JC,

I have used JR servos with my Futaba receivers..( 309dps and 319dps PCM )...and never a problem.....
I've never owned a JR radio so i can't speak from experience if Futaba servos in a JR receiver causes any problems.....
But i'd anticipate it would be ok.....
I fly a Futaba 9Z-WC2 system, and always use a Deans whip antenna or a Revolution whip antenna on my receivers.....
And again, no problems using the whips.....
I always use heavy duty servo extensions, heavy duty switch, and 5 cell / 6 volt nicad JR batteries...( unregulated ).....
I'll continue to use my 9Z for as long as i can.....but i will get a 12Z 2.4 system when they hit the market....i can use the extra channels in my jets.....

Regards.....Rich