RF Serial data transmitter
Steven Frankel
it's not 2 ft.). Price is very important. Any recommendations?
David Too
4kbits/sec to 64kbits/sec up to 20metres (over 50ft).
(Not affiliated, just a happy "customer")
David.
"Steven Frankel" <TSFr...@hotmail.com> wrote in message
news:kbOy5.12024$u6.3...@typhoon1.ba-dsg.net...
David Too
Check out http://www.computronics.com.au/misc/t-r_pair.html
Transmitter and receiver are available for separate purchase. I know this
is Australian stuff, but with the current Ozzie dollar crisis, if your'e in
US you should be able to get them for a steal!
FLCmicro stuff is a transceiver (two-way comms).
David.
"David Too" <da...@daves-domain.com> wrote in message
news:bopz5.4$SO4...@wa.nnrp.telstra.net...
Steven Frankel
plus?
thanks
Steven Frankelnews:rvpz5.5$SO4...@wa.nnrp.telstra.net...
Stuart Leslie
and TX-99). They are about $10 apiece at Digikey and run at 300Mhz. I have just
started using them by connecting directly to microcontroller (AVR's) TX and RX
pins and have no trouble at 1200 bps traveling a hundred feet or so around my
house(could be further but thats as far as I went). They claim 1200 bps and a
range of 300 feet. They were very easy to hook up and don't require any other
components. Some of the tests I have done indicate they may get 2400 bps or
better but it's still early to tell. If you find something cheaper/better let me
know.
Stuart Leslie
William Pollock
"Stuart Leslie" <sle...@mindspring.com> wrote in message
news:39CE7EED...@mindspring.com...
> I just got a pair of Ming Microsystems transmitter and receiver boards
(RE-99
> and TX-99). They are about $10 apiece at Digikey and run at 300Mhz. I have
just
> started using them by connecting directly to microcontroller (AVR's) TX
and RX
> pins and have no trouble at 1200 bps traveling a hundred feet or so around
my
> house(could be further but thats as far as I went). They claim 1200 bps
and a
> range of 300 feet. They were very easy to hook up and don't require any
other
> components. Some of the tests I have done indicate they may get 2400 bps
or
> better but it's still early to tell. If you find something cheaper/better
let me
> know.
>
> Stuart Leslie
>
did these boards require any additional components, or are they all that one
would need to do this.
Thanks in advance, Will Pollock
Steven Frankel
supply and antenna.
"William Pollock" <cry...@earthlink.net> wrote in message
news:qyVz5.23142$Vu5.8...@newsread2.prod.itd.earthlink.net...
David Too
feet). Also, note that these are quoted with 1foot wire antenna. This is
generally to stay within allowable radiation levels to stay in a class
license band.
However, you can trade of directionality and gain, in other words if you
don't need omnidirectional, but you are doing point to point (or even omni
one way and point another), you can get the gain up using a directional
antenna etc.
But even sticking to omni directional, with a proper 1/2 wave dipole
antenna, you'd probably double the range without any hassles....
Experimentation is the key here.
D.
"Steven Frankel" <TSFr...@hotmail.com> wrote in message
news:iYqz5.10892$T6.4...@typhoon2.ba-dsg.net...
Stuart Leslie
The transmitter requires nothing. Just a 3 pin connector to VCC, Ground
and data pin. The receiver is same but they recommend adding a 1/4 wave
antenna (short piece of hookup wire) but it seems to work fine without
it at shorter distances. The transmitter can have an antenna added if
you need, but it comes with a loop on the PC board that does the trick
for most applications. No components required though.
-Stuart Leslie
William Pollock
"Stuart Leslie" <s...@4sightinc.com> wrote in message
news:39D0F9FD...@4sightinc.com...
> William,
>
> The transmitter requires nothing. Just a 3 pin connector to VCC, Ground
> and data pin. The receiver is same but they recommend adding a 1/4 wave
> antenna (short piece of hookup wire) but it seems to work fine without
> it at shorter distances. The transmitter can have an antenna added if
> you need, but it comes with a loop on the PC board that does the trick
> for most applications. No components required though.
>
> -Stuart Leslie
>
Thanks so much for your help I'll be ordering those boards this evening.
Look forward to getting up and running.
Cheers,
Will Pollock
Steven Frankel
$21.95 and is a receiver with a decoder, the TXE-433 is $19.95 and is a
transmitter with encoder. They also have the same ones without the
encoder/decoders: RX-433 for $16.95 and TX-433 for $14.95. I couldn't find
the boards on their website though.news:1geA5.940$WD4....@newsread2.prod.itd.earthlink.net...
ring...@my-deja.com
Ringo
In article <z_lA5.16013$u6.6...@typhoon1.ba-dsg.net>,
"Steven Frankel" <TSFr...@hotmail.com> wrote:
> I just saw some boards in a Ramsey Electronics catalog: The RXD-
433 is
> $21.95 and is a receiver with a decoder, the TXE-433 is $19.95 and is
a
> transmitter with encoder. They also have the same ones without the
> encoder/decoders: RX-433 for $16.95 and TX-433 for $14.95. I couldn't
find
> the boards on their website though.
> "William Pollock" <cry...@earthlink.net> wrote in message
> news:1geA5.940$WD4....@newsread2.prod.itd.earthlink.net...
