retailers See similar products

X9503 2.4 A/S Tx with R921 Receiver No Servos MD2

Item #: JRP2930


Retail: $849.99*

Find a Retailer Buy Now *Avaliable at participating retailers


Key Features

  • 3-year warranty
  • 50-model memory
  • Throttle timer start up
  • ModelMatch
  • Spektrum DSM 2 2.4GHz RF link
  • Proven JR 9303 transmitter programming
  • Back-compatible with all Spektrum receivers
  • Now includes backlight screen

Product Specifications

# of Channels:
Model Memory:
Mode 2
Transmitter (Tx) Battery Type:
1500mAh NiMH installed


Combining Spektrum’s industry-leading 2.4GHz DSM® technology with proven JR 9303 transmitter programming with optimal features creates this impeccable radio. Additional features such as 50-model memory, ModelMatch, and being back-compatible with all Spektrum receivers make this model a great value. Furthermore, the highly requested throttle timer start-up feature added to the advanced functions of the X9303 and a backlight screen also increase visibility and readability on the display and provide top-of-the-line features to this already great radio. Enthusiasts can appreciate this JR radio regardless if a beginner or experienced hobbyist.

Manuals and Support



Product Bulletin: If your X9503 transmitter has the following Product Identification (PID) TH912J, TH912CM then please follow the instructions below.

Product Identification (PID) codes can be found on the inside of the battery compartment of your X9503 transmitter. If your transmitter does not have TH912J or TH912CM PID, then no further action is needed.

X9503 PID

In late January 2010 Horizon Hobby Service Department discovered 2 software issues in X9503 transmitters with TH912J or TH912CM Product IDs (PIDs). The first issue affected the “AUTO LAND” function in the ACRO model type this affects the function of the Flap System.

The 2nd issue Service Center discovered affected the Model Match for models 31-50 when binding and saving new models into memory.

JR Japan has provided Horizon Hobby with a software update to correct these issues. This software update can only be performed by Horizon Hobby’s Service Department authorized Technicians.

If your X9503 has the TH912J or TH912CM Product ID (PID)

  • Click here to complete the JR X9503 Return Request form.
  • You may also e-mail the Horizon Hobby Support team. Please type “X9503 Return Request Form” in the subject line. Please include your shipping address, daytime phone number, and the date code from your JR X9503 transmitter. Click here to email product support.
  • Horizon will pay for all ground shipping.
  • If you have further questions, please call Horizon Hobby Product Support at 877-504-0233.
  • Consumers outside the US and Canada should contact their local retailer or distributor. A list of International distributors may be found at: www.horizonhobby.com/StoreLocator.
  • As with all R/C aircraft, please check your transmitter and equipment prior to each flight.
  • Horizon Hobby and the JR team apologize for this inconvenience.

Technical Notes

The included 1500mAh transmitter battery is not available seperatly. Please see optional accessories for alternative batteries.

Related Parts

Parts Listing  See All

  • Tx Antenna Assembly: X9303, X9503, 12X[JRPA164]

  • []

  • []

  • []

Optional Accessories  See All

  • Throttle Ratchet,10,10S,347,388[JRPA635]

  • Smooth Ratchet,10,10S,347,388[JRPA636]

  • JR DSM Double Pro Transmitter Case[JRPA710]

  • JR DSM Double Pro Transmitter Case Foam Set[JRPA710F]