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PICList Thread
'[OT] Wireless RF Modules'
1998\03\05@172105 by Herbert Graf

picon face
       I am interested in purchasing wireless RF modules which will connect a P
IC
with display to a PC eventually. If one doesn't know what I am talking
about, the type of item I am interested in is offered by LINX technologies
(http://www.linxtechnologies.com/). I would like to buy their units, but
they are quite far away and after conversion to Canadian dollars it becomes
quite expensive, $70 for one pair. So, I am looking for the same kind of
product, about 250m range, capable of digital and/or analog transmissions,
but cheaper and preferably closer to the Canadian border. If anybody has
ever dealt with other companies that offer similar products I would love to
hear from them. Thank you in advance for any info. TTYL

1998\03\06@023853 by PeterAT&T

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face
Hi,
Try http://www.dvp.com
It is cheaper and way better then linx.
Good luck,
Peter

-----Original Message-----
From: Herbert Graf <spam_OUThgrafTakeThisOuTspamGEOCITIES.COM>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Thursday, March 05, 1998 10:05 PM
Subject: [OT] Wireless RF Modules


>        I am interested in purchasing wireless RF modules which will
connect a PIC
>with display to a PC eventually. If one doesn't know what I am talking
>about, the type of item I am interested in is offered by LINX technologies
>(http://www.linxtechnologies.com/). I would like to buy their units, but
>they are quite far away and after conversion to Canadian dollars it becomes
>quite expensive, $70 for one pair. So, I am looking for the same kind of
>product, about 250m range, capable of digital and/or analog transmissions,
>but cheaper and preferably closer to the Canadian border. If anybody has
>ever dealt with other companies that offer similar products I would love to
>hear from them. Thank you in advance for any info. TTYL

1998\03\06@125022 by John A. Craft

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face
Try the Virtual Wire from RF Monolithics


http://www.rfm.com

It uses a '84 to packetize the data.

jc.

>        I am interested in purchasing wireless RF modules which will
connect a PIC
>with display to a PC eventually. If one doesn't know what I am talking
>about, the type of item I am interested in is offered by LINX technologies
>(http://www.linxtechnologies.com/). I would like to buy their units, but
>they are quite far away and after conversion to Canadian dollars it becomes
>quite expensive, $70 for one pair. So, I am looking for the same kind of
>product, about 250m range, capable of digital and/or analog transmissions,
>but cheaper and preferably closer to the Canadian border. If anybody has
>ever dealt with other companies that offer similar products I would love to
>hear from them. Thank you in advance for any info. TTYL
>

1998\03\06@125047 by Craig Webb

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face
Try Abacom Technologies 416-242-3120. They have a good faxback service at
416-242-3082. They distribute radio-tech products (http://www.radio-tech.co.uk) and
sell some comparative modules (and some cheaper though not as fast as the
new Linx HP series in terms of data rates for the price).

C. Webb

At 05:04 PM 3/5/98 -0500, you wrote:
>        I am interested in purchasing wireless RF modules which will
connect a PIC
{Quote hidden}

1998\03\06@131724 by Craig Lee

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face
Try RF Monolithics.  http://www.rfm.com Their transmitter is about $5US and
the receiver is about $7US.
They are in the 900 MHz range.  However, you'll have to add a handful of
external components if you don't
buy their full system. Coils, caps, transistors, antenna, etc.  I think the
baud rate can go to about 10K.

They do have a development kit with two transceiver boards, at89C251
microcontrollers,
and some level shifting to the PC serial port.  I think the kit is about
$200US.

Give them a look see.

I need a bit more range than the DOC will allow without a license.  So I'm
trying to find some spread spectrum
modules that are reasonably priced.  The best price I can find so far is
about $750 each!

Later,

Craig

----------
> From: Herbert Graf <.....hgrafKILLspamspam.....GEOCITIES.COM>
> To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
> Subject: [OT] Wireless RF Modules
> Date: Thursday, March 05, 1998 3:04 PM
>
>
>         I am interested in purchasing wireless RF modules which will
connect a PIC
> with display to a PC eventually. If one doesn't know what I am talking
> about, the type of item I am interested in is offered by LINX
technologies
> (http://www.linxtechnologies.com/). I would like to buy their units, but
> they are quite far away and after conversion to Canadian dollars it
becomes
> quite expensive, $70 for one pair. So, I am looking for the same kind of
> product, about 250m range, capable of digital and/or analog
transmissions,
> but cheaper and preferably closer to the Canadian border. If anybody has
> ever dealt with other companies that offer similar products I would love
to
> hear from them. Thank you in advance for any info. TTYL

1998\03\06@135050 by DREITEK

picon face
In a message dated 98-03-06 01:05:25 EST, you write:

