I see that Graupner has just come out with a 2.4 module system for their radios. Does anyone have any technical views on this system? Is it an adaptation of the JR/Spectrum system used here in the states or is it something else?

I have been considering buying a plug in system for my MX22.

It's an adoptation of the XPS system (Extreme Power Systems).

The Graupner IFS system IS the XPS with a slightly different sticker on the top surface. XPS builds those for Graupner.

BTW, many many flights and ZERO issues through both Jim (aka Jascat) and myself.

Chris

There has been some bad press on this Xtreme XPS system, a few guys have lost top dollar models and from what i can remember one Jet guy had so much grief he went back to 72MHz.

I dont believe its "NEW"...been around for some time but some real bad reports about loss of control may have dragged it down.

There are some comments on other forums already regarding the problems with it.

Brg

Dave.

It's all in the battery redudancy and how much current draw there is. If your voltage goes below 3.7 then the receiver resets itself up. Just like the problems some others have had with the Spektrum. BTW, I have both systems and am very please with how both are performing.

Chris

P.S. Graupner would not invest a penny in something that is not good to sell. They WILL NOT put their reputation at risk!!!

Battery is an issue but not the only issue with xps!!! Do a search and you'll find quite a bit more..

I don't know about others and their problems.....I know about myself and Jim, who have been flying the XPS for the past year (all year round) with no issues whatsoever. Jim puts about thirty flights every weekend on a number of his jets (Avonds F15, Falcon120, bobcat50, AD Scorpion,, JLF16, Comp-Arf Rookie, to mention a few) and I put one third of his. We fly the Cr&p out of these jets and we never even had a single glitch. As I said earlier, I also fly the Spektrum in my SM F15 and before that in a Jetlegend F15 with total success. So, I am not trying to convince anyone to choose one system over the other, I merely state facts and yes, I have read about other peoplele's issues, but I haven't seen their setup, nor I have been witness to what happened when they crashed.

Chris

Unfortunately, I have..

I'm sorry to hear that. I know how it feels. []

Chris

Hmm interesting, Because XPS inventor dragged his feet for two years US market claiming he could not get plastic module housing from Horizon, all the while he was secretly working with Graupner. .02

The Graupner 2.4G is not new I seen the German adds over a year ago. I also asked JEff H from Team JR at a early spring event if Graupner was using licensed Spektrum, he said no and made no comment as to what they were using.

The XPS creator has a long history of contraversial subject matter of the design claims on RCGroups/Runryder as well as RCU, Given the guys tactics to enter the market alone is enough for me to put his system last in line.


FWIW
XPS was also onsight at a recent Las Vegas electric event during weekend of 60th anniversary Airshow Airforce, They watched in horror as an XPS equipped Ducted Fan system flew out of site WOT straight an level. Never to be found. spextrum also went down in fairness and No one could verify to me an actual FASST going down. That event is about to get cancelled as taboo as a violent RF enviroment. The club is on a fact finding mission to documnet all problems from real pilot data input only, no My buddies second hand info. I'm awaiting their findings. The XPS guys had a Freq analyzer and said the airwaves were ablaze, speculating the Air Force was bombarding all radio freq out to Area 51, ....who knows. but interesting reading none the less. Do your own search, XPS is a very contraversial supplier of 2.4G

Guys

Been testing the Graupner system today in a Quarter Midget type pylon model, I could fly as far way as I could see at 3 feet flat out up wind and down wind.
The Rx is mounted side ways in the small fuselage with the aerial horizonal.
I'm sure that the installation of the system is more critical but so far everything seems to be fine.

Dave Wilshere

I have been flying with the XPS system for about a year. I have it installed in six jets. I have had no issues in the countless flights made.
I make sure the Rx is mounted well away from any wiring & any loose wiring that could come near the Rx is secured.
Graupner are the European agents for XPS. As far as I know they only sell the product & have no connection with its production.

Dave, your luckier than me, lost a 50E Sukoi on a maiden to this system. Spent hours on the range checks etc, by the book, all went according to plan - except the flight that is........[>:]

Beware!

I'm sorry to hear about the problems.

I was hoping to get a Graupner 2.4GHz module for my trusty old JR PCM 10X as its one of the few modules that gives 10 channels ?
Would have been cheaper and quicker than waiting for the JR PCM12X.

