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Subject: Subcarriers

Date: 02/28/03 at 3:47 AM
Posted by: David Howlett
E-mail: david.howlett@eqcs.co.uk
Message Posted:

In Reply to: Re: 27MHz Radio Control posted by Russ Kincaid on 02/27/03 at 4:49 PM:

Cheers for replying Russ,

The task at hand is dealing with a new toy that is going to hit the UK quite shortly. It's produced in China and Distributed through a compnay called Race-Tin.

At present the Chinese manufacturer are producing only four variations in the 27mHz band, why only four, I don't know. Anyway Race-Tin are goin to produce a marketing campaign in the UK, where they need to be able to race (hopefully) 20 cars at the same time (My job. with a house full of cars). The IC in the car (receiver) is called [RX-2 11109022]. So which way should I go, I could find out who produces the IC in the car now, and see if they produce enough variation, so I could swap out the IC. Or maybe, switch to another PCB assembly altogether, which might be the better idea.

I've never dealt with 27mHz stuff before, I normally work with 802.11b, so this is new ground. I'm interested in the subcarriers you mentioned. Can I reduce the dand widths of the individual singals required for each car, hence increasing the number of cars running at the same time, or will I still experience collisons between the tranmitters.

The maximum supply voltage I've got to play with is 3V, supplied via two AA batteries, so the thought of using the LM1871 series may not be possible, due to the number of coils I would need to implement. Though I maybe a bit rusty, and technology has moved on.

Anyway, If you know of a white paper on the subject, I would be grateful for a pointer in the right direction.

All the best
Dave Howlett.

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