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'[EE] Wireless with the MRF49XA'
2010\02\02@175331 by Vitaliy

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www.microchip.com/wwwproducts/Devices.aspx?dDocName=en541404

Has anyone done a project with this chip?

It looks insanely cheap for the performance you get, I'm trying to
understand what the catch is. What is the (approximate) range?

Vitaliy

2010\02\02@202520 by John Hansen

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With a 7dBm power output (~5 mw) the range is not going to be very far!

John

On Tue, Feb 2, 2010 at 5:52 PM, Vitaliy <spam_OUTpiclistTakeThisOuTspammaksimov.org> wrote:

> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en541404
>
> Has anyone done a project with this chip?
>
> It looks insanely cheap for the performance you get, I'm trying to
> understand what the catch is. What is the (approximate) range?
>
> Vitaliy
>
> -

2010\02\03@033631 by Ruben Jönsson

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Have you looked at the MRF24J40MA module for the 2.4GHz ISM band?

Complete module with integrated pcb antenna and matching circuit, crystal and
voltage regulator for less than 10$. FCC, IC and ETSI compliant and with
regulatory approvals for modular devices.

<search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=MRF24J40MA-
I/RM-ND>

Range is up to 400m (outside, line of sight according to the datasheet).

Can be used with microchips zigbee or miwi (p2p) stack.

I have not used it yet but am planning to do some experiments for a wireless
"intelligent home network" that initially uses temperature sensors and switches
to do in-house room to room heating management.

/Ruben


> www.microchip.com/wwwproducts/Devices.aspx?dDocName=en541404
>
> Has anyone done a project with this chip?
>
> It looks insanely cheap for the performance you get, I'm trying to
> understand what the catch is. What is the (approximate) range?
>
> Vitaliy
>
> -

2010\02\03@110154 by Vitaliy

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Ruben,

Yes we have, MRF24J40MA will be plan B. The big difference is cost, for the
two sides you need $20, vs. about $6 for the MRF49XA (this includes the cost
of passives + PCB + building the module, but not FCC certification).

We may end up using both, but saving $14 per device is very tantalizing and
for the particular application we have in mind, range can be sacrificed (15
ft LOS would be plenty) and communication is point-to-point (not mesh).

Please remember to share your experience with the MRF24J40MA once you get
around to playing with it. :)

Vitaliy


{Original Message removed}

2010\02\03@115047 by M.L.

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On Wed, Feb 3, 2010 at 12:01 PM, Vitaliy <.....piclistKILLspamspam@spam@maksimov.org> wrote:
> Ruben,
>
> Yes we have, MRF24J40MA will be plan B. The big difference is cost, for the
> two sides you need $20, vs. about $6 for the MRF49XA (this includes the cost
> of passives + PCB + building the module, but not FCC certification).
>

The MRF24J40MA does not require extra FCC certification because it is
already certified as a modular device, right?

--
Martin K.

2010\02\03@123201 by Mark E. Skeels

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So have you seen this?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1000-ND

Mark

Vitaliy wrote:
{Quote hidden}

> {Original Message removed}

2010\02\03@130720 by Vitaliy

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John Hansen wrote:
> With a 7dBm power output (~5 mw) the range is not going to be very far!

Sparkfun claims 500 m range w/ 10 mW output:

http://www.sparkfun.com/commerce/product_info.php?products_id=155

Vitaliy

2010\02\03@130847 by Vitaliy

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M.L. wrote:
>> Yes we have, MRF24J40MA will be plan B. The big difference is cost, for
>> the
>> two sides you need $20, vs. about $6 for the MRF49XA (this includes the
>> cost
>> of passives + PCB + building the module, but not FCC certification).
>>
>
> The MRF24J40MA does not require extra FCC certification because it is
> already certified as a modular device, right?

Correct.

Vitaliy

2010\02\03@130848 by Vitaliy

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No, I have not.

----- Original Message -----
From: "Mark E. Skeels" <mskeelsspamKILLspamcompetitionelectronics.com>
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam.....MIT.EDU>
Sent: Wednesday, February 03, 2010 10:34
Subject: Re: [EE] Wireless with the MRF49XA


So have you seen this?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1000-ND

Mark

2010\02\03@131603 by Vitaliy

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Mark E. Skeels wrote:
> So have you seen this?
>
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1000-ND

At first glance, based on the feature set and price, this may be the one we
end up using. Do you have any experience with it?

Vitaliy

2010\02\03@132735 by Marcel Duchamp

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On 2/2/2010 2:52 PM, Vitaliy wrote:
> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en541404
>
> Has anyone done a project with this chip?
>
> It looks insanely cheap for the performance you get, I'm trying to
> understand what the catch is. What is the (approximate) range?
>
> Vitaliy
>

yatc... yet another transceiver chip:
ALPHA-TRX915S-ND (@digikey: $7.35/ea)

Digikey is out of stock on this as I bought their last 4.  Only gottem
yesterday so don't know anything about them yet.