<<
        I am interested in purchasing wireless RF modules which will connect
a PIC
with display to a PC eventually. If one doesn't know what I am talking
about, the type of item I am interested in is offered by LINX technologies
(http://www.linxtechnologies.com/). I would like to buy their units, but
they are quite far away and after conversion to Canadian dollars it becomes
quite expensive, $70 for one pair. So, I am looking for the same kind of
product, about 250m range, capable of digital and/or analog transmissions,
but cheaper and preferably closer to the Canadian border. If anybody has
ever dealt with other companies that offer similar products I would love to
hear from them. Thank you in advance for any info. TTYL
 >>
Hello,
I have never used them but the TECH flier for February listed modules capable
of data or audio for about $10 US each.  They didn't give any other data on
them.  I was thinking of getting a pair to play with.
TECH is a division of Radio Shack.

Dave Duley

1998\03\06@142610 by Craig Lee

flavicon
face
Interesting, because I have the Virtual Wire kit, and the processor is
the AT89C2051 from Atmel.

Did they change chips?


Craig

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

technologies
> >(http://www.linxtechnologies.com/). I would like to buy their units, but
> >they are quite far away and after conversion to Canadian dollars it
becomes
> >quite expensive, $70 for one pair. So, I am looking for the same kind of
> >product, about 250m range, capable of digital and/or analog
transmissions,
> >but cheaper and preferably closer to the Canadian border. If anybody has
> >ever dealt with other companies that offer similar products I would love
to
> >hear from them. Thank you in advance for any info. TTYL
> >

1998\03\06@151003 by ndie Ohtsji [4555]

flavicon
face
Hi Craig,

Do you know what the range of the 900MHz devices can deliver.
I have a similar application which I wish to transmit at a distance of
about 800 meters (1/2 mile).

What is the DOC (now Industry Canada) and FCC limit without a license
in the 900MHz band?

Was also hoping to use the Linx HP series Tx & Rx modules.

-Randie (Also stuck in Canada and hoping to find a cheaper source
of Tx/Rx modules)

KILLspamrohtsjiKILLspamspamglenayre.com


> From RemoveMEcraigleeTakeThisOuTspamAGT.NET Fri Mar  6 10:22:08 1998
>
> Try RF Monolithics.  http://www.rfm.com Their transmitter is about $5US and
> the receiver is about $7US.
> They are in the 900 MHz range.  However, you'll have to add a handful of
> external components if you don't

> I need a bit more range than the DOC will allow without a license.  So I'm

1998\03\06@180445 by Ryan E. Stafford

flavicon
face
I believe the unliciensed 900MHz band is restricted to 30mW xmitter output
in the USA.  The actual frequency is also important, i.e. 915MHz.  With a
3db antenna and line-of-sight you should be good for 1 mile.  Remember
antenna placement, to escape ground effects it needs to be about 35 feet up.
Each country has differing requirements.  The 2.4GHz band seems to be the
most liberial worldwide.  Search for "FCC" and I'm sure you will find more
than you really wanted to know.

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@185408 by Craig Lee

flavicon
face
> Do you know what the range of the 900MHz devices can deliver.
> I have a similar application which I wish to transmit at a distance of
> about 800 meters (1/2 mile).

It's 902-928 Mhz.

>
> What is the DOC (now Industry Canada) and FCC limit without a license
> in the 900MHz band?

Because spread spectrum is frequency hopping, and it doesn't 'JAM' anything
due to it's transmission methodology, there is no license requirement. I
think
FCC part 47 mentions this.


{Quote hidden}

and
> > the receiver is about $7US.
> > They are in the 900 MHz range.  However, you'll have to add a handful
of
> > external components if you don't
>
> > I need a bit more range than the DOC will allow without a license.  So
I'm

1998\03\06@220716 by Tom Mariner

flavicon
face
> > What is the DOC (now Industry Canada) and FCC limit without a license
> > in the 900MHz band?
>
> Because spread spectrum is frequency hopping, and it doesn't 'JAM'
anything
> due to it's transmission methodology, there is no license requirement. I
> think
> FCC part 47 mentions this.

CRF 47 part 15.247 - I Watt, also Direct Sequence modulation. Antenna gain
limited to 6dB FCC. No license, but type acceptance for the tx. Under ideal
circumstances 20 miles is achievable reliably.

Tom
>

1998\03\06@220731 by Tom Mariner

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face
The frequency bands 902-928, 2.45GHz and 5.8 GHz, when used with certain
restrictions in two methods of spread spectrum modulation can have a
theoretical maximum of 1W US. The 2.4 and 5.8 GHz bands generally overlap
in Europe where the limit is half that and in Japan where the limit is
generally 100 mw. In addition, there are more restrictions on antenna gain
in Europe / Japan than in the US.

