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Old 04-21-2010 | 02:54 AM
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Default Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Hi y'all,

As a lot of people are still using FM/72 Mhz Technology including me, so I was wondering if anyone has any experience with Hitec's Supreme IIS 8 Channel Dual conversion positive shift ultra narrow band frequency Receiver/Rx? If yes, have you ever experienced any flutter on your plane, or any abnormal fluttering of your control surfaces like elevator and rudder?

Please let me know your experiences, good or bad, or any kind of glitches or abnormal functions.

I'd appreciate your response. and Happy flying


Mody
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Old 04-21-2010 | 07:37 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Mine work fine. Cheaper than Futaba stuff too.
Old 04-21-2010 | 09:55 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

It is a good solid receiver with excellent glitch and spurious noise rejection.

They are one of the most reliable and glitch free 72mHz receivers I own...
Old 04-21-2010 | 10:12 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

For many years it has been my Rx of choice and it has been the most bomb proof of my many others especially the more expensive and troublesome futaba 127's its competitor in the past.

Of course I have experianced All the various symtems you mentioned at various times. There is a whole lot more involved than just a RX in that. And yes reuseing crashed rx sometimes will have problem.

All up it remains my favorite of the 72's I just don,t buy them anymore now with 2.4.

John
Old 04-21-2010 | 10:35 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Also FLUTTER is NOT caused by the receiver.

It is caused by harmonic vibration of your control surfaces, usually brought on by excessive speed, or improper control surface retention.

On the Supreme Receiver the one you pictured also is shift selectable so it will work with just about any 72mhz PPM transmitter.

Old 04-21-2010 | 11:09 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

opjose, jester_1, JohnBuckner

Guys thank you very much for your input. I bought this receiver last month to use on my second plane Escapade, which I have mentioned from time to time. Escapade does not give you much room but the space for the receiver for alright next to servos. It's not bad, and receiver was wrapped by the velcro. Also like to mention that I'm using Electron 6 which is a predecessor of Neutron 6. I never had any single problem, as soon as I installed it on my Mustang, it's working fine, Thank GOD.

As I was mentioning about my Escapade, last Saturday, I had one maiden flight, some senior flyers were there, and control surfaces fluttered, while plane was up in the air, I needed to trim out aileron's mechanically, during flight, couple of times plane fluttered, I mean the whole plane, I landed it, took the next flight, felt the same thing, this time while I was trying to make a high pass, plane jolted very bad but it got stabled, I thought, I ain't gonna take no more risk, I'm gonna get this plane down, I made my landing approach, throttle was 25% or 20% open or 1/4, the plane came right to me suddenly it took a sharp nose dive, there goes the plane. Many parts are still intact, but fuselage and wing are damaged but reparable. They all told me it's receiver's fault. I have sent the receiver back to Hitec's customer service, it should get there this week, and next week I'd have the verdict from them, which is broken, if receiver is good, then there must have been something else, which I could not detect, if receiver is bad which I'd find out next week, it cost me my plane.

Mody
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Old 04-21-2010 | 11:14 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Sorry I did not mention. This picture was taken before I got the Rx. Rudder & Elevator are the one which fluttered most.
Old 04-21-2010 | 11:15 AM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

To clarify "Flutter" is not caused by the receiver, nor does your whole plane flutter.
When flutter occurs you can just slow the plane down to stop it..


It sounds like you are experiencing what we often refer to as a "glitch".

Either somebody was active on the same channel or there is another local device that is swamping your frequency.

You may need to change to another frequency to avoid it.

Also note that I've seen the effects of wind gusts or thermals, mistaken for glitching...

Low power levels may also cause glitching.

Old 04-21-2010 | 12:19 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

We had around 6 guys that day at the field, and mostly everybody was using 2.4 Ghz. Nobody's on my frequency, of course the rules of the clubs are, that you have to have your card in that slot so everybody knows if anybody's on the same frequency does not use it until that person is done using it. I don't know why you referred it to using the same frequency. Nobody was active on that frequency, as far as glitch is concerned so I know what glitch is, malfunction, error etc. I'm not trying to be rude or impolite here but the whole plane of mine fluttered, or jolted, or shook, and I saw it many times, at that time there was no wind gust, but anyway I don't think I'm gonna switch to the frequency, once again did not wanna be cocky did mean to be rude so please don't be offened, I have no intention to do that, I have respect for you all. Anyway it just that happened. I have to wait until I get a response from hitec's technical department, then I'd be able to figure it out what went wrong.

