Hi, I just bought a second hand Sanwa M11x and found I don't have FHSS2 capability. In the manual I downloaded it states I should have FH2/FH3/FHF3, but I have DS2/FH3/FHF3. It bound fine to my RX451 recievers, but I can't bind it to my cheaper 92524 FHSS2 receiver. I tried both DS2 & and FH3 modes... Has anyone else had this problem?

You can only charge a LiPo or LiFe battery at the nominal voltage, stated on the battery itself. So if you have a 2s/7.4V pack, as you do, the only voltage it can be charged at is the 7.4V (2s) setting. Same goes for 3s/11.1V, 4s/14.8V, etc. I'm sure you get the idea.

You can alter the charging current, in Amps, but there really is no benefit, apart from the time it takes to complete the charge. It certainly is not like older NiMh or similar, where a higher charge current might allow for better performance, with LiPo/LiFe the general rule is to never charge at anything above 1C. I say general rule, as I have a recent Turnigy pack which is perfectly ok to be charged at up to 5C, which would probably start a fire with most other 'normal' LiPo packs.

Don't forget to plug in the balance cable in the 2 cell balancing port on your charger. Charge your pack often as you want and never let it get much lower than 30% capacity as it can damage the cells. Best to charge as often as you like because LiPo/LiFe batteries will actually last longer and give more stable performance if charged often and not allowed to go flat or <30% capacity. Google LiPo battery technology or charging or go to MaxAmps.com or some other battery manufacturer's site and you will find a wealth of info about how to make best use of your LiPo's, how to not ruin them, etc.

Nope, just the normal FH2/FH3/FH3F on mine. I suggest contacting Airtronics Support as they are very helpful and answer support emails nice and quick whenever I've had reason to contact them. Hopefully they can help sort out this problem for you.

One thing to note though, you can only run 1 type of modulation so if using FH3 with your RX451, to use the other rx, if you eventually can get it bound to your tx, you'd have to go through the menus to change over the setting to FH2. And then again back to FH3 when you want to use the newer rx. Bit of a pain in the arse IMHO.

Know any site with calculators that can tell you much much amp to charge at and what voltage left in the battery not to go below <30%? so i can set my m11x to start beeping on low battery.

Im bit confused

Everything you need to know is written on the battery pack. Charging current should, in most cases, never exceed 1C. As for how to know when the battery is going flat, the easiest thing to do would be to simply charge it up every 12 or so hours of use.

I have, for all intents and purposes, the same battery as you, 2s/7.4V/2300mAh and I get at least 12 hours if I leave the LCD backlight on constantly. If I put it to the setting I normally use (off after 30 seconds), I get a minimum of 16 or 17 hours. As the M11x has an 'On Timer', easiest thing to do is just to reset the timer whenever you charge the battery, that way you always know how many hours it's being used for.

I just charge mine before a race day as there's no way it will ever go flat from bashing/practice coz I'd have to be out there till I got blisters for it to go flat.

As for the low battery voltage beeper, it is not possible to set your own voltage setting, it goes on at about 6V I think, can't remember the exact figure. But remember, it is beneficial to charge your LiPo packs often, so there's no real need for low batt alarms, etc. as you really should be charging LiPo's way before that ever has a chance of happening.

Used it today for 2hours 30mins. Currently at 7.9volts. I think it was 8.4volts to start with.

I just wanted to see how long the battery will last me on the controller, i got my back light option to be on all the time. So is there a volt the lipo go's to before i should stop it? I always charge my stuff every time after getting home but wanted to see what a lipo would last for thats all.

Not to sure what 1C means??, i charged the battery at 2amps yesterday, its 1amp per 1000mahs as the general rule??

Oh so on the controller the voltage warning thing is for the receiver batteries and not the controller batteries.

Yes and no... The low voltage warning beeper is for the transmitter but it is not user adjustable. I think it beeps somewhere near 6.6V, I know it is definitely 6.xV, just not sure of the exact figure (it's in the manual somewhere). The M11x also has a receiver low voltage warning which is user adjustable, I have mine set at 4.6V (or maybe 4.9, can't remember which I set it to and can't be bothered checking) but it isn't a beeper, it makes the receiver go into failsafe mode (which is only really of use if you've set the failsafe settings prior).

