in the past I have had servo jitters when using JR servos with Futaba receivers. i was told my some folks that the phase electric signals were different for the two systems. Anybody else have these issues ? Thanks for your help.

Never had a problem, analogue or digital.

it would help if you stated which servos and which radio..beyond just brand names

I have had no issues when combining JR ST125MG High-Torque Servos with Futaba 72MHz and 2.4GHz receivers.

Literally hundreds of flights using JR servos with Futaba receivers. Dead reliable.

Maybe in some of the old technology, but not the new stuff today. I use a Futaba 12Z and run both JR and Hitec servos with no issues.