Re: TI-H: Radio Link


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Re: TI-H: Radio Link




oooh yah, that's my kinda cash :>
what kinda range can we do (legally) on this thing in the lower 48 (or does
it vary?)

-- Jon Olson


-----Original Message-----
From: Grant Stockly <gussie@alaska.net>
To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
Date: Monday, April 27, 1998 7:35 PM
Subject: RE: TI-H: Radio Link


>
>I've decided to change my plan...  I'm throwing out 38400 and using 300.
>Then the entire radio link will cost under $10 to make...and still have the
>same range...
>
>>Hi Grant!
>>
>>What modulation scheme are you using (amplitude, frequency, phase, pulse
>>duration, etc) ?  If it costs $80 for a pair, then you must be buying RF
>>modules and building the interface to your calc (or making the whole thing
>>but using a lot of expensive components that you may not need).  If you
>>are getting 38400, you must be using quadrature phase modulation at 2GHz.
>>Are you using a digital phase locked loop and VCO module?  I know that
>>there is a 902-928MHz band that you can use without a license, but you
>>can't transmit more that 100mW.  Give me more details.  I was going to
>>work on one this summer and would like to see your approach.  My plan is
>>to use the same technique as cell phones.  They transmit a lot of digital
>>data and use few expensive components.
>>
>>What is your plan for the PCB's?  If you get high data rates you have to
>>control the characteristic impedance of the traces carrying the RF
>>signals.  Do you etch your own boards?  One sided or two?  So many
>>questions...
>>
>>Mike
>>
>>
>>
>>-----Original Message-----
>>From:   Grant Stockly [SMTP:gussie@alaska.net]
>>Sent:   Saturday, April 25, 1998 7:58 PM
>>To:     ti-hardware@lists.ticalc.org
>>Subject:        TI-H: Radio Link
>>
>>
>>So far I was able to construct a perfect working link that operates at
>>about 38400 and transmits arround a few miles...  The problem is that 2
>>cost $80...
>