I cannot afford 2.4Ghz at the moment, being unemployed is a killer plus when your unemployment is also stopped. I'm also lil bit apprehensive by looking at 2.4 Ghz gets locked out on people. One of the guy at the flying field I used to go lost his turbine jet, and many videos on youtube I've seen, their Tx locked out and before they get their signals back, plane is already crashed on the ground.
Old 04-21-2010 | 12:52 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Did you range check with the engine running?

Metal linkage to the engine can give interference that happens at different revs and vibrations, and these can be worse at a low throttle settings.
Old 04-21-2010 | 12:54 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

I did check the range but not with the engine running. I still say it's receiver's problem. I'm gonna find out next week from tech department of Hitec.
Old 04-21-2010 | 01:03 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?


ORIGINAL: armody

We had around 6 guys that day at the field, and mostly everybody was using 2.4 Ghz. Nobody's on my frequency, of course the rules of the clubs are, that you have to have your card in that slot so everybody knows if anybody's on the same frequency does not use it until that person is done using it. I don't know why you referred it to using the same frequency. Nobody was active on that frequency, as far as glitch is concerned so I know what glitch is, malfunction, error etc.
No a GLITCH is not necessarily a malfunction.

Flutter is characterized by a loud BUZZING noise coming from A control surface, and has nothing to do with what you describe.

A Glitch or a HIT acts EXACTLY as you decribe, where the plane seems to suddenly switch directions, etc. with no corresponding movement of the control stics on your part.

Just because everyone is properly using the PIN board, that doesn't mean that other interference could exist on the frequency you are using, be it from other sources, other club member's TX's etc.

I was at my field one day flying 72mHz flying along without any problems.

All of a sudden my plane glitched exactly as you described.

I flew it around the pattern and I noticed that it did this again as it passed in front of someone else on a different 72mHz frequency.

It turned out that THEY had replaced the crystal on their TX... something that is illegal to do.

Replacing the crystal can cause sideband emmisions that interfere with other people's receivers, even if they are not on the same frequency...

They were causing interference with my plane... a scanner did not show this btw...


I gave them a stern but polite talking to about this... I found out they were not club members and didn't know what they were doing...


We also have nearby cell towers, pager towers and power lines... as a result certain channels/frequencies cannot be used because of RF noise.

That is the reason for the frequency question.

As Mr. Cox said it is important to perform a range check with the engine running...

Do you have a metal linkage, clevis or rod connected to the engine?


Old 04-21-2010 | 01:18 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

opjose

This answer of yours gave me many things to think about. I'd answer you one by one. Yes our club is very new, pin board is there, few people like 6 were there, so I don't think there would have been any interference. Cell phones always stay in the pocket, but never happened anything like that with my P 51 Mustang MK II, though servos chatter on it as well. The receiver on Mustang is 72 Mhz same Electron 6. As far as high tension electric wires are concerned, there is none, I have not seen any nearby cell tower either. I'm gonna take a look around again.

Elevator and rudder did start moving kinda shaking. One thing I did now I remember that when extending the antenna wire, it was little long for this plane, there was no kink in it neither bent from anywhere, but I did one thing in order to move the wire away from moving servo arms, I pused it down between 2 servos, and I scotch taped it against the servo's bottom, do you thin it might have gotten something that caused the interference which resulted in a great jolting/fluttering?

