Airhead

Thanks Ed ,
Appreciate the help..

Radbuster

I'm looking to buy an inexpensive, neg shift, FM TX (to match my RX's) and online vendors don't say + or - shift. Frustrating. I know Futuba and Hitec make neg shift, but how about E-flight, Dynam and others?
example:
Product Name:NE-KO 4
Product Description:4CH Radio Control System Channel: 4 Channel
Frequency:72MHz
Charger port: Yes
simulator port: Yes
Program type: PPM
Modulation: FM
RF power: ≤0.8W
Static current: ≤250mA
Power resource: 1.2V*8"AA" BATTERY
Voltage display type : LED
lower Voltage warning: Yes
Size: 180*190*60mm
Weight: 550g
Certificate:CE,FCC

AEAJR

Can't tell you about the off brand.

How about FREE?

Free Hitec Radio
http://forums.flyesl.com/topic.asp?TOPIC_ID=240

No need to buy a Used Radio
http://www.rctower.com/forum/viewtopic.php?p=1251#1251

Airhead

I like the way you look at things Ed...
Thanks for the links..

Radbuster

Thanks for the reply, Ed. Someone posted that since the 2.4 GHz units came out, there are good deals on used 72's. So I'm looking...

III Bones Air Force

I have a problem. I know you are propably saying ..OOOOk, it is your problem why are you sharing it then? Well I figured by sharing my problem with my somewhat very very new Super Cub, I would then share the burden.... The burden of having to figure out why in the heck is the elevator servo acts as if it has Parkinson disease? I turn the trasmitter on... plug the battery....check the trim ..and shortly after I start hearing this irritating faint buzzing noise coming out of the servos as if they are attempting to proof their mere existance.

Well that (the noise) is not the problem..The real problem is the elevator servo, the one that developed Parkinson all within three weeks of buying the Super Cub and at most just three attempts at a maiden flight.

Now the elevator servo gets stuck pushing the elevator up. I changed the tarsmitter batteries....I even changed the troubled servo...to no avail....(ACT is unpluged). Now I am in the process of buying an ESC unit to see if that would solve the problem....

I am hoping that this problem with my Super Cub was not experienced by other Super Cub owners..If so, and any of you read this, please reply with your ideas...Who knows....with a little help from my friends....maybe someday we all could stamp out "SPD"
or Servo Parkinson Disease so that the world of Super Cub flyers would be alittle easier to enjoy.

AGA, Windy part of MN

xuzme720

is there any binding in the pushrods to the elevator?

AEAJR

This is NOT the right place to ask this question. This thread is about receivers.

Take your plane back to where you bought it. Sounds defective.

III Bones Air Force

No Xuzme720 there is no binding. I think the receiver is defective. At the same time XUZME AEAJR while you may be right, you could have been more diplomatic at the same time. Guess what you were not. The problem is a reciever problem, and my thinking was that if I do not get an answer here, ,then at least fellow RCers would be aware of the problem. Take it easy, take it easy, don't let the noise of your own wheels (or servos) drive you crazy.

xuzme720

I would tend to agree Air Force. replace it and see what happens. better yet, take this to a new thread if a reciever doesn't fix it so other flyers can try to help as well. good luck..

III Bones Air Force

Yo Peace and Thanx XUZME

xuzme720

I even thought of a good thread title....
"ok..so it's NOT the reciever!"

AEAJR

In talking about receivers, I guess it is time to add 2.4 GHz to the discussion as these are now in wider use than when I wrote this originally.

Here is a thread that discusses the 2.4 GHz market.
http://www.wattflyer.com/forums/showthread.php?t=22170

AEAJR

With 2.4 GHz in wider usage I thought I would update this thread with a bit more on receiver installation for 2.4 GHz. From what I have read, there are two installation points to watch with 2.4 GHz systems:

• 2.4 GHz has problems with carbon fuselages. 72 MHz does too, but the long antenna of the 72 MHz systems gives us options that 2.4 GHz does not. People are developing work arounds.

• Do not let your receiver pack get below 3.2 volts under load as this can cause a reboot of the receivers. Of course best practices would be the same for 72 MHz systems, so this is really nothing new. Since the 2.4 GHz receivers are really little computers, a reboot can cause you to loose contact with the plane. This can rage from less than a second to several seconds, so pay attention to those receiver batteries.

If you are an electric flyer you should read this thread. Crashes have been blamed on receivers when in fact they have been caused by something else.

