DSM2/DSMX transmitter module for A9/Optic 6/Prism 7 - RC Groups
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This thread is privately moderated by hammer22, who may elect to delete unwanted replies.
Aug 14, 2012, 11:01 PM
Trader Rating: 28
Registered User

DSM2/DSMX transmitter module for A9/Optic 6/Prism 7

9/3/2012: I have updated the firmware in the module to work correctly with the Hitec Aurora 9 transmitter or any transmitter with up to a 32ms frame rate. This update was flight tested with an A9 this past week and everything is working. All other specifications remain the same. I have 4 of these modules for sale right now and will be building more in the future. I also added a picture of how the module looks installed in an A9.

I am selling four (4) three (3) custom made 100% DSM2/DSMX compatible transmitter modules for use with Hitec Aurora 9, Optic 6, Prism 7 or other module based Hitec radios. These modules are 100% completely DSM2 and DSMX compatible and are able to transmit in either the original DSM2 protocol or in the new frequency hopping DSMX protocol. Switching between modes is quick and easy using the transmitter throttle stick and the bind button on the module. I am asking $85 shipped to CONUS (USPS first class w/delivery confirmation). I will ship internationally for $10 via USPS first class mail.

Disclaimer: This is not a Spektrum brand module and does not contain any Horizon Hobby or Spektrum parts. This module is custom designed with custom firmware and built using a 2.4GHz RF module based on the proven Cypress CYRF6936 2.4GHz DSSS radio chip, the same RF chip used in all Spektrum radio equipment. This same RF module is used by another popular RC radio equipment manufacturer in their FCC certified transmitters.

This module is a proprietary design, hand made, using only high quality components and thoroughly tested.

This module is 100% functionally equivalent to the popular Spektrum DM8/9 module and just like the original Spektrum DM8/9 modules, it converts your transmitter to DSM2. But this module has the added ability to transmit in DSMX mode too!

This is a full range module with an average RF output power level of +20dBm.

This module is designed to accept up to 9 PPM channels. It is configured for the Hitec/Futaba channel order (A.E.T.R.). It will re-arrange the channels to match the JR/Spektrum channel order (T.A.E.R) thereby making your Hitec transmitter able to control the popular Bind-N-Fly micro aircraft.

The firmware in this module has been extensively tested with a wide variety of DSM2/DSMX Spektrum receivers including the AR6400 micro brick RX used in the popular Eflite and Parkzone micro aircraft, AR400, AR600, AR7000, AR6110, AR8000, AR9000, AR6210 and HK Orange 6 channel receiver. It performs every bit as well as an original Spektrum module.

Key Features:
- Protocol - DSM2 or DSMX mode.

- Easy to switch between modes using throttle stick and bind button.

- Compatible with any DSM2 or DSMX receiver, including DSM2/DSMX Bind-N-Fly micro aircraft and helicopters and the Hobby King line of Orange DSM2 compatible receivers.

- Resolution - DSM2 - 10 bit. DSMX - 11 bit.

- Maximum number of channels transmitted: DSM2 mode: 9 channels. DSMX mode: 7 channels.

- RF output power: +20dBm.

- Power input voltage range: 5 - 15 volts.

- PPM signal voltage: 5V to 12V

- Exact fit Hitec transmitter case for correct fit in Hitec module based transmitters.

- Informative status LED that does more than just tell you if power is on.

- 14 day money back return policy if not satisfied.

Some buyer comments from my JR module:

Bob Y., TX:
Flew my new Beast BNF today with your module. Binds fast and works great. Can't attest to range as I'm flying a micro size plane and keep it close in. The range check was great, went out past 40 paces on low power with no problems.

Roy L., NJ
I flew your module in a JR 8103 tx today in dsmx mode. It was an E-Flite Taylorcfaft, Park 480 motor, Spektrum 7010 rx. Ground checking @ 30 pacesin low output & walking all around the plane was solid. I had five perfect flites. No issues at all. flew the plane as far out as I could see. Please note that there was another fellow flying spektrum dsm2 @ the same time.