Thanks
Old 04-21-2010 | 01:48 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Yep, that is probably the reason right there...
Old 04-21-2010 | 01:53 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

I think you found your answer.
Old 04-21-2010 | 02:10 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

I could not have thought,. I would make such a silly mistake. I should've known better. Do you think is it the problem but taping the wire under the servo, despite there is nothing moving but the servo case, so movement of the cogs inside the servo might have caused it?
Old 04-21-2010 | 02:48 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Armody,
I don't necesarily think that is the issue, but it might have exagerated it. Are you flying near any metal structures? Did the glitch happen inthe same spot repeatably? Hitec usually send a bobbin with the receiver. Did you use this bobbin to wind up any additional wire? There should still be a large section of antenna wire run in a straight line to receive the signals. There shouldn't be enough electrical noise from the servos to cause a glitch, but if most of your wire is between the servos, the metal in the motors could be shielding the antenna.
Good luck,
Curtis
Old 04-21-2010 | 02:59 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

The servo has electronics inside it, including an electric engine. These will emit radiation that the plastic servo case can not dampen out. With the antenna being very close to the servo it will pick this up....

The same goes with the current through servo wires, these also emit radiation when there is a change in the current, i.e. they act like transmitting antennas.

If you're really unlucky you could in principle get a feedback circuit, i.e. moving the servo and gives noise in the antenna giving more motion and so on...
Old 04-21-2010 | 02:59 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

It could be the problem, I haven't had it before but things do happen. I haven't used tape to attach my antenna onto a servo before but I do run the antenna next to and between servos without any problem. Glitching is a hard one to run down but it could be a bad RX or a loose crystal in the RX?? Loose metal to metal contact on the plane will create RF noise. Engine running radio checks with a new plane and new gear is a must. Not that I always do it myself!!!! I'm chasing down an RF problem right now with a gas engine/ignition that I have never had a problem with before, making me crazy but I keep working on it. Being a dumb ass I didn't do my engine running range check {Mr. Ego here!} and it's a must do with all gassers, I almost lost the plane on it's maiden but sometimes my luck is much better then my skill! After a crash it is really hard to point to the problem. Please let us know what they find with the RX, sometimes you can get a bad one. I just ordered several of those RXs when they were on sale at servo city and they are working fine.
Old 04-21-2010 | 04:18 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

I have 4 of these receivers and they all work fine. I did have trouble with one of them in an Escapade just like your setup. Luckily, it giltched while I was taxiing to takeoff. The rudder and throttle went crazy, the engine throttled up and the rudder went hard over. I had the receiver behind the servos with the antenna looping back forward so that it can be passed through the antenna tube that comes with the Escapade.

I sent the Rx to Hitec since it was still under warranty and they sent me back what looked like a new one, at least the packaging was new. Hitec did not explain what was wrong or what they did. That contrasts with what Futaba does, they explain everything in detail. What I did on the Escapade was I cut out an access hatch at the bottom behind the wing and installed the receiver there, I cut the antenna tube and now it routes from there aft, staying away from the servos by a good distance. I haven't flown it this season, so I can't tell if the problem is solved.

I ended up sending my transmitter to Futaba because I got similar glitching on my U Can Do 46 with a Futaba Rx. They changed the antenna and a potentiometer. I suspect the potentiometer was shorting out.
Old 04-21-2010 | 04:30 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

Thank you all for your great experiences sharing with me.

I'm certainly going to let you know guys what Hitec people got to say to me. I have filled out their form, as I bought the Rx brand new over Ebay and I did not see any bobbin come with it. Crystal was brand new as well I bought it. Engine was brand new, plane was brand new, only thing old was my TX, JR XF421EX. Never had a problem, never had problem with the RX I'm currently using Hitec's Electron 6. The flying field I fly, there is no huge structure building, only a lot of trees around, haven't seen any cell tower, there is a shooting range nearby, never went down their to take a physical look, as echo there is a lot so we keep hearing the shots being fired all day around.

Antenna wire had never been around servo arm which may have caused chafing, so getting chafed by servo gets ruled out. Servos do chatter, their are many reasons and naturally at home we have current all around our house, so where there is current there is magnetism or electromagnetic waves which cause a lot of things. I get buzzing sound on my guitar as well whenever I switch the pick up selector, as pick ups do have magnets in it, ceramic and alnico. So I pretty much understand that. Having that happened in an open flying field where there don't seem to be any kind of collateral or any kind of other interference exist, I dont know how it happened.

