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Old 05-25-2006, 07:41 AM   #1
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Default What Feataures to Look for in a Radio?

I'm looking for my first radio and I'm not real clear on what all the features and adjustmens are. Is there a breakdown somewhere of what features do what? What features are important to have and what features are nice to have especially for a new driver.
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Old 05-25-2006, 07:52 AM   #2
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The most useful features to have in my opinion over a basic set are...

1. Steering Sub-trim
2. Steeing EPA (end points)
3. Steering dual rate
3. Steering and Throttle exponential (curves)

These are the only ones I use when preparing a car for racing. Basically these allow you to make sure the steering servo is working optimally, and give you a small tuning option for changing track conditions.

Most of the other options on high end radios are IMHO unnecessary, although each serves a purpose.

Many of the mid-level sets out there have these as standard now, but most of the basic sets don't.
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Old 05-25-2006, 07:56 AM   #3
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I know what the EPA is but what exactly do the other three features you mentioned do?
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Old 05-25-2006, 08:47 AM   #4
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Sub-trim - gets a true centre for the servo without affecting the range of movement.

Dual rate - Allows the driver to reduce steering lock

Exponential - Allows the driver to make the steering/throttle respond in a curve, giving the opportunity to make the response milder or sharper near the neutral.
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Old 05-25-2006, 09:37 AM   #5
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Quote:
Originally Posted by SlamMan
I'm looking for my first radio and I'm not real clear on what all the features and adjustmens are. Is there a breakdown somewhere of what features do what? What features are important to have and what features are nice to have especially for a new driver.
im also a new driver and i found that its nice to have sub trim and dual rate easy to reach
i think i adjust the dual rate the most
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Old 05-25-2006, 10:51 AM   #6
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Quote:
Originally Posted by sosidge
Dual rate - Allows the driver to reduce steering lock
What's steering lock?
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Old 05-25-2006, 12:12 PM   #7
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Quote:
Originally Posted by SlamMan
What's steering lock?

When the steering servo reaches it maximum travel limit with steering system of the chassis. If you have a servo saver attahced, you will notice the saver engage, when the wheels are turned to to max point either left or right, and the the servo will be "whining" or "grunting" at you because its trying to force the steering setup beyond its max limit.
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Old 05-25-2006, 01:51 PM   #8
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Lets clarify steering setup a little.

Steering lock is the physical maximum the car's chassis will allow the wheels to turn, regardless of whether or not a servo is fitted.

Sub trim must be set so the horn is at a geometric neutral. Some horns/servos will sit at an angle to the steering system if left untrimmed, and this will affect the linearity of the steering response.

The EPA must be set up to allow the servo to reach full lock (no more, no less) at full transmitter travel without straining the servo. This must be set with the dual rate at maximum.

The Dual rate is then used to reduce the amount of steering lock to less than 100% if the track demands it. Less lock = less steering, although you should always have sufficient lock to turn a full circle in the width of the track.

Common mistakes involve using the dual rate to do the job of the EPA and vice versa. The method I have listed above is the optimum way of getting the full range of steering travel and adjustment.
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Old 05-25-2006, 06:34 PM   #9
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i think now i understand
in my own word:
1. EPA - to find servos max point
2. Dual Rate - amount of steering (adjust according to track layout)
am i right?
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Old 05-25-2006, 07:22 PM   #10
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sosidge did a good job of explaining things.

Exponetial is a biggie. You can really calm the steering and throttle with it. I nearly always use 30% on both. Sometimes more.

Just don't buy a radio without these features. Beware, there is a VERY popular radio out now that does not have expo........Which in my book makes it completely worthless.
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Old 05-25-2006, 07:44 PM   #11
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Quote:
Originally Posted by Manning
sosidge did a good job of explaining things.

Exponetial is a biggie. You can really calm the steering and throttle with it. I nearly always use 30% on both. Sometimes more.

Just don't buy a radio without these features. Beware, there is a VERY popular radio out now that does not have expo........Which in my book makes it completely worthless.
Which one?
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Old 05-25-2006, 11:59 PM   #12
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Guys can i ask about those Spektrum DX3 radio? Are they any good or over hyped? how so they compare with FM digital radios?
Many thanks
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Old 05-26-2006, 01:31 AM   #13
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just wandering does anyone know the response time for each high end controller. 3pks, m11, helios etc? thanks
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Old 05-26-2006, 10:33 AM   #14
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I know that manufactures will come up with different names for the same feature for marketing purposes.

Would the exponential feature, or any other features for that matter, ever be known by another name? Something like steering and throttle curve for instance?
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Old 05-26-2006, 11:01 AM   #15
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Yes, expo is also called curve.
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