Tom

On Friday, March 06, 1998 4:13 PM, Ryan E. Stafford
[SMTP:RemoveMEryanspamTakeThisOuTBROWNINTL.COM] wrote:
> I believe the unliciensed 900MHz band is restricted to 30mW xmitter
output
> in the USA.  The actual frequency is also important, i.e. 915MHz.  With a
> 3db antenna and line-of-sight you should be good for 1 mile.  Remember
> antenna placement, to escape ground effects it needs to be about 35 feet
up.
> Each country has differing requirements.  The 2.4GHz band seems to be the
> most liberial worldwide.  Search for "FCC" and I'm sure you will find
more
> than you really wanted to know.
>
> 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@221548 by Sean Breheny

face picon face
At 03:13 PM 3/6/98 -0600, you wrote:
>I believe the unliciensed 900MHz band is restricted to 30mW xmitter output
>in the USA.  The actual frequency is also important, i.e. 915MHz.  With a
>3db antenna and line-of-sight you should be good for 1 mile.  Remember
>antenna placement, to escape ground effects it needs to be about 35 feet up.

<SNIP>

35 feet??! I'm not an expert on RF, but I do seem to remember that the
general rule of thumb for antennas is that the separation between them and
the ground should be some multiple of their wavelength, and for the 146 MHz
band, 6 feet is usually considered enough(if I remember correctly), so I
would hardly think that the minimum distance for 900MHz would be greater! I
could be wrong, just curious as to where 35 feet came from.

Sean

+--------------------------------+
| Sean Breheny                   |
| Amateur Radio Callsign: KA3YXM |
| Electrical Engineering Student |
+--------------------------------+
Fight injustice, please look at
http://homepages.enterprise.net/toolan/joanandrews/

Personal page: http://www.people.cornell.edu/pages/shb7
shb7EraseMEspam.....cornell.edu
Phone(USA): (607) 253-0315

1998\03\07@110414 by Craig Webb

flavicon
face
These modules aren't cheap ($1250 US each!), but if you want 20 miles (!),
try Freewave technologies. They run up to 115 kbps spread spectrum, and are
all set up for RS232.

http://www.freewave.com

Craig Webb

At 10:50 AM 3/6/98 -0800, you wrote:
{Quote hidden}

1998\03\07@135833 by Ranna M. V.

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picon face
Dear Criag,
At 08:41 AM 3/6/98 -0700, you wrote:
>Try RF Monolithics.  http://www.rfm.com Their transmitter is about $5US and
>the receiver is about $7US.
(sbip)

I am interseted in using them, Is this price in single piece units?

Thank you,
Ranna M. V.
Consultant Engineer

NEURON SYSTEMS
4/77, 13th Main Road,                        Tel/Fax:+91-80-529 6071
HAL 2nd Stage, Bangalore 560 008             E.Mail: RemoveMErannaspam_OUTspamKILLspampobox.com
INDIA

1998\03\07@161842 by Craig Lee

flavicon
face
Well the antenna is made in such a way that the groundplane is simulated
6 feet below the tip of the antenna.

----------
> From: Sean Breheny <RemoveMEshb7TakeThisOuTspamspamCORNELL.EDU>
> To: EraseMEPICLISTspamspamspamBeGoneMITVMA.MIT.EDU
> Subject: Re: [OT] Wireless RF Modules
> Date: Friday, March 06, 1998 8:14 PM
>
>
> At 03:13 PM 3/6/98 -0600, you wrote:
> >I believe the unliciensed 900MHz band is restricted to 30mW xmitter
output
> >in the USA.  The actual frequency is also important, i.e. 915MHz.  With
a
> >3db antenna and line-of-sight you should be good for 1 mile.  Remember
> >antenna placement, to escape ground effects it needs to be about 35 feet
up.
>
> <SNIP>
>
> 35 feet??! I'm not an expert on RF, but I do seem to remember that the
> general rule of thumb for antennas is that the separation between them
and
> the ground should be some multiple of their wavelength, and for the 146
MHz
{Quote hidden}

1998\03\07@161845 by Craig Lee

flavicon
face
I think their price list is on the web site.

I believe the prices are based on production quantities, but you can
definetly get some samples.

Just check out their website.

