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.

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.

RE: Older ESC's with 2.4 ghz
 

It seems that you have a lot of misinformation here:eek:
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

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.

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]