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'[PIC]: Manchester Encoding for low power RF module'
2003\05\21@210931 by David Clark

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Hi Tal,

    Thanks for the quick reply.  The answers to your questions:

>do you need bidirectional link or only one direction ?
Only one direction
>Does the baud rate of the RS232 output from the receiving side >must to be
4800 ?
Yes
>What is the max/recommended bit rate for your radio link ?
>Does your radio link has any minimum requirements for bit rate >or can you
send long ones and zero's ?
The modules that I am trying to use are an AMRT4 transmitter, & AMHRR3
receiver, both from http://www.okwelectronics.com.  I have looked at the data
sheets for both & cannot find any mention of max/recommended bit rate, so I
do not know the answer to this question.
>What is the interface of your radio link (digital, analog, etc).
The interface to both the transmitter & receiver are thru MAX232 chips to
convert the rs-232 to TTL levels.

Thanks again,
David
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2003\05\22@005332 by Tal

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David,

The data sheet at www.okwelectronics.com/datasheets/DS.0009.pdf
mentions data rate of 50Hz to 4Khz and TTL/CMOS input. I am not sure
exactly what are the input/output requirements, are you suppose to have
some kind of modulation or can you connect directly the RS232 signal and
have it on the other side.

I suggest to contact the manufacturer and ask for more information, or
possibly somebody here on the list has experience with this kind of
modules.

A friend of mine did something similar short time ago, I will try to get
from him info what modules he use and what was the interface.

Tal

> {Original Message removed}

2003\05\22@121548 by Philip Pemberton

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In message <.....NHBBIHFNALDNJOHHLGFMGENPCAAA.dlc7592KILLspamspam@spam@qx.net>>          David Clark <dlc7592spamKILLspamQX.NET> wrote:

> The modules that I am trying to use are an AMRT4 transmitter, & AMHRR3
> receiver, both from http://www.okwelectronics.com.  I have looked at the data
> sheets for both & cannot find any mention of max/recommended bit rate, so I
> do not know the answer to this question.
1200 Baud IIRC.
Have a look at http://www.rfsolutions.co.uk - ISTR they're the original
manufacturers of the AM-RT4 and AM-HRR3. I've got a pair of them lying
around somewhere. They're a pain to work with though. I've had nothing but
trouble getting RS232 data sent over an RF link.

> >What is the interface of your radio link (digital, analog, etc).
> The interface to both the transmitter & receiver are thru MAX232 chips to
> convert the rs-232 to TTL levels.
I hope you're not feeding 12V RS232 into a transmitter module that's only
supposed to accept 5V maximum...

Later.
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2003\05\22@210504 by Tal

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David,

The module my friend use is http://www.laipac.com/easy_900dv_eng.htm and
according to him it does not require external modulation.

Tal


> {Original Message removed}

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