onecuwldood

My Feedback: (1)

Our club bought a JR S400 to use as a buddy/trainer box. It came without a battery but it appears it has to have a battery for it to work as a buddy box. It there a way to work around this. Our Futaba buddy box does not need a battery in it to work. Can you simply jumper the battery connector in the S400 or does it have to have a battery in it? We have a weather proof box we keep trainer cords and buddy boxes in and don't have a way to charge them at the field except for quick field charging which is supposed to be hard on batteries.

Thanks for any info.
David Palmer
President - Somerset Model Airplane Club www.smac-ky.com

dsnyder

It must have a battery installed and charged.

JRPB9081 EXTRA TX NICD 800MA(WHITE CON)
JRPB955 TX NICD 700MA(WHITE CONN):4-8
JRPB5011 TX 9.6V PACK 2500MAH NIMH SANYO

onecuwldood

My Feedback: (1)

Thanks, I was afraid of that...

sigvicious

I have an S400 buddy box. It has a place for a crystal. Can I install a crystal and use it as a 4 channel transmitter?

dsnyder

Yes.

sigvicious

Groovy, thanks for the info. I put a channel 49 crystal from one of my Hi Tech radio's in it and didn't get the response I'd hoped for. But, this radio might require a different crystal or isn't compatible with the Hi Tech receiver in the plane I tested it on. The control services responded with gimble input, but not in a consistant fashion.

Thanks again.


Sig

dsnyder

It requires a JR crystal.

sigvicious

Well, that would make sense. Just to double check, I called my local Hobby Bench and posed the same question. The answer was no, I couldn't use it as a transmitter. I told the guy I'd installed a crystal and got some response. He replied saying the buddy box wasn't tuned in or something to that effect.

I guess I'll buy a JR crystal and give it a try. It can't hurt anything.


Sig

dsnyder

There isn't anything needed to do except install a crystal.

sigvicious

Thanks again. Next time I'm out, I'll pick up a JR crystal and give it a try.


Sig

Cashpoboy

My Feedback: (7)

Sig,
Did you ever get a JR crystal and see if it would work?
I got one exactly like yours and want to know if it really is true before I buy a JR crystal.

Thanks.

godzilla95

I put a crystal in mine and it worked just dandy.

Mac_Man_UK

Hold on a sec !!

Is not illegal (according to the FCC)to do what you have just done ??

Sticky http://www.rcgroups.com/forums/showp...77&postcount=1 refers...........
and also referenced here... http://www.rcuniverse.com/forum/m_6026449/tm.htm

bruce88123

Hopefully now that he know it will work he'll send it to a shop for testing. Since this radio has NEVER been tuned it is certainly mis-tuned. It may operate but probably not properly.