Notices
Brushed/Brushless motors, speed controls, gear drives Discuss all aspects of brushless motors, brushed motors, speed controls (ESC's), gear drives and propellers in this forum.

Older ESC's with 2.4 ghz

Old 04-13-2009, 02:46 PM
  #1  
donjiskra
Junior Member
Thread Starter
 
donjiskra's Avatar
 
Join Date: Aug 2004
Location: Darien, IL
Posts: 26
Likes: 0
Received 0 Likes on 0 Posts
Default Older ESC's with 2.4 ghz

I had a problem with my Electrifly SS-25 continuously beeping when it was installed in my new Airtronics 2.4 system. Electrifly Tech Support said to check with Airtonics.
Here's an interesting reply from Mike at Airtronics Tech Support.
"I have not used that esc with our system. However there are many older esc's that will not work with 2.4GHz radios.

Some major brands (I won't name names) had to quietly redesign ALL of their aircraft speed controls to work with 2.4GHz radios (not just ours, but their own proprietary brands)

The frame rate is much different on 2.4GHz and many esc's simply cannot work with that type of signal.

But, there could be other settings that are causing the problem that are simple to solve. For example, you may need to reverse that channel and/or turn up the EPA for throttle.

Mike



I tried Mike's suggestions but to no avail. Guess the SS-25 will be relegated to my older 72mhz system.
Old 04-14-2009, 02:17 AM
  #2  
Keithfl
Member
 
Join Date: Apr 2005
Location: Sydney, AUSTRALIA
Posts: 55
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Older ESC's with 2.4 ghz

Don't know about the frame rate being different, AFAIK 2.4 ghz still uses the standard 50ms frame rate.

What I do know is that the pulse signal from Futaba 2.4 ghz RXs is at a lower voltage than the FM/PCM systems used. Their 2.4 RX's have a pulse voltage of about 2.5v, compared to the more typical 4.0v+.

We had this problem with an old relay-type motor switch. Problem solved by putting an aftemarket (Medusa) opto-isolator between the RX and ESC. The opto-isolator was happy to accept a 2.5v signal, and generated a 4.0v+ signal that the ESC could use.
Old 04-14-2009, 09:17 AM
  #3  
pilotpete2
 
pilotpete2's Avatar
 
Join Date: Oct 2002
Location: Lyndonville, VT
Posts: 3,305
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Older ESC's with 2.4 ghz


ORIGINAL: Keithfl

What I do know is that the pulse signal from Futaba 2.4 ghz RXs is at a lower voltage than the FM/PCM systems used. Their 2.4 RX's have a pulse voltage of about 2.5v, compared to the more typical 4.0v+.
It seems that you have a lot of misinformation here
Where do you come up with a 4V signal? 3 to 3.3V is the standard signal level of modern receivers, as most seem to use a 3.3V voltage regulator coming off the receiver power buss.
The only FASST receiver that had the lower signal voltage was the R6014RF, the signal voltage was 2.7V, current revision brought it up to Futabas normal 3V level that is used on all other FASST receivers with no issues
Pete
Old 04-14-2009, 10:06 PM
  #4  
BigTb17
Senior Member
 
Join Date: Feb 2008
Location: Perrysburg, OH
Posts: 1,167
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Older ESC's with 2.4 ghz

I have an SS-25 speed control that I've exclusively used with 2.4 Ghz radios with no problems. I was originally using it with a DX6 paired with an AR6000 receiver, and have since used it with a DX7 and AR6200 and AR7000 receivers.

I don't really like the SS-25 for other reasons, but it has never had a problem working with my 2.4 Ghz radios.
Old 04-15-2009, 12:38 PM
  #5  
-pkh-
Senior Member
My Feedback: (2)
 
-pkh-'s Avatar
 
Join Date: May 2004
Location: Emmaus, PA
Posts: 3,354
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Older ESC's with 2.4 ghz

According to this RC Heli Magazine article (see link below), the RDS8000 has a frame rate of about 24ms. The DX7 has a frame rate of about 22ms (see second link below). Odd that this ESC works with the DX7 and not the RDS8000.

[link=http://www.rchelimag.com/pages/scopes.php?scope=23&page=2]RC Heli Magazine's RDS8000 article[/link]

[link=http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPM2731]DX7se brochure (see the standard DX7 frame rate under "Features" ) [/link]

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 - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.