Re: TI-H: Radio Link
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Re: TI-H: Radio Link
the transmitting part depends on when robert gets me my schematic... ;)
>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...
>>