About the batteries, LiPo cells should never be allowed to fall below 3.0V I think (I used to know the exact figure but since my battery will never get anywhere near the cutoff voltage, I've since forgotten the exact voltage), therefore 6.0V for a 2s battery pack.

When charging a battery, the term 'C' is short for capacity, so for our batteries, 1C is 2300mAh, 2C would be 4600mAh, etc. At least that one is nice and easy to remember.

Just keep in mind that a LiPo or LiFe battery needs to be charged and then discharged to somewhere around 50% about 10 times before it will reach peak capacity and performance. So you might only get maybe 7 or 8 hours (I'm just guessing here) with the LCD on constantly for your first half dozen or so charges and you'll find the battery lasting longer with each succesive charge/discharge cycle.

Mine started beeping at 6.7-6.8v the other day. I emailed airtronics about my radio not having FHSS2 capability but they couldn't help me as I'm not from North America, just said it could be different due to region but couldn't confirm.
I did a little looking on the internet and found that jap-spec models may have only come with DS2/FH3/FHF3 modulation and so I've likely bought one that was sourced from Japan. Not a big issue, I have 3 FHSS3 receivers already, only need one more. My GF has an MX3X so she can use it or I'll just sell it.

Quick questions for the Airtronics crowd. Im getting back into RC and a lot has changed. I am looking to purchase the M11 or M11X. These requests are trivial so bear with me. I noticed on someones car that they had a very short receiver antennae that was kept under the body of the car and supposedly worked as good as the long antennaes. It was an Airtronics. Is this type of receiver available for either the M11 or the M11x? Next, I really dont care how fast my radio and servo set up is because my old M8 was plenty fast enough for my horrible drving abilities. Do I still need a digital servo? How can I use my old servos? I like the 2.4ghz synthesize system but I would like it with a short rubber antennae out the top rather than the side. is this only available on the M11X. Any help is appreciated. Thank you, G

I used to conceal my antenna under the body shell when I initially used 2.4 for the novelty. But now I use a tube and get it outside the body as far a possible. I guess it's better to have it away from everything else, for the sake of a harmonious relationship between the other 4 electrical units in the car. Though it never caused a problem in stealth mode under the body.

M11X is a great radio and lighter than the M11. I was very happy with mine.

Someone else can confirm this, but I believe you can only use digital servos with the M11X and 451R receiver.

I also thought that only digital servos are able to be used. Just check the manual, then you'll know for sure and save yourself a blown servo or rx, in case there is some major incompatability between the 2.

Why would you even want to run ancient analog servos on an awesome radio like an M11/M11x? Seems an absolute waste to spend the big bucks on M11(x), RX451(R) and then skimp on the servos. Servos are so cheap these days, even more so if you buy 2nd-hand. Seems rather silly to me to use analog servos in this day and age, especially with an absolute top-of-the-line radio as there are so many benefits to be gained from running digital servos (even discounting vastly increased speed and response, digital are still very beneficial versus analog servos).

Not sure if this is what you're referring to but here's a pic of my M11 with Spektrum module and tiny, 30mm short, hard-wired aerial. BTW, it's for sale with 3s LiPo, 3 receivers, etc. if you or anyone else is interested.

Indeed, a bit strange. Top line radio with no care for the servos. I guess trying to ease back into the hobby. I'd just go with new stuff myself and enjoy to the max.

Grant, have you looked at the Airtronics MT4? It would be perfect for you. The TX antenna is neatly mounted into the top carry handle. It has a heap of features. Easier to use menu. It's lighter. To me it feels just as great if the not the exactly same as the M11X. The big bonus is that it comes with x2 servos and is cheaper than the M11X.

I dont need no stinking Digital servos. lol M11X or 4pks? Whatcha gonna do? hehe

Obviously that's a trick question...

Be careful and remember that saying... All the gear and no idea.