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Mark, you are quite right, the more modern receivers only give out about 3V. Also the later failafes such as the Ripmax Extra only give out 3V. The old faithful FS-1 can be used to boost the 3V signal to 4.8V so these could be used with older interfaces (most likley incorporating opto isolation) that do not work with 3V signals.
Hello everyone
I have the new 2.4 fasst and the old t6exa
the later i have never had any problems with (except more and more interference)
After trying lots of tips etc I found the fasst will not work with old style interfaces
it has now been tested with a watty speed
controller and they work perfectly, but there
is only failsafe on the 1 channel,
the t6exa went into failsafe on all channels.
I am a bit stuck what to do now I dont really
want to add relays etc from channel 1 to remote
cut the robot,
unfortunately channel is the one i use for throttle on the left stick so I would have to
learn a different driving style, unless i can
change the transmitter around inside.
I have also wondered if it is possible to use a normal failsafe 10 amp relay connected to channel 1 so when this goes into failsafe
it cuts the pulses from the reciever to the speed controll/weapons etc on theother channels ?
The only solution I can think off is to swap the pot leads over inside the transmitter thus putting the failsafe on a spare channel.
Id then go the RC switch and remote relay route off of this spare channel and use it to cut all mains battery power....remembering to still leave the BEC or RC battery connected.
A bit of info that might help on the combatability issues.
Futuba in their think tank decided to make the servo pulse voltage 2.76v. Now this is fine if you just use Futuba servos. But most other servos are designed to operate at from 3 to 5 volts on their servo pluse voltage.
So the Futaba FASST seems to have the same voltage issues as the Spektrum...scroll up the thread for the possible FS1 Failsafe solution.
It also outputs a different pulse range to std.
I set the End Points on channel 1 (my test channel) to 140%
Then I measured the pulse using the HiTec programmer:
945 - 1521 - 2096
Normally we expect something close to:
900 - 1500 - 2100
(Message edited by woody on March 11, 2008)
I have now used the futaba 2.4 ghz fasst
at burgess hill,
I have chanell 3 (failsafe) connected to remote
kill on wy watty and also a battle switch,
therefor when i loose tx signal the rx turns off
the watty and my battle switch.
I have then got a 2nd battle switch connected to
chanell 6 for my flipper
(the solonoid supply runs through both battleswitches) so if 1 of them is off then my
solonoid is closed.
This all worked perfectly,
no interference to the battleswitches, and also
no large relay systems
power for receiver and battleswitches is taken
from the watty.
Terry.
Oh and I have also got my receiver in a little
metal box (rf) as im not taking any chances,
and my 2 antennas are taped at 90 degrees to each
other on a plastic case, this did make a difference there was some twitching when they werent at 90 degrees.
Terry.
I have just got one of the new Futaba 10C 2.4 GHz sets. 10 Channels, with settable (in the transmitter menus) failsafe on the first 8 channels.
http://2.4gigahertz.com/systems/futk9250.htmlhttp://2.4gigahertz.com/systems/futk9250.html
Not quite as flexible as my 9z (e.g. no easy stick-channel assignment), but nice.
For info, the pulse output on the receivers is unusual on these (apart from being only 2.8 Volts and with a frame rate of 72 Hz):
The pulses on the first six channels are all sent simultaneously. This is for the benefit of the helicopter boys - ensusures that multi-servo swashplates move straight up and down with no swimming.
The pulses for channels 7,8 and 9 then are also simutaneously, 3ms after the first group (rising edge to rising edge is 3ms). 10 is then another 3ms behind.
Our Wotty for some reason wouldnt work properly when connected to channels 1 and 3 in the usual manner. But works fine on channels 7 and 8. Not sure why yet.
John
John,
Ive looked at the 10c sets and they look an awsome bit of kit, will be interested to see how you get on with setting up etc.
Does your battle switch weapon rf relay work ok on the pulse rates ?
Terry.
I have built my own switch, which works fine with the 72 Hz pules put out by the receiver.
Found out that with the Wotty needs to have the enable channel connected to a different group of channels than the steering and throttle. So Channel 1 for steering, Channel 2 or 3 for throttle and channel 7 for enable works fine.
Very nice to setup with English words for all the menu items, rather than TLAs. Ive set it up with different steering rates (including exponential) for the steering on a three-position switch, and different rates for the gyro, also three position.
Used it at the champs - worked perfectly.