R/C Tech Forums - Spektrum

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Quote:

Originally Posted by andrewdoherty

Credit goes to bvoltz on this. I read your post and a few days later it struck me . . . "why not just use my post hole reamer to enlarge the spektrum top case antenna hole bit by bit *READ--> CAREFULLY*until the antenna tube can be forced snugly into the top of the case and have the antenna exit through the top into the tube?" I didn't stop there though. I really wanted the entire antenna under the body with a clean look that would keep the antenna safe. So I cut my antenna to 3.6" exactly from the board. Then I measured the amount of antenna tube I would need to cover the antenna from the case to the end of the antenna. Once measured and cut I ran several inches of solder through the antenna (any string will do, I just had solder in front of me) and started twisting it while curving the antenna until I had a radiused 90* curve in my antenna that would let it sit below my body (I did this for an RDX with a stratus carpet body). While in the curved position I heated the antenna tube with my wifes haoir dryer for a minute or so and then walked over to the freezer, grabbed a piece of ice, and ran it along the antenna to get it to stay in the bent position. I took the string out, ran the tube over the antenna and pressed it firmly down into the case and then put one of those tube end plugs on the end. Now I no longer have to wiggle my antenna out of my body after each race!! I dont have a camera or I'd post pics. No problem with range though using a futaba 9550, a sphere comp, a 4300, a pt and the big LRP worlds cap plugged into the reciever.

Thanks for kind words... I have mounted mine by cutting the RX of the tube at a 45 angle, then holding down the tube (antenna in the tube) shoe gooed the base, this serves to protect the base of the antenna wire. But I really like your idea, and you could also shoe goo it in place inside the RX case. I would not CA glue it, in case you need to take it out...

I thought about the shoe-goo too . . . I just wanted to try it without to see if it was necessary. There is only about 1/8th of an inch between the top of the circuit board and the inside of the case so I don't want to risk shoe gooing the board to the case if I don't have to. So far the pressure fit of the tube in the case is enough to keep it in place.

As I think about it now though if it needs to be secured I think I will take the top case off and CA the tube so that the bottom of the tube is flush with the inside of the case. I will probably only use CA on the inside of the case so the glue is not seen from outside teh case. If I ever need to change anything I will just cut the tube flush with the case and then ream out the remainder using the post hole reamer again. Good as new!!

Does anyone have the schematics to the SR3001 DSM 3-Channel Pro Series Rx, Surface receiver? I'm building something and need to know the voltage ranges, so I do not fry it.

Airtronics M8 issue

Sorry guys if this has been asked before.

I just picked up the Spectrum module for my M8 and the NEW mini reciever for my 12th scale. I run a GTX and the JR 3550 servo. Anyone have any problems running this combination? Do i need to run the cap on the reciever?

Any info is appreciated...

Sorry for asking this, and I know it has been answered, but I can not seem to find it... what is BEC short for?

Battery Elimination Circuitry

Quote:

Originally Posted by Matt Howard

Battery Elimination Circuitry

Man, you are so smart!!

Quote:

Originally Posted by HarshGuy

Man, you are so smart!!

w h a t e v e r

You should use the cap on your 1/12th scale. You only have 4.8 volts going to your RX to supply your servo. If you run the cap you will be less likey to dip below the threshold voltage and make the RX go into failsafe.

I wish more speedos would come with adjusable voltage BECs. A voltage amplifier would be cool too.

Actually, if these new receivers could be changed to 4 cell mode it would help as well. Just disable the failsafe for 4 cell applications and pass the voltage straight through.
If there was a micro that advertised this everyone would use it in the 1/12th world.
My 2 cents,
TEX
:tire:

Antenna issues? Servo shutdown.

I've had my Spektrum system for my M8 since they first hit my LHS, I've been using it without any issues but, recently I've experienced some problems. I've read the threads and read about a servo "shutdown" problem where the steering servo would lose power briefly. The quick fix was to route the antenna wire inside the module behind the circuit board...

So I decided to open up the module and try it out. Once I got the 4 screws out and gently pulled the two halves apart, I noticed that the antenna was no longer attached to the circuit board, it was ripped off.

(Visions of my 2 year old son spinning the Spektrum antenna days prior.. "round, round, round...")

So in order to finish the race, I soldered the wire back onto the little connector. I was able to finish the race that weekend, Although I had 1 moment of "shutdown" that drove my car right into barrier.

I went to practice yesterday and now the "shutdown" happens everytime I enter a particular corner on the track, the same corner, everytime. It's not even the furthest point from the driver's stand.

So, my question is... Can I buy just the antenna somewhere? Could there be another problem? Do I need to buy a new Module?

Thanks in advance,

John

John, the antenna is not designed to be user serviceable. Additionally, since you soldered onto the board, you may have inadvertedly damaged where the antenna may not plug back in correctly. I'd suggest that you send it in to have a tech look at it.

RCGaryK, I was thinking about sending it back but, reading the Horizon website, it'll no longer be under warranty because 1) it's over a year old and 2) I messed with it obviously.

Maybe, it's worth a try, I need one of my Spektrum receivers repaired too (will not turn on).

I experienced the servo shutdown a few times a month or so back when it was extremely hot on race day. Having suffered from the total shutdown (failsafe) issue both outdoors and on carpet the previous season, I had already sent my gear in for the upgrades to both software and antenna routing. I also tried both the original spektrum and new Pro series receivers and got the same results. To correct my problem, I plugged the old faithful Spektrum capacitor back into my receiver and never saw the servo shut down on me again.

I was experiencing the "servo shut down" syndrome. It happend a coulpe weeks ago, so I switched out RX's and problem solved. I thought, until the next weekend it started again. I figured it was the dam servo, so I switched it out and I thought everything was A OK, but it started doing it again, so I witched RX's once more then, guess reared it's ugly head once again, you guessed it. So I guess the problem is with the heat. I'm running it in an 1/8 buggy, which means the RX's in a box inches from the motor. What have y'all done to fix this. Is this a software issue, or mechanical?

Rob - I've had a problem caused by a faulty solder joint in RX battery pack, was mucking up in the same part of the track each lap! Was blaming the spektrum so put the normal modules back in and still had problems. Fixed up the RX pack and all good :)

I've test ran the Spektrum & Mamba max on 4 old laptop nimh cells (3/4?). While performance sucked (the batteries couldn't deliver the amps, big voltage drop) there was no problems with the operation of either the Spektrum or MMax.