they are all jittering a lot and it stops whenever I turn off the tx. and I don't think it ever did this before. does anyone know what could cause this?

A little more info might be helpful. Are you inside/ouside? Is the TX near or far from the RX antenna. Are the batteries properly charged? Any recent crashes or hard landings? Is the TX antenna extended or collapsed? What kind of radio/servos? Is this a new installation of used parts or a plane you have been flying for a while? Have you changed ANYTHING recently?

Inquiring minds need to know.

wait i think i figured it out,or it stopped anyway, after going from a 600 mah to a 1400 mah battery in the receiver.

I'm no battery expert, but going from a 600mah to a 1400mah should have no effect on the servos jittering. Might want to go over the plane again.

Your 600mah may have not been properly charged could be one of many culprits.

I get this also,more so in my old AM radio. For me it is usually caused by my TX being to close to the plane. If it happens and you move your TX farther away and the jitter stops i wouldn't worry about it. I have had this problem with the radio too close for years and have never downed a plane from this.