Craig

----------
> From: Ranna M. V. <rannaSTOPspamspamspam_OUTBLR.VSNL.NET.IN>
> To: spamBeGonePICLISTSTOPspamspamEraseMEMITVMA.MIT.EDU
> Subject: Re: [OT] Wireless RF Modules
> Date: Friday, March 06, 1998 3:19 PM
>
>
> Dear Criag,
> At 08:41 AM 3/6/98 -0700, you wrote:
> >Try RF Monolithics.  http://www.rfm.com Their transmitter is about $5US
and
{Quote hidden}

1998\03\08@043004 by mats

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face
Craig Lee wrote:
{Quote hidden}

this discussion hass deteriorated into discussions that have very little
substans.can anybody present a solution that makes a fast rf link
between to networkcards or a wireless modem.get real.instead of talking
about antenna spacing from ground.everyone with knowledge about rf
knows that trial and error togetherwith some knowledge is what yealds.

1998\03\08@154604 by Craig Lee

flavicon
face
I phhart in your general direction. (Monty Python - The Holy Grail)

I'm sorry folks, I just couldn't help myself (;>

Craig

----------
> From: s-33963 <.....matsspam_OUTspamSOBER.PP.SE>
> To: TakeThisOuTPICLIST.....spamTakeThisOuTMITVMA.MIT.EDU
> Subject: Re: [OT] Wireless RF Modules
> Date: Sunday, March 08, 1998 2:28 AM
> this discussion hass deteriorated into discussions that have very little
> substans.can anybody present a solution that makes a fast rf link
> between to networkcards or a wireless modem.get real.instead of talking
> about antenna spacing from ground.everyone with knowledge about rf
> knows that trial and error togetherwith some knowledge is what yealds.

1998\03\09@123640 by SHAWN ELLIS
flavicon
face
> Craig Lee wrote:
> this discussion hass deteriorated into discussions that have very little
> substans.can anybody present a solution that makes a fast rf link
> between to networkcards or a wireless modem.get real.instead of talking
> about antenna spacing from ground.everyone with knowledge about rf
> knows that trial and error togetherwith some knowledge is what yealds.
>
Wow, your obviously a brain-child judgeing by your typing/spelling
skills.  Mabye we should all bow down and ask your forgiveness for
wasting your time/screen space.

I, for one, don't know much about RF and I enjoyed that thread.  If
you don't like it, just delete the message and keep your
poorly-composed, naysaying replies off MY screen!

No offense intended, of course....

1998\03\09@133342 by Dan Larson

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face
My $.02....

I have lately been attracted to mailing lists because of the lack of
flame wars, SPAM, and other bandwidth wasters.  This is in sharp contrast
the the worsening condition of the Usenet groups.

IMHO off-topic threads are fine once in a while.  They *can* be informative
and serve the general interests of all.  Keep in mind the clause "in the
general interests of all".  It is a key qualifier.  A good laugh now and then,
or a side discussion of RF, IR, etc don't bother me at all.  In fact, such
threads
give the list more life and more depth. Keep in mind also that it would be very
difficult to keep up with all of the many different topics if each was in
a separate list. If the list were strictly and completely on topic at all times,
it would also be dull and flat.  When things degrade into a flame war the
mailing
list becomes no better than the aforementioned Usenet.

So far I have enjoyed this list immensely, and hope that I can continue to do
so!
The general intelligence level of this far exceeds any where else on the 'net.
No body who has posted to this list since I have subscribed has yet earned a
place in my "trash filter".

Dan

On Mon, 9 Mar 1998 11:27:14 EST5EDT, SHAWN ELLIS wrote:

{Quote hidden}

*******************************
* Dan Larson                  *
* Software Engineer           *
* Micro Control Company       *
* email: TakeThisOuTdlarsonKILLspamspamspamcitilink.com *
*******************************

1998\03\09@133345 by mats

flavicon
face
SHAWN ELLIS wrote:
>
> > Craig Lee wrote:
> > this discussion hass deteriorated into discussions that have very little
> > substans.can anybody present a solution that makes a fast rf link
> > between to networkcards or a wireless modem.get real.instead of talking
> > about antenna spacing from ground.everyone with knowledge about rf
> > knows that trial and error togetherwith some knowledge is what yealds.
> >
> Wow, your obviously a brain-child judgeing by your typing/spelling
> skills.  Mabye we should all bow down and ask your forgiveness for
> wasting your time/screen space.
>
> I, for one, don't know much about RF and I enjoyed that thread.  If
> you don't like it, just delete the message and keep your
> poorly-composed, naysaying replies off MY screen!
>
> No offense intended, of course....
as far as i know maybe is not spelled mabye so check your own faults
before you try to be smart.And furthermore if you were to write in
another language than your own like danish or polish,i just wonder
what it would look like.So at the same time you enrole for that basic
RF class you might to try and learn some other language.But you are
obviosly to busy with your typing class.keep up the good work.
Some day who knows you could even learn something exept being uptight.
Ever heard about a camel coming through a .........

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