Re: TI-H: Radio Link

To: <ti-hardware@lists.ticalc.org>
Subject: Re: TI-H: Radio Link
From: "Robert Brack" <reb@netride.com>
Date: Mon, 27 Apr 1998 07:37:37 -0500
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: ti-hardware@lists.ticalc.org


>the transmitting part depends on when robert gets me my schematic...  ;)


Shouldabeen today, as soon as my FREE copy of PaperPort 4.0 comes!

>>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...
>>>
>
>

Follow-Ups:

Re: TI-H: Radio Link

From: John Malluck <malluck@bellsouth.net>