What to do, WHAT TO DO ?

Sure, but they DO label the system with "Graupner"...

They Market it as "Graupner IFS System". This means that they are fully backing it up with their own brand fame.

Chris

The only way you get 10 channels is if you gang two in the reciever. The Transmitter only sends 9 on PPM

The wait should be worth it anyways, The problem with moduled 2.4G on older sets is that they process the PPM side of the TX then digitize, then send out to model. This actually takes longer than a straight PPM signal but shorter than the PCM mode of said TX.

Now the new 12X 2.4G module based is advertised as speeding up, EVEN the PPM side so that it equals the 2.4G TX latency ,,,

WOWW this is huge, so now when you buy that radio and put in your old 72mz modules even all your old PCM recievers are going to be even faster response than days of old. The 12X module based has get to be the best of all worlds and I am thrilled Horizon thought this thruogh to this extreme as it truly will have no equal..............

You get ten channels on a Graupner MX22

Chris

Actually, you can select either 10 or 12 in PPM.

Paul

Chris, care to explain what " FULLY BACKING " means? I ask because if it means what I think it means I will buy the IFS system right now as it has arrived here to the US from Germany and I have access to a complete set the minute I say "GO" but there's a big BUT...

I've been using Graupner MC-24 now for 8 years and I absolutely love it. I'm now extremely concerned about jumping to its new 2.4 system due to everything I'm reading and I really would hate to completely drop Graupner over another product.


Thank You!

All I am saying is that Graupner will not sell something as their own if they have not done their homework first. They do sell Spektrum stuff (check it out on their website www.graupner.de), but they do not call it "Graupner Spektrum"


Chris

Hi,
I am sorry for my bad english language...
I have problems with the combo Graupner iFS... for my mx-22[&:]
After 10 minutes of operation the RX heats, she jams and any connected servos doesn't work.
Turning off and turning on the system TX and RX they don't bind him, it needs to wait at least 30 seconds because to bind.
I was effecting her first earth tests with the RX installed on a model without engine.
I have effected different tests both with the connected servos is without connected servos and the result it doesn't change, after around 30 second of use the RX heats especially in the inferior part of the case; I have connected a temperature probe on the case and after 30 seconds the temperature it reaches the 42-43° C.
I have used batteries Duralite LiMn 2S 3.800 mAh. connected through a regulator Duralite 5.1 V., batteries Sanyo NiMh 5 cells 6.0 V., Futaba, Hitec e GWS servos.
I have wanted to make other two tests...
I have turned on the alone RX, the TX was turned Off, first fed to 5.1 V. (Duralite Regulator) and then directly with a Duralite LiMn 2S 3.800 mAh to 7.4 V.
The RX heats however, after 10 min. of operation the thermal probe has marked 40° C. with the tension of 5.1 V. and 50° C. with the tension to 7.4 V.
Incredible...
The RX jams when it heats while when it is cold it perfectly works.
I have Effected a nth test...
I have used a damaged package batteries that at the most it gave 5.0 V. almost immediately gone down to 4.8 V.
I have left him connected to the RX for over a hour, the display of the digital battery voltage monitor has come to read 3.76 V.; everything has gone smooth as the oil, the RX has not heated.
In all sincerity I have to say that to the beginning the servos for some instant have started to go for their account and extinguishing and relighting the system the alignment is not gotten but the thing has lasted only some second.
I have repeated the test and when I have noticed that the servos began to go for their account I have had a strange idea and I have removed the antenna from the module; the servos have started over correctly working and so they have also continued after having put again the antenna at the module..
I don't know however if the resumption of the correct operation were to attribute to the lack of the antenna or to the tension of the batteries of the RX that kept on going down.
Certainly it is that the RX feeding to low tension, 3.6-4.8 V. everything has been all right and I has not found any malfunction.
Then I have contacted Jim Drew of the Xtreme Power Systems through his Forum of assistance ( [link]http://www.rcgroups.com/forums/showthread.php?t=777314[/link]) and him has recommended me to return the RX for the substitution.
Best regards

Am I missing something or did you power the RX with a 7.1V battery [X(] ?

XPS claims you can power it up to 36 volts...