Notices
RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

Rx and Tx compatability?

Old 02-17-2005, 11:50 PM
  #1  
WMB
Thread Starter
My Feedback: (1)
 
Join Date: Oct 2002
Location: Great Falls, MT
Posts: 931
Likes: 0
Received 0 Likes on 0 Posts
Default Rx and Tx compatability?

Hi all, I've got a Hitec 555 reciever for use with a JR transmitter. If I change the crystal in the rx, will it work with my new Futaba radio? I'm confused on the neagative and positive shift.
Thanks, Mike
Old 02-18-2005, 01:24 AM
  #2  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 10 Likes on 10 Posts
Default RE: Rx and Tx compatability?

No it will not function with both Tx's. JR is positive shift only, Futaba is negative shift only And the 555 can be ordered with either shift to match your Tx and in this case your 555 is a positive shift version. Hitec has a version of the Supreme that is selectable for both shifts but the 555 is either/or.

John
Old 02-18-2005, 01:24 AM
  #3  
rccrazedman
My Feedback: (10)
 
Join Date: Jul 2004
Location: Schuylkill Haven, PA
Posts: 479
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Rx and Tx compatability?

Hitech and futaba both transmit in the negative shift modulation . the Jr and the airtronics transmits in the positive shift. you can use any hitech radio with futaba recievers , or vice verso as long as they are the fm recievers. the PCM you must use brand spicific.
Old 02-18-2005, 01:41 AM
  #4  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 10 Likes on 10 Posts
Default RE: Rx and Tx compatability?


[quote]ORIGINAL: rccrazedman

you can use any hitech radio with futaba recievers , or vice verso as long as they are the fm recievers. the PCM you must use brand spicific.
[/quote



Close but not quite: You may not be able to use just any Hitec FM (PPM) Rx with a Futaba Tx. All Hitec FM Rx's are manufactured in both positive and negative modulation shifts except the one model that works both shifts the Selectable shift Supreme (there are non selectable Supremes also). The problem here and you see this all the time is if you mistakenly order a positive shift version for a Futaba Tx or acquire say a used Hitec Rx. it may or may not be a negative shift version.

John
Old 02-18-2005, 12:46 PM
  #5  
WMB
Thread Starter
My Feedback: (1)
 
Join Date: Oct 2002
Location: Great Falls, MT
Posts: 931
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Rx and Tx compatability?

OK, great. My confusion is cleared up a bit now. I'm not going to try it, but I bet a - shift will shoot down a + shift on the same channel.
Thanks, Mike
Old 02-18-2005, 02:56 PM
  #6  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 10 Likes on 10 Posts
Default RE: Rx and Tx compatability?


ORIGINAL: WMB

I bet a - shift will shoot down a + shift on the same channel.
Thanks, Mike

Oh you Bet just as (aginst the popular misconception) AM, FM (PPM) and FM(PCM) modulation types are all capable of shooting each other down given sufficient duration of interferance.

There seems to be inroads being made with the so called smart Rx's that are capable of recognition of its Tx's footprint but this is very new for RC usage and the subject for a differant thread.

John[8D]
Old 02-19-2005, 09:12 PM
  #7  
rccrazedman
My Feedback: (10)
 
Join Date: Jul 2004
Location: Schuylkill Haven, PA
Posts: 479
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Rx and Tx compatability?

ok true true I did not mention the shift selectable receivers of hitech.

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.