Understanding the LVC and BEC features of your ESC
http://www.wattflyer.com/forums/showthread.php?t=23541

AEAJR

Spektrum RC splits the 2.4 GHz band into 80 slices. When you turn on a Spektrum transmitter it takes two of these slices at its "channels" for talking to the Receiver. It has long been expected that if you tried to turn on the 41st Spektrum system, it would not be able to lock with the receiver.

Well, in this month's month's FlyRC they ran a test. They turned on 44 Spektrum DX7s operated them all at once. Then they turned on a JR 9303 2.4 GHz, the 45th transmitter.

Know what? They all worked, all at the same time, with no problems.

Cool!

AEAJR

Report from May 2008 - New record

Based on a new record, successfully set at 99 planes in the air at one time, they happened to set a new record for documented 2.4 GHz in the air at one time at 52 systems.
http://www.rcgroups.com/forums/showpost.php?p=9744324&postcount=338

Firestem4

Thanks a ton Aeajr, This was really clear and concise.

Slow timer

Hi to those in the know- i as a novice on radio stuff would like to know is it possable to use ONE transmitter and get plane reciver(s) on more than one to work? have few basic 3 ch set ATF types- have a 4 ch GWS on one plane , & as got to many planes & not enough radios -do i need a seperate TX for each RX, or can LHS sell a RX with a matching crystal to work on a second plane? all park fly stuff - any hints on this ?
John in Sydney.

AEAJR

Absolutely. This can be done in a number of ways.

Using 72 MHz systems ( or the comparabel radio in Sydney ) and a simple, "standard" radio, you do this by having all the planes use channel crystals on the same channel. So, for example, if your radio is on channel 40, you use channel 40 crystals in all your receivers.

You will have to reset any trims on the radio to match each individual plane. It is a pain, but it can be done. It is prone to mistakes.

Use a computer radio and you now have model memories. Now the radio saves the settings for many planes. You simply select the plane and the radio resets to the trims and mixes for that plane.

All of the 2.4 GHz radios, that are not part of an RTF package, have model memories. On 2.4 GHz, you don't even have to worry about channel as the radio handles that automatically.

Hope that helps.

Slow timer

Thanks AEAJR, we'r on 27MHz/ 36Mhz down here- now i can work something out!! J.

AEAJR

If you read the discussion from the beginning, I think you will find it answers your questions.


Since you are so new to this hobby, may I suggest you spend some time in the beginner forum reading the sticky discussion at the top of the forum. Of particular interest would be this one:


Everyting you wanted to know about electric flight.
http://www.wattflyer.com/forums/showthread.php?t=31368

Then look at the six keys to success.

Between those two and this one you will have just about everything you need to get off to a good start.

pattern14

Hi Aeajr, using both futaba and Jr tx's. Replaced the original futaba rx with an electron 6 which appears to work pretty well, and was looking at getting another rx for a new build, to use with jr maxx 66. An interstate distibutor stocks mzk brand recievers, which I believe are the latest version ( rebadged, new owners, not sure) of the "berg" rx which seems to have a good name for itself. They are slightly cheaper than both the Jr and electron rx's, and I have been told/informed that they are single conversion, not the dual conversion that I am currently using. Any suggestions? Stick to what I am used to, which,( although I get the odd glitch which I suspect comes from the electric fences) works fine, or try the mzk. I remember seeing a thread somewhere that suggested that berg rx's work better with Jr tx's than the jr rx's do. Being very isolated (NO-ONE around me flies r/c) I have to rely on advice from distant sources. Any help is appreciated cheers....

AEAJR

I don't know about a new branding, but Berg always had a good reputation. On the other hand I like Hitec receivers. Thew newer Hitecs are shift select so they will work with a neg shift Futaba or a pos shift JR. Just check the label to be sure.

slipstick

MZK Rxs are not Berg Rxs. Like Schulze, MZK originally licensed some of Peter Berg's DSP technology to use in their equipment but they make a lot of different receivers. Look for DSP and TSR in the description to see if they're using Berg-type technology.

I've used one MZK and several Schulzes DSP Rxs (all on 35MHz) and they've all been excellent. How well they work on whatever frequency band is in use wherever you are I really couldn't say.

Steve

Huffy01

Recently I bought a plane which needed the BEC disconnected so the ESC was not powering the receiver. The middle wire was removed to do this.
I was wondering what individual wires do?and which position on the receiver?.
I guess there is a difference for the battery plug because the power is going into the receiver but servo's need power to operate.