4/23/2003 by Peter Vieira
Provider Name: RC Car Action
Issue: May 2003
Copyright:© 2003 Air Age Media
Don't forget the servos
Along with the RS300 75MHz receiver, a 4-cell, AA battery holder and a switch harness, the XS3 includes a pair of servos that are a good match for any type of
Z270 Standard Race Servo.This is your basic servo; it has a plastic gear train and about 40 oz.-in. of torque. This servo is best for the throttle or shifting mechanism if you drive a nitro car.
Z590M Torque Race Metal-Gear Servo.
Here's your steering servo; with 85 oz.-in. of torque and a 0.15-second transit time, it has the juice to keep your nitro and electric trucks and touring cars pointed in the right direction.
Variable frame rate is the latest in RC radio technology, and it's designed to exploit the superior speed of digital servos. With the fast frame-rate setting, digital servos can respond more quickly to commands. JR recommends that you use the fast frame rate only if your car has at least one digital servo. If you use analog servos, the fast frame rate offers no advantage, so select the normal frame-rate setting.
So...does it work? The answer is "Yes." When using digital servos, there
is a difference in responses obtained with the normal and fast frame-rate
settings. It isn't a dramatic difference, though; you may not feel it
if you race off-road or in other situations in which the cars have breakable
traction. But in situations where every millisecond counts (such as high-traction
carpet racingespecially 1/12 scale), you'll be able to feel increased
quickness and precision in your steering inputs.
In our February issue, we gave the XR3i high marks for its ergonomics and easy-to-use functions; the XS3 feels the same and operates in exactly the same way. The adjustable wheel tension is a welcome feature
(I like mine really stiff), and the Direct Trim feature is a plus; with each click of a trim switch, the LCD screen automatically displays the function's setting.
Of course, the most important item to test was the XS3's frequency-synthesizing system. Instead of having rotary dials on the transmitter, the frequency is selected using the LCD screen. The "increase" and "decrease" buttons are used to punch in the frequency, and then the receiver is set to match. (You'll need a flat screwdriver with a 2mm tip to set the receiver dials.) Once you've matched the frequencies, the system is ready for you to switch it on and drive.
You'll never notice or think about the frequency-synthesizing gear while you're driving, but you'll love it when there's a frequency conflict in your Mainthat will be some other guy's problem. Likewise, you won't have to waste valuable practice time hanging out at the frequency board waiting for the guy who is hogging your frequency. Punch a few buttons, twist a couple of dials, and get out there; that's the real advantage of JR's crystal-free XS3. Well, that and its huge cost savings! With a suggested "street price" of $239 (with servos), the XS3 costs far less than what you would spend to buy a similarly equipped radio set and all the crystals required to match its synthesizing capabilities.
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