Hi,
I dont know anything about the allowed frequency and modulation in the U.S.A. so please select the frequency on your choice.
But I can tell you something about the parts, you can use.
Lets start with the reciver:
GWS R-4P is ok. In germany this one called "Graupner xp8" or "jst-mini". It is the best choice i know. The letter "H" or "T" is the plug. This is on your choice, I use mostly the "T" type and unmount the plugs.
http://www.gws.com.tw/english/product/receiver/r4p.htm
Servo:
Here I use the GWS Pico. In germany known as "Graupner C141 "or "mikroantriebe pico".
Its not nessesary to use a high quality servo. The cheapest one is the best for microtrucks. So take your choise by asking your amount ;-)
Important is only the weight and the sice. So I would catch the 5.4 gramm Servo.
http://www.gws.com.tw/english/produc...ub%20micro.htm
Speedcontroler:
Nothing comercial is nessesary. It is easy to rebuild an old servocontroler or buy a servocontroler-kit in a electronicstore. An electric circuit of a servocontroler based speedcontroler you will find at
http://home.t-online.de/home/tfeucht.../frsmd4_e.html
battery:
Ok, I found on the GWS pages an usefull one, but still not the best . The GWS one called 50AAA. You need this 4 times for 4.8 V
http://www.gws.com.tw/english/produc...ry/battery.htm
The best one is the GP12AAAM and I found a datasheet here:
http://www.gpbatteries.com/industria.../NiMHspecs.htm
It is nearly the same sice than the GWS and more than double capacity. But I dont know where in the U.S.A. You can catch them.
Motor:
I think you can use here any old servo motor (maybe you recycle the rest of the servo you need to get a speedcontroler). On GWS I found the "CN12-B2". This one should be fine:
http://www.gws.com.tw/english/product/motor/motor.htm
Transmitter:
This is on your choice again. Just select one, that is compatibel with the reciver you get ;-)))
I saw the GW/4TA and this one may be fine.
http://www.gws.com.tw/english/product/system/system.htm
best regards
Thorsten
www.mikromodell.de