> >
Sent via Deja.com http://www.deja.com/
Before you buy.
Steven Frankel
<ring...@my-deja.com> wrote in message news:8qsuql$t0g$1...@nnrp1.deja.com...
> What is the range and max baud rate for teh Ramsey radios?
> Ringo
>
>
>
> In article <z_lA5.16013$u6.6...@typhoon1.ba-dsg.net>,
> "Steven Frankel" <TSFr...@hotmail.com> wrote:
> > I just saw some boards in a Ramsey Electronics catalog: The RXD-
> 433 is
> > $21.95 and is a receiver with a decoder, the TXE-433 is $19.95 and is
> a
> > transmitter with encoder. They also have the same ones without the
> > encoder/decoders: RX-433 for $16.95 and TX-433 for $14.95. I couldn't
> find
> > the boards on their website though.
> > "William Pollock" <cry...@earthlink.net> wrote in message
> > news:1geA5.940$WD4....@newsread2.prod.itd.earthlink.net...
> > >
Stuart Leslie
For what it's worth, I just got mine working at 2400 baud and traveled from the
attic to the bottom floor and then outside my house in the yard with the data
coming through consistently throughout the trip. I am impressed with these
things (TX-99 RX-99)! I have each connected to an AT90S2313 (AVR) and am using
BascomAVR to write the code.
Stuart Leslie
Mariusz Zaczek
www.linxtechnologies.com/f_modules.html has
great simple RF transmitter and receivers ... for under $30 each.
They are very very simple to use!!
Mario
( NREMT-B ) Emergency Medical Technician - B
NEW PROJECTS PAGE: http://atlantis.aae.uiuc.edu/~astro
_____
/ | Graduate Student in Aero/Astro Eng. at the
.__./''''''| University of Illinois in Urbana/Champaign
._____________/ |/^^^^^^^\ *** Center for the Simulation of ***
| Zaczek, `==="\_______/ *** Advanced Rockets ***
`. Mariusz .___/^^^^^^^^\
`------------'~~~\________/ Office: 322D Talbot Lab
`........\ Urbana, IL 61801
`-------' (217) 333-4434
http://www.students.uiuc.edu/~zaczek
Steven LaPha Jr.
They have a product line of RF trancievers mostly 900 MHz. I was wondering if
these could be used like the daughter cards (with some additions of course like
capacitors and stuff) they include a data sheet.
I'm new to all this RF stuff but would like to use something like the LINX
chips. Basically looking at my options to see what's available. Linx has a
data sheet on hot to easily connect it with a RS232 interface I believe with
like no extra equipment, except an antenna maybe.
If anyone has any more info on those maxim chips let me know, thanks.
Steven LaPha Jr.
Steven Frankel
order. You can also get the Linx modules at www.rfdigital.com.
"Mariusz Zaczek" <zac...@cassini.aae.uiuc.edu> wrote in message
news:Pine.HPX.4.21.00092...@cassini.aae.uiuc.edu...
Mike Rosing
Unless you're an RF engineer, don't buy chips! frequencies above 100MHz
require a lot of black magic, in board layout, in parts selection and in
soldering technique. Get the eval boards instead, these have all the
basic problems solved to make the chips work well.
Maxim parts are aimed at cell phone applications. I haven't looked at the
LINX chips. If you can get an eval board, and all you have to do is attach
a signal, it might be a far simpler way to go.
good luck!
Patience, persistence, truth,
Dr. mike
Gerry Schneider
Mike Rosing wrote:
> Unless you're an RF engineer, don't buy chips! frequencies above 100MHz
> require a lot of black magic, in board layout, in parts selection and in
> soldering technique. Get the eval boards instead, these have all the
> basic problems solved to make the chips work well.
>
> Maxim parts are aimed at cell phone applications. I haven't looked at the
> LINX chips. If you can get an eval board, and all you have to do is attach
> a signal, it might be a far simpler way to go.
>
Good point about the eval boards. Linx makes you buy a Tx and Rx eval board set
before they'll sell you the "chips" (actually fully functional tiny modules). As an
old RF engineer, I first sneered, figuring it was just another way to make a quick
buck, but after about the 3rd mysterious problem was solved by referring back to the
boards, I completely changed my mind. Definitely good to have a known working system
when you're messing around. BTW, the Linx boards come with Holtek encoders,
professional antennas, a regulated battery power supply, and a breadboard section -
high quality and well worth the money.
Gerry
Mariusz Zaczek
Yes, Lynx does make you buy the boards which is unfortunate.
But if you buy just the chips from the place mentioned in
a previous posting you can do well without the boards.
I had no problem in using just the chips....I was sending
serial data to one pin of the transmitter and was able to receive the same
data on the receiver. Granted distance was significantly less then
what they said it would be....but I did nothing special. Considering
I'm not an electrical engineer rather only a astronautical engineer
I thought it was still easy.
One thing I do suggest though is to have error checking. I used
my chips to make an RC car controller and I used simple checksum
error checking...ie. I calculated the checksum of the bytes of
data I was to send and then I sent the data and the checksum byte
together....the receiver would then use the checksum it received
to double check the data. You can see my code (assembly) at this
page:
http://atlantis.aae.uiuc.edu/~astro/2000_eoh_car_project.html
Mario