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PICList Thread
'[OT] Help Finding Reasonably priced Spread Spectr'
1998\03\05@191855 by Craig Lee

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I'm looking for some reasonably priced modules I can use for
Remote connectivity via a PC and my PIC project.

I've found a couple sources, but the modules are $750 each!

Anyone knowing of anything less than that, I'll buy you a beer!

Craig

1998\03\06@074742 by Mark Lezama

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I have one but is RS-485/422. the advantages are:

1.- You can connect 1 master and 32 slave without any repeter or 1
master and 247 slave with repeters in RS485 mode (half duplex). In
RS-422 mode (full duplex) you can put 10 slave.
2.- It is electrical and optical isolate.
3.- The conection is for 4000 ft.
4.- PC is connect in RS-232 and the other side is RS-485
5.- You dont need RS control.

the disadvantages are:

1.- You need a long cable.
2.- The max baud rate ( I programing ) 19200bps.

Mark Lezama.

Craig Lee escribis:

> I'm looking for some reasonably priced modules I can use for
> Remote connectivity via a PC and my PIC project.
>
> I've found a couple sources, but the modules are $750 each!
>
> Anyone knowing of anything less than that, I'll buy you a beer!
>
> Craig

1998\03\06@092555 by Ryan E. Stafford

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Craig,

Check out http://www.intellon.com they have 900MHz modules for about $300.
Lots of free data also.

Have a nice day! :)
Ryan
***************************************************************************
I do not feel obliged to believe that the same God who has endowed us with
sense, reason, and intellect has intended us to forgo their use. - Galileo
***************************************************************************

1998\03\06@105816 by Ray Gardiner

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>I'm looking for some reasonably priced modules I can use for
>Remote connectivity via a PC and my PIC project.
>
>I've found a couple sources, but the modules are $750 each!
>
>Anyone knowing of anything less than that, I'll buy you a beer!
>

Hi Craig,

Try http://www.tapr.org  they have a current project to
develop a spread spectrum amateur packet radio system.

If it's a kit less than $750 do I still get the beer?


Ray Gardiner (DSP Systems) spam_OUTrayTakeThisOuTspamdsp-systems.com http://www.dsp-systems.com
private email to:- .....rayKILLspamspam@spam@netspace.net.au

1998\03\06@125050 by Craig Webb

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Craig,

I've been checking up on this for a month or so. Check out the HP series at
Linx technologies (to be released next month) - 50kbps for $40US/pair! They
have 8 channels so you could make your own spread spectrum if you need that.

http://www.linxtechnologies.com

Now, about that beer...

Craig

P.S. Great name you've got there!

.At 05:16 PM 3/5/98 -0700, you wrote:
>I'm looking for some reasonably priced modules I can use for
>Remote connectivity via a PC and my PIC project.
>
>I've found a couple sources, but the modules are $750 each!
>
>Anyone knowing of anything less than that, I'll buy you a beer!
>
>Craig
>
>

1998\03\06@131339 by Harrison Cooper

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               Be vary careful here......because it is an AMATEUR
related product, it may not be legal to use in a commercial device.  I
have an app to use a set of RF modems (RS232 input/output), and would be
nice to use a pair of packet modems and radios.  BUT...not quite legal.

                               ----------
                               From:  Ray Gardiner
[SMTP:rayspamKILLspamNETSPACE.NET.AU]
                               Sent:  Friday, March 06, 1998 8:38 AM
                               To:  .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
                               Subject:  Re: [OT]  Help Finding
Reasonably priced Spread Spectrum modules

                       >I'm looking for some reasonably priced modules
I can use for
                       >Remote connectivity via a PC and my PIC
project.
                       >
                       >I've found a couple sources, but the modules
are $750 each!
                       >
                       >Anyone knowing of anything less than that, I'll
buy you a beer!
                       >

                       Hi Craig,

                       Try http://www.tapr.org  they have a current
project to
                       develop a spread spectrum amateur packet radio
system.

                       If it's a kit less than $750 do I still get the
beer?


                       Ray Gardiner (DSP Systems) EraseMErayspam_OUTspamTakeThisOuTdsp-systems.com
http://www.dsp-systems.com
                       private email to:- rayspamspam_OUTnetspace.net.au

1998\03\06@131727 by Craig Lee

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Mark,

I need the modules to be wireless and have a reasonably low current draw in
receive mode.  The reason I need spread spectrum, is that I need a range of
about a mile, and I don't want to have to license each transceiver.  The
baud
rate isn't that important.  19200 would be plenty.

What I have in mind may require 1000+ modules.

So I'm looking for someone who is building these modules for under $100...
or, I'm going to have to get the chipsets and do it myself.

I am interested in your implementation of RS-485 however.  I have another
project where the purpose is to replace a 20mA current loop with something
reasonable.  247 slave units seems like a reasonable maximum in this
application,
and it will be wired.

Regards,

Craig

----------
{Quote hidden}

1998\03\06@135321 by Craig Lee

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Yes, I found that on a web search yesterday.  I thought it was kind of
interesting
so I subscribed to their listserv.

It looks like they are quite a ways through, but I need something that is
on the
market now.

Thanks,

Craig

----------
{Quote hidden}

1998\03\13@142518 by Craig Lee

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Yes Cliff, they do look really nice.  They say that they are capable of 1/4
mile
range too.

I was thinking about the fact that it has 8 channels.  This could be used
quite
intelligently.

One channel could be used for broadcast of messages.  Units in their idle
state
could 'listen' to this channel.  Then in the details of the message, would
include
the channel the slave unit was to respond on, thus minimizing collisions.
Then
there would be a priority channel that could be used for when there was an
alarm
etc.

hmm.... it's coming together.

Craig

----------
> From: Craig Webb <lucidEraseMEspam.....MAGNET.CA>
> To: EraseMEPICLISTspamMITVMA.MIT.EDU
> Subject: Re: [OT]  Help Finding Reasonably priced Spread Spectrum modules
> Date: Friday, March 06, 1998 8:54 AM
>
>
> Craig,
>
> I've been checking up on this for a month or so. Check out the HP series
at
> Linx technologies (to be released next month) - 50kbps for $40US/pair!
They
> have 8 channels so you could make your own spread spectrum if you need
that.
{Quote hidden}

1998\03\13@142523 by Craig Lee

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I was just reading my Electronics Now magazine and on pg. 74 there is
some spread spectrum modules for $199 each.

I did a web search on the name and found that the manufacturer has a
new unit at 2.8 Ghz.  Looks really nice.  It's called the Mercury.

Give it a looksee.

http://www.nomadiccomm.com/_vti_bin/shtml.dll/Default.htm


Craig

1998\03\13@162935 by John Hansen

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At 12:07 PM 3/13/98 -0700, you wrote:
>I was just reading my Electronics Now magazine and on pg. 74 there is
>some spread spectrum modules for $199 each.
>
>I did a web search on the name and found that the manufacturer has a
>new unit at 2.8 Ghz.  Looks really nice.  It's called the Mercury.
>
>Give it a looksee.
>
>http://www.nomadiccomm.com/_vti_bin/shtml.dll/Default.htm
>
>
>Craig
>

This unit looks interesting.  Is this the one that Electronics Now listed
for $199.  If so, that's remarkable.

John Hansen
RemoveMEhansenEraseMEspamEraseMEfredonia.edu

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