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'Very low power transmitter'
2004\07\09@103133 by Mark E. Skeels

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You didn't say it had to be in the 450MHz range, so if it's a one off, you
might look at TI's TRF6901 demo boards.

http://focus.ti.com/docs/toolsw/folders/print/msp-trf6901-demo.html

They run in the 900 MHz range, and you can select from 16 frequencies.

It comes with an on-board MSP430 flash uP and source code for a simple game.

I think it's $100.00 for two modules, with onboard copper antennas.

The pcb has some options and some leds and switches, as well as layout for
RS-232 connections.

It works well out of the box.

Mark



{Original Message removed}

2004\07\09@103512 by Mark E. Skeels

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Oops, sorry, you did say 100 to 500 MHz..........

Mark

----- Original Message -----
From: "Mark E. Skeels" <spam_OUTmeskeelsTakeThisOuTspamEARTHLINK.NET>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Friday, July 09, 2004 9:31 AM
Subject: Re: Very low power transmitter


> You didn't say it had to be in the 450MHz range, so if it's a one off, you
> might look at TI's TRF6901 demo boards.
>
> http://focus.ti.com/docs/toolsw/folders/print/msp-trf6901-demo.html
>
> They run in the 900 MHz range, and you can select from 16 frequencies.
>
> It comes with an on-board MSP430 flash uP and source code for a simple
game.
{Quote hidden}

500
> > MHz (does not have to have a flat output power level across the entire
> > spectrum)
> > Needs to be capable of  about 1.25 to 2.5 KHz deviation (sine wave or
> > something close, squareish waves would be a plus) in the low  audio
range.
> > Transmit frequency needs to be controllable via a micro-controller
(again
{Quote hidden}

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2004\07\09@104139 by John J. McDonough

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Take a look at the TRF4400.  This chip has a DDS and an amplifier on board
and costs about $5.  It has the capability of accepting a modulation signal
as well, presuming that you want to modulate it with data.  I think TI may
have a matching receiver.  Although the spec indicates it is for the 450 MHz
range only, I know of one person who has successfully used it down to 50 MHz
or so.  It's available from Digikey.  the TRF4900 appears to be the same
thing for the 920 MHz neighborhood.

72/73 de WB8RCR    http://www.qsl.net/wb8rcr
didileydadidah     QRP-L #1446 Code Warriors #35


{Original Message removed}

2004\07\09@104141 by 4HAZ

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----- From: "Mark E. Skeels" <meskeels@e

> You didn't say it had to be in the 450MHz range, so if it's a one off, you
> might look at TI's TRF6901 demo boards.

Actually I said  "across the spectrum of  ~100 to 500 MHz"  this means
microprocessor controllable across the range of ~100 to 500MHz. Thank you
for trying but 900MHz 16 channel is nowhere close to what I specified.

> http://focus.ti.com/docs/toolsw/folders/print/msp-trf6901-demo.html
>
> They run in the 900 MHz range, and you can select from 16 frequencies.
>
> It comes with an on-board MSP430 flash uP and source code for a simple
game.
{Quote hidden}

> {Original Message removed}

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