2010\02\03@133354 by Mark E. Skeels

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Nope, but I just received an inquiry yesterday for project that could
use a unit like this.....

But I don't think I will put it with a PSOC.  :-)

Mark Skeels
Engineer
Competition Electronics, Inc.
TEL: 815-874-8001
FAX: 815-874-8181
http://www.competitionelectronics.com


Vitaliy wrote:
{Quote hidden}

2010\02\03@133932 by Ariel Rocholl

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I have some relevant experience with ISM modules from different vendors, and
I can tell you 500m with 10mW LOS is very optimistic. You may get that but
you will need a lot of effort on a good directional antenna both sides, and
low bit rate. If you really need 500m with 10mW think better on 433mhz which
propagates way better than 2.4ghz.

2010/2/3 Vitaliy <EraseMEpiclistspam_OUTspamTakeThisOuTmaksimov.org>

> John Hansen wrote:
> > With a 7dBm power output (~5 mw) the range is not going to be very far!
>
> Sparkfun claims 500 m range w/ 10 mW output:
>
> http://www.sparkfun.com/commerce/product_info.php?products_id=155
>
> Vitaliy
>
> -

2010\02\03@153748 by Ariel Rocholl

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Not sure why I thought you were pointing to 2.4ghz module from Microchip.
Anyway, you can get 500m with 10mW in 433mhz but more on the 1200-2400bps
than 9600bps as advertised by Sparkfun. Take a look on the BER charts to see
how Frequency, Bit rate and receiver sensitivity will influence your range.

2010/2/3 Ariel Rocholl <forosspamspam_OUTarocholl.com>

{Quote hidden}

>> --

2010\02\03@185844 by YES NOPE9

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How about something from TI  like the CC111F8, CC1111F32,  
CC1111F16 , .............
http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?&familyId=935&uiTemplateId=NODE_STRY_PGE_T&techFamId=null&rootFamilyId=null&sectionId=null&tabId=null&appId=null&viewDeviceCallingPage=null&totalCount=15&showAdditionalParameters=no&parameter=2600904385&lc=3000949&lc=3000944&lc=3000946&lc=3000945&lc=3000947&lc=3000874&lc=3000419&lc=3000950&lc=2001694&lc=2201696&lc=2001698&lc=2201700&lc=2001699&lc=2001697&compare=yes&download=yes&sort=yes&customize=yes&paramResults=yes&paramCriteria=yes&familyTree=yes&military=no&baSystem=yes&paramTable=no&sortOption=PA_PARAMETER_2200062&sortMode=DESC&searchPaths=1000935&pageId=undefined&templateId=0&navigationId=0&family=analog&paramTable=no&military=no&&uiTemplateId=NODE_STRY_PGE_T&techFamId=null&rootFamilyId=null&sectionId=null&tabId=null&appId=null&viewDeviceCallingPage=null&resetCompare=true#sdp


OR
NFC chips
http://www.nxp.com/news/content/file_1641.html
http://embedded-system.net/nxp-unveils-pn544-nfc-controller-chip.html

Sorry if I missed the mark
gus

2010\02\03@225537 by William \Chops\ Westfield

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On Feb 3, 2010, at 9:34 AM, Mark E. Skeels wrote:

>
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1000-ND

Are "wireless USB" transceivers useful for general purpose radio comm?

BillW

2010\02\04@021040 by Ruben Jönsson

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>
> On Feb 3, 2010, at 9:34 AM, Mark E. Skeels wrote:
>
> >
> > search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1000-ND
>
> Are "wireless USB" transceivers useful for general purpose radio comm?
>
> BillW
>

>From what I can see in the data sheet, the only thing that is related to USB is
its ability to automatically append each package with a CRC16 that uses the
"USB CRC polynomial" and also verify the received packages against this CRC.

Communication with the chip is done through a standard SPI interface.

However, the manufacturer also makes a wireless USB dongle -

<http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=748-1002-ND>

which is supposed to directly communicate with the "wireless USB" transceiver
(and apparently also contains one).

To me, the name "wireless USB" transceiver is quite missleading and if I would
have done a google search for a generic RF transceiver I don't think I would
have followed a link that contains the name "wireless USB".

/Ruben


==============================
Ruben Jönsson
AB Liros Electronic
Box 9124, 200 39 Malmö, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
KILLspamrubenKILLspamspampp.sbbs.se
==============================

2010\02\04@084431 by Mark E. Skeels

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Link through to the datasheet. The description is incorrect.

Mark Skeels
Engineer
Competition Electronics, Inc.
TEL: 815-874-8001
FAX: 815-874-8181
http://www.competitionelectronics.com


William "Chops" Westfield wrote:
{Quote hidden}

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