general sound question hl ...wineing sound ?

[mcevoyi]

hi all

i have several hl tanks .. to day i added to my colledtion .. and decided to actualy powere up my nice shiny new panther !

i fire her up .. and noticed a wineing sound thats quite loud .. so check that the smoke gen is off ant off it was . so i thought may be a small problem ..so tryed one of my JP's .. same problem ...the sound almost like feedbck ..but its constant high pitch tone .. that dose not change when the tank is mobile or just sat there .. its on 3 tanks that i have checked

any got a fix or do i just live with it and upgrade one day

ain

[Matdragon]

hi iain,

what boards are you running in the tanks ?

ive heard before that the rx-18 occasionally makes a whining sound through the speaker like you describe,

cheers,

Matt

[mcevoyi]

hi there matt

all my boards ar rx-18....

[afv]

I'm no expert but try the tanks in another room or another part of the house, you may be getting interference from another apliance
regards Jack.

[mcevoyi]

yes i will try that as i am in the sitting room chaseing the cat ! ... which seems to think the panther is a big gray mouse .. most hysterical ... poor demented cat ! ... it may be BB time soon !

[STEINER]

I have the same problem with my Tiger (RX-18 board ) Doesn't matter where its run, although the wine is transient.

[mcevoyi]

i wounder if its some feedback from the motors ans some crap surpression ...

any one know ?

[jrc]

as mcevoyi says its probably rf from the motor and one of the capacitors will have broken down, and beware cos that cat will have it's revenge 8o|

[Tankie]

I don't think the noise is feedback or poor suppression, I think it is the switching frequency of the FET's that drive the motors. The suppression capacitors wouldn't cure this. To a degree i've had success in getting rid of the sound on idle by adjusting the trim on the transmitter to nearer the motor bite point. I think this problem is peculiar to RX18's

[mcevoyi]

thanks evey one for the replys !

tankie .. may i ask how to do what you surgest i have no idea .. being a bit of a dime bar when it comes t things with elastic trickery involved ! lol

iain