The Nordic chips will do 20-metres. They're virtually de facto for low-cos=
t 2.4ghz radios (toys, proprietary remote controls, industrial).=20

Their Gazelle protocol provides a lot more functionality than a "cable repl=
acement" variety module - but you may not need multiple channels and pseudo=
-mesh :)

-m

Sent from my iPhone

> On Sep 27, 2014, at 4:48 PM, KPL <kpl.listes@gmail.com> wrote:
>=20
> These are duplex systems, it seems? What are the real-world specs,
> would they be able to reliably communicate over a distance of about 20
> meters?
> Speed is not an issue.
> I was going to use cheap routers like TP-Link WR703N, but looks like
> they have very poor wifi coverage.
>=20
>> On Sat, Sep 27, 2014 at 10:49 PM, Allen Mulvey <allen@amulvey.com> wrote=
:
>> nRF24L01+ modules at 2.4 GHZ are getting popular. I have been using them=
 for
>> local telemetry for a number of months. You can get really cheap rip-off=
s on
>> eBay to experiment with.  I believe you can use the first 83 channels in=
 the
>> USA. Logitech uses this band for its wireless keyboards and mice.
>>=20
>> With rubber antenna:
>> http://www.ebay.com/itm/NRF24L01-PA-LNA-SMA-Antenna-Wireless-Transceiver=
-com
>> munication-module-2-4G-1100m-/310651702557?pt=3DLH_DefaultDomain_0&hash=
=3Ditem48
>> 5448cd1d
>>=20
>> With PCB antenna:
>> http://www.ebay.com/itm/10PCS-Arduino-NRF24L01-2-4GHz-Wireless-RF-Transc=
eive
>> r-Module-New-/170819069271?pt=3DLH_DefaultDomain_0&hash=3Ditem27c59c2557
>>=20
>> Allen
>>=20
>>> -----Original Message-----
>>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behal=
f
>> Of
>>> meshka7
>>> Sent: Saturday, September 27, 2014 12:50 PM
>>> To: piclist@mit.edu
>>> Subject: [EE] Experimenting with RF modules
>>>=20
>>> Got two RF modules off ebay. One for 433 MHz and another for 915. My
>>> intention was to experiment with RF and remote control.
>>>=20
>>> Looking into band allocations in the US, I found that these frequencies
>> fall
>>> into the amateur bands. Wikipedia shows that 433 is for ISM but only
>> within
>>> Region 1, so I guess I'm left only with 915.
>>>=20
>>> Am I correct here? What bands do people generally use for experimenting=
 or
>>> making home made gadgets that use RF and that won't be sold commerciall=
y?
>>>=20
>>> Thanks!
>>>=20
>>>=20
>>>=20
>>> --
>>> View this message in context:
>> http://microcontrollers.2385.n7.nabble.com/EE-
>>> Experimenting-with-RF-modules-tp192230.html
>>> Sent from the MicroControllers - PIC mailing list archive at Nabble.com=
..
>>> --
>>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>>> View/change your membership options at
>>> http://mailman.mit.edu/mailman/listinfo/piclist
>>=20
>>=20
>> --
>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>=20
>=20
>=20
> --=20
> KPL
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

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