Radio Question????

[shockflyer]

I was wondering, I have a 9CAP Super and it is PCM/FM and I know it is for Air. If I convert it to 2.4GHz can it be used for air and surface? or is there a difference between the air and surface 2.4?

Thanks

Joe

 

[piper_chuck]

Yes, if you convert it to 2.4 it can be used for air and surface. There are a couple differences. First, you'll have to use compatible receivers, the typical 3 channel FASST receivers won't work a transmitter with so many channels. Also, the battery voltage failsafe on the plane receivers is setup for 4 cell batteries while the surface FASST receiver battery failsafe voltage is set for 5 cells.

 

[Bill-SOCAL]

Also, the battery voltage failsafe on the plane receivers is setup for 4 cell batteries while the surface FASST receiver battery failsafe voltage is set for 5 cells.

I need to confirm this, but it is my understanding that the battery failsafe voltage for all Futaba systems is around 3.8 volts.

 

[piper_chuck]

Also, the battery voltage failsafe on the plane receivers is setup for 4 cell batteries while the surface FASST receiver battery failsafe voltage is set for 5 cells.

I need to confirm this, but it is my understanding that the battery failsafe voltage for all Futaba systems is around 3.8 volts.

Confirm away. The R603FF and R603FS require 6 volt batteries. Waiting until a 5 cell battery pack went down to 3.8 volts would sorta be a problem. The manual for the 3PK FASST module and R603FS receiver lists the battery failsafe voltage cutoff as 4.75 volts.

I saw references to being able to set the voltage for the R604FS, but I didn't look into the details.

I happened across additional failsafe subtleties.

The the 6 and 7 channel systems only have one failsafe channel, the throttle. I think there are additional failsafe channels in the higher channel systems, but since I wasn't looking at them I didn't check.

The transmitters in the 6 and 7 channel systems also broadcast failsafe information on a periodic basis, meaning you don't have to do anything special once you've got failsafe setup in the transmitter. I think the same is true for the 8 and 14 channel FASST modules, but again, I didn't check the details. Contrast this to having to push a button on the back of the transmitter when using the R603FF and R603FS in PPM mode, which is required if you use non-digital servos.

 

[Bill-SOCAL]

Well like I said I was not 100%. My 3PM manual does not mention a cutoff voltage. And ALL FASST systems are recommended for 6 volts. I know that the 6EX through 14 MZ FASST system uses 3.8 volts. In fact it has been documented that the FASST receivers will not actually reset until 3 volts or so. Go figure.