R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric Off-Road

Thread Tools Search this Thread
Old 09-03-2005, 08:31 PM   #1
Tech Adept
Join Date: Oct 2004
Location: Dallas, TX
Posts: 145
Default Associated receiver and JR XR2i Radio

I'm trying to get an RC18T to work with my JR XR2i 27MHz radio, with a Mamba system, Aitronics servo, and Associated micro 27MHz receiver. Both receiver and radio are 2 channel.

I get no response when using the Associated receiver. No steering, nothing. I took the R125 receiver from my XXX-T and tried the steering and speed control in it. I got full response from everything. Does anyone know why the Associated receiver does not work period, with my radio?

I know at this point, it has nothing to do with the battery power, since it works fine with the r125 receiver. The servo, ESC, and motor all work fine too. This is proven by working with the r125 receiver. I have not tested the receiver in my Losi yet. I guess I could do that. Everything points back to the Associated receiver. Could it be the wiring on the devices? Do I need to change them? I cannot find a manual for this receiver so I do not know what to do at this point.

Thanks for any help provided.
briansid is offline   Reply With Quote
Old 09-08-2005, 11:52 PM   #2
Tech Addict
crazyjr's Avatar
Join Date: Jul 2005
Location: middle georgia
Posts: 613

Won't work, you need a Jr 27mhz recieveror a AE 27mhz transmitter
crazyjr is offline   Reply With Quote
Old 09-09-2005, 02:04 PM   #3
Tech Adept
cpolaris502's Avatar
Join Date: Jun 2005
Location: Rogers MN
Posts: 102
Trader Rating: 2 (100%+)
Send a message via AIM to cpolaris502

are they on different frequencies?
cpolaris502 is offline   Reply With Quote
Old 09-09-2005, 07:41 PM   #4
Tech Adept
Join Date: Oct 2004
Location: Dallas, TX
Posts: 145

I figured out what's going on. There are some companies that are compatible with other manufacturers and others that are not so compatible. JR is is one of the not so compatible ones.

In my search for more wisdom I have discovered that there is a negative shift and a positive shift in radio frequencies for the same band. For instance, JR uses a positive shift, where as most others use a negative shift. It doesn't matter if all parts are the same 27MHz or 75MHz band. If one part has a positive shift and the other has a negative shift, then they simply won't communicate. The AE receiver is made by Hitec which uses a negative shift on the 27MHz band, while the JR radio also uses 27MHz, but on a positive shift. The two devices will never communicate, because they are on opposite sides of the 27MHz band. That is my problem. The Airtronics receivers use the same positive shift that JR equipment uses, so they are compatible. Hitec and Futaba use the negative shift and therefore will not work with JR equipment.

Here's some information to back it up.

I think more manufactures are going to a dual shift now. That way their equipment will work with just about anything else on the market. I don't know why they are waiting until now.

Now you have the knowledge
briansid is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
JR XR2I computer radio with a R125 receiver extreme-rc Australia For Sale/Trade 4 01-23-2008 09:24 PM
FS: JR XR2i AM Radio with receiver. cheap. xxx-ntad2 racer R/C Items: For Sale/Trade 5 02-12-2007 03:02 PM
FS: JR XR2i AM radio with receiver xxx-ntad2 racer R/C Items: For Sale/Trade 12 02-06-2007 05:50 PM
JR XR2i Radio, Novak XXL Receiver for sale! SeattleRCer R/C Items: For Sale/Trade 6 08-17-2005 01:23 PM
JR XR2i 27mhz AM radio/receiver redrider R/C Items: For Sale/Trade 25 02-16-2005 06:54 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 02:56 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net