Mathew F., CA:
I have tested your transmitter module and it works flawlessly with the micros I fly.  Haven't really tested it long range with these little planes, but it's perfect for what I needed.

Please PM me if you are interested.

I also have three (3) JR type modules for sale for the same price. Please see the following thread for more info: https://www.rcgroups.com/forums/show....php?t=1669239

The fine print:

Added 8/16: The Aurora 9 needs to be in PPM-N or PPM-P mode.

The antenna is not able to pivot side to side but it does move up and down on the 90 degree elbow. Please do not attempt to force the antenna to move side to side.

The cases I used had to be rewoked a bit to fit the electronics inside. As a result, a few cases have a blemish around the bind button or the hole may be a bit large. This is only cosmetic and does not affect operation.

Though not tested as yet, this module should also work in Futaba module based radios as they use the same size module case and have the same pinout as older Hitec transmitters.
Last edited by hammer22; Sep 03, 2012 at 01:27 PM.
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Aug 14, 2012, 11:20 PM
Trader Rating: 95
Registered User
Cool idea - neat way to update some nice older radios!
Last edited by fizzwater2; Aug 15, 2012 at 08:16 AM.
Aug 15, 2012, 03:33 AM
Trader Rating: 21
most exalted one
Futaba pins are on opposite end of the module space. That is why Hitec came out with a promo module and similar antenna to yours that rotates 180 deg. Also I believe that would be the other reason Hitec's standard 2.4 module is linked to the antenna with coax. You could in future?? mount a coax connector like XPS on the module and then screw in the antenna to the module, or is that what you have done?
Interested but a little hesitant .
Last edited by 4*60; Aug 15, 2012 at 03:57 AM.
Aug 15, 2012, 06:21 AM
Trader Rating: 28
Registered User
No these modules do not have FCC type acceptance. But the RF module inside is used in a well known RC manufacturers radios and those radios do have FCC acceptance.

These cases are the Hitec promo module cases. Unfortunately, there is not enough room inside the case after I put my electronics package inside to mount an SMA antenna connector. I would have liked to do that though but space was too tight. I suppose I could use a fly-lead to an external antenna but the antenna would not be detachable and it would leave a large hole in the case where the original antenna was mounted. The antenna is permanently mounted to the case and is not detachable from the module. To pivot it around 180 degrees for use with Futaba radios, the case needs to be opened, a nut loosened, the antenna pivoted, and the nut re tightened.
Aug 15, 2012, 11:33 AM
Trader Rating: 21
most exalted one
Thanks for the info. It's clearer now.
Aug 26, 2012, 09:29 PM
Trader Rating: 28
Registered User
I've been away on vacation this past week and am trying to get caught up. But I have an unfortunate announcement to make.

I have to suspend selling the A9 modules as I just discovered that they will not work in the A9. The reason is that the PPM frame rate of the A9 is actually 23ms, not the 21ms that has been claimed elsewhere on RCGroups (this was on an A9 using firmware version 1.08). I installed one of my modules on a club members A9 today and saw that it would not work with an AR6210 DSMX receiver. I checked the PPM signal with my scope and saw the 23ms frame rate. The frame rate of the radio determines the frequency at which data packets are sent and most Spektrum receivers stop working when the frame rate gets above 22ms. I really apologize for this screw up but I will make it right. I have sent individual messages to everyone who has purchased a module so far but I will ask again here: If you have purchased a module for use in an A9 radio, please return it to me and I will refund you money plus the postage to send it back to me.

This issue is only apparent with the A9 radio. This issue does not affect the JR version of the module as JR radios have frames rates in the 20-22ms range.

I will need to rework the firmware to fix this issue and will post another classified ad when that happens.
Sep 04, 2012, 10:33 AM
Trader Rating: 28
Registered User
I'm going to close this thread and start a new classified ad as I don't see a way to change the status from Sold back to For Sale.

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