I'd go for the receiver's fault and I think as antenna wire was long and it was going in between 2 servos, so I had to push it downward through the slit and gave some slack, and then tape against the servo's bottom. It's really kind of complicated. I'd be so sure to let you guys next week whenever I get a response from Technical support team of Hitec. As the form I filled out and sent them the receipt, so if you don't send them the receipt it is left to the discretion of the technician whether he checks it or not. Thats first thing I heard. Anyway I'd keep you guys posted.

Thanks again

Mody
Old 04-21-2010 | 04:37 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

So far you have failed to answer a key question that was listed by oppose. Its is more common now that folks have returned to using a metal clevis or an 'S' bend in a metal throttle arm at the enginel.

With FM systems it is a ticking time bomb that will get you sooner or later as that hole wears. Please tell me you didn't have metal to metal on the throttle arm at the carb.


John
Old 04-21-2010 | 04:46 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?


ORIGINAL: armody

Thank you all for your great experiences sharing with me.

I'm certainly going to let you know guys what Hitec people got to say to me. I have filled out their form, as I bought the Rx brand new over Ebay and I did not see any bobbin come with it. Crystal was brand new as well I bought it. Engine was brand new, plane was brand new, only thing old was my TX, JR XF421EX. Never had a problem, never had problem with the RX I'm currently using Hitec's Electron 6. The flying field I fly, there is no huge structure building, only a lot of trees around, haven't seen any cell tower, there is a shooting range nearby, never went down their to take a physical look, as echo there is a lot so we keep hearing the shots being fired all day around.

Antenna wire had never been around servo arm which may have caused chafing, so getting chafed by servo gets ruled out. Servos do chatter, their are many reasons and naturally at home we have current all around our house, so where there is current there is magnetism or electromagnetic waves which cause a lot of things. I get buzzing sound on my guitar as well whenever I switch the pick up selector, as pick ups do have magnets in it, ceramic and alnico. So I pretty much understand that. Having that happened in an open flying field where there don't seem to be any kind of collateral or any kind of other interference exist, I dont know how it happened.

I'd go for the receiver's fault and I think as antenna wire was long and it was going in between 2 servos, so I had to push it downward through the slit and gave some slack, and then tape against the servo's bottom. It's really kind of complicated. I'd be so sure to let you guys next week whenever I get a response from Technical support team of Hitec. As the form I filled out and sent them the receipt, so if you don't send them the receipt it is left to the discretion of the technician whether he checks it or not. Thats first thing I heard. Anyway I'd keep you guys posted.

Thanks again

Mody
I would a shooting range there, it's Texas!!!

But seriously, I got my glitches in the Escapade with the Hitec Supreme II in the field and in my house. So I know it wasn't anything to do with the field. I think in the end it turned out to be a bad potentiometer in my transmitter. You might want to check the transmitter out also, just to be safe.
Old 04-21-2010 | 04:50 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

ORIGINAL: hsukaria

I would a shooting range there, it's Texas!!!

But seriously, I got my glitches in the Escapade with the Hitec Supreme II in the field and in my house. So I know it wasn't anything to do with the field.
Unfortunately that is a poor test in most cases....

Homes are repleat with devices that can cause false glitching and movement.

Local WiFi signals, wireless phones, microwaves, etc. can swamp the sensitive receiver electronics causing all sorts of problems.

Even having the TX TOO close to the RX can be problematic...



Old 04-21-2010 | 04:50 PM
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Default RE: Any experience with Hitec's Supreme IIS 8 Channel FM Receiver?

John.,

Sorry that answer litterally slipped outta my mind. Throttle servo had nylon arm, and the push rod was bent to go through the servo arm hole and there was another nylon piece attached to it to provide support by not letting push rod pop outta servo arm. The push rod connected to Car it was Z band and metal to metal, I did not use any clevis I guess I used the right word or any kind of plastic connector to connect the throttle push rod to carb arm. So push rod had a Z band and connected directly to the carb arm.

I hope I have explained it well. Does it have to do anything with something